Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc Packet Interface of CT3258 Version:1.0 Date: 2015/01/14 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 2 Change History Version Date Change Descriptions Author 1.0 2015/01/14 Initial version Hao Ye Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 3 Contents: Packet Interface of CT3258 1  Change History 2  1  Packet Interface Descriptions 7  1.1  Packet Format 7  1.1.1  START_BYTES 7  1.1.2  LENGTH 7  1.1.3  TYPE 7  1.1.4  Packet Fields 9  1.1.5  Parity Field 9  1.1.6  Time Out 10  1.2  Field Formats 10  1.2.1  CHAN_D 14  1.2.2  VOCODER_CMODE 14  1.2.3  AFC_CONFIG 15  1.2.4  COMPANDER_CONFIG 16  1.2.5  VOCODE_TONE 17  1.2.6  ANALOG_FEATURE 19  1.2.7  VOCOER_SEL 19  1.2.8  VOCODER_INI 20  1.2.9  CHIP_RESET 20  1.2.10  CHIP_LOWPWR 20  1.2.11  PARITY_ENABLE 21  1.2.12  ACK_MESSAGE 21  1.2.13  WORK_MODE 22  1.2.14  CARRIER_READY 23  1.2.15  PROCESS_MODE 24  1.2.16  NEW_EVENT 25  1.2.17  DEMOD_GAIN 26  1.2.18  REPORT_FIELD 26  1.2.19  BER_REPORT 27  1.2.20  ANALOG_TONE 27  1.2.21  CALL_START 28  1.2.22  CALL_STOP 30  1.2.23  CONNECT 30  1.2.24  DISCONNECT 30  1.2.25  DPMR_ACK 31  1.2.26  SYSTEM_INFO 31  1.2.27  ANALOG_SUBAUDIO 32  1.2.28  CALL_MATCH 41  1.2.29  ADDRESSING_MODE 41  1.2.30  GROUP_ID 42  1.2.31  SCRAMBLER_SEED 43  Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 4 1.2.32  MOD_GAIN 43  1.2.33  CODEC_SELECT 44  1.2.34  SET_I2C_ADDRESS 44  1.2.35  SYNC_MISS_COUNT 44  1.2.36  Q_PRO_STR 45  1.2.37  Q_HW_VER 45  1.2.38  Q_SW_VER 45  1.2.39  Q_CID_SN 46  1.2.40  DMR_GROUP_ID 46  1.2.41  DC_OFFSET 47  1.2.42  ANALOG_CONFIG 48  1.2.43  CTC_PARAM 50  1.2.44  VOCOER_IO_SET 52  1.2.45  MODOUT_CONFIG 53  1.2.46  IQCOMP_COEF 53  1.2.47  DIGC_DATA_FRAME 55  1.2.48  DPMR_PREAMBLE_LENGTH 61  1.2.49  DPMR_CALL_OPTION 61  1.2.50  DPMR_END_UE 62  1.2.51  DIGC_FS1 63  1.2.52  DIGC_CALLED_ID_BIN 63  1.2.53  DIGC_OWN_ID_BIN 63  1.2.54  DPMR_CALLED_ID_BCD 64  1.2.55  DPMR_OWN_ID_BCD 64  1.2.56  DPMR_M_V_F_E 64  1.2.57  DPMR_PROTOCOL_OPTION 65  1.2.58  DPMR_SLD 65  1.2.59  DPMR_HT_CI_PM 66  1.2.60  DPMR_CI 71  1.2.61  DPMR_CC 71  1.2.62  DPMR_SEND_SF 72  1.2.63  DPMR_SEND_HEADER 72  1.2.64  DPMR_SEND_END 72  1.2.65  DPMR_SEND_AD 72  1.2.66  DIGI_MIC_GAIN 73  1.2.67  DIGI_SPEAKER_GAIN 73  1.2.68  I2C_OPERATION 73  1.2.69  MISC_GAIN 74  1.2.70  SQ_LEVEL 75  1.2.71  SPI_OPERATION 78  1.2.72  DMR_SLC 78  1.2.73  DMR_CALL_SLOT 79  1.2.74  EQULIZER_FILTER 79  1.2.75  DMR_FLC 80  Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 5 1.2.76  DMR_CC 81  1.2.77  DMR_CALL_START 81  1.2.78  DMR_CALL_OPTION 82  1.2.79  DMR_OFFSET 83  1.2.80  DMR_SLOT_TYPE 84  1.2.81  DMR_EMB 84  1.2.82  DMR_CALLED_ID_BCD 85  1.2.83  DMR_OWN_ID_BCD 85  1.2.84  DMR_SLOT_FOUND 85  2  Application Guides 87  2.1  Code Downloading 87  2.1.1  Boot loader Downloading 87  2.1.2  Application Downloading 87  2.2  DPMR Call Processing 87  2.2.1  Easy Mode 88  2.2.2  DPMR Layer 2 Mode 90  2.3  DMR Call Processing 92  2.3.1  DMR Easy Mode 92  2.3.2  DMR Layer 2 Mode 92  2.3.3  DMR MS Call Flow 93  2.3.4  Base Station Activation 94  2.3.5  Listen Before Transmitting 94  2.4  Typical Call Sessions with CT3258 in DPMR Mode 96  2.4.1  Digital Voice Call 96  2.4.2  Voice Call with Slow Data 97  2.4.3  Voice Call Recording 97  2.4.4  Voice Call Play Back 98  2.4.5  Data Call with Type 1 or Type 2 Data 99  2.4.6  Voice Call with Appended Data 99  2.4.7  Data Call Type 3 (for future release) 100  2.4.8  Short Appended Data (TS 102 658 Only) 102  2.4.9  Analog Voice Call in DPMR Mode 102  2.4.10  Handling of Maintenance Message (TS 102 658 Only) 103  2.4.11  Automatic Analog and DPMR Call Detection 103  2.4.12  Audio Muting for Un-matched Calls 104  2.5  Typical Call Sessions with CT3258 in DMR Mode 104  2.5.1  DMR Voice Call in DMR Easy Mode 104  2.5.2  DMR Voice Call in DMR Layer 2 Mode 107  2.5.3  Analog Voice Call in DMR Mode 110  2.6  Gain Calibration 111  2.7  DC and IQ Calibration 112  2.8  Error Handling 118  2.9  DPMR Standard User Interface 118  2.9.1  Message Used for Standard User Interface 119  Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 6 2.10  DMR Number and Dialing Plan 121  2.10.1  Message Used for DMR Dialing Plan 122  2.11  Power Saving Mode 123  2.12  Codec Selection 124  2.13  Codec Configurations 124  2.14  Debug Mode 125  2.14.1  Setting Up Two Point Modulation 125  2.14.2  BER Test 125  2.14.3  Loop Back 125  Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 7 1 Packet Interface Descriptions Packet interface is defined above the physical interface (HPI, Serial Port) for communications between CT3258 and the host MCU. The packet format is identical regardless of physical interfaces. As HPI in CT3258 is preconfigured to use 16 bit format, the total number of bytes in a packet should be even. If the total number of byte is odd, a zero is appended at the end. This appended zero will not be counted in the LENGTH field. 1.1 Packet Format The packet format is as shown in the table below. A packet consists of a packet header and number of packet fields and optional parity bytes. A packet header starts with 3 bytes of START_BYTES. The next two bytes contain the packet LENGTH and the next byte contains the TYPE. Each packet contains one or more fields which are shown as FIELD (0) through FILELD (N-1). Optionally, at the end of the packet, there are two parity bytes. Packet Header Field Parity START_BYTES LENGTH TYPE FIELD(0) ... FIELD(N-1) FBYTE PARITY_BYTE 3 byte 2 byte 1 byte Variable Variable 1 byte 1 byte Table 1-1 General Packet Format Packet details are described in the sections below. 1.1.1 START_BYTES The three bytes of START_BYTES always have fixed values of 0x84, 0xA9, 0x61. 1.1.2 LENGTH The PACKET LENGTH occupies two bytes of the packet. The MS byte of the packet length is the fourth byte of the packet and the LS byte of the packet length is the fifth byte of the packet. The PACKET LENGTH is the sum of each FIELD. Note that PACKET LENGTH excludes the first 6 bytes taken up by the Packet Header. If parity check is enabled, the length field includes the parity byte as well. As HPI in CT3258 is preconfigured to use 16 bit format, the total number of bytes in a packet should be even. If the total number of byte is odd, a zero is appended at the end. This appended zero will not be counted in the LENGTH field. 1.1.3 TYPE TYPE field specifies the destination, read/write property and the types of the packet. It includes Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 8 multiple fields, described in the table below: Bit Position Field Descriptions 7 AMBE bypass External Vocoder message bypass 0: CT3258 Control 1: AMBE control 6 Codec bypass Codec message bypass 0: CT3258 Control 1: Codec control, any bytes after packet type are send to codec directly 5 Read/Write Read Write Control 0: Write. The MCU write fields to CT3258 1: Read. CT3258 report fields to the MCU. Not all parameters are readable. 4 Near/Far Near end / Far end control 0: Near end 1: Far End 3-0 Packet Type See Table Below Table 1-2 Fields in TYPE Byte Internally, the call related information is stored in registers in CT3258. External MCU can write to and read from these registers through packet interface. The write/read control is through bit 5 of TYPE field. Not all registers are readable. Column 6 of Table 1-5 describes whether a register is readable or not. Some fields, such as Own ID, Called ID, have two sets of internal registers, for far end and near end of calls. When writing a packet field, the content is always stored in the near end registers. When reading field information, the MCU can request the near end information or the far end information. The near end information is the information that is to be sent or already sent to the far end. The far end information is the information that is received from the far end. The near/far end control is through bit 4 of the TYPE byte. For example, station A has an Own ID 1234567, station B has an Own ID of 1234563. The user (MCU) can set the Own ID for the two stations with field DPMR_OWN_ID_BCD, and with write flag. The user can then read back the Own ID of each station with read flag, and near end flag at the two stations. After a call is made from A to B, the user can read the Own ID of station A by issuing read command to station B with far end flag. Column 6 of Table 1-5 also describes whether far end register is available for reading. The details of Packet Type are described in Table 1-3 below. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 9 Type Value Packet Name Descriptions 0 Control Packets Used to set up chip operation mode, configure hardware, set up or end a call. When a control packet is received, the chip returns a control packet with response fields that contain response data or indication of errors in the control packet. 3 DPMR Packet Used for DPMR protocol specific information. User can use these messages to change the elements of DPMR protocol. 4 Program packet Used for host MCU to program CT3258. 5 DMR Used for DMR protocol specific information. User can use these messages to change the elements of DMR protocol. Others Reserved Reserved Table 1-3 Packet Types Note that the boot loader for DPMR mode and DMR mode is different. Depending on the boot loader types, CT3258 enters DPMR mode or DMR mode. In DPMR mode, commands for DMR only (type 5) are not recognized. In DMR mode, command for DPMR only (type 3) are not recognized. Also note that for program packet only (type 4), the packet header and parity bytes can be omitted. In that case, the boot loader searches for a match of the field and command code. 1.1.4 Packet Fields The packet fields contain useful packet information. Various different packet fields each with their own format are defined in the next section, however, the general format of a field is shown in the table below. A field consists of a field identifier followed by field data. The length of field data is dependent upon the field identifier. Many fields have fixed lengths. Some fields are variable in length; and in such cases the length of the field data is embedded inside field data explicitly or implicitly. Field Identifier Field Data 1 byte L(n)-1 bytes Table 1-4 General Field Format 1.1.5 Parity Field The parity field is a 2-byte field at the end of a packet. The first byte of the parity field is the parity field identifier and is always equal to 0x2f. The second byte of the parity field is the parity byte. It is obtained by “Exclusive-oring” every byte in the packet, except for the START_BYTES and the parity byte (last byte), together. CT3258 checks the parity byte for all received packets, informs the MCU of any parity error, and discards any packet that has an incorrect parity byte. When Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 10 parity check fails, the receiver replies with a packet (with field 0x17) indicating parity failure. Parity check is disabled at reset. It can be enabled when CT3258 receives a control packet with PARITY_ENABLE field. 1.1.6 Time Out If a valid message is received, CT3258 responds to MCU in 40 milliseconds (except some especial commands in the table ). If a response packet is not received within 40 milliseconds, the MCU can consider the message lost and resend the packet if necessary. When a response packet is received, the MCU or CT3258 does not send an ACK to the response packet. Commands Response time CHAN_D 80ms VOCOER_SEL 1-3s CODEC_SELECT 1 s DIGC_DATA_FRAME 80ms. The response time of the first data is header frame(80ms) + Preamble + Silence ACK_MESSAGE The response time of receiving 17 0A after finishing sending is about 400ms. We have to wait the 17 0A to do the subsequent operation. 1.2 Field Formats A packet must contain one or more fields. The field formats are different for different types of packets. Each packet requires a response packet. Control packets can be used to configure the chip prior to operation and also to query for information from the chip. The response packet for must fields just echoes back the control field identifier followed by a 0x00 byte to indicate the control field was received successfully. If multiple fields are present in the packets, the response packet only needs to echo the last field of the packet. DPMR / DMR packets contain the call information. They can be originated either from host or from CT3258. The response packets to DPMR / DMR packet echoes back the control field identifier followed by a 0x00 byte to indicate the field was received successfully. If multiple fields are present in the packets, the response packet only needs to echo the last field of the packet. The Program Packet is used by the host to down load application program to CT3258. The response packet to Program Packet echoes back the control field identifier followed by a 0x00 byte to indicate the field was received successfully. Either the MCU or CT3258 can initiate a packet exchange. The packet can be used to write information to the other end (CT3258 or MCU), or it can be used to request information from the Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 11 other end. The Read/Write control is by bit 5 of the TYPE byte. When requesting field information, the MCU can request near the end information or the far end information. The near end information is the information that is to be sent or already sent to the far end. The far end information is the information that is received from the far end. The near/far end control is through bit 4 of the TYPE byte. The table below summarizes various fields used in CT3258. Field Name Field Identifie r Pac ket Typ e Contro l Field Length (Bytes) Respon se Field Length (Bytes) Note Descriptions CHAN_D 0x01 0 Varies 2 YP Encoded voice data VOCODER_CMODE 0x02 0 2 2 N Vocoder mode flags for current vocoder AFC_CONFIG 0x05 0 3 2 YR COMPANDER_CONFI G 0x06 0 8 2 N Compander Configuration VOCODE_TONE 0x08 0 Varies 2 Y Force current encoder/decoder to generate tone frames ANALOG_FEATURE 0x0A 0 3 2 N Analog Feature configuration VOCOER_SEL 0x10 0 2 2 N Vocoder Selection VOCODER_INI 0x12 0 2 2 N Vocoder initialization CHIP_RESET 0x14 0 1 2 N Chip reset CHIP_LOWPWR 0x15 0 2 2 N Set chip to low power mode PARITY_ENABLE 0x16 0 2 2 N Enable parity check ACK_MESSAGE 0x17 0 None 2 N Message error report WORK_MODE 0x18 0 4 2 Y Set up CT3258 work mode CARRIER_READY 0x19 0 2 2 N Carrier Ready Message PROCESS_MODE 0x1A 0 2 2 N Process Mode NEW_EVENT 0x1B 0 None 2 YX New event indication DEMOD_GAIN 0x1C 0 3 2 Y Demodulator Gain REPORT_FIELD 0x1D 0 2 2 NX Fields to report when receiving calls. BER_REPORT 0x1E 0 2 10 Y Bit error rate test report ANALOG_TONE 0x1F 0 18 2 N Generate Local Tone CALL_START 0x20 0 2 2 N Start call send CALL_STOP 0x21 0 1 2 N Stop call send CONNECT 0x22 0 2 2 NP Send connection DISCONNECT 0x23 0 2 2 NP Send disconnection DPMR_ACK 0x24 0 2 2 NP Send ack SYSTEM_INFO 0x25 0 2 2 NP Send system or status Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 12 information ANALOG_SUBAUDI O 0x26 0 Varies 2 N analog subaudio CALL_MATCH 0x27 0 None 2 N Call match report ADDRESSING_MODE 0x28 3 2 2 NP Dialing mask length GROUP_ID 0x29 3 5 2 YP Group ID number SCRAMBLER_SEED 0x2A 0 Varies 2 NP Scrambler seed MOD_GAIN 0x2C 0 3 2 N Modulator Gain CODEC_SELECT 0x2D 0 2 2 N Codec Selection SET_I2C_ADDRESS 0x2E 0 2 2 N Set the I2C address for the codec SYNC_MISS_CNT 0x2F 0 2 2 N Set the number of Sync miss before reporting Q_PRO_STR 0x30 0 1 Varies Y Query for product code Q_HW_VER 0x31 0 1 Varies Y Query for hardware version Q_SW_VER 0x32 0 1 Varies Y Query for software version Q_CID_SN 0x33 0 1 9 Y Query for customer ID DMR_GROUP_ID 0x36 5 6 2 YD Group ID number DC_OFFSET 0x39 0 13 2 N DC Offset ANALOG_CONFIG 0x3c 0 12 2 N Analog Configuration VOCODER_IO_SET 0x3e 0 2 2 NP Vocoder IO settings CTC_PARAM 0x3d 0 23 2 N CTC detection parameters MODOUT_CONFIG 0x41 0 6 2 N Two point modulation delay IQCOMP_COEF 0x42 0 10 2 YR IQ compensation configuration DIGC_DATA_FRAME 0x43 0,3, 5 Varies 2 YFX Data frames DPMR_PREAMBLE_L ENGTH 0x46 0,3 3 N N Preamble and silence length DPMR_CALL_OPTIO N 0x47 3 6 2 N DPMR Call Option DPMR_END_UE 0x4B 3 4 2 YF 17-bit un-encoded END DIGC_FS1 0x4C 3 7 2 YF 48-bit of FS1 DIGC_CALLED_ID _BIN 0x50 3, 5 4 2 YF 24-bit called ID in binary DIGC_OWN_ID_BIN 0x51 3, 5 4 2 YF 24-bit own ID in binary DPMR_CALLED_ID _BCD 0x52 3 5 2 YFP 7 digit called ID in BCD DPMR_OWN_ID _BCD 0x53 3 5 2 YFP 7 digit own ID in BCD DPMR_M_V_F_E 0x54 3 2 2 YFP 3-bit communication mode and 4-bit communication format DPMR_PROTOCOL_O PTION 0x55 3 2 2 NP DPMR protocol option Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 13 DPMR_SLD 0x56 3 4 2 YFP 18-bit slow data DPMR_HT_CI_PM 0x57 3 3 2 YFP 4-bit header type and 11-bit call information DPMR_CI 0x5A 3 3 2 FP 11-bit call information DPMR_CC 0x5C 3 4 2 YFP 24-bit of color code (Di-bit) DPMR_SEND_SF 0x5F 3 1 2 NP Send super frame command. Upon receiving this command, CT3258 assemble a super frame and send to the far end DPMR_SEND_HEAD ER 0x60 3 1 2 NP Send header frame command. Upon receiving this command, CT3258 assemble a header frame and send to the far end DPMR_SEND_END 0x61 3 1 2 NP Send end frame command. Upon receiving this command, CT3258 assemble a end frame and send to the far end DPMR_SEND_AD 0x62 3 1 2 NP Send appended data DIGI_MIC_GAIN 0x68 0 3 2 N Digital Microphone Gain DIGI_SPEAKER_GAI N 0x69 0 3 2 N Digital Speaker Gain I2C_OPERATION 0x6A 0 Varies 5 Y I2C Read and Write MISC_GAIN 0x6B 0 13 2 N Misc. Gains SQ_LEVEL 0x6C 0 13 2 YR RSSI and OOBE levels SPI_OPERATION 0x6D 0 3 2 YR SPI Write Operation DMR_SLC 0x6E 5 5 2 ND DMR SLC report DMR_CALL_SLOT 0x6F 5 2 2 ND DMR call slot information EQUALIZER_FILTER 0x70 0 12 2 N Set coefficients for audio equalizer DMR_FLC 0x76 5 4 2 YD DMR Full LC DMR_CC 0x77 5 2 2 YD DMR Color Code DMR_CALL_START 0x78 5 4 2 ND DMR Call Start DMR_CALL_OPTION 0x79 5 6 2 ND DMR Call option DMR_OFFSET 0x7A 5 9 2 ND DMR Slot Timing Offset DMR_SLOT_TYPE 0x7B 5 2 2 ND DMR slot type DMR_EMB 0x7C 5 2 2 ND DMR EMB field DMR_CALLED_ID_B CD 0x7D 5 5 2 YFD 8 digit called ID in BCD DMR_OWN_ID_BCD 0x7E 5 5 2 YFD 8 digit called ID in BCD DMR_SLOT_FOUND 0x7F 5 2 2 ND DMR_slot found Table 1-5 Overview of Packet Fields In the note field in the above table, Y means the command can be used as both WRITE and READ Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 14 command; N means the command can only be used as a WRITE command. F means the command can be used to read both Far End information and Near End information. R means the command is used only when paired with SCT3700. D means command can be used for DMR only. P means command can be used for DPMR only. X means command is interpreted differently for DMR and DPMR. As most fields are used as commands to CT3258 for controlling and configuration purposes, we sometimes call field as command. As a result we use the terms field and command in-discriminatively throughout the document. The detailed descriptions of each filed is described in the following sections. Only field format in Write Packet is shown. Read Packets usually only have the field ID byte. 1.2.1 CHAN_D This field can be used to pass encoded voice data between the MCU and CT3258. This command is only used in DPMR mode. Field Identifier Data Length Vocoder Configuration field 1 Byte 1 Byte 1 Bytes 0x01 The length of the data in bytes Encoded voice data. 36 bytes per 80 milliseconds. Default: 36 Table 1-6 CHAN_D Field Format 1.2.2 VOCODER_CMODE This field can be used to change the mode of the vocoder. Field Identifier Vocoder Configuration field 1 Byte 1 Bytes 0x02 { AMBE_COMP, 0, 0, 0, NS, 0, TD, AGC} Default: 0x08 Table 1-7 VOCODER_CMODE Field Format The meaning of each bit is given below: Bit Name Descriptions Default AMBE_ COMP AMBE vocoder compatibility bit 0 NS Noise Suppression Enable 0: disable 1 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 15 1: enable Reserved Reserved 0 TD Tone Detection Enable 0: disable 1: enable 0 AGC AGC Enable 0: disable 1: enable 0 Table 1-8 VOCODER_CMODE Field Options 1.2.3 AFC_CONFIG This command is used to configure AFC (automatic frequency control), when used with SCT3700. If the receiver carrier frequency is not matched to the transmitter carrier frequency, the performance degrade. The use the AFC, the user first use this command to read the frequency offset between the transmitter and the receiver. To compensate for the frequency offset, the user has two options: 1. Change SCT3700 receiver LO, using SCT3700 frequency configuration command. 2. Change the internal mixer inside CT3258, using this command. The AFC_CONFIG write command has the following format: Field Identifier Internal frequency offset 1 Byte 1 Bytes 0x05 Internal frequency offset applied at the CT3258 mixer. The unit is Hz Default: 0 Table 1-9 AFC_CONFIG Field Format AFC_CONFIG command is also used to read the frequency offset between the receiver and the transmitter. To read the frequency offset, AFC_CONFIG command should be sent with “Read/Write” bit in the TYPE field set to 1. The AFC_CONFIG command used in “read” mode has the following format: Field Identifier DC Time Constant 1 Byte 1 Byte 0x05 Time constant for averaging AFC frequency offset Default 3 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 16 Time constant of 0 corresponds to average time of 31.25 ms, which is the time it takes to reach within 10% of the steady state energy value. If the constant is n, the average time is given by the following formula: T = 31.25 * 2^n. The Response to the read AFC_CONFIG command has the following format: Field Identifier Frequency offset Reserved 1 Byte 1 Byte 1 Bytes 0x05 Frequency offset between the transmitter and the receiver, in Hz Reserved Default - - 1.2.4 COMPANDER_CONFIG This command is used to configure the compander in analog call mode. The configurable parameters include compander reference level for the transmitter and the receiver, the energy estimation timing constant, and the compander gain update interval. The compander energy level is calculated as the running average of the absolute values of received audio signal, given by the equation below: E(n) = (1-alpha) * E(n-1) + alpha * |x(n)|, where |x(n)| is the absolute value of the received audio signal, alpha is the time constant. The smaller is the alpha, the larger is the time constant. Roughly, T = 4 / alpha, where T is the time it takes to reach within 10% of the steady state energy value. For example, with the default alpha = 68, the time constant is T = 4 / 68 = 60 ms. The TX and RX compander reference levels are the signal levels that the input signal are compared against. At the TX side, if the input signal energy level is greater than the TX compander reference level, the input signal are reduced; if it is less than the TX compander reference level, it is enlarged. At the RX side, if the input signal energy level is greater than the RX compander reference level, the input signal are enlarged; if it is less than the RX compander reference level, it is reduced. The compander gain update interval is the interval that the compander gains are re-calculated. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 17 Within the interval, the compander gain is unchanged. The compander gain update interval is in terms of 24 kHz samples. Field Identifier Compander Update interval Compander TX reference Comander RX reference Compander Energy Constant 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 0x06 Compander update interveral in terms of 24 samples Compander TX reference, 0-32768 Compander RX reference, 0-32768 Compander Energy update constant, 0-16384 Default 60 2048 2048 68 Table 1-10 COMPANDER_CONFIG Field Format 1.2.5 VOCODE_TONE This field is used to force the encoder to transmit a tone frame. The frequency (or frequencies) and amplitude of the tone are specified by this field. It is also used to report the detected DTMF tone or single tone to the MCU. Field Identifier Tone Configuration Tone Data Amplitude Data 16 bit Frequency 1 Byte 1 Byte 1 Byte 1 Byte 2 Bytes (Optional) 0x08 See Table 1-10 for details See Table 1-12 for details Amplitude scale in dB +3dB to -90 dB Single tone Frequency in 16 bit decimal Default 0 0x80 -10 dB (0xF6) 0 Table 1-11 VOCODE_TONE Field Format The details of Tone Configuration byte is as follows: Bit Position Descriptions Default Bit 7-3 Reserved 0 2 Optional 16 bit frequency field flag 0: No 16 bit frequency field 1: 16 bit frequency field present 0 1 Tone Direction 0: Send or detect near end Vocoder tone 1: Send or detect far end Vocoder tone 0 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 18 0 Tone on / off flag 0: Tone Off 1: Tone On 0 Table 1-12 Tone Configuration Details DTMF Tone Data Tone Type Frequency 1 (Hz) Frequency 2 (Hz) 0-4 Invalid Tone NA NA 0x05-0x7A Single Tone Tone Data * 31.25 Hz NA 0x7B-0x7F Invalid tone NA NA 0x80 DTMF “0” 1336 941 0x81 DTMF “1” 1209 697 0x82 DTMF “2” 1336 697 0x83 DTMF “3” 1477 697 0x84 DTMF “4” 1209 770 0x85 DTMF “5” 1336 770 0x86 DTMF “6” 1477 770 0x87 DTMF “7” 1209 852 0x88 DTMF “8” 1336 852 0x89 DTMF “9” 1477 852 0x8a DTMF “A” 1633 697 0x8b DTMF “B” 1633 770 0x8c DTMF “C” 1633 852 0x8d DTMF “D” 1633 951 0x8e DTMF “*” 1209 941 0x8f DTMF “#” 1477 941 0x90 KNOX “0” 1162 820 0x91 KNOX “1” 1052 606 0x92 KNOX “2” 1162 606 0x93 KNOX “3” 1279 606 0x94 KNOX “4” 1052 672 0x95 KNOX “5” 1162 672 0x96 KNOX “6” 1279 672 0x97 KNOX “7” 1052 743 0x98 KNOX “8” 1162 743 0x99 KNOX “9” 1279 743 0x9a KNOX “A” 1430 606 0x9b KNOX “B” 1430 672 0x9c KNOX “C” 1430 743 0x9d KNOX “D” 1430 820 0x9e KNOX “*” 1052 820 0x9f KNOX “#” 1279 820 0xa0 Dial Tone 440 350 0xa1 Ring tone 480 440 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 19 0xa2 Busy Tone 620 480 0xa3 Call Progress Tone 490 350 0xa4-0xff Inactive NA NA Table 1-13 VOCODE_TONE Field Options Note that the bytes for 16 bit Frequency is optional. It is present only if bit 2 of Tone Configuration Byte is 1. 1.2.6 ANALOG_FEATURE This field configures for special feature. Note that these special feature can only be used when the analog vocoder (ID = 16) is loaded. Field Identifier ANALOG_FEATURE 1 Byte 2 Bytes 0x010 Bit 0: DTMF enable flag 0: DTMF detection is disabled 1: DTMF detection is enabled Bit 1: DTMF detection position 0: DTMF detection is done before the de-emphasis filter 1: DTMF detection is done after the de-emphasis filter Bit 2: MSK enable flag 0: MSK transmission and detection disabled 1: MSK transmission and detection is enabled. Bit 3: Compander enable flag 0: Compander is disabled 1: Compander is enabled. Bit 4-15: reserved. Default 3 Table 1-14 ANALOG_FEATURE Field Format 1.2.7 VOCOER_SEL This field forces vocoder type. CT3258 supports AMBE+2 vocoder from DVSI. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 20 Field Identifier Vocoder Type 1 Byte 1 Byte 0x010 4: AMBE+2 16: Analog calls Others, reserved Default 4 Table 1-15 VOCODER_SEL Field Format 1.2.8 VOCODER_INI This command initializes the vocoder. Field Identifier Initialization type 1 Byte 1 Byte 0x012 N/A Default 0 Table 1-16 VOCODER_INI Field Format 1.2.9 CHIP_RESET This command resets CT3258. This command has the effect as NMI signal (non-maskable interrupt), which restarting the firmware in CT3258 without reloading the firmware. Field Identifier 1 Byte 0x14 Table 1-17 CHIP_RESET Field Format 1.2.10 CHIP_LOWPWR This command puts CT3258 in low power mode. Field Identifier Low Power Mode 1 Byte 1 byte 0x015 Bit 7:6, Reserved Bit 5: Power down external vocoder Bit 4: Power down external codec Bit 3:0: Power mode of CT3258 0: Normal 1: Stop TX and RX processing 2: Reserved Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 21 Table 1-18 CHIP_LOWPWR Field Format 1.2.11 PARITY_ENABLE This command enables parity checks on all packets: Field Identifier Parity Enable/Disable 1 Byte 1 Byte 0x016 0: Disable parity checks 1: Enable parity checks Default 0 Table 1-19 PARITY_ENABLE Field Format Note that unlike other fields, PARITY_ENABLE field can only be the only field in a packet. 1.2.12 ACK_MESSAGE This is a response packet to a received packet, when packet is not received correctly, and the packet field is not recognizable or unreliable. Note that when received field is recognizable reliably even though there is error in the packet, CT3258 respond with the command field instead of ACK_MESSAGE field. Note that 0x17 0x0A does not indicate an error condition. This is sent when CT3258 has completely sent the message to be sent to the far end. 3: Power down certain peripheral of CT3258 including serial port, DMA and timers. 4: CT3258 enters IDLE mode 5: CT3258 enters Sleep mode 6: CT3258 enters Halt mode Default 0 Field Identifier Failure Code 1 Byte 1 Byte 0x017 0: No error 1: Response to system reset. CT3258 is ready to receive command from the host. 2: Field length exceeds maximum allowed 3: Parity error 4: Unknown command error 5: Packet length does not match with field Length 6: Error in processing field Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 22 Table 1-20 PACKET_FAILURE Field Format 1.2.13 WORK_MODE This command set the work mode for CT3258. Table 1-21 WORK MODE Field Format Bit Position Descriptions 7 Two Point Modulation Disable Flag 0: Enable two point modulation in TX mode 1: Disable two point modulation in TX mode 6 Special SCT3700 calibration loop enable 0: Normal mode 1: Enable the special SCT3700 calibration loop 5-4 Reserved 3-0 Work Mode 7: I2C write error 8: SLD request time out error 9: TCH request time out error 10. Message to far end completion indication 11. Error in processing called ID or own ID 12. Chip not activated 13. Unsupported feature 14. Function not loaded 15. Odd byte error Others: reserved Default 0 Field Identifier Work Mode Modem Loop Mode Audio Loop Back Debug Mode 1 Byte 1 Byte 1/2 Byte [7:4] 1/2 Byte [3:0] 1 Byte 0x018 See Table 1-19 for details. 0: No Loop 1: Codec Loop back 2: 4 FSK Loop back 3: Packet Loop back 4: FEC Loop back 5: Vocoder Loop back 6: Decimator Loop back Others: reserved 0: No Loop 1: Codec Loop back 2: Decimator Loop back 3: Vocoder Loop back 4: FEC Loop back 5: Packet Loop back 6: 4 FSK Loop back Others: reserved See Table 1-20 for details Default 0 0 0 0 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 23 0: Idle 1: RX 2: TX 3: Full Duplex Table 1-22 Details of Work Mode Byte Byte Value Descriptions 0 No debug 1 Mod port send fixed sine wave of 1000 Hz 2 Mod port send 4 FSK signal with FS1 pattern 3 Reserved 4 Reserved 5 BER Test mode 6 Reserved 7 Reserved 8 Reserved 9 TX sends 1031 Hz test Tone instead Voice from microphone 10 TX sends silence instead Voice from microphone 11 DMR BER test mode (STD ID 511) 14 DPMR/DMR BER test mode (STD IB CALL), see note 1 Table 1-23 Details of Debug Mode Byte Note 1: The STD IB CAL pattern changes the STB IB 511 pattern with every 100th bit inverted. This gives this pattern a 1% bit error rate 1.2.14 CARRIER_READY This command informs CT3258 that carrier is detected on the RX side. Upon receiving this message, CT3258 start to look for preamble and frame SYNCs. This command is also used to inform CT3258 whether to mute the audio if the called ID (for DPMR calls) or CTCSS/DCS code does match. If carrier detection (SQ) is to be done by CT3258 (enabled by CALLL_OPTION command), this command starts the carrier detection on CT3258. Field Identifier Carrier Ready Indication 1 Byte 1 Byte 0x019 Bit 7:3, Reserved Bit 2: Mute Flag for muting audio if called ID or CTCSS/DCS code does not match. 0: Un-mute the audio even if the called ID (for DPMR calls) or CTCSS/DCS code (for a analog calls) does not match Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 24 1: Mute the audio if the called ID (for DPMR call) or CTCSS/DCS code (for analog calls) does not match, un-mute other wise. Bit 1:0, Carrier ready flag 0: Carrier Lost 1: Carrier Ready 2: Carrier Ready, but the phase of the demodulated signal is reversed. Others: reserved Note： The reverse of demodulated signal polarity does not work in analog mode. Please configure the polarity with ANALOG_SUBAUDIO. Default 0 Table 1-24 CARRIER_READY Field Format 1.2.15 PROCESS_MODE This command set the process mode of CT3258. The process mode includes DPMR / DMR physical layer only (1), physical layer plus data link layer (2) and physical layer plus data link layer plus call control layer (3). This command is also used to enable automatic detection of analog or digital calls. Field Identifier Process Mode 1 Byte 1 Byte 0x01A 2: Layer 2, DPMR / DMR Layer 2 Mode 3: Layer 3, Easy Mode 128: Analog Mode 131: Automatic detection of analog call or DPMR calls (layer 3) Others: Reserved Default 2 Table 1-25 PROCESS_MOD Field Format With layer two processing mode, CT3258 is responsible to perform layer one and layer two processing of the DPMR / DMR protocol, including the FEC, interleaving and message interpretation. Layer 2 processing complies with ETSI TS 102 490 or TS 102 658 in DPMR mode, and ETSI TS 102 361 in DMR mode, With layer three processing mode, in addition to layer two processing, the CT3258 also performs call control of the DPMR / DMR processing. ANNEX A Standard User Interface for CSF radio in DPMR mode, and ANNEX C DMR Numbering and Dialing plan are implemented in CT3258. At the transmitter, CT3258 supports wild character dialing for group and all calls for DPMR and DMR, abbreviated dialing and masked dialing for DPMR. At the receiver, when a call is received, Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 25 CT3258 does matching of individual call number and group number and informs the MCU of matching results. 1.2.16 NEW_EVENT This message is sent when a new event occurs and requires MCU attention. Note that some of the fields different in DPMR and DMR mode. Field Identifier Event 1 Byte 1 Byte 0x01B 0: No event 1: DPMR: New Header frame received, with FEC error DMR: Data Sync received with FEC error 2: DPMR: New End frame received 3: DPMR: New CCH received 4: DPMR New Header frame received with no FEC error DMR: Data SYNC received 5: DPMR: Super Frame received, with no FEC error DMR: Voice SYNC received 6: DPMR: FS3 received 7: DPMR: FS4 received 8: Lost synchronization 9. DPMR: FS1 found pre-alert 10. DPMR: FS2 found pre-alert 11. Reserved 12. Carrier detected 13. Carrier lost 14. Unsupported call received 15. Wrong vocoder 16-255 reserved Default 0 Table 1-26 NEW_EVENT Field Format If a digital call is received and correctly decoded, CT3258 reports NEW_EVENT 4 OR 5. If a digital call is received but has FEC error, CT3258 reports NEW_EVENT 1. These event reports can also be disabled with REPORT_FIELD command. In DPMR mode, if mixed call detection is enabled, and a digital call is received, NEW_EVENT 9 or 10 will be reported first, before complete FEC checking process, to alert MCU that a digital call is received. These events can be used to terminate analog call detection. If CT3258 is to do carrier detection (SQ), NEW_EVENT 12 and 13 are used to report carrier status. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 26 During the course of a digital call, if synchronization pattern is not detected for a period of time (configured through command SYNC_MISS_COUNT), CT3258 reports NEW_EVENT 8. 1.2.17 DEMOD_GAIN This message set the demodulation gain for the demodulator. If the value is zero, auto calibration is used. Table 1-27 DEMOD_GAIN Field Format 1.2.18 REPORT_FIELD This message informs CT3258 what field to report when receiving a call. Field Identifier Mask Byte 1 Byte 1 Byte 0x01D Mask to indicate the field to report when receiving a new call. Each individual bit select one field. Multiple fields can be selected. Default 0x70 Table 1-28 REPORT_FIELD Field Format The details of the bits are different depending on DPMR or DMR mode. Bit Position Field to report 7 NEW_EVENT (FS1 or FS2) 6 DPMR_M_V_F_E 5 DPMR_HT_CI_PM 4 DIGC_CALLED_ID_BIN 3 DPMR_CALLED_ID_BCD 2 DIGC_OWN_ID_BIN 1 DPMR_OWN_ID_BCD 0 DPMR_CC Table 1-29 Bit definition for Mask Byte in DPMR Mode Field Identifier Event 1 Byte 2 Byte 0x01C 0: Auto calibration Others: linear gain values in Q16.11 (16 bits total, 11 bits fraction, MSB first), with 2048 as 0 dB Default 0 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 27 Bit Position Field to report 7 NEW_EVENT (FS1 or FS2) 6 DMR_FLC 5 DMR_CSBK 4-1 Reserved 0 DMR SLOTTYPE OR EMB Table 1-30 Bit definition for Mask Byte in DMR Mode 1.2.19 BER_REPORT This command enquires for the BER test report. The BER includes test success flag, test duration, total number of errors, and error rate in ppm (pieces per million). A duration parameter in the command control the duration used in ppm calculation Field Identifier BER Duration 1 Byte 1 Byte 0x01E BER statistics duration 0: All errors in the test are used in BER ppm calculation 1-30, number of seconds used for ppm calculation. Error beyond the duration are discarded in BER ppm calculation Default 0 Table 1-31 BER_REPORT Field Format The response packet returns the BER results. Table 1-32 BER_REPORT response Field Format 1.2.20 ANALOG_TONE This command enables the CT3258 to generate or stop a tone signals to be played out from the line out port or the MOD port. The tone signal is a repetition of a two-tone pattern, in the form as Tone1-Tone2-Tone1-Tone2….-Tone1-Tone2. Each tone is made up of two frequencies. The Field Identifier Valid Indication Test length Errors Error in PPM 1 Byte 1 Byte 2 Bytes 4 Bytes 4 Bytes 0x01E 1: BER test successful 0: BER test unsuccessful. Result is not meaningful Word (MSB first) to indicate the number of seconds in BER test Long word (MSB first) to indicate the number of errors found. Long word (MSB first) to indicate the error percentage (in ppm) Default 0 0 0 0 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 28 frequencies and amplitudes are programmable. If silence is desired for the second tone, the user should set the two frequencies or the two amplitudes of the second tone to zero. Table 1-33 LOCAL_TONE Field Format Bit Position Field to report 7 Remote Tone Flag 0: Local Tone to the line out port 1: Remote Tone to the MOD port 6-0 Repeat Number 0: Stop Tone 127: Infinite Others: Repetition Number Table 1-34 Definition for TONE_CTRL 1.2.21 CALL_START Call Start command. Upon receiving this command, CT3258 begins to send call to the far end. Field Identifier TONE_CTRL Frequency 11 Frequency 12 Frequency 21 Frequency 22 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 2 Bytes 0x01F See Table 1-32 for Details First frequency of the first tone, in Hz If Bit 7 of the MSB is 1, siren is generated Second frequency of the first tone, in Hz First frequency of the Second tone, in Hz Second frequency of the second tone, in Hz Default 0 NA NA NA NA Amplitude11 Amplitude 12 Amplitude 21 Amplitude 22 Length 1 Length 2 1 Byte 1 Byte 1 Bytes 1 Bytes 2 Bytes 2 Bytes Amplitude of the first frequency of the first tone, in 8 bit linear scale with 6 bit fractions Amplitude of the second frequency of the first tone, in 8 bit linear scale with 6 bit fractions Amplitude of the first frequency of the second tone, in 8 bit linear scale with 6 bit fractions Amplitude of the second frequency of the second tone, in 8 bit linear scale with 6 bit fractions Length of the first tone in milliseco nds. Length of the second tone in milliseco nds. NA NA NA NA NA NA Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 29 Field Identifier Call Details 1 Byte 1 Byte 0x20 DATA[0]={M[2:0], V[1:0], F[1:0], EP} Call Mode, Version, Call Format, Emergency Call flag Default 0 Table 1-35 CALL_START Field Format With CALL_START command, the header type, HT is set to 0x0. The M, F, and P fields are described in the following tables M Communication Modes 000 Voice communication (no user data in SLD field) 001 Voice + slow data (user data in SLD field) 010 Data communication type 1 (Payload is user data without FEC) 011 Data communication type 2 (Payload is user data with FEC) 100 Data communication type 3 (Packet data, ARQ method) 101 Voice and appended data (type 2) 110 Appended data Others Reserved Table 1-36 Communication Mode Field Details V Version number 00 DPMR standard traffic 01 Reserved 10 Reserved 11 Manufacturer specific Table 1-37 Version Field Details F Communication Format 00 Call ALL (Broadcast) 01 Peer-to-peer communication 10 BS uplink 11 BS downlink Table 1-38 Communication Format Field Details EP Emergency Priority Flag 0 Normal call 1 Emergency call Table 1-39 Emergency Priority Flag Field Details Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 30 1.2.22 CALL_STOP Call Stop command. Upon receiving this command, CT3258 sends an END frame to the far end and then stop the call to the far end. Field Identifier 1 Byte 0x21 Table 1-40 CALL_STOP Field Format This command is also used to end an analog call. 1.2.23 CONNECT Call Connect command. Upon receiving this command, CT3258 send connection command to the far end. It is also used send a call alert to the far end in the case of voice calls. Field Identifier Call Details 1 Byte 1 Byte 0x22 DATA[0]={M[2:0], V[1:0], F[1:0], EP} Call Mode, Version, Call Format, Emergency Call flag Default 0 Table 1-41 CONNECT Field Format With CONNECT command, the header type, HT is set to 0x01. The meaning of M, V, F and EP fields are described in Table 1-32 to Table 1-35. If there is no frame after sending this command, we must wait CT3258 report 17 0A then make the subsequent operation (The response time is 150ms+Preamble +Silence+PowerSaveHeader). 1.2.24 DISCONNECT Call Disconnection command. Upon receiving this command, CT3258 sends disconnect command to the far end. Field Identifier Call Details 1 Byte 1 Byte 0x23 DATA[0]={M[2:0], V[1:0], F[1:0], EP} Call Mode, Version, Call Format, Emergency Call flag Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 31 Default 0 Table 1-42 DISCONNECT Field Format With DISCONNECT command, the header type, HT is set to 0x02. The meaning of M, V, F and EP fields are described in section CALL_START. If there is no frame after sending this command, we must wait CT3258 report 17 0A then make the subsequent operation (The response time is 300ms+Preamble +Silence +PowerSaveHeader). 1.2.25 DPMR_ACK ACK command: Upon receiving this command, CT3258 send acknowledgment to the far end. Field Identifier Call Details 1 Byte 1 Byte 0x24 DATA[0]={M[2:0], V[1:0], F[1:0], EP} Call Mode, Version, Call Format, Emergency Call flag Default 0 Table 1-43 DPMR_ACK field Format With DPMR_ACK command, the header type, HT is set to 0x03. The meaning of M, V, F and EP fields are described in section CALL_START. If there is no frame after sending this command, we must wait CT3258 report 17 0A then make the subsequent operation (The response time is 100ms+Preamble +Silence+PowerSaveHeader). 1.2.26 SYSTEM_INFO System Info command, upon receiving this command, CT3258 sends system or status request or response to the far end. Field Identifier Call Details 1 Byte 1 Byte 0x25 DATA[0]={M[2:0], F[3:0], EP} Call Mode, Version, Call Format, Emergency Call flag Default 0 Table 1-44 SYSTEM_INFO field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 32 SYSTEM_INFO command does not set header type, HT, field. The header type can be set with DPMR_HT_CI_PM or DPMR_HT command before sending SYSTEM_INFO. The meaning of M, V, F and EP fields are described in in section CALL_START. If there is no frame after sending this command, we must wait CT3258 report 17 0A then make the subsequent operation (The response time is 150ms+Preamble +Silence+PowerSaveHeader). 1.2.27 ANALOG_SUBAUDIO This field contains analog sub_audio message. Upon receiving this message, CT3258 configure the sub-audio generation and detection setting of CT3258 in analog mode. It is also used to report detection of specific CTCSS/DCS tones and tail detection results. The number of bytes for this field varies depending on the whether arbitrary CTCSS/DCS generation and detection is required. If no arbitrary CTCSS/DCS is required, the field length is 3. If arbitrary DCS code is required, the field length is 5. The added two bytes are for the arbitrary DCS code in hex form. If arbitrary CTCSS code is required, the field length is 9. Two of the added six bytes are for the CTCSS frequencies, another four bytes are for the two coefficients for the narrow band filter for that particular frequency. The CTCSS coefficients are calculated from the arbitrary CTCSS frequency to be detected. The formula is: a1 = round (2048 * sqrt (1.9990 * (1-cos(2*w0)))) a2 = round (-2047*2^9 * cos (w0)) + 2^20 where w0 is calculated from the desired arbitrary CTCSS frequency, f0, by w0 = f0/1909.9 For example for CTCSS frequency 67 Hz, the coefficients are calculated as follows: a1 = round (2048*sqrt (1.9990 * (1-cos (2*67/1909.9)))) = 144 a2 = round ((-2047*2^9 * cos (67/1909.9))) + 2^20 = 1157 The MCU is responsible to calculate the coefficients and pass them to CT3258. Field Identifier Sub-audio Configuration / Status CTCSS/DCS number Arbitrary CTCSS frequency or DCS code Coefficient A1 Coefficient a2 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 33 1 Byte 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 0x26 See Table 1-44 for details 0: No CTCSS /DCS 1-108: CTCSS/DCS code 255: Arbitrary CTCSS/DCS code Others: reserved For CTCSS: CTCSS frequency in steps of 0.1 Hz (MSB first) For DCS, 0-0x1ff, corresponding to the DCS code, in HEX format , MSB first Narrow band filter coefficient a1 for arbitrary CTCSS frequency Narrow band filter coefficient a1 for arbitrary CTCSS frequency Default 0x40 0 NA NA NA Table 1-45 SUBAUDIO Field Format Bit Position Bit Name Descriptions 7 CD_SEL DCS and CTCSS select 0: CTCSS 1: DCS 6 EXP_SEL Expanded CTCSS / DCS code Select 0: Standard CTCSS/DCS set (38 for CTCSS, 83 for DCS) 1: Expanded CTCSS DCS Set (51 for CTCSS, 107 for DCS) 5 Polarity DCS polarity 0: Positive DCS polarity 1: Negative DCS polarity 4 Blind Blind sub-audio detection enable 0: No blind sub-audio detection 1: Blind sub-audio detection enabled. 3 Auto Polarity Detection DCS Auto polarity detection enable 0: DCS Auto polarity detection disabled 1: DCS Audio polarity detection enable 2-1 Tail Detection Configuration or Report In a configuration packet, it is used to enabling tail generation and detection: 00: No Tail detection 01: 120 degree tail 10: 180 degree tail for CTCSS. Enable tail detection for DCS. 11: 240 degree tail In a report packet, it is used to report tail detection Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 34 results: 00: No Tail found 01: 120 degree tail found 10: 180 degree tail found 11: 240 degree tail found 0 FOUND Sub audio find flag 0: No CTCSS/DCS found 1: CTCSS/DCS found Table 1-46 Sub-Audio Configuration Details Serial Number： DCS code in Octal format DCS code in Hex format 1 017 00F 2 023 013 3 025 015 4 026 016 5 031 019 6 032 01A 7 036 01E 8 043 023 9 047 027 10 050 028 11 051 029 12 053 02B 13 054 02C 14 065 035 15 071 039 16 072 03A 17 073 03B 18 074 03C 19 114 04C 20 115 04D 21 116 04E 22 122 052 23 125 055 24 131 059 25 132 05A 26 134 05C 27 143 063 28 145 065 29 152 06A 30 155 06D 31 156 06E Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 35 32 162 072 33 165 075 34 172 07A 35 174 07C 36 205 085 37 212 08A 38 223 093 39 225 095 40 226 096 41 243 0A3 42 244 0A4 43 245 0A5 44 246 0A6 45 251 0A9 46 252 0AA 47 255 0AD 48 261 0B1 49 263 0B3 50 265 0B5 51 266 0B6 52 271 0B9 53 274 0BC 54 306 0C6 55 311 0C9 56 315 0CD 57 325 0D5 58 331 0D9 59 332 0DA 60 343 0E3 61 346 0E6 62 351 0E9 63 356 0EE 64 364 0F4 65 365 0F5 66 371 0F9 67 411 109 68 412 10A 69 413 10B 70 423 113 71 431 119 72 432 11A 73 445 125 74 446 126 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 36 75 452 12A 76 454 12C 77 455 12D 78 462 132 79 464 134 80 465 135 81 466 136 82 503 143 83 506 146 84 516 14E 85 523 153 86 526 156 87 532 15A 88 546 166 89 565 175 90 606 186 91 612 18A 92 624 194 93 627 197 94 631 199 95 632 19A 96 646 1A6 97 654 1AC 98 662 1B2 99 664 1B4 100 703 1C3 101 712 1CA 102 723 1D3 103 731 1D9 104 732 1DA 105 734 1DC 106 743 1E3 107 754 1EC 108 0 000 Table 1-47 DCS Extend Table Serial Number： DCS code in Octal format DCS code in Hex Format 1 023 013 2 025 015 3 026 016 4 031 019 5 032 01A 6 043 023 7 047 027 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 37 8 051 029 9 054 02C 10 065 035 11 071 039 12 072 03A 13 073 03B 14 074 03C 15 114 04C 16 115 04D 17 116 04E 18 125 055 19 131 059 20 132 05A 21 134 05C 22 143 063 23 152 06A 24 155 06D 25 156 06E 26 162 072 27 165 075 28 172 07A 29 174 07C 30 205 085 31 223 093 32 226 096 33 243 0A3 34 244 0A4 35 245 0A5 36 251 0A9 37 261 0B1 38 263 0B3 39 265 0B5 40 271 0B9 41 306 0C6 42 311 0C9 43 315 0CD 44 331 0D9 45 343 0E3 46 346 0E6 47 351 0E9 48 364 0F4 49 365 0F5 50 371 0F9 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 38 51 411 109 52 412 10A 53 413 10B 54 423 113 55 431 119 56 432 11A 57 445 125 58 464 134 59 465 135 60 466 136 61 503 143 62 506 146 63 516 14E 64 532 15A 65 546 166 66 565 175 67 606 186 68 612 18A 69 624 194 70 627 197 71 631 199 72 632 19A 73 654 1AC 74 662 1B2 75 664 1B4 76 703 1C3 77 712 1CA 78 723 1D3 79 731 1D9 80 732 1DA 81 734 1DC 82 743 1E3 83 754 1EC 84 0 000 Table 1-48 DCS Standard Table Serial Number： CTCSS frequency 1 67 2 71.9 3 74.4 4 77 5 79.7 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 39 6 82.5 7 85.4 8 88.5 9 91.5 10 94.8 11 97.4 12 100 13 103.5 14 107.2 15 110.9 16 114.8 17 118.8 18 123 19 127.3 20 131.8 21 136.5 22 141.3 23 146.2 24 151.4 25 156.7 26 162.2 27 167.9 28 173.8 29 179.9 30 186.2 31 192.8 32 203.5 33 210.7 34 218.1 35 225.7 36 233.6 37 241.8 38 250.3 39 134.4 Table 1-49 CTCSS Standard Table Serial Number： ctcss 52 digit decimal 1 63 2 67 3 69.3 4 71.9 5 74.4 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 40 6 77 7 79.7 8 82.5 9 85.4 10 88.5 11 91.5 12 94.8 13 97.4 14 100 15 103.5 16 107.2 17 110.9 18 114.8 19 118.8 20 123 21 127.3 22 131.8 23 136.5 24 141.3 25 146.2 26 151.4 27 156.7 28 159.8 29 162.2 30 165.5 31 167.9 32 171.3 33 173.8 34 177.3 35 179.9 36 183.5 37 186.2 38 189.9 39 192.8 40 196.6 41 199.5 42 203.5 43 206.5 44 210.7 45 218.1 46 225.7 47 229.1 48 233.6 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 41 49 241.8 50 250.3 51 254.1 52 134.4 Table 1-50 CTCSS Extend Table 1.2.28 CALL_MATCH This field is used in a CT3258 generated report message when a call is received, as a result from a CARRIER_READY command from the MCU. It is generated if a DPMR or a DMR call is received and that the receiver can start to SYNC with the transmitter. Field Identifier Call Details 1 Byte 1 Byte 0x27 See Table 1-48 for details Default 0 Table 1-51 CALL_MATCH Field Format Table 1-52 Call Match Details 1.2.29 ADDRESSING_MODE This field is used to configure the addressing mode of CT3258 for DPMR. As described in the DPMR spec (TS 102 490 or 658).), with initial addressing mode, the user uses 254 binary ID’s. With configured addressing mode, the user can use a dial pad to dial 7 digital numbers. Bit Position Bit Name Descriptions 7-4 Group ID For group calls, the matched group ID 3 CC Match Color code match status 0: Color code matched 1: Color code not matched 2 Un-match Reason The reason for call not matching 0: Valid Called ID not received 1: Called ID not matched Others: reserved 1 Group Call Group or individual call flag when a call is matched 0: Individual call 1: Group call 0 Called ID Match Flag Called ID Match Flag 0: Called ID matched with receiver Own ID, or one of the receiver group ID 1: Called ID is not matched Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 42 The field format is described below. Field Identifier Addressing Mode Details 1 Byte 1 Byte 0x28 See Table 1-50 for details Default 0 Table 1-53 ADDRESSING_MODE Field Format Bit Position Bit Name Descriptions 7-4 Reserved Reserved 3-1 Dial mask Length 0-6: The length of the Dial mask for Configured Addressing mode Others: invalid. 0 Mode Select Address mode select 0: Initial Addressing mode 1: Configured Address mode (Standard User Interface) Table 1-54 Addressing Mode Details The number of digital the user is allowed to dial is (7- Dial_Mask_Length). For example, 3 mean that 3 numbers are masked. The user is able to dial a maximum of 4 numbers. By default, Dial_Mask_Length = 0, meaning no mask is used and the user is allowed to dial all 7 digits. 1.2.30 GROUP_ID The command is for DPMR mode only. A separate command DMR_GROUP_ID is used for DMR mode. Each DPMR terminal can be assigned an individual ID (own ID) and one or several group ID’s. When an incoming called ID matched with the receiver’s individual ID or group ID, the receiver responds. The GROUP_ID field is used to pass the group ID to CT3258. This field contains the group ID in 7 BCD codes and one group number. Field Identifier Group ID and group number 1 Byte 4 Bytes 0x29 DATA[0]= {K1, K2} DATA[1]= {K3, K4} DATA[2]= {K5, K6} DATA[3]= {K7, Group Number}, where group number can be 1-15 Default 0,0,0,0 Table 1-55 GROUP_ID Field Format K1, … , K7 are 0-9 for BCD numbers, or 10 for ‘*’. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 43 The command fields support up to 15 group numbers. 1.2.31 SCRAMBLER_SEED This command enables/disables the voice scrambler for encryptions and selects the 32 bit scrambler seed. Field Identifier Scrambler Type Scrambler seeds 1 Byte 1 Bytes 0/4 bytes 0x2A 0: Disable the Scrambler 1: Enable 32 bit scrambler (DPMR Mode only) 4: Enabled 16 bit scrambler 0 byte if scrambler type = 0; 4 bytes if scrambler type = 1; DATA[0] = SEED[31:24] DATA[1] = SEED[24:16] DATA[2] = SEED[15:8] DATA[3] = SEED[7:0] 2 bytes if scrambler type = 4; DATA[0] = SEED[15:8] DATA[1] = SEED[7:0] Default 0 0,0,0,0 Table 1-56 SCRAMBLER_SEED Field Format Note: The 32 bit scrambler is indeed a 16 bit scrambler. The first 16-bit is used as scrambler seed which the end user can program. The second 16-bit is an XOR mask, which can be used by radio manufacturers to purposely make their radio to be incompatible with radio made by other manufactures. The second 16-bit should have at least 5 “1” to be effective. For the 16 bit scrambler, when this command is set in TX, please set the PM in HT_CI_PM command to enable the encryption function. 1.2.32 MOD_GAIN This message set the modulation gain for the modulator. Field Identifier Event 1 Byte 2 Byte 0x02C Linear gain applied to the modulator in Q16.11 (16 bits total, 11 bits fraction, MSB first), with 2048 as 0 dB Table 1-57 MOD_GAIN Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 44 1.2.33 CODEC_SELECT This command selects the codec that works with CT3258. Current supported codecs include TLC320AIC3204 from TI and WM8758B from Wolfson. Field Identifier Codec Selection 1 Byte 1 Bytes 0x02D 1: TLC320AIC3204 2: WM8758B 3: ES8338 Others: reserved. Default 2 Table 1-58 CODEC_SELECT Field Format 1.2.34 SET_I2C_ADDRESS CT3258 also supports other types of codecs, as long as it has an I2C interface for control and a serial interface for data transfer which conforms with CT3258 format and timing. The I2C address of the codec can be set the command SET_I2C_ADDRESS Field Identifier I2C Address 1 Byte 1 Bytes 0x02E I2C address to pass to codec Default 0x34 Table 1-59 SET_I2C_ADDRESS Field Format 1.2.35 SYNC_MISS_COUNT Once a call is set up, CT3258 monitor the link conditions and continuously check the presence of synchronization word, (FS2 in the case DPMR and Voice SYNC pattern in DMR). It reports SYNC miss if the number of sync miss is greater than a threshold. This command set the threshold. Table 1-60 SYNC_MISS_COUNT Field Format Field Identifier Sync Miss Count 1 Byte 1 Bytes 0x02F Threshold for sync miss counter before reporting to MCU. 0-254: threshold of sync miss to exceed (greater than) before report sync miss 255: never report sync miss Default 255 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 45 The message to report Sync miss is NEW_EVENT with field value of 0x08. 1.2.36 Q_PRO_STR This command enquires for product code. Field Identifier 1 Byte 0x030 Table 1-61 Q_PRO_STR Field Format The response packet returns a string: “CT3258” or other product code. Field Identifier Number of Bytes Data 1 Byte 1 Byte Variable Number of bytes 0x30 Number of bytes “CT3258F” Table 1-62 Q_PRO_STR Field Options 1.2.37 Q_HW_VER This command enquires for hardware version. Field Identifier 1 Byte 0x031 Table 1-63 Q_HW_VER Field Format The response packet returns a string: “V0.01.01” or other hardware version. Field Identifier Number of Bytes Data 1 Byte 1 Byte Variable Number of bytes 0x31 Number of Bytes “V0.02.02” Table 1-64 Q_HW_VER Field Options 1.2.38 Q_SW_VER This command enquires for software version: Field Identifier 1 Byte 0x032 Table 1-65 Q_SW_VER Field Format The response packet returns a string: “V0.01.01” or other software version. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 46 Field Identifier Number of Bytes Data 1 Byte 1 Byte Variable Number of bytes 0x32 Number of Bytes “V1.00.04” Table 1-66 Q_SW_VER Field Options 1.2.39 Q_CID_SN This command enquires for customer ID and serial number. Field Identifier 1 Byte 0x033 Table 1-67 Q_CID_SN Field Format The response packet returns customer ID in 6 BCD numbers and serial number in 10 BCD numbers. Field Identifier Customer ID Serial Number 1 Byte 3 Bytes 5 Bytes 0x33 Customer ID in 6 BCD numbers Serial Number in 10 BCD numbers Table 1-68 Q_CIN_SN Field Options 1.2.40 DMR_GROUP_ID Each DMR terminal can be assigned an individual ID (own ID) and one or several group ID’s. When an incoming called ID matched with the receiver’s individual ID or group ID, the receiver responds. The DMR_GROUP_ID field is used to pass the group ID to CT3258. This field contains the group ID in 8 BCD codes and one group number. Field Identifier Group ID and group number 1 Byte 5 Bytes 0x29 DATA[0]= {K1, K2} DATA[1]= {K3, K4} DATA[2]= {K5, K6} DATA[3]= {K7, K8} DATA[4] = Group Number where group number can be 1-15 Default 0,0,0,0 Table 1-69 GROUP_ID Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 47 K1, … , K8 are 0-9 for BCD numbers. The command fields support up to 15 group numbers. 1.2.41 DC_OFFSET This command applies a DC offset to the input signals from the ADC and to the output signal to the DAC. It also applies a digital gain to the signals to the DAC before DC offset is added. The value of the DC offset is in 2’s complements, with 0x7fff corresponds to the maximum positive DC offset, and 0x8000 corresponds to the maximum negative DC offsets. The electrical voltage of the DC offset depends on the codec types and the analog gain that is applied to the codec. With zero analog gain, the maximum offset is capped by the supply voltage of the codec, and the minimum is capped by zero. In the case of DAC output, a gain is applied to the output signal before DC offset is added. The gain is in linear scale, with 0x0800 corresponding to zero gain. Field Identifier DC offset for ADC Left Channel DC offset for ADC Right Channel DC offset for DAC Left Channel DC offset for DAC right Channel Digital Gain for DAC left channel Digital Gain for DAC right Chanel 1 Byte 2 Byte 2 Bytes 2 Bytes 2 Bytes 2 Bytes 2 Bytes 0x039 DC offset Value, MSB followed by LSB, 0x8000-0x7 fff DC offset Value, MSB followed by LSB, 0x8000-0x7 fff DC offset Value, MSB followed by LSB, 0x8000-0x7 fff DC offset Value, MSB followed by LSB, 0x8000-0x7 fff Digital Gain Value, MSB followed by LSB, In linear Scale, Q16.11 Digital Gain Value, MSB followed by LSB, In linear Scale, Q16.11 Default 0 0 0 0 2048 2048 Table 1-70 DC_OFFSET Field Format When paired with SCT3700, DC_OFFSET command is also used to read the DC levels and amplitudes of the signal in the RX path. In addtion, the DC levels and amplitudes of TX signal can be read by looping the TX to the RX and then read the RX DC levels and amplitudes. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 48 To read DC levels and amplitudes, DC_OFFSET command should be sent with “Read/Write” bit in the TYPE field set to 1. The DC_OFFSET command used in “read” mode has the following format: Field Identifier DC Time Constant 1 Byte 1 Byte 0x39 Time constant for averaging DC and amplitude. Default 0 Default time constant of 0 corresponds to average time of 31.25 ms, which is the time it takes to reach within 10% of the steady state energy value. If the constant is n, the average time is given by the following formula: T = 31.25 * 2^n. The Response to the read DC_OFFSET read command has the following format: Field Identifier DC offset for the Left Channel DC offset for the Right Channel Amplitude for the Left Channel Amplitude for the Right Channel Total energy of IQ channel Division out of AMP_I/AMP _Q 1 Byte 2 Byte 2 Bytes 2 Bytes 2 Bytes 4 Bytes 1 Byte 0x039 DC offset Value, MSB followed by LSB, in Q16.15, 0x8000-0x7fff DC offset Value, MSB followed by LSB, in Q16.15, 0x8000-0x7fff Amplitude Value, MSB followed by LSB, in Q16.15 0x0-0x7fff Amplitude Value, MSB followed by LSB, in Q16.15 0x0-0x7fff I^2 +Q^2, used to do TX DC calibration, only for SCT3700, Used for IQ calibration only for SCT3700 Default - - - - 1.2.42 ANALOG_CONFIG This command changes the CT3258 configuration in analog mode. The parameter that can be configured in analog mode include LPF selection for 12.5 kHz or 25 kHz channel spacing, pre-emphasis and de-emphasis filter settings, and various gain values at different stages in the signal chain. All gain values are linear gain with 16 bit resolution. Field Identifier Mode Configure TX gain Before Limiter TX Gain after Limiter CTCSS Gain DCS Gain RX Volume Gain 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 2 bytes 2 Bytes 0x03C See Table 16 bit linear 16 bit linear 16 bit linear 16 bit 16 bit linear Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 49 Table 1-71 ANALOG_CONFIG Field Format Bit Position Bit Name Descriptions 7 ALT_LPF Additional attenuation at 3 kHz when BB_CH_SEL = 1 6 DCS_HPF DCS high pass filter enable flag, for removing DC 0: DCS high pass filter is disabled 1: DCS high pass filter is enabled 5 COMPANDER Compander enable 0: Compander is disabled 1: Compander is enabled. 4 ANA_TONE_CFG Analog Tone configure 0: No CTCSS or DCS when sending analog tones 1: Send CTCSS or DCS when sending analog tones 3 IF_CH_SEL IF Channel Select 0: 12.5 kHz channel 1: 25 kHz channel 2 SKIP_EMP Skip pre-emphasis and de-emphasis filters 0: No skip pre-emphasis and de-emphasis filters 1: Skip pre-emphasis and de-emphasis filters 1 BB_CH_SEL Base band channel filter select 0: LPF corner at 2.55k Hz 1: LPF corner at 3 kHz 0 FILTER_BYPASS Filter by pass. All analog signal processing in the TX path and the RX path are bypassed if this bit is set. Table 1-72 Mode Configure Details Note that IF_CH_SEL and BB_CH_SEL can be different. IF_CH_SEL selects 12.5KHz narrow band channel selection filter or 25 kHz wide band channel selection filter. BB_CH_SEL selects the base band filter LPF corner. The following table gives a guide line for IF_CH_SEL or BB_CH_SEL settings. IF_CH_SEL BB_CH_SEL Standard 0 0 12.5kHz narrow band channel, compliant with Europe CE standards (ETSI EN 300 296) 0 1 12.5kHz narrow band channel, compliant with US FCC standards (TIA 603) 1 0 N/A 1 1 25 kHz wide band channel, compliant with Europe CE standards 1-67 for details gain, MSB first, in Q16.11 gain, MSB first, in Q16.12 gain, MSB first, in Q16.12 linear gain, MSB first, in Q16.12 gain, MSB first, in Q16.11 Default 2 2048 4096 4096 4096 2048 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 50 (ETSI EN 300 296) and US FCC standards (TIA 603). When BB_CH_SEL = 1, the user can configure ALT_LPF, to add an 1.5 dB attenuation at 3kHz. This is useful for two point modulation when the VCO boosts the frequency response at 3kHz, which may result in the total frequency response out of the spec. 1.2.43 CTC_PARAM This command is used to configure CTCSS detection parameters. The CTCSS detection is done with two conditions, frequency and energy. The frequency has to be close to the designated CTCSS frequency, and the CTCSS energy has to above a certain threshold. To reduce the probability of false detection, both conditions have to be satisfied for a number of times before a CTCSS detection is declared. If one of the conditions is not satisfied for a number of times, CTCSS lost is declared. This command sets those thresholds. Instead of using the standard phase reversal as CTCSS tail, SCT3258 can also send 55 Hz tone at the end of call as an indication for call end. “55 Hz” is used here as a general term for the special tone for call end indication. Its frequency is a programmable. CTC_PARAM command is also used to configure the mode and frequency of the 55 Hz tone. Also, as in the CTCSS tone case, a narrow band filter (NBF) is used to capture the 55 Hz tone. The coefficients for the NBF need to be set in this command if the 55 Hz tone detection is enabled. Freq_Tough Eng_Tough Tail_180 Tail_120 CTC_Tail_DI 55 Hz Tail Configuration 1 Byte 1 Bytes 1 Bytes 1 Bytes 1 Bytes 1 Byte Number of times Number of times energy 180 degree CTCSS tail 120 degree CTCSS tail CTCSS tail detection 55 Hz Tail Configuration, Field Identifier Energy_Hi Energy_Lo Freq_Miss Eng_Miss Freq_norm Eng_Norm 1 Byte 2 Byte 2 Bytes 1 Bytes 1 Bytes 1 bytes 1 Bytes 0x3D Energy high threshold for CTCSS found detection Energy low Threshold for CTCSS lost detection Number of times frequency conditions missed before declaring CTCSS lost Number of times energy conditions missed before declaring CTCSS lost Number of times frequency conditions satisfied before declaring CTCSS found under good condition Number of times energy conditions satisfied before declaring CTCSS found under good condition Default 0x0384 0x0258 6 4 2 1 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 51 frequency conditions satisfied before declaring CTCSS found under tough condition conditions satisfied before declaring CTCSS found under tough condition detection threshold. Higher threshold make it more difficult to detect tail. detection threshold. Higher threshold make it more difficult to detect tail. index, larger index value makes detection easier. A value of 0 is the hardest. See Table below for details 7 6 0x80 0xd0 0 0 Tail Frequency Tail NBF Coefficients Signal to Total Energy Ratio Reserved 2 Bytes 4 Bytes 1 Byte 2 bytes Special Tail frequency, in steps of 0.1 Hz (MSB first). 55 Hz as default. Narrow band filter coefficients for the special tail frequency. See Section 1.2.27 for details of the coefficients Signal to Total Energy Ratio Threshold for CTCSS detection. The larger the threshold, the more difficult to detect 2, 38 0, 118, 3, 179 0xb0 0 Table 1-73 CTC_PARAM Field Format Bit Position Bit Name Descriptions 7 ANA_END_SEND Flag for sending end of transmission 0: No 17 0A sent after CTCSS/DCS tail is sent 1: 17 0A sent after CTCSS/DCS tail is sent 6 CTCSS_TOL CTCSS detection tolerance 0: No tolerance if received CTCSS frequency is off spec 1: More tolerance if received CTCSS frequency is off spec. 5 TAIL_LENGTH Flag for analog tail length for CTCSS and DCS 0: tail length 180 ms 1: tail length 250 ms 4 HPF_CORNER Flag for analog High pass filter corner 0: HPF corner at 300 Hz 1: HPF corner at 450 Hz 3 CTC_TAIL_RX 55 Hz tail detection enable in CTCSS call: Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 52 0: 55 Hz Tone detection enabled 1: 55 Hz Tone detection enabled 2 VOICE_TAIL_RX 55 Hz tail detection enable in call with no sub-audio: 0: 55 Hz Tone detection enabled 1: 55 Hz Tone detection enabled 1 CTC_TAIL_TX 55 Hz tail enable in CTCSS call: 0: No 55 Hz Tone are sent at the end of call 1: 55 Hz Tone are sent at the end of call 0 VOICE_TAIL_TX 55 Hz tail enable in voice call with no sub-audio: 0: No 55 Hz Tone are sent at the end of call 1: 55 Hz Tone are sent at the end of call Table 1-74 55 Hz Tail Configuration Details 1.2.44 VOCOER_IO_SET This field selects the input and output settings for vocoders. It is most used for voice recording and play back. Currently, this command is only used in DPMR mode only. Field Identifier Recording/Play Back Setting 1 Byte 1 Byte 0x03e Vocoder IO configuration, See table below Default 0 Table 1-75 VOCODER_IO_SET Field Format Bit Position Bit Name Descriptions 7 Reserved Reserved 6 MOD_IN Modulator input select: 0: from vocoder 1: from MCU (through CHAN_D commanad) 5:4 ENC_OUT Voice encoder output select: 00: Voice encoder output to modem 01: Voice encoder output to MCU 10: Voice encoder output to modem and MCU 3 DEC_IN Voice decoder input select: 0: from demodulator 1: from MCU (through CHAN_D commanad) 2 DEMOD_OUT Demodulator output select 0: to voice decoder 1: to MCU (through CHAN_D commanad) and to voice decoder 1 Reserved Reserved 0 Reserved Reserved Table 1-76 Vocoder IO Configuration Details Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 53 With VOCODER_IO_SET command, the user can implement functions like local/remote recording and local/remote play back. The following table gives example of the settings. Function Vocoder IO Settings Local Recording 0x20 Remote Recording 0x04 Local Play back 0x08 Remote Play back 0x40 Table 1-77 Vocoder IO Settings for Different Functions 1.2.45 MODOUT_CONFIG This command is used to configure the phase delay between the two channels in a two point modulation scheme. Adding a phase delay between the channels is useful to achieve a flat frequency response in two point modulation. The minimum step size is 10.4 us. And maximum delay is plus or minus 416 us. For example, if the phase delay time is set to 0x08,the signal at LOR is 83.2 us after the signal at LOL .If phase delay time is set to 0xf8, then the signal at LOR is 83.2 us a head of with the signal at LOL. Field Identifier Phase delay time configure Reserved 1 Byte 1 Byte 4 Bytes 0x041 Minimum to -40 max to 40, with a step size of 10.4 us Reserved Default 0 0,0,0,0 Table 1-78 MODOUT_CONFIG Field Format 1.2.46 IQCOMP_COEF This command is used when paired with SCT700 only. This command is used to configure the IQ compensation filter of for the RX path and the TX path. If CT3258 works in IQ input or IQ output mode, the I path and the Q path of the RF front en should be perfectly matched, or the performance suffers. However, the I path and the Q path are never perfectly matched in the analog world. IQ compensation filter are used to re-aligned the IQ signals so that they are matched. The figure below shows the control data and control signals of IQ compensation filter. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 54 External Codec I Q coef_amp coef_phi IQ_Mode I_Out Q_out Figure 1-1 IQ Compensation Filter The IQ compensation filter has two operation modes: the normal mode and the calibration mode. In normal mode (IQ_Mode = 0), the IQ compensation filter is enabled. In calibration mode (IQ_Mode = 1), the IQ compensation filter is disabled, allowing the algorithm to evaluate the amount of IQ imbalance, and calculate the filter coefficients coef_amp and coef_phase accordingly. The default values of coef_amp and coef_phi are 0, which should be the value if I and Q path are perfect aligned and need to compensation. In calibration mode, the value coef_phase has no effect, while coef_amp has an effect to the output. To complete disable IQ compensation filter, coef_amp should be set to zero, while IQ_Mode is set to 1. CT3258 has internal algorithm to aid the calculation of the IQ compensation filter coefficients. The user can use the DC_OFFSET read command to see the effect of the calibration. The structure of the TX IQ compensation filter and the RX IQ compensation filter are identical. Both compensation filters are configured with IQCOMP_COEF command. The contents of the IQCOMP_COEF command are described in the table below. Field Identifier Mode Configure rx_coef_amp rx_coef_phi tx_coef_amp tx_coef_phi 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 2 bytes 0x042 See Table 1-80 for details RX amplitude coefficient, 16 bit linear value, MSB first, in Q16.14 RX phase coefficient, 16 bit linear value, MSB first, in Q16.14 TX amplitude coefficient, 16 bit linear value, MSB first, in Q16.14 TX phase coefficient, 16 bit linear value, MSB first, in Q16.14 Default 2 0 0 0 0 Table 1-79 IQCOMP_COEF Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 55 Bit Position Bit Name Descriptions 7 Reserved Reserved 6 RX_IQ_MODE RX IQ compensation Filter work mode 0: Enable RX IQ compensation Filter, with coefficients described in the subsequent field parameters 1: RX IQ compensation Filter in calibration mode (only rx_coef_amp is effective) 5-3 Reserved Reserved 2 TX_IQ_MODE TX IQ compensation Filter work mode 0: Enable TX IQ compensation Filter, with coefficients described in the subsequent field parameters 1: TX IQ compensation Filter in calibration mode (only tx_coef_amp is effective) 1-0 Reserved Reserved Table 1-80Mode Configure Details If Bit 6 (RX_IQ_MODE) is set to 1, the RX phase coefficients in the command do not take effect. Likewise, the TX phase coefficients in the command does not take effect unless Bit 2 (TX_IQ_MODE) of the mode byte is 0. IQCOMP_COEF command is also used to read the IQ compensation filter coefficients currently used by CT3258, either calculated by CT3258 or set previously by the MCU. The response packet to the read command is identical to configuration packet. 1.2.47 DIGC_DATA_FRAME This field contains type 1, 2, 3 data, voice and appended data, transparent data and short appended data. Field Identifier Frame Property Data Length Data Bytes 1 Byte 1 Byte 1 Byte Up to 180 bytes 0x43 See the following tables for detail 0-180: Indicate the length of the Data Others: reserved DATA[0] DATA[1] … DATA[DataLength-1] Contain data, start from DATA[0], MSB first Default NA NA NA Table 1-81 DIGC_DATA_FRAME Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 56 The frame property field for DPMR and for DMR are different. Bit Position Bit Name Descriptions 7 DATA_VALID Flag to indicate whether current frame has valid data 0: Current frame has no valid data. Far end can discard current frame 1: Current frame has valid data. 6 CONT_FLAG Continuation flag 0: Data Continues after this frame 1: Data finish at this frame CT3258 does not process this field. It just passes this bit to the far end MCU. The MCU should not send more DIGC_DATA_FRAME commands after CONT_FLAG is set to one. 5 FEC_ERROR FEC error flag 0: No FEC error in the received frame 1: FEC error in the received frame 4 Reserved Reserved 3-0 Frame Type Frame types: 0: Type 1 Data, Valid Data Length is 0 to 36 1: Type 2 Data, Valid Data Length is 0 to 20 2: Type 3 Data, Not implemented yet 3: Voice and Appended Data, Valid Data Length is 0 to 20 4: Transparent Data, Valid Data Length is 0 to 48 5. Short Appended Data, Valid Data Length is 9, 18, 27, 36 depending on the number of appended data frames. Others, reserved Table 1-82 Frame Property Details in DPMR Mode Bit Position Bit Name Descriptions 7-5 Reserved 4 Data/Voice Burst Data or voice burst selection 0: Data Burst 1: Voice Burst 3-0 Data Type DMR data type (for data burst only) 0: PI header 1: Voice LC header 2: Terminator with LC 3: CSBK 4: MBC Header 5: MBC Continuation 6: Data Header 7: Rate 1/2 Data 8: Rate 3/4 Data Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 57 9: Idle 10: Rate 1 Data 11-15: Reserved Table 1-83 Frame Property Details in DMR Mode At the transmitter, the MCU passes the contents of data burst to CT3258 through this field. CT3258 adds FEC according to the data type and puts into a TDMA burst. At the receiver, CT3258 applies FEC decoding to the received data burst and reports the contents to the MCU using the same field. The content and the length of the frame is different according to the data type in DMR_DATA_FRAME. The details is describe in the below text. When Data Type is PI header , Voice LC Header ,Terminator with LC, or the bit 4 is Voice Burst, the content of the frame is FULL LC PDU(without CRC). The length is 9 bytes. Table 1-84 FULL LC PDU When Data Type is CSBK or MBC Header, the content of the frame is Control Signalling Block (CSBK) PDU (without CRC ). The length is 10 bytes. Information element Length Remark Last Block 1 This bit shall be set to 1 Protect Flag 1 CSBK Opcode(CSBKO) 6 FID 8 The FID shall be either SFID or MFID CSBK Data 64 NOTE : The data information element is defined by TS 102 361-2[5] Table 1-85 CSBK PDU When Data Type is MBC Continuation, the content of the frame can be MBC Continuation Block or MBC Last Block.The length is 12 bytes. Information element Length Remark Last Block 1 Information element Length Remark Protect Flag (PF) 1 Reserved 1 Full Link Control Opcode (FLCO) 6 Feature set ID (FID) 8 The FID shall be either SFID or MFID Error Full LC Data 56 (see note 1) NOTE 1: The data information element is defined by the feature protocol document TS 102 361-2 [5]. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 58 MBC data 95 Table 1-86 MBC Continuation Block Information element Length Remark Last Block 1 MBC Data 79 MBC CRC 16 Filled with 0, calculated by the chip automatically Table 1-87 MBC Last Block When Data Type is DATA_HEADER, the content of the frame is DATA_HEAD_PDU. We introduce the C_HEAD_PDU only (without CRC, the other HEAD_PDU is in the TS 102 361-1 Protocol ). The length is 10 bytes. Information element Length Remark Group or Individual 1 This bit is set to indicate that the destination LLID is for a group Response Requested (A) 1 Header Compression (HC) 1 Pad Octet Count (POC) 1 Format 4 Data packet identification SAP Identifier 4 Pad Octet Count (POC) 4 Logical Link ID (LLID) 24 Destination Logical Link ID (LLID) 24 Source Full Message Flag (FMF) 1 Blocks to Follow (BF) 7 Re-Synchronize flag (S) 1 Send sequence Number (N(S)) 3 Fragment Sequence Number (FSN) 4 Table 1-88 C_HEADER_PDU When Data Type is Rate 1/2 Data, the contents of the frame can be Confirm_R_1_2_DATA_CONTINU_PDU, UNConfirm_R_1_2_DATA_CONTINU_PDU, Confirm_R_1_2_DATA_LAST_PDU or UNConfirm_R_1_2_DATA_LAST_PDU.The length is 12 bytes. See details from table 1-65 to 1-68. Information element Length Remark Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 59 Data Block Serial Number (DBSN) 7 C-DATA CRC 9 Filled with 0, calculated by the chip automatically User Data 80 The user data field may contain pad octets Table 1-89 Confirm_R_1_2_DATA_CONTINU_PDU Information element Length Remark User Data 96 The user data field may contain pad octets Table 1-90 UNConfirm_R_1_2_DATA_CONTINU_PDU Information element Length Remark Data Block Serial Number (DBSN) 7 C-DATA CRC 9 Filled with 0, calculated by the chip automatically User Data 48 The user data field may contain up to 6 pad octets Message CRC 32 Filled with 0, calculated by the chip automatically Table 1-91 Confirm_R_1_2_DATA_LAST_PDU Information element Length Remark User Data 64 (see note) Message CRC 32 Filled with 0, calculated by the chip automatically NOTE:The user data field may contain up to 8 pad octets. Table 1-92 UNConfirm_R_1_2_DATA_LAST_PDU When Data Type is Rate 3/4 Data, the contents of the frame can be Confirm_R_3_4_DATA_CONTINU_PDU, UNConfirm_R_3_4_DATA_CONTINU_PDU, Confirm_R_3_4_DATA_LAST_PDU or UNConfirm_R_3_4_DATA_LAST_PDU.The length is 12 bytes. See details from table 1-69 to 1-72. Information element Length Remark Data Block Serial Number (DBSN) 7 C-DATA CRC 9 Filled with 0, calculated by the chip automatically User Data 128 The user data field may contain pad octets Table 1-93 Confirm_R_3_4_DATA_CONTINU_PDU Information element Length Remark User Data 144 The user data field may contain pad octets Table 1-94 UNConfirm_R_3_4_DATA_CONTINU_PDU Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 60 Information element Length Remark Data Block Serial Number (DBSN) 7 C-DATA CRC 9 Filled with 0, calculated by the chip automatically User Data 96 The user data field may contain up to 12 pad octets Message CRC 32 Filled with 0, calculated by the chip automatically Table 1-95 Confirm_R_3_4_DATA_LAST_PDU Information element Length Remark User Data 112 The user data field may contain up to 14 pad octets Message CRC 32 Filled with 0, calculated by the chip automatically Table 1-96 UNConfirm_R_3_4_DATA_LAST_PDU When Data Type is IDLE, the content of the frame is IDLE_PDU. The length is 12 bytes.See details in table 1-73. Information element Length Remark User Data 96 Table 1-97 IDLE_PDU When Data Type is Rate 1 Data, the contents of the frame can be Confirm_R_1_DATA_CONTINU_PDU, UNConfirm_R_1_DATA_CONTINU_PDU, Confirm_R_1_DATA_LAST_PDU or UNConfirm_R_1_DATA_LAST_PDU.The length is 24 bytes. See details from table 1-74 to 1-77. Information element Length Remark Data Block Serial Number (DBSN) 7 C-DATA CRC 9 Filled with 0, calculated by the chip automatically User Data 176 The user data field may contain pad octets Table 1-98 Confirm_R_1_DATA__CONTINU_PDU Information element Length Remark User Data 192 The user data field may contain pad octets Table 1-99 UNConfirm_R_1_DATA__CONTINU_PDU Information element Length Remark Data Block Serial Number (DBSN) 7 C-DATA CRC 9 Filled with 0, calculated by the chip automatically User Data 144 The user data field may contain up to 18 pad octets Message CRC 32 Filled with 0, calculated by the chip automatically Table 1-100 Confirm_R_1_DATA__LAST_PDU Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 61 Information element Length Remark User Data 160 (see note) Message CRC 32 Filled with 0, calculated by the chip automatically NOTE:The user data field may contain up to 20 pad octets. Table 1-101 UNConfirm_R_1_DATA__LAST_PDU 1.2.48 DPMR_PREAMBLE_LENGTH DPMR standard allows the length of the preamble to be more than the default 72 bits (15 milliseconds). This command sets the length of additional preambles and length of silence (before preamble) in increment of 20 milliseconds Field Identifier Preamble Length Silence Length 1 Byte 1 Bytes 1 Byte 0x046 Length additional Preambles in 20 millisecond unit Silence length before preamble in 20 millisecond unit Default 0 0 Table 1-102 DPMR_PREAMBLE_LENGTH Field Format 1.2.49 DPMR_CALL_OPTION This field is used to set the DPMR specific call options Field Identifier DPMR Call Options 1 Byte 5 Bytes 0x47 Data[0]: Bit 7: Slot timing flag 0: The message sent to far end can be sent freely 1: The message sent to far end has to be sent at slot boundary. The first bit of the preamble will be sent 30 milliseconds from the last bit of the last received message Bit 6: SQ detection enable 0: SQ detection is not done by CT3258 1: SQ detection is done by CT3258 Bit 5: IQ receive enable 0: CT3258 in IF IQ mode 1: CT3258 in base band mode Bit 4: RF control enable 0: CT3258 does not control RF chip (SCT3700) 1: CT3258 controls RF chip. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 62 Bit 3-0: Number of the power saving headers to precede the next message. Zero to disable power saving headers Data[1]: voice delay constant and transmit control Bit 7: IQ transmit enable 0: CT3258 transmitting in IQ mode 1: CT3258 transmitting in base band mode Bit 6: Enable Wrong Vocoder report Bit 5:0: voice delay constant 0-40: voice delay constant in steps of 40 milliseconds Data[2]: Report options Bit 7: 1B 09, 1B 0A report 0: No report of 1B 09 and 1B 0A 1: Report 1B 09 and 1B 0A Others: reserved Default 0 Table 1-103 DPMR_CALL_OPTION Field Format Note: In order to send extended power saving headers, DPMR_CALL_OPTION must be called each time when a communication is to start 1.2.50 DPMR_END_UE This field contains the 17 bits of unencoded END data. Field Identifier 17 bit of unencoded END 1 Byte 3 Bytes 0x4B DATA[0]={ET[1:0], ARQ[1:0], TX_WAIT[3:0]} DATA[1]={STATUS[4:0], 3b000} DATA[2]=0 Default 0,0,0 Table 1-104 DPMR_END_UE Field Format The details of ET, ARQ, TX_WAIT and status are given in the following tables. 00 Normal end frame 01 End frame with status message 10 Reserved 11 Reserved Table 1-105 Details ET Field 00 No ACK request to called station 01 ACK request to called station Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 63 10 Reserved 11 Reserved Table 1-106 ARQ Field Details 0000 No specified time 0001 40 ms (half a frame) 0010 80 ms (one frame) 0011 160 ms (two frames) 0100 320 ms (one superframe) Other Other Reserved Table 1-107 Details of Tx WAIT Field 1.2.51 DIGC_FS1 This field contains the 48 bits of FS1 data for DPMR. It is also used to generate a fixed 48 bit test pattern for both DPMR and DMR mode. Field Identifier 48 bit of encoded FS1 1 Byte 6 Bytes 0x4C DATA[0]=FS1[47:40] DATA[1]=FS1[39:32] … DATA[5]=FS1[7:0] Default 0x57,0xff,0x5f,0x75,0xd5,0x77 Table 1-108 DIGC_FS1 Field Format 1.2.52 DIGC_CALLED_ID_BIN This field contains the called ID in 24 bit binary form. Field Identifier 24 bit binary called ID 1 Byte 3 Bytes 0x50 DATA[0]=CALL_ID_BIN[23:16] DATA[1]= CALL_ID_BIN [15:8] DATA[2]= CALL_ID_BIN [7:0] Default 0,0,0 Table 1-109 DIGC_CALLED_ID_BIN Field Format 1.2.53 DIGC_OWN_ID_BIN This field contains the own ID in 24 bit binary form. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 64 Field Identifier 24 bit binary own ID 1 Byte 3 Bytes 0x51 DATA[0]=OWN_ID_BIN[23:16] DATA[1]= OWN_ID_BIN [15:8] DATA[2]= OWN_ID_BIN [7:0] Default 0,0,0 Table 1-110 DIGC_OWN_ID_BIN Field Format 1.2.54 DPMR_CALLED_ID_BCD This field contains the called ID in 7 BCD codes. Field Identifier Called ID in 7 BCD codes 1 Byte 4 Bytes 0x52 DATA[0]= {K1, K2} DATA[1]= {K3, K4} DATA[2]= {K5, K6} DATA[3]= {K7, 0x4b0000} Default 0xaa,0xaa,0xaa,0xa0 Table 1-111 DPMR_CALLED_ID_BCD Field Format If the user dials less than 7 digits, the user should use 0x0F to fill the place for un-dialed digits. Upon receiving the message with less than 7 digits, CT3258 will fill the rest of the digits to complete 7 digits if layer 3 process mode is enabled. 1.2.55 DPMR_OWN_ID_BCD This field contains the own ID in 7 BCD codes. Field Identifier Own ID in 7 BCD codes 1 Byte 4 Bytes 0x53 DATA[0]= {K1, K2} DATA[1]= {K3, K4} DATA[2]= {K5, K6} DATA[3]= {K7, 0x4b0000} Default 0x00,0x00,0x00,0x00 Table 1-112 DPMR_OWN_ID_BCD Field Format 1.2.56 DPMR_M_V_F_E This field contains communication mode (M), version (V), and communication format (F) fields. Field Identifier M and F fields 1 Byte 1 Byte Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 65 0x54 DATA[0]={M[2:0], V[1:0], F[1:0], EP} Default 0 Table 1-113 DPMR_M_V_F Field Format The meaning of M, V, F and EP are described in section CALL_START. 1.2.57 DPMR_PROTOCOL_OPTION This field is used to set the DPMR specific protocol options Field Identifier DPMR Protocol Options 1 Byte 1 Byte 0x55 Bit 7: Protocol Support 0: Support TS 102 490 1: Support TS 102 490 and TS 102 658 Bit 6: NDR Support 0: No Support for NDR 1: Support for NDR Bit 5 : TS 102 658 Mode 3 Support 0: No Support for Mode 3 1: Support for Mode 3 Bit 4: Maintenance Message Report 0: Repeated Maintenance Message only reported only once. 1: Every reported messages are reported Bit 3: Reserve (Should set to zero) Bit 2: Reserve Bit 1 : All call mapping 0: Old way of all call mapping: TS 102 658 (V2.1.1 or earlier) 1: New way of all call mapping Bit 0 : 12.5 kHz DPMR support. 0: 6.25 kHz DPMR 1: 12.5 kHz DPMR Default 0 Table 1-114 DPMR_PROTOCOL_OPTION Field Format 1.2.58 DPMR_SLD This field contains 18 bits of slow data. Field Identifier M and F fields 1 Byte 4 Bytes 0x56 DATA[0]=SLD[17:10] Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 66 DATA[1]=SLD[9:2] DATA[2]={SLD[1:0], 0x000000} Default 0x80,0x40,0x00 Table 1-115 DPMR_SLD Field Format The meaning of SLD field is defined in the TS 102 658 or TS 102 490: Bit position Meaning 17 Continuation Flag 1 0: User data continuous after the following byte 1: User data is terminated by the following byte 16-9 User data byte 1 8 Continuation Flag 2 0: User data continuous after the following byte 1: User data is terminated by the following byte 7-0 User data byte 2 Table 1-116 Details SLD Field Note that SLD filed can also be modified by WORK_MODE command. Upon receiving command WORK_MODE with the mode set to TX or duplex, the SLD field is reset to default 0x80, 0x40, 0x00. In a typical voice call with slow data, the MCU always send WORK_MODE command before sending the first DPMR_SLD command. 1.2.59 DPMR_HT_CI_PM This field contains header type (HT) and call information (CI) fields. Field Identifier HT and CI fields 1 Byte 2 Bytes 0x57 DATA[0]={HT[3:0], CI[10:7]} DATA[1]={CI[6:0], PM} Default 0,0 Table 1-117 DPMR_HT_CI_PM Field Format Details of HT, CI and PM can be found in the following tables. HT indicates header type. 0000 Communication start header (a superframe follows) 0001 Connection request header (an END frame follows) 0010 Unconnect request header (an END frame follows) 0011 ACK (this a single frame, ACK or NACK is differentiated by the CI bits setting) 0100 System request header (an END frame follows) or Maintenance Message header Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 67 0101 ACK header reply to a system request (a superframe follows) 0110 System delivery header (a superframe follows) 0111 Status response header (an END frame follows) 1000 Status request header Other Reserved Table 1-118 Header Type Details PM is the channel preservation flag used for base station to send out channel preservation messages. When sending a voice call, this bit is used to enable the encryption. PM Channel Preservation Flag 0 Channel is not preserved 1 Channel is preserved Table 1-119 Channel Preservation Flag Field Details CI contains 3 bits of CI type and 8 bits of CI information. CI Type CI Information 3 bits 8 bits Table 1-120 CI Format The meaning of CI depends on the header types. Use Purpose Power save Indicate normal or extended header type T1 or T2 Data Indicate the type of data (supplementary service) T3 Data (Packet) Indicate data frame size and number of frames Acknowledgements Indicate ACK or NACK and reason System request System response Delivery Header CI Type defines the purpose CI Information is not used and set to 0000 0000 Table 1-121 CI Usuage The details of CI for different header types are described in the following sub-sections, 1.2.59.1 Call Information for Power Save CI Type (3 bits): CI Type Definition 111 Extended wake-up Header Other value Normal Header type Table 1-122 CI Type for Power Save If the extended wake-up Header is used then the last 4 information bits will show how many Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 68 Headers frames follow the current one (i.e. counting down to zero). 0000 0000 Normal Header frame 0000 0001 -------------- 0000 1111 Ext Header frame 1 ------------------------------------------------------- Ext Header frame 15 Other Reserved Table 1-123 CI Information for Power Save 1.2.59.2 Call Information for Types 1 and 2 data Data communications (types 1 and 2): CI Type CI Information 001 Format Reserved 4 bits 4 bits Table 1-124 CI Type for Type 1 and Type 2 Data Reserved bits are set to 0000. Format: 0000 Status message 0001 Precoded message 0010 Free text message (radio generated data) 0011 Short file transfer 0100 User defined data 1 0101 User defined data 2 0110 User defined data 3 0111 User defined data 4 Other Reserved Table 1-125 CI Information for Type 1 and Type 2 Data 1.2.59.3 Call Information for Type 3 (packet) data Information bits for Packet data format (Type 3): CI Type CI Information 011 pdS Frame Size pdM Data Size 4 bits 4 bits Table 1-126 CI for Type 3 Data Details of pdS (packet data size) and pdM (number of transmitted frames) are details by the tables below. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 69 pdS Frame time (ms) Data size bits 0 80 288 1 160 672 2 240 1056 3 320 1440 Other Reserved Reserved Table 1-127 Packet Data Frame Sizes (pdS) pdM Number of Data frames 0 1 frame 1 2 frames 2 3 frames 3 4 frames 4 5 frames 5 6 frames 6 7 frames 7 8 frames Other Reserved Table 1-128 Number of Transmitted Frames (pdM) 1.2.59.4 Call Information for System Transactions System request/answer/delivery header: CI Type Definition 000 Reserved 001 Dynamic group request/answer/delivery 010 Reserved 011 Reserved 100 ESN request/reply 101 MFID request/reply 110 Contact station address(via Interconnect, IP) 111 Reserved Table 1-129 CI Type for System Transactions CI Info Definition 0000 0000 All bits set to zero (the data size is indicated in the CCH SLD field) Table 1-130 CI Information for System Transactions 1.2.59.5 Call Information for Acknowledgments Acknowledgment: Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 70 CI Type Definition 000 Reserved 001 ACK (Rx OK) 010 NACK (data error, resend request) 011 NACK (request denied) Other Reserved Table 1-131 CI Type for Acknowledgements CI Info Definition 0 1 to 255 ACK/NACK status (rejection reason defined by user) Table 1-132 CI Information for Acknowledgements 1.2.59.6 Call Information for appended data CI type: CI Type Definition Meaning 000 Short Data Service Requested is Short Data 011 Call Diversion Call Diversion Service Table 1-133 CI type for Appended data Short data CI Info: CI Info length Meaning UAD(0 - 3) [7:6],2 bits Appended Short Data Number of appended UDTs required to transport short data SYMB [5:0],6 bits Number of symbols in the short data , Table 1-134 CI Information for Short data Call Diversion CI Info: CI Info Length Meaning UAD(00) [7:6],2 bits Number of Appended Data = 1 SYMB [5:0],6 bits N/A for call diversion Table 1-135 CI Information for Call Diversion 1.2.59.7 Call Information for Maintenance Message CI type Type Definition CI Info 000 IDLE Message N/A 001 Guard Message See table below Preservation message See note Table 1-136 Call Information for Maintenance Message Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 71 CI Info length Meaning Reserved [7:4],4bits Reserved Guard Kind [3:0],4 bits 0000 Reserved 0001 DIS_PTT Disable Target MS or Talkgroup PTT 0010 EN_PTT Enable Target MS or Talkgroup PTT 0011 ILLEGALLY PARKED Clear down from the payload channel MS whose address does not match,Source or Target Address 0100 to 1111 Reserved Table 1-137 Call Information for Guard Message Note: Preservation message is not identified by CI. It is identified with PM as 1. In preservation message, CI keeps value of previous traffic channel down link messages, along with CALLED ID, OWN ID, M, V, F, and EP fields. 1.2.60 DPMR_CI This field contains 11 bits call information. It is used for reporting CI information by CT3258 to the MCU upon receiving an extended header. Field Identifier CI field 1 Byte 2 Byte 0x5A DATA[0]={CI[10:3]} DATA[1]={CI[2:0], 0x5b00000} Default 0,0 Table 1-138 DPMR_CI Field Format 1.2.61 DPMR_CC This field contains the 24 bits of CC data for the transmitter and the receiver. Field Identifier 24 bit of encoded CC 1 Byte 3 Bytes 0x5C DATA[0]=CC[23:16] DATA[1]=CC[15:8] DATA[2]=CC[7:0] Default 0x57, 0x75,0x77 Table 1-139 DPMR_CC Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 72 1.2.62 DPMR_SEND_SF Send super frame command. Upon receiving this command, CT3258 assemble a super frame and send to the far end. Field Identifier 1 Byte 0x5F Table 1-140 DPMR_SEND_SF Field Format 1.2.63 DPMR_SEND_HEADER Send header frame command. Upon receiving this command, CT3258 assemble a header frame and send to the far end. Field Identifier 1 Byte 0x60 Table 1-141 DPMR_SEND_HEADER Field Format 1.2.64 DPMR_SEND_END Send end frame command. Upon receiving this command, CT3258 assemble an end frame and send to the far end. Field Identifier 1 Byte 0x61 Table 1-142 DPMR_SEND_END Field Format 1.2.65 DPMR_SEND_AD Send DPMR_SEND_AD command. Upon receiving this command,CT3258 assemble a series of appended data frmae，include HEADER FRAME ,APPENDED DATA FRAME (according as appended data number),END FRAME. Field Identifier Call Details 1 Byte 1 Byte 0x62 DATA[0]={M[2:0], V[1:0], F[1:0], EP} Call Mode, Version, Call Format, Emergency Priority Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 73 Default 0 Table 1-143 DPMR_SEND_AD Field Format DPMR_SEND_AD can only be used in TS 102 658 PROTOCOL. The meaning of M, V, F and EP fields are described in the section CALL_START. Note: Please set the content of appended data frame with DIGC_DATA_FRAME command before sending appended data frame with this command. 1.2.66 DIGI_MIC_GAIN This message set the modulation gain for the microphone used in the digital mode only. Table 1-144 DIGI_MIC_GAIN Field Format 1.2.67 DIGI_SPEAKER_GAIN This message set the modulation gain for the speaker used in the digital mode only. Table 1-145 DIGI_SPEAKER_GAIN Field Format 1.2.68 I2C_OPERATION This command is used to read and write raw I2C command to the I2C devices that are connected to CT3258. Examples of the connected devices include codec, security keys and RF transceiver. This command differs from the codec bypass packet described in 1.1.3 in that codec bypass packet can only be used for certain codecs, while I2C_OPERATION can be used for any connected I2C devices. Field Identifier Event 1 Byte 2 Byte 0x068 Linear gain applied to the microphone in Q16.11 (16 bits total, 11 bits fraction, MSB first), with 2048 as 0 dB. This gain is used in digital mode only Field Identifier Event 1 Byte 2 Byte 0x069 Linear gain applied to the speaker in Q16.11 (16 bits total, 11 bits fraction, MSB first), with 2048 as 0 dB. This gain is used in digital mode only Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 74 Table 1-146 I2C_OPERATION Write Field Format To read from I2C device, the user should set TYPE field to 0x20, and the I2C_OPERATION syntax is as follows: Field Identifier I2C device Address Device register address I2C Data Length 1 Byte 1 Byte 1 Byte 1 Byte 0x06A I2C device address Device register address Number of Bytes to Read Default 0 0 0 Table 1-147 I2C_OPERATION Read Field Format The response packet returns the I2C data Field Identifier Data read from I2C 1 Byte I2C Data Length 0x6A Data[0] Data[1] … Data[I2C Data Length-1] Default 0 Table 1-148 I2C_OPERATION Read Response Field Format 1.2.69 MISC_GAIN This command set the various gain levels, including the input and output gain for IQ signal, and CTCSS/DCS receive gains, and frequency of the signal used for calibration, and DC filter settings. Field Identifier IQ TX Gain IQ RX Gain CTCSS/DCS Receive Gain Calibration Signal Frequency DC Filter Configuration Reserved 1 Byte 2 Bytes 2 Bytes 2 Bytes 2 Bytes 1 Byte 3 Bytes 0x06B 16 bit linear 16 bit linear 16 bit linear 16 bit linear See table Field Identifier I2C device Address Device register address I2C Data Length I2C data 1 Byte 1 Byte 1 Byte 1 Byte I2C Data Length 0x06A I2C device address Device register address Number of Bytes to Write. Data[0] Data[1] … Data[I2C Data Length] Default 0 0 0 N/A Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 75 gain, MSB first, in Q16.11 gain, MSB first, in Q16.11 gain, MSB first, in Q16.11 gain, MSB first, in Q16.11 below for detail. Default 2048 2048 2048 2048 0 Table 1-149 MISC_GAINS Field Format Bit Position Bit Name Descriptions 7-2 Reserved 1 DC Filter enable 0: DC filter is disabled 1: DC filter is enabled. 0 Manual DC Mode 0: Auto DC Mode, DC filter is enabled at low input level and disabled at high input level for digital calls, and always enabled for analog call. 1: Manual DC Mode. See bit 1 for details. Table 1-150 DC Configuration Detail The IQ RX gain is applied to the input IQ signals (when IQ receive is enabled) after it is received by CT3258. The IQ TX gain is applied to the output IQ signals (when IQ transmit is enabled) before it is sent to the codec. The CTCSS/DCS receive gain is used in analog mode, and is applied to the CTCSS/DCS signals after the 300 HF LPF. It is used to adjust the level of DCS subaudio signals without affecting the level of audio signals. The calibration signals are I / Q sinusoidal signals generated by CT3258 TX path, which can be looped back by SCT3700 to CT3258 RX for I Q calibration. The frequency of the signals can be programmable with this command. A default value of 2048 corresponds to a frequency of 350 Hz. 1.2.70 SQ_LEVEL This command is used for calibration of SQ detection. It is also used to read the RSSI and OOBE levels. Field Identifi er GAIN_ ADJUS T EXT LNA_ GAINL Forced RF Gain OOBE_ INTV OOBE _HI_D OOBE _LO_D OOBE _HI_A OOBE _LO_A 1 Byte 1 Byte 1Byte 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 2 Bytes Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 76 0x06C Gain Adjust ment, from -128 dB to +127 dB Externa l LNA value. Refer to table below. Forced RF Gain Setting. See table below for Details OOBE detectio n interval in units of 1.333 ms. Digital OOBE high thresh old, 16 bit linear value Digital OOBE low thresh old, 16 bit linear value Analog OOBE high thresh old, 16 bit linear value Analog OOBE low thresh old, 16 bit linear value Default 0 0 0 90 0x4000 0x0400 0x4000 0x0400 Table 1-151 SQ_LEVEL Field Format Bit Position Bit Name Descriptions 7 Forced RF Gain Enabled 0: Forced RF Gain Disable. RF gain controlled by AGC algorithm 1: Forced RF Gain Enabled. RF gain are setting by bit 6-0. 6-0 Gain Details RF Gain Details: It is different for RDA1847 or SCT3700 For RDA1847, 0-15, Gain Index Others, reserved For SCT3700 Bit 6-4: LNA gain setting 001: highest gain 010: highest gain -6 dB 011: highest gain -12 dB 100: highest gain -24 dB 101: highest gain -36 dB 110: highest gain -48 dB Others: reserved Bit 3-0: PGA settings: 0000: lowest gain 0001-1100, 2-24 dB, 2 dB a step Others, reserved Table 1-152 Force RF Gain Details Bit Position Bit Name Descriptions 7:0 External LNA gain Setting Only For SCT3700 Bit 7:6: Reduction of AGC target level. 00: Maximum AGC target level used 01: Maximum AGC target level – 6 dB Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 77 10: Maximum AGC target level – 12 dB 11: Maximum AGC target level – 18 dB Bit 5:0: External LNA gain in db if it is used. If the external LNA is not used, the value is always zero. If the external LNA is used, it is the difference of external gain value when external LNA is enabled and when it is disabled. Please refer to Chapter 2.6 for its usage. Table 1-153 External LNA setting Details GAIN ADJUST is used to account for all unspecified gains in the analog path. It may be different with different analog implementations. It may be even different from radio to radio. The RSSI is correct only if the value is set correctly. If external LNA is used, it need to be disabled when calibrating GAIN_ADJUST. If external LNA is not used, “EXT LNA GAIN” should be assigned to its default value of zero. If external LNA is used, the user should set EXT LNA GAIN appropriately to reflect the characteristic of the external LNA. It involves two part. Bit 5-0 is used to set the value of LNA gain in dB. It reflect the receive gain increase when the external LNA is enabled from when it is disabled. Also, if the external LNA is used, the user should lower the maximum SCT3700 AGC gain to avoid saturating the RX signals. The amount of maximum AGC target level decrease are set by bit 7-6 of “EXT LNA GAIN” fields. The following is a guide line: 00: if the external LNA gain is less than 6 dB. 01: if the external LNA gain range in 6-12db 10: if the external LNA gain range in 12-18db 11: if the external LNA gain range in 18-24db OOBE indicates the energy of FM demodulated signals at frequency band above 3 kHz. OOBE value is small when RF carrier signal exists, and large when no carrier signals present. It is a good indication for SQ (or carrier) detection. Typically, when carrier signals present, OOBE level is below 8. OOBE level has a high threshold and a low threshold for SQ detection, with the high threshold larger than the low threshold. To detect the presence of carrier, the OOBE level is compared with the low threshold. Carrier detection is reported if the OOBE level is above the low threshold. Once carrier is found, the OOBE level is compared with the high threshold. If the OOBE level is lower than the high threshold, carrier lost is reported. The OOBE levels for analog and digital calls are different. As a result, CT3258 has two sets of high and low OOBE threshold for digital and analog separately. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 78 SQ_LEVEL command is also used to read narrow, wide band RSSI and OOBE levels. The response packet has the following format. Field Identifier NB_RSSI WB_RSSI OOBE Level Inband Level 1 Byte 1 Byte 1 Byte 2 Byte 2 Byte 0x06C Narrow band RSSI + 137 Wide band RSSI + 137 OOBE level Inband signal energy level Default There are two RSSI estimators in the CT3258. One of them is narrow band RSSI, used to estimate the energy of signals in the channel of interests. The other is wide band RSSI, used to estimate the energy of the signal in the channel of interests and surrounding channels. All RSSI values in this command are of dB scale. All RSSI values are expressed as unsigned 8 bit integer. The real RSSI is this value minus 137. For example, for WB_RSSI value of 17, the real wide band RSSI is 17 – 137 = -120 dBm. 1.2.71 SPI_OPERATION This command is used to write raw SPI command to the SPI devices that are connected to CT3258. Examples of the connected devices include SCT3700. Field Identifier SPI Register Address SPI register Contents 1 Byte 1 Byte 1 Byte 0x06D SPI Register Address SPI register Contents Default 0 0 Table 1-154 SPI_OPERATION Write Field Format The SPI register table for SCT3700 can be found in SCT3700 data sheet. 1.2.72 DMR_SLC This command is used to report the short LC data from the base station. Field Identifier Offset 1 Byte 4 Bytes 0x06E Contains 28 bit of SLC data Default 0 Table 1-155 DMR_SLC Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 79 1.2.73 DMR_CALL_SLOT This field is used to set the slot number for the transmitting or receiving calls. DMR_CALL_ SLOT Call Timing Update Direct TDMA Rev Slot mode 1 BYTE BIT[7] BIT[6] BIT[3] BIT[4] BIT[3:0] 0x6F 0:Receive Call 1:Transmit Call 0: keep current TX timng 1: Update TX timing according RX timing 0: Direct TDMA Mode disabled 1: Direct TDMA mode enabled Reserved 0:random 1:slot1 2:slot2 3:both(only Rx) Table 1-156 DMR_CALL_SLOT Field Format Note that the slot number is in terms of mobile station slot number, or downlink slot number. 1.2.74 EQULIZER_FILTER This command configures the coefficients for the audio equalizer filters. A total of up to three equalizer filters can be enabled. Each filter is a second order IIR filter implemented in straight form. The transfer function of the filters are shown in the following equation: H(z) = (b0 + b1 * z^(-1) + b2*z^(-2)) / (1 + a1 * z^(-1) + a2 * z^(-2)) The sampling rate of the filter is 24 kHz. This command gives the filter coefficients. All coefficients are in Q16.14 format (16 bit total, with 14 bit fraction), with MSB first By default, no equalizer filter is enabled. Field Identifier Filter Selection Byte a1 a2 b0 b1 b2 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes 2 Bytes 2 Bytes 0x70 Bit 7-6: reserved Bit 5: TX or RX selection 0: Filter at RX side 1: Filter at TX side Bit 4: Enable flag 1: Selected filter enabled 0: Selected filter not enabled Bit 3-0: Filter selection a1 in Q16.14 MSB first a2 in Q16.14 MSB First b0 in Q16.14 MSB First b1 in Q16.14 MSB first b2 in Q16.14 MSB First Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 80 1: Filter 1 selected 2: Filter 2 selected 3: Filter 3 selected Others: reserved Default 0 - - - - - Table 1-157 EQUALIZER FILTER Field Format 1.2.75 DMR_FLC This message set the information for the FLC in a DMR control packet. Field Identifier FLC 1 Byte 3 Byte 0x076 Data[0] = {PF, REV, FLCO[5:0]} Data[1] = {FID[7:0]} Data[2] = {SeversOption[7:0]} Table 1-158 DMR_FLC Field Format Details of the elements are defined in the DMR standard (TS 102 361) PF field is defined by： PF Protect Flag 0 Reserved Table 1-159 PF Settings FLCO field is defined by: FLCO Full Link Control Opcode 000000 Group Voice Call（Grp_V_Ch_Usr） 000011 Unit to Unit Voice Call（UU_V_Ch_Usr） Table 1-160 FLCO Settings FID field is defined by: FID Feature set ID 0000 0000 Standardized feature set ID for the services 0000 0001 Reserved for future standardization 0000 0010 Reserved for future standardization 0000 0011 Reserved for future standardization 0000 0100 Manufacture’s specific feature set ID(MFID) Etc. Etc Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 81 0111 1111 Manufacture’s specific feature set ID(MFID) 1xxx xxxx Reserved for future MFID’s allocation(MFID) Table 1-161 FID Settings Service Option field is defined by: Service option element Bit position Value remark Emergency Bit[7] 0:Non-Emergency service 1:Emergency service Privacy Bit[6] 0:privacy is not defined Reserved Bit[5:4] 00:Reserved for future Broadcast Bit[3] 0:Non-broadcast service Open voice call mode(OVCM) Bit[2] 0:Non_OVCM call 1:OVCM call Priority level Bit[1:0] 00: NO Priority 01: Priority 1 10: Priority 2 11: Priority 3 Note: Priority 3 is the highest Priority Table 1-162 Service Option Settings 1.2.76 DMR_CC This message set the color code index for DMR calls Field Identifier CC 1 Byte 1 Byte 0x077 0: CC0 is used 1: CC1 is used … 15: CC15 is used Table 1-163 DMR_CC Field Format 1.2.77 DMR_CALL_START This command is used to start a call. Upon receiving this command, CT3258 begins to send call to the far end. Field Identifier 1 Byte 0x078 Table 1-164 DMR_CALL_START Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 82 1.2.78 DMR_CALL_OPTION This field is used to set the DMR specific call options Field Identifier DMR Call Options 1 Byte 5 Bytes 0x79 Data[0]: Bit 7: unused slot fill pattern 0: unused slot filled with 0 1: unused slot filled with random bits. Bit 6: SQ detection enable 0: SQ detection is not done by CT3258 1: SQ detection is done by CT3258 Bit 5: IQ receive enable 1: CT3258 in IF IQ mode 0: CT3258 in base band mode Bit 4: RF control enable 0: CT3258 does not control RF chip (SCT3700 or RDA 1847) 1: CT3258 controls RF chip. Bit 3: RF slot timing control (SCT3700 Only) 0: No control of SCT3700 TX signal during transmission 1: Turn on and off SCT3700 TX signal aligned with the base band slot timing. Bit 2: RF_TIMING RX mode enable 0: RF_TIMING port outputs slot timing information in TX mode only 1: RF_TIMING port outputs slot timing information in TX mode and RX mode Bit 1-0: Traffic mode 0: DMR continuous transmission mode 1: DMR direct mode with no reverse channel 2: DMR direct mode with reverse channel Data[1]: voice delay constant and IQ transmit mode Bit 7: IQ transmit enable 1: CT3258 transmitting in IQ mode 0: CT3258 transmitting in base band mode Bit 6: Reserved Bit 5:0: voice delay constant 0-40: voice delay constant in steps of 40 milliseconds Others: reserved Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 83 Data[2]: Bit 7-4: Number of good CACH received before reporting DMR_SLOT_FOUND with the slot verified flag set. Bit 3-0: Number of repeated LC header Data[3]: Bit 7-6: Reserved Bit 5-0: Bit mask for reporting repeated identical messages. Bit 4: 0, report identical SLC once 1, report every SLC Bit 3: 0: Report identical IDLE data frames once 1: Report all IDLE data frames Bit 2: 0: Report identical CSBK data frames once 1: Report all CSBK data frames Bit 1: 0: Report identical LC headers once 1: Report all LC headers Bit 0: 0: Report identical LC terminators once 1: Report all LC terminators Data[4]: Reserved Default 0 Table 1-165 DMR_CALL_OPTION Field Format 1.2.79 DMR_OFFSET This command set the timing offset of the RF_TIMING signal to the internal slot timing signal, which is aligned with base station timing. With default parameters, the RF_TIMING signal is identical to the internal slot timing signal, which has a 60 millisecond period and 50% duty cycle, with the rising edge aligned with the end of a BS slot. With DMR_OFFSET command, the RF_TIMING signal can be ahead or lag of the internal slot timing signals. Field Identifier Offset Length 1 Byte 2 Bytes 2 Bytes 0x07A 16 bit signed integer, MSB first. The unit is 41.7 microseconds. The range is -720 to 720, or -30 milliseconds to +30 16 bit unsigned integer, MSB first. The unit is 41.7 microseconds. The range is 240 to 1200, or 10 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 84 milliseconds milliseconds to 50 milliseconds Default 0 720 Table 1-166 DMR_OFFSET Field Format 1.2.80 DMR_SLOT_TYPE This field is used report the slot type when a call is received. Slot Type Colour Code Data Type 1 BYTE BIT[7:4] BIT[3:0] 0x7B Value:0-15 0000:PI header 0001:Voice LC header 0010:Terminatior with LC 0011:CSBK 0100:MBC header 0101:MBC continuation 0110:data header 0111:rate 1/2 data 1000:rate 3/4 data 1001:idle 1010:Rate1 Data Others:Reserved for future use Table 1-167 DMR_SLOT_TYPE Field Format 1.2.81 DMR_EMB This field is used report the EMB field when a call is received. DMR_EMB Colour Code PI LCSS Rev 1 BYTE BIT[7:4] BIT[3] BIT[2:1] BIT[0] 0x7C Value:0-15 Reserved 00:Single fragment LC or first fragment CSBK signalling 01:First fragment of LC signalling 10:Last fragment of LC or CSBK signaling 11:Continuation fragment of LC or CSBK Reserved Table 1-168 DMR_EMB Field Format Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 85 1.2.82 DMR_CALLED_ID_BCD This field contains the called ID in 8 BCD codes. Field Identifier Called ID in 7 BCD codes 1 Byte 4 Bytes 0x7D DATA[0]= {K1, K2} DATA[1]= {K3, K4} DATA[2]= {K5, K6} DATA[3]= {K7, K8} Default 0xaa,0xaa,0xaa,0xaa Table 1-169 DMR_CALLED_ID_BCD Field Format K1 should be either 0 or 1. An 8 digit BCD should not exceed “16777016”. If the user wishes to dial a 7 digit BCD number “1234567”, he/she should fill the K1-K8 as “01234567”. 1.2.83 DMR_OWN_ID_BCD This field contains the own ID in 8 BCD codes. Field Identifier Own ID in 7 BCD codes 1 Byte 4 Bytes 0x7E DATA[0]= {K1, K2} DATA[1]= {K3, K4} DATA[2]= {K5, K6} DATA[3]= {K7, K8} Default 0x00,0x00,0x00,0x00 Table 1-170 DMR_OWN_ID_BCD Field Format 1.2.84 DMR_SLOT_FOUND This field is used by CT3258 to inform the MCU that synchronization with the far end BS or MS is achieved and CACH is decoded. DMR_SLOT FOUND Slot Found Details 1 BYTE 1 Byte 0x7F Details in the table below Table 1-171 DMR_SLOT_FOUND Field Format Bit Position Bit Name Bit Descriptions 7 Sync Type MS Sync or BS Sync Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 86 0: MS Sync 1: BS Sync 6 Slot Verify Slot verify flag 0: Slot not verified 1: Slot Verified 5 Slot invert Slot invert flag 0: slot not inverted from last report 1: slot inverted from last report 4 Reserved Reversed 3 AT Access Type 0:inbound channel is idle 1:inbound channel is busy note:in continuous transmission mode, for both voice and data,the AT bit is set to 1; 2 TC TDMA Channel selection 0:Following outbound burst is channel 1 1:Following outbound burst is channel 2 1:0 LCSS/TD MA SLOT When BS SYNC is found (bit 7 = 1), These two bits indicate LCSS 00:Single fragment LC or first fragment CSBK signalling see note 01:First fragment of LC signalling 10:Last fragment of LC or CSBK signaling 11:Continuation fragment of LC or CSBK Signaling When MS SYNC is found (bit 7 = 0), this two bit indicates the types of MS SYNC found 0: no TDMA direct SYNC 1: TDMA SYNC 1 found 2: TDMA SYNC 2 found Table 1-172 Slot Found Details This field is used only by CT3258 to report the CACH information when BS SYNC is found, or types of MS SYNC if MS SYNC is found. Identical CACH are not reported to reduce the traffic between CT3258 and the MCU (after CACH is verified). A CACH verify scheme is used in reporting DMR_SLOT_FOUND. Bit 7-4 of Byte 2 of DMR_CALL_OPTION command specifies the number of good CACH received before reporting DMR_SLOT_FOUND with the slot verified flag set. Before the number of good CACH has reached the specified limit, CT3258 reports every CACH that is found, without setting the slot verified flag. When the specified limit is reached, CT3258 reports the last CACH with the slot verified flag set. If the slot number of the last reported CACH matches the previously reported CACH, it indicates that no slot inversion is needed. If the slot number of the last reported CACH does not match the previously reported CACH, it indicates that slot inversion is needed. In this case, the user should treat all previous report CACH as if the slot number is inverted (1 as 2, and 2 as 1). Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 87 2 Application Guides 2.1 Code Downloading After CT3258 reset, it first down loads a boot loader from the MCU through the HPI and then execute the boot loader. The boot loader then loads the rest of the application from the embedded flash and start execution. 2.1.1 Boot loader Downloading The boot loader is a program with fixed 1024 words. It is downloaded to CT3258 after CT3258 reset. After the initial reset, CT3258 enters into boot loading mode. In boot loading mode, CT3258 is automatically configured after reset to load a 1024-word block of instructions from the HPI port. CT3258 then begins executing that instruction block immediately. The HPI port is configured as 16-bit mode, low-byte first, and either Intel mode or Motorola mode. PIO1 is sampled and used to select either Intel (LOW input) or Motorola (HIGH input). The host must download exact 1024 words for this boot process to work. Note that the boot loader for DPMR mode and DMR mode is different. Depending on the boot loader types, CT3258 enters DPMR mode or DMR mode. In DPMR mode, commands for DMR only (type 5) are not recognized. In DMR mode, command for DPMR only (type 3) are not recognized. 2.1.2 Application Downloading After the boot loader is downloaded to CT3258 and executed, CT3258 reads the application firmware in the embedded flash and start execution. 2.2 DPMR Call Processing CT3258 support two ways of processing digital calls: Easy Mode (layer 3), DPMR Layer 2 Mode (layer 2). Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 88 2.2.1 Easy Mode The Easy Mode is for users who don’t have the in-depth understanding the DPMR protocol. MCU uses simple CALL_START, CALL_STOP, CONNECT, DISCONNECT messages to start, stop a voice calls, or initiate or disconnect a data calls. Internally, CT3258 handles all call processing according the DPMR Protocol . With Easy Mode, in addition to layer two processing, the CT3258 also performs call control of the DPMR processing. “ANNEX A” Standard User Interface for CSF radio are implemented in CT3258. At the transmitter, CT3258 supports wild character dialing, abbreviated dialing and masked dialing. At the receiver, when a call is received, CT3258 matches incoming called number with its own individual call number and group number and informs the MCU of matching results. With Easy Mode, CT3258 strictly complies with the DPMR protocol (ETSI TS 102 490 or 658). The ability to change any aspect of the protocol is disabled. The process mode can be set or changed with PROCESS_MODE command. For Easy Mode, Mode 3 is selected with PROCESS_MODE command. 2.2.1.1 Transmitting In Easy Mode, the MCU passes called ID and own ID to CT3258. CT3258 saves this information in the internal registers. Upon receiving a CALL_START packet, it formatted the information according to the DPMR protocol and send to the far end. For example, a voice can be started with the following packet. Packet Header START_BYTES LENGTH TYPE Fields DPMR_CALLED_ID DPMR_OWN_ID CALL_START Parity FBYTE PARITY_BYTE Table 2-1 Example Packet For Starting a Voice Call in Easy Mode If a field has been sent from the MCU to CT3258 before, and does not change in the next packet, this field can be omitted from the packet. For example, to redial a previous dial number, the MCU only needs to send the following packet to CT3258 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 89 Packet Header START_BYTES LENGTH TYPE Fields CALL_START Parity FBYTE PARITY_BYTE Table 2-2 Example of Redial Packet The call can be ended with a packet with CALL_STOP field. Packet Header START_BYTES LENGTH TYPE Fields CALL_STOP Parity FBYTE PARITY_BYTE Table 2-3 Example of Call Stop Packet 2.2.1.2 Receiving Upon receiving a call from the far end, CT3258 extracts useful information according to the DPMR protocol and reports to the MCU. The example below shows the packet sent to the MCU after receiving a new header frame. Packet Header START_BYTES LENGTH TYPE Fields CALL_HT_CI DPMR_CALLED_ID DPMR_OWN_ID DPMR_M_V_F_E DPMR_CC CALL_MATCH Parity FBYTE PARITY_BYTE Table 2-4 Example of Packet from DSP after Receiving a Call Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 90 The type of FIELD to report can be changed with REPORT_FIELD command. The fields can be sent in one packet or in multiple packets. 2.2.2 DPMR Layer 2 Mode With DPMR Layer 2 Mode, CT3258 support DPMR up to layer 2 the does not handle the call processing layer of the DPMR protocol. All call processing supports are provided by external MCU. In this case, CT3258 just performs the tasks of transporting DPMR related messages between the MCU’s of the two terminals. As a result, the following process will be performed by the MCU: Air Interface Call Control Layer (Layer 3) 1. Establishing, maintaining and termination of calls 2. Individual or group call transmission and receptions 3. Destination addressing 4. Automatic matching of Called ID of incoming call to own ID and group ID As comparison, these processes are completed by CT3258 with Easy Mode. With DPMR Layer 2 Mode, the MCU can access primitive elements of the DPMR architecture. For example, to start a call, the MCU send individual elements in the protocol to CT3258, with DPMR_SEND_HEADER and DPMR_SEND_SF, whereas in easy mode, the user sends a simple CALL_START to CT3258. With easy mode, the user also has the ability to change synchronization pattern with DPMR_FS1, DPMR_FS2, DPMR_FS3 and DPMR_FS4. 2.2.2.1 Transmitting In DPMR Layer 2 Mode, the MCU pass un-encoded HT, END and CCH frames, or individual information elements such as Called_ID or Own_ID to CT3258. CT3258 saves this information in the internal registers. Upon receiving a DPMR Packet with DPMR_SEND_HEADER, DPMR_SEND_END or DPMR_SEND_SF, the MCU performs channel coding and interleaving, forms the complete HI, END and Super Frame structure, and send to the far end. For example, upon receiving the DPMR Packet below, CT3258 builds a CCH0 to CCH3 structure. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 91 Packet Header START_BYTES LENGTH TYPE Fields DPMR_CCH_UE (0) DPMR_CCH_UE (1) DPMR_CCH_UE (2) DPMR_CCH_UE (3) Parity FBYTE PARITY_BYTE Table 2-5 Example 1 of a Packet from MCU in DPMR Layer 2 Mode Then if the MCU send a packet with DPMR_SEND_SF, it forms a super frame with the saved information, and sends it to the far end. Similarly the host message to build a HI frame and END frame can be like the one below: Packet Header START_BYTES LENGTH TYPE Fields DPMR_HI_UE Parity FBYTE PARITY_BYTE Table 2-6 Example of a HI Packet from MCU Packet Header START_BYTES LENGTH TYPE Fields DPMR_END_UE Parity FBYTE PARITY_BYTE Table 2-7 Example of END Packet from MCU 2.2.2.2 Receiving Upon receiving a Super Frame, Header Frame or an End Frame, CT3258 extracts the CCH0 – CCH3, HI or END fields, performs de-interleaving and channel decoding on the frames. CT3258 extracts individual elements to the MCU. The example below shows the packet sent to the MCU after receiving a new header frame. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 92 Packet Header START_BYTES LENGTH TYPE Fields DPMR_CALLED_ID DPMR_OWN_ID DPMR_M_F DPMR_HT_CI_PM Parity FBYTE PARITY_BYTE Table 2-8 Example of Packet from DSP after Receiving a Header Frame 2.3 DMR Call Processing CT3258 support two ways of processing digital calls: Easy Mode (Layer 3 Mode), DMR Layer 2 Mode. In Easy Mode (Layer 3 Mode), CT3258 digital mode support layer 1-3 processing of the DMR protocol complied with ETSI TS 102 361. The MCU uses simple DMR_CALL_START, CALL_STOP messages to start, stop a voice calls. In Layer 2 Mode, CT3258 implements Layer 1 and Layer 2 of the DMR protocol, complied with ETSI TS 102 361. Layer 3 and above are implemented on the MCU. The interface between CT3258 and the MCU are based on Layer 2 and Layer 3 interface. Note that if SCT3700 supported is enabled, only Layer 2 Mode is supported. 2.3.1 DMR Easy Mode In Easy Mode (Layer 3 Mode), the MCU uses simple DMR_CALL_START, CALL_STOP messages to start, stop a voice calls. Internally, CT3258 handles all call processing according the DMR Protocol. “ANNEX C of TS 102 361” numbering plan is implemented in CT3258. At the transmitter, CT3258 supports individual call and group call dialing. At the receiver, when a call is received, CT3258 matches incoming called number with its own individual call number and group number and informs the MCU of matching results. 2.3.2 DMR Layer 2 Mode In DMR Layer 2 Mode, CT3258 interacts with the control processor (the MCU) to complete the DMR voice and data calls. The layer 1 and layer 2 of the DMR are implemented in CT3258, while layer 3 and above are implemented in the MCU. The information exchange between the MCU and CT3258 is through DIGC_DATA_FRAME commands or indications. The MCU passes the data Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 93 types and the payload information the CT3258 through DIGC_DATA_FRAME to CT3258. CT3258 performs FEC according to the data types, CT3258 adds FEC, formulates them into 30 ms data burst and adds 4FSK modulation before sending to the far end. At the receiver, CT3258 decode the received data burst, and report to the MCU through DIGC_DATA_FRAME indications. In DMR Layer 2 mode, care must be taken to make sure that the DIGC_DATA_FRAME messages are sent no more and no less than 60 millisecond at a time. Examples of layer 2-3 message exchange are described in the example session below. Two types of commands are used by the MCU to control CT3258. The first type is hardware related for configuring CT3258 in certain mode ready for communication. The second type is protocol related, where commands are used to pass layer 2 and layer 3 information. In particular DIGC_DATA_FRAME command is used to start or stop a voice or data call. 2.3.3 DMR MS Call Flow The diagram below shows at typical DMR voice call from one mobile station to another mobile station without a repeater. MCU MS1 Transmiter MS2 Receiver 3928 3928 MCU call up data frame (LC Header) response data frame (LC Header) data frame (surperframe) response Voice call data frame (surperframe) LC header Super Frame next ..... call Down data frame (LC Terminal) response data frame (LC Terminal) LC Terminal Figure 2-1 DMR MS Call Flow Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 94 The MCU informs CT3258 the types of data frame to send through command DMR_DATA_FRAME and then waits for response from CT3258. CT3258 put the data frame for transmission and sends a response in the form of (0x17 0x0a). The next DMR_DATA_FRAME won’t be sent unless a response (0x17 0x0A) is received. The interval between two DMR_DATA_FRMAE is around 60 milliseconds. Only one DMR_DATA_FRAME command with LC contents is needed to start the voice communication at the TX side. The subsequent super frames use the same LC contents. Similarly, DMR_DATA_FRAME is only reported once upon receiving super frames at the RX side. The MCU knows the call end condition from either by receiving a terminal frame, or by receiving CT3258 response of 1B 08. 2.3.4 Base Station Activation In order to place voice or data calls through the base station or repeater, the mobile station should first acquire synchronization by monitor signals from the base station. If the base station is in idle state, the mobile station should first send a base station activation message to activate the base station. This is done by MCU sending a DMR_DATE_FRAME with CSBK contents. The diagram below shows the base station activation procedure. MCU MS Transmiter BS UpLink 3928 call up data frame (CSBK) response CSBK BS Down link Actived MS Receiver Figure 2-2 Base Station Activation 2.3.5 Listen Before Transmitting If the base station is activated, it constantly broadcasts base station signals. The mobile station should first acquire timing synchronization from the base station before it can start or receive a call. Timing synchronization is done by monitoring the SYNC pattern and the CACH signals from the base station. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 95 The MCU on the mobile station first sends command DMR_CALL_SLOT to inform CT3258 which slot to monitor, and waits CT3258 for DMR_SLOT_FOUND response. As soon as CT3258 acquire synchronization, it sends DMR_SLOT_FOUND response, first with slot verified flag unset, then after the preset number of CACH is received, with the slot verified flag set. At this point, the mobile station is aligned with the base station. CT3258 can report any data frames from the far end through DMR_DATA_FRAME message. The MCU can also issue DMR_DATA_FRAME command to CT3258 to send to the far end. The diagram below shows a timing acquisition process. slot 2 slot 1 c a c h BS Down Link MS Receive c a c h slot 2 slot 1 c a c h c a c h slot 2 slot 1 c a c h SLOT FOUND c a c h Receive Transmit Receive Receive RF_TIMING PORT RF Ttransmit Control (MCU Generate) Close Open Close Open Close Open MS Ttransmit slot 1 (Invalid) slot 2 (valid) slot 1 (Invalid) slot 2 (valid) slot 1 (Invalid) slot 2 (valid) Offset Transmit Transmit SLOT_TIMING (SCT3928 Internal) Slot 1 Slot 2 Slot 1 Slot 2 Slot 1 Slot 2 SLOT FOUND Done Figure 2-3 Signal Timing Relationship After CT3258 acquires synchronization from the base station, it generates an internal 60 millisecond cyclic timing signal, SLOT_TIMING. In the TX mode, CT3258 controls the timing on the modulation output port so that it is in synchronization with the base station timing. In the meantime, it also outputs a SLOT_TIMING signal through the RF_TIMING port to control the RF circuit. The RF_TIMING signal can be identical to the SLOT_TIMNG. It can also be ahead or lag the SLOT_TIMING signal. The offset are programmable through command DMR_OFFSET. The MCU can then generate necessary timing signals to control the RF transceiver and the power amplifier. In the case of SCT3700, the switching of RF transceiver and controlled by the CT3258. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 96 2.4 Typical Call Sessions with CT3258 in DPMR Mode 2.4.1 Digital Voice Call A voice call involves the transmitter and the receiver. In both side, the MCU is the main controller, controlling the RF circuit, the MMI and CT3258. Before the call, the MCU should set the RF circuit in TX mode for the transmitter and in RX mode for the receiver. The sub-section below only describes the interaction between the MCU and CT3258. 2.4.1.1 Initial Setting for both the Transmitter and the Receiver 1. Set Vocoder type with VOCODER_SEL 2. Set CT3258 to Easy mode with PROCESS_MODE command 3. Set Color Code corresponding to the RF Channel with DPMR_CC command 4. Set addressing mode to either “Initial Address Mode” or “Configured Addressing Mode” with ADDRESS_MODE command 5. Set Own ID with DIGC_OWN_ID_BIN or DPMR_OWN_ID_BCD (“Configured Addressing Mode” only) 2.4.1.2 Initial Setting for the Receiver 1. Set the demodulator gain with DEMOD_GAIN command 2. Set the types of field to report when receiving a call with REPORT_FIELD command 2.4.1.3 Initial Setting for the Transmitter 1. Set the modulator gain with MOD_GAIN command 2.4.1.4 Transmitter Side, Start a Call 1. Set CT3258 in TX or DUPLEX with WORK_MODE command 2. Set called ID and own ID with DPMR_CALLED_ID and DPMR_OWN_ID 3. Start the call with CALL_START, for peer-to-peer voice call 2.4.1.5 Receiver Side, Start a Call 1. Set CT3258 in RX or DUPLEX with WORK_MODE command 2. When detecting carrier, inform CT3258 that carrier is ready with CARRIER_READY command After the call from transmitter arrives, CT3258 reports useful information. The MCU decides Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 97 whether to accept or discard the call. 2.4.1.6 Transmitter Side, End a Call 1. Drop the call with CALL_STOP command 2. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.4.1.7 Receiver Side, End a Call 1. Drop the carrier with CARRIER_READY command 2.4.2 Voice Call with Slow Data 1. Start the call the same way as voice only call described in the previous section except that the communication mode(the M in M_V_F_EP) is set to Call with Slow Data 2. After the calls start, the MCU first send a packet with DPMR_SLD field. 3. When CT3258 begin transmitting, it fills slow data in the super frame and transmits slow data along with the voice frames. As soon as the slow data is being transmitted, it sends a DPMR_SLD response packet to the MCU, at 80 millisecond interval. Packet Header START_BYTES LENGTH TYPE (Read Near End) Fields DPMR_SLD Parity FBYTE PARITY_BYTE Table 2-9 Example Packet for Request Near End Slow Data 4. Upon receiving DPMR_SLD response, the MCU write DPMR_SLD to CT3258, also at 80 millisecond interval. 5. At the receiver, upon receiving super frame with SLOW data, CT3258 extract slow data and report to the MCU with DPMR_SLD packet at 80 millisecond interval. 6. When all data has been transmitted, the MCU has to wait the response packet of the last frame DPMR_SLD. 7. Drop the call with CALL_STOP command 8. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.4.3 Voice Call Recording 1. Enable voice recording function with command VOCODER_IO_SET at the transmitter for near end voice call recording (IO_SET = 0x20), or at the receiver for far end voice call recording (IO_SET = 0x04) Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 98 2. Start the call the same way as voice only call described in the previous section. 3. When the call starts, CT3258 start to send encoded voice data with CHAN_D field, at 80 millisecond interval. Packet Header START_BYTES LENGTH TYPE (Read Near End) Fields CHAN_D Parity FBYTE PARITY_BYTE Table 2-10 Example Packet for Voice Recoding 4. Upon receiving CHAN_D, the MCU should process the message and save its contents. The MCU does not send a response to CHAN_D. 5. The process repeats at 80 millisecond interval. 6. Drop the call with CALL_STOP command 7. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 8. Disable the voice recording by setting IO_SET = 0x00 2.4.4 Voice Call Play Back 1. Enable voice play back function with command VOCODER_IO_SET at the transmitter for far end voice play back (IO_SET = 0x40), or at the receiver for near end voice play back (IO_SET = 0x08) 2. Start the call the same way as voice only call described in the previous section. 3. When the call starts, MCU starts to send encoded voice data with CHAN_D field, at 80 millisecond interval. Packet Header START_BYTES LENGTH TYPE (Read Near End) Fields CHAN_D Parity FBYTE PARITY_BYTE Table 2-11 Example Packet for Play Back 4. Upon receiving CHAN_D, CT3258 send back the response to CHAN_D. 5. The process repeats at 80 millisecond interval. 6. Drop the call with CALL_STOP command 7. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 8. Disable the voice recording by setting IO_SET = 0x00 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 99 2.4.5 Data Call with Type 1 or Type 2 Data 1. Start the call the same way as voice only call described in the previous section except that the communication mode (the M in M_V_F_EP) is set to Type 1 or Type 2 data call. The DPMR_HT_CI has to be configured as section 1.2.53. 2. After the calls start, the MCU first send a packet with DIGC_DATA_FRAME field, which includes up to 36 bytes (in 80 ms) of data. In the DIGC_DATA_FRAME fields, user should also indicate whether valid data are present and the length of the valid data. The user should also indicate whether this is the last data frame. 3. When CT3258 begin transmitting, it fills data in the TCH frame and starts transmitting data. As soon as data is being transmitted, it sends a DIGC_DATA_FRAME response packet to the MCU, at 80 millisecond interval. Packet Header START_BYTES LENGTH TYPE (Read Near End) Fields DIGC_DATA_FRAME Parity FBYTE PARITY_BYTE Table 2-12 Example Packet for Request Near End Type 1 and Type 2 Data 4. Upon receiving DPMR_DTAT_FRAME response, the MCU write DIGC_DATA_FRAME with more data to CT3258, also at 80 millisecond interval. 5. At the receiver, upon receiving DPMR pay load, CT3258 extracts data from TCH frames and report to the MCU with DIGC_DATA_FRAME packet at 80 millisecond interval. 6. When all data has been transmitted, the MCU responds to data query with DIGC_DATA_FRAME with indication that no more data is to transmit. 7. Drop the call with CALL_STOP command 8. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.4.6 Voice Call with Appended Data The Voice Call with Appended Data starts as voice call and ends as a Type 2 Data Call. 1. Start the call the same way as voice only call described in the previous sections except that the communication mode(the M in M_V_F_EP) is set to Voice Call with Appended Data. The DPMR_HT_CI has to be configured as section 1.2.53. 2. Proceed to voice communication as a normal voice call 3. When the user releases the PTT, the MCU first send a packet with DIGC_DATA_FRAME field, which includes up to 36 bytes (in 80 ms) of data. In the DIGC_DATA_FRAME fields, user should also indicate whether valid data are present and the length of the valid data. The user should also indicate whether this is the last data frame. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 100 4. When CT3258 begin transmitting, it fills data in the TCH frame and starts transmitting data. As soon as data is being transmitted, it sends a DIGC_DATA_FRAME response packet to the MCU, at 80 millisecond interval. 5. Upon receiving DPMR_DTAT_FRAME response the MCU write DIGC_DATA_FRAME with more data to CT3258, also at 80 millisecond interval. 6. At the receiver, upon receiving DPMR pay load, CT3258 extracts data from TCH frames and report to the MCU with DIGC_DATA_FRAME packet at 80 millisecond interval. 7. When all data has been transmitted, the MCU responds to data query with DIGC_DATA_FRAME with indication that no more data is to transmit. 8. Drop the call with CALL_STOP command 9. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.4.7 Data Call Type 3 (for future release) Type 3 Data calls involve a call set up and disconnect procedure as described below: 1. Station A: Send connection request 2. Station B: Send ACK 3. Station A: Send data frames 4. Station B: Send ACK 5. Station A: Send more data frames 6. Station B: Send ACK … 7. Station A: Send Disconnect request The interactions of MCU and CT3258 to complete a data call are described below. 2.4.7.1 Initialization of Data Call Type 3 The initialization of Type3 data call is the same as voice calls. 2.4.7.2 Connection Request 1. Set Station A in TX mode and Station B in RX mode with WORK_MODE command 2. Set call information (CI) for appropriate data format with DPMR_CI_PM command 3. Send CONNECT command in station A 4. Set Carrier Ready in station B 5. CT3258 in station B report HT_CI to station B MCU 6. Station B MCU becomes aware of a data call request, and get ready to send an ACK 7. When the CONNECT message is sent out in station A, CT3258 responds with ACK_MESSAGE (10) Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 101 2.4.7.3 Connection Acknowledge 1. Set Station B in TX mode and Station A in RX mode with WORK_MODE command 2. Set CI to indicate ACK or NACK (with NACK reason) with DPMR_CI_PM. 3. Send DPMR_ACK command in station B 4. Set Carrier Ready in station A 5. CT3258 in station A report HT_CI to the MCU 6. Station A MCU becomes aware of the acknowledgement from station B, and get ready to send data. 7. When the Connect Acknowledgement message is sent out in station B, CT3258 responds with ACK_MESSAGE (10) 2.4.7.4 Sending Type 3 Data Frames 1. Set Station A in TX mode and Station B in RX mode with WORK_MODE command 2. Set CI for appropriate data format with DPMR_CI_PM command 3. Start the call with CALL_START 4. After the calls start, the MCU first send a packet with DIGC_DATA_FRAME field with Type 3 data indication, which includes up to 48 bytes (in 80 ms) of data. In the DIGC_DATA_FRAME fields, user should also indicate whether valid data are present and the length of the valid data. The user should also indicate whether this is the last data frame. 5. CT3258 fills data in the data frame and start transmission. As soon as data is being transmitted, it sends a DIGC_DATA_FRAME query packet to the MCU to request for more data. This process continues at 80 milli-second interval. 6. Upon receiving DIGC_DATA_FRAME query, the MCU write DIGC_DATA_FRAME to CT3258, also at 80 millisecond interval. 7. At station B, upon receiving data frames, CT3258 extract data and report to the MCU with DIGC_DATA_FRAME packet at 80 millisecond interval. 8. Station B MCU assembles the data frames from the DIGC_DATA_FRAME fields. 9. When all data in current data frame has been transmitted, the MCU responds to data query with DIGC_DATA_FRAME with indication that no more data is to transmit. 10. Drop the call with CALL_STOP command 11. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.4.7.5 Data Acknowledgement 1. Set Station B in TX mode and Station A in RX mode with WORK_MODE command 2. Set CI to indicate ACK or NACK (with NACK reason) with DPMR_CI_PM. 3. Send DPMR_ACK command in station B 4. Set Carrier Ready in station A 5. CT3258 in station A report HT_CI to the MCU 6. Station A MCU becomes aware of the acknowledgement from station B, and get ready to send more data packet. 7. When the Data Acknowledgement message is sent out in station B, CT3258 responds with Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 102 ACK_MESSAGE (0x17 0x0A) to MCU B. 2.4.7.6 Disconnect 1. Set Station A in TX mode and Station B in RX mode with WORK_MODE command 2. Send DISCONNECT command in station A. 3. Set Carrier Ready in station B 4. CT3258 in station B report HT_CI to the MCU 5. Station B MCU becomes aware of the Disconnect request from station A, and start disconnect procedure 6. Station B disconnect the cal 7. When the DISCONNECT message is sent out in station A, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.4.8 Short Appended Data (TS 102 658 Only) ETSI TS 102 658 defines a special message for transmitting short data. It is constructed by a connection request HEADER frame, one to four appended data frames, and an END frame. To send Short Appended Data, the MCU can follow the procedure below. 2.4.8.1 Send Short Appended Data Set Station A in TX mode with WORK_MODE command 1. Set call information (CI) for appropriate data format with DPMR_CI_PM command 2. Send the contents of the short appended data with DIGC_DATA_FRAME command with type set to Short Appended Data. 3. Send SEND_AD command in station A 4. When the CONNECT message is sent out in station A, CT3258 responds with ACK_MESSAGE (10) 5. The MCU set Station A in RX mode to get ready to receive an ACK. 2.4.8.2 Receive Short Appended Data 1. Set Station B in RX mode with WORK_MODE command 2. Set Carrier Ready in station B 3. CT3258 in station B receives short appended data and report to station B MCU with DIGC_DATA_FRAME 4. Set Station B in TX mode to get ready to send an ACK. 2.4.9 Analog Voice Call in DPMR Mode CT3258 support dual mode operation with digital and analog calls. For analog call, CT3258 supports CTCSS/DCS sub-audio signals. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 103 2.4.9.1 Receiver Side, Start a Call 1. Set CT3258 to analog call mode with PROCESS_MODE command 2. Set CT3258 in RX or DUPLEX with WORK_MODE command 3. Set CTCSS/DCS settings with SUB_AUDIO command 4. When detecting carrier, inform CT3258 that carrier is ready with CARRIER_READY After the call from transmitter arrives, CT3258 reports whether CTCSS/DCS is matched or not with SUB_AUDIO command. 2.4.9.2 Transmitter Side, Start a Call 1. Set CT3258 to analog call mode with PROCESS_MODE command 2. Set CT3258 in TX or DUPLEX with WORK_MODE command 3. Set CTCSS/DCS settings with SUB_AUDIO command 4. Start the call with CALL_START command 2.4.9.3 Receiver Side, End a Call 1. Drop the carrier with CARRIER_READY command 2.4.9.4 Transmitter Side, End a Call 1. Drop the call with CALL_STOP command 2.4.10 Handling of Maintenance Message (TS 102 658 Only) With ETSI TS 102 658, the BS may send multiple maintenance messages such as preservation messages, Idle messages or Guard messages. CT3258 may report each occurrence of these messages, or elect to only report the same message once to save traffic between CT3258 and the MCU. The election is controlled by command DPMR_PROTOCOL_OPTION. 2.4.11 Automatic Analog and DPMR Call Detection To set up for automatic analog and DPMR call detection, the receiver is set up the same ways as a digital calls, with the following exceptions: 1. Set CT3258 to Easy mode with PROCESS_MODE command, with mixed call bit enabled: i. e., the process mode as 131. 2. Set CTCSS/DCS settings with SUB_AUDIO command The transmitter side is set up exactly as normal analog or DPMR call. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 104 With automatic analog and DPMR call detection, CT3258 monitors the RF channel, and simultaneously detects FS1/FS2 pattern for DPMR calls, and CTCSS/DCS signaling for analog calls. If DPMR call is found, it sends CALL_MATCH message (even if the called ID or CC code does not match). If CTCSSS/DCS signaling is found, it send SUB_AUDIO message. 2.4.12 Audio Muting for Un-matched Calls By defaults, CT3258 enables audio as soon as a DPMR or an analog call is received, even if called ID or CTCSS/DCS code does not match. It is up to the MCU to decide whether to take the call or not. If the MCU decides to take to call, it enables audio PA. If not, it turns off the audio PA, and send carrier lost to CT3258. Optionally, the CT3258 can mute the audio until a correct call match is achieved. This can be done by setting Mute Flag when sending the Carrier Ready command at the receiver. When Mute Flag is set, CT3258 sends zeros to its audio out line until a called ID of the incoming call matches the own ID of itself, or the CTCSS/DCS code of the transmitter and receiver match. 2.5 Typical Call Sessions with CT3258 in DMR Mode 2.5.1 DMR Voice Call in DMR Easy Mode A voice call involves the transmitter and the receiver. In both side, the MCU is the main controller, controlling the RF circuit, the MMI and CT3258. Before the call, the MCU should set the RF circuit in TX mode for the transmitter, and in RX mode for the receiver. The sections below only describe the interaction between the MCU and CT3258. Note that if SCT3700 support is enabled, DMR Easy mode is not supported. 2.5.1.1 Initial Setting for both the Transmitter and the Receiver 1.Set Vocoder type with VOCODER_SEL, 4 for AMBE+2 Command ID: VOCODER_SEL Send Command: 84 A9 61 00 02 00 10 04 Receive Data:84 A9 61 00 02 00 10 00 2.Set CT3258 to digital mode with PROCESS_MODE command Command ID: PROCESS_MODE Send Command: 84 A9 61 00 02 00 1A 03 Receive Data:84 A9 61 00 02 00 1A 00 3.Set Color Code corresponding to the RF Channel with DMR_CC command Send Command: 84 A9 61 00 02 08 77 01 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 105 Receive Data:84 A9 61 00 02 08 77 00 4.Configure the call option with DMR_CALL_OPTION Command ID: DMR_CALL_OPTION Send Command: 84 A9 61 00 06 08 79 41 00 00 00 00 Receive Data:84 A9 61 00 02 08 79 00 (In this particular command, CT3258 is set to do SQ detection; slotted mode is used, with unused slot filled with zeros; SLOT verified number is 1). 5.Set Own ID with DIGC_OWN_ID_BIN or DMR_OWN_ID_BCD Command ID: DIGC_OWN_ID_BIN Send Command: 84 A9 61 00 04 08 50 XX XX XX Receive Data:84 A9 61 00 02 08 50 00 2.5.1.2 Initial Setting for the Receiver 1. Set the demodulator gain with DEMOD_GAIN command 2. Set the types of field to report when receiving a call with REPORT_FIELD command Command ID: REPORT_FIELD Send command: 84 A9 61 00 02 00 1D XX Receive Data: 84 A9 61 00 02 00 1D 00 2.5.1.3 Initial Setting for the Transmitter 1. Set the modulator gain with MOD_GAIN command 2.5.1.4 Transmitter Side, Start a Call 1.Set CT3258 in TX with WORK_MODE command Command ID: WORK_MODE Send Command: 84 A9 61 00 04 00 18 02 00 00 Receive Data: 84 A9 61 00 02 00 18 00 2.Set called ID and own ID with DIGC_CALLED_ID and DIGC_OWN_ID Command ID: DIGC_OWN_ID_BIN Send Command: 84 A9 61 00 04 08 50 XX XX XX Receive Data: 84 A9 61 00 02 08 50 00 Command ID: DMR_CALLED_ID_BIN Send Command: 84 A9 61 00 04 08 51 XX XX XX Receive Data: 84 A9 61 00 02 08 51 00 3.Set FLC information Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 106 Command ID: DMR_FLC Send Command: 84 A9 61 00 04 08 76 00 00 00 Receive Data:84 A9 61 00 02 08 76 00 (In this particular command, FLCO as group call, FID is standard) 4.Start the call with DMR_CALL_START, for peer-to-peer voice call Command ID: DMR_CALL_START Send Command: 84 A9 61 00 01 08 78 receive command: 84 a9 61 00 02 08 78 00 2.5.1.5 Receiver Side, Start a Call 1.Set CT3258 in RX or DUPLEX with WORK_MODE command Command ID: WORK_MODE Send Command: 84 A9 61 00 04 00 18 01 00 00 Receive Data:84 A9 61 00 02 00 18 00 2.When detecting carrier, inform CT3258 that carrier is ready with CARRIER_READY command Send Command: 84 A9 61 00 02 00 19 {0x01 or 0x02} Receive Data:84 A9 61 00 02 00 19 00 After the call from transmitter arrives, CT3258 reports useful information. The MCU decides whether to accept or discard the call. 2.5.1.6 Receiver Side, after a Call is Received Receive Data:84 A9 61 00 02 30 7F 87  DMR_SLOT_FOUND message. The content is TACT in the CACH, BS call, SLOT verify not completed Receive Data:84 A9 61 00 02 30 1B 04  Indicate voice SYNC is received Receive Data:84 A9 61 00 02 30 7B 11  DMR_SLOT_TYPE message. CC is 1. Data type is Voice LC Header Receive Data:84 A9 61 00 04 30 76 00 00 00  DMR_FLC message Receive Data:84 A9 61 00 04 30 50 xx xx xx  DIGC_CALLED_ID_BIN Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 107 Receive Data:84 A9 61 00 04 30 51 xx xx xx  DIGC_OWN_ID_BIN Receive Data:84 A9 61 00 05 30 7D xx xx xx xx  DIGC_CALLED_ID_BCD Receive Data:84 A9 61 00 05 30 7E xx xx xx xx  DIGC_OWN_ID_BCD Receive Data:84 A9 61 00 02 30 27 00  CALL_MATCH message, indicating a valid DMR call is received, and called ID and CC are matched. 2.5.1.7 Transmitter Side, End a Call 1. Drop the call with CALL_STOP command Command ID: DMR_CALL_STOP Send Command: 84 A9 61 00 01 03 21 receive command: 84 A9 61 00 02 03 21 00 2. When the END message is sent out, CT3258 responds with ACK_MESSAGE (0x17 0x0A) 2.5.1.8 Receiver Side, End a Call When the transmitter stops the call, CT3258 receives LC terminator from the far end, and report it with DMR_SLOT_TYPE to the MCU. Receive Data:84 A9 61 00 02 30 7B 11  DMR_SLOT_TYPE message. CC is 1. Data type is Voice LC Terminator. 2. After receiving DMR_SLOT_TYPE, the receiver can then drop the carrier with CARRIER_READY command Command ID: DMR_CARRIER_READY Send Command: 84 A9 61 00 02 00 19 00 Receive Data:84 A9 61 00 02 00 19 00 2.5.2 DMR Voice Call in DMR Layer 2 Mode A voice call involves the transmitter and the receiver. In both side, the MCU is the main controller, controlling the RF circuit, the MMI and CT3258. Before the call, the MCU should set the RF circuit in TX mode for the transmitter and in RX mode for the receiver. The sub-section below only describes the interaction between the MCU and CT3258. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 108 2.5.2.1 Initial Setting for both the Transmitter and the Receiver 1. Set Vocoder type with VOCODER_SEL. An up to 2-3 seconds delay is required to down load the vocoder from the flash. Command ID: VOCODER_SEL Send Command: 84 A9 61 00 02 00 10 04 Receive Data:84 A9 61 00 02 00 10 00 2. Set CT3258 to layer 2 mode with PROCESS_MODE command Command ID: PROCESS_MODE Send Command: 84 A9 61 00 02 00 1A 02 Receive Data:84 A9 61 00 02 00 1A 00 3. Set Color Code corresponding to the RF Channel with DMR_CC command Command ID: DMR_CC Send Command: 84 A9 61 00 02 08 77 01 Receive Data:84 A9 61 00 02 08 77 00 4. Set DMR call options with DMR_CALL_OPTION command Command ID: DMR_CALL_OPTION Send Command: 84 A9 61 00 06 08 79 41 00 10 00 00 Receive Data:84 A9 61 00 02 08 79 00 (In this particular command, CT3258 is set to do SQ detection; slotted mode, with unused slot filled with zeros; SLOT verified number is 1). 2.5.2.2 Initial Setting for the Receiver  Set the demodulator gain with DEMOD_GAIN command  Set the types of field to report when receiving a call with REPORT_FIELD command 2.5.2.3 Initial Setting for the Transmitter 1. Set the modulator gain with MOD_GAIN command 2.5.2.4 Receiver Side, Start a Call 1. Set CT3258 in RX or DUPLEX with WORK_MODE command Command ID: WORK_MODE_RX Send Command: 84 A9 61 00 04 00 18 01 00 00 Receive Data:84 A9 61 00 02 00 18 00 2. Set which slot to receive with DMR_CALL_SLOT command Send Command: 84 A9 61 00 02 08 6F 01 Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 109 Receive Data:84 A9 61 00 02 08 6F 00 (For mobile to mobile call, the slot number is 0) 3. When detecting carrier, inform CT3258 that carrier is ready with CARRIER_READY command Command ID: DMR_CARRIER_READY Send Command: 84 A9 61 00 02 00 19 {0x01 or 0x02} Receive Data:84 A9 61 00 02 00 19 00 After the call from transmitter arrives, CT3258 reports useful information. The MCU decides whether to accept or discard the call. 2.5.2.5 Transmitter Side, Start a Call 1. Set which slot to transmit with DMR_CALL_SLOT command. If MS call is to be placed, the slot number is 0. Otherwise, slot 1 or slot 2 is selected Command ID: DMR_CALL_SLOT Send Command: 84 A9 61 00 02 08 6F 81 Receive Data: 84 A9 61 00 02 08 6F 00 2. Set CT3258 in TX mode with WORK_MODE command Command ID: WORK_MODE_TX Send Command: 84 A9 61 00 04 00 18 02 00 00 Receive Data: 84 A9 61 00 02 00 18 00 3. Send LC with DIGC_DATA_FRAME (CC can be sent in the same packet) Command ID: DIGC_DATA_FRAME Send Command: 84 A9 61 00 0E 08 77 01 43 01 09 00 00 00 00 00 01 00 00 01 Receive Command: 84 A9 61 00 01 20 43 4. Start the call by sending super frame with DIGC_DATA_FRAME Command ID: PROTOCOL_DATA_FRAME Send Command: 84 A9 61 00 0E 08 77 01 43 11 09 00 00 00 00 00 01 00 00 01 Receive Command: 84 A9 61 00 01 20 43 2.5.2.6 Receiver Side, after a Call is Received Receive Data: 84 A9 61 00 02 30 7F 87  DMR_SLOT_FOUND message. The content is TACT in the CACH, BS call, SLOT verify not completed Receive Data:84 A9 61 00 02 30 7F A9  DMR_SLOT_FOUND message. The content is TACT in the CACH, BS call, SLOT verify completed, with no need to invert slot numbers in previous DMR_SLOT_FOUND Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 110 message. At this point, the mobile station is synchronized with the base station. If the mobile station wishes to start a call, it needs to check the AT bit in the TACT of CACH, and proceed if it is not busy. Receive Data: 84 A9 61 00 0E 30 77 01 43 01 09 00 00 00 00 00 01 00 00 01  This message contains two fields, DMR_CC and DIGC_DATA_FRAME. CC is 0x01. The content in the data frame is data burst at SLOT1, length of 9, and Voice LC header. Receive Data: 84 A9 61 00 0E 30 77 01 43 11 09 00 00 00 00 00 01 00 00 01  This message contains two fields, DMR_CC and DIGC_DATA_FRAME. CC is 0x01. The content in the data frame is voice super frame at SLOT1, length of 9, and Voice LC header. Once CT3258 receives and reports one voice super frame, it won’t report subsequent voice super frame. But it continues to track the synchronization of the base station, and report 0x1B 0x08 if the synchronization is lost, which the MCU can use as an indication of call lost. 2.5.2.7 Transmitter Side, End a Call 1. Stop the call by sending Terminator LC. Once CT3258 has sent all message to the far end, it reports 17 0A to the MCU Command ID: PROTOCOL_DATA_FRAME Send Command: 84 A9 61 00 0c 08 43 02 09 00 00 00 00 00 01 00 00 01 Receive Command: 84 A9 61 00 01 20 43 Receive Command: 84 A9 61 00 02 20 17 0A 2.5.2.8 Receiver Side, End a Call When the transmitter stops the call, CT3258 receives LC terminator from the far end, and report it with DIGC_DATA_FRAME to the MCU Receive Data:84 A9 61 00 0E 30 77 01 43 02 09 00 00 00 00 00 01 00 00 01  This message contains two fields, DMR_CC and DIGC_DATA_FRAME. CC is 0x01. The content in the data frame is data burst at SLOT1, length of 9, and Voice LC Terminator. 1. Drop the carrier with CARRIER_READY command Command ID: DMR_CARRIER_READY Send Command: 84 A9 61 00 02 00 19 00 Receive Data:84 A9 61 00 02 00 19 00 2.5.3 Analog Voice Call in DMR Mode CT3258 support dual mode operation with digital and analog calls. For analog call, CT3258 supports CTCSS/DCS sub-audio signals. Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 111 2.5.3.1 Receiver Side, Start a Call 1. Set CT3258 to analog call mode with PROCESS_MODE command 2. Set CT3258 in RX or DUPLEX with WORK_MODE command 3. Set CTCSS/DCS settings with SUB_AUDIO command 4. When detecting carrier, inform CT3258 that carrier is ready with CARRIER_READY After the call from transmitter arrives, CT3258 reports whether CTCSS/DCS is matched or not with SUB_AUDIO command. 2.5.3.2 Transmitter Side, Start a Call 1. Set CT3258 to analog call mode with PROCESS_MODE command 2. Set CT3258 in TX or DUPLEX with WORK_MODE command 3. Set CTCSS/DCS settings with SUB_AUDIO command 4. Start the call with DMR_CALL_START command 2.5.3.3 Receiver Side, End a Call 1. Drop the carrier with CARRIER_READY command 2.5.3.4 Transmitter Side, End a Call 1. Drop the call with CALL_STOP command 2.6 Gain Calibration This is the first step of calibration. It calibrates the receiver path to calculate SQ_LEVEL correctly without being affected by gains variation in the analog path.. For SCT3700, follow these steps: 1. Feed -60dbm FM signal (eg. by HP8920) to receiver and make chip run in receiver mode 2. Adjust “GAIN_ADJUST” till WB_RSSI equals to -60dbm Note that if external LNA is used, it needs to be disable when doing GAIN calibration. Command ID: READ_RSSI Send Command: 84 A9 61 00 01 20 6C 00 Receive Data: 84 A9 61 00 07 23 6C 00 3B 00 37 00 00 For example, 0x3B-137 = -78dbm, which means there is -18db mismatch. So we set GAIN_ADJUST to 0xee, and send Command ID: WRITE_RSSI Packet Interface of CT3258 Copy Rights © 2015, Wuxi Sicomm Communication Technologies, Inc & Celetra, Inc 112 Send Command: 84 A9 61 00 0D 00 6C EE 00 00 30 10 00 04 00 10 00 04 00 Receive Data:84 A9 61 00 02 00 6C 00 After that when we read again, it results, Command ID: READ_RSSI Send Command: 84 A9 61 00 01 20 6C 00 Receive Data: 84 A9 61 00 07 23 6C 00 4C 00 36 00 00 This time 0x4c-137 = -61dbm is almost correct, +/-1db is ignorable. 3. Enable external LNA if it is used Command ID: 3700CONFIG Send Command: 84 A9 61 00 03 00 6D 0F 00 00 Receive Data:84 A9 61 00 02 00 6D 00 4. Adjust “EXT LNA_GAIN” till WB_RSSI equals to -60dbm Command ID: readrssi Send Command: 84 A9 61 00 01 20 6C 00 Receive Data: 84 A9 61 00 07 23 6C 00 6D 00 18 00 00 0x6D-137 = -28dbm, which means 32db mismatch. So we set EXTLNA_VAL[5:0]=0x20, EXTLNA_VAL[7:6]=3 which is determined by 0x20-(0x4C-0x3B)=15dB Bit7-Bit6 Value 11 12