SYN-TECH III P25 PORTABLE RADIO
SERVICE MANUAL
3-6
Table 3-1: KN1, RF and Control PCB to DSP PCB Signals
POSITION DEFINITION FUNCTION
KN1-1 SSP_CE_WR Microprocessor WRITE signal
KN1-2 BAT7V5 Unswitched, direct battery voltage
KN1-3 DSP_CS Select microprocessor’s DSP data
KN1-4 SW7V5 Switched battery voltage
KN1-5 RD Microprocessor RD signal
KN1-6 DSP_RESET RESET signal from microprocessor to digital board
KN1-7 CIK One bite communication signal that goes to CIK module
KN1-8 DSP_MC_IRQ Interrupt data that comes to microprocessor from digital board
KN1-9 RDY Microprocessor RDY signal
KN1-10 12.288MHz 12.288MHz clock signal
KN1-11 GND Ground
KN1-12 DIG_TX_AUDIO Audio signal that will be transmitted after coded
KN1-13 SENSE Sense data
KN1-14 SK_RX_AUDIO Decoded audio signal
KN1-15 D1 Microprocessor parallel data signal
KN1-16 EMERGENCY Emergency call signal
KN1-17 A1 Microprocessor address signal
KN1-18 CLEAR Clear signal data received from keypad
KN1-19 A2 Microprocessor address signal
KN1-20 D2 Microprocessor parallel data signal
KN1-21 A3 Microprocessor address signal
KN1-22 D3 Microprocessor parallel data signal
KN1-23 A0 Microprocessor address signal
KN1-24 D7 Microprocessor parallel data signal
KN1-25 BB_MODEM_RX Base band signal received from receiver
KN1-26 D6 Microprocessor parallel data signal
KN1-27 D0 Microprocessor parallel data signal
KN1-28 D5 Microprocessor parallel data signal
KN1-29 BB_MODEM_TX Base band signal that goes to transmitter
KN1-30 D4 Microprocessor parallel data signal
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