Sony CDX-GT878US - Page 34

CDX-GT828U/GT870US/GT878US
34
• IC Pin Function Descriptions
MAIN BOARD (4/4) IC303 M30626FHPA15GP (SYSTEM CONTROL)
Pin No. Pin Name I/O Description
1 DST_SEL0 I
Destination/unit setting pin (L: FM (200k)/AM (10k), H: FM (50k)/AM (9k) (CDX-GT870US/
GT878US only))
2 FSW-IN I DC-DC converter oscillation frequency count signal input
3 UNI_SO O SONY-BUS data signal output
4 UNI_SI I SONY-BUS data signal input
5 UNI_CKO O SONY-BUS clock signal output
6 BYTE I Connect to VSS. (Fixed at L)
7 CNVSS I Flash writer signal input (L: normally operation, H: writer mode)
8 XCIN I Sub-clock signal input (32.768 kHz)
9 XCOUT O Sub-clock signal output (32.768 kHz)
10 RESET I Reset signal input
11 XOUT O Main-clock signal output (6 MHz)
12 VSS ― Ground
13 XIN I Main-clock signal input (6 MHz)
14 VCC1 ― Power supply pin (+3.3 V)
15 NMI I Nonmaskable interruption signal input (Fixed at H)
16 CDM_ON I CD mechanism deck power control request signal input
17 DAVN I RDS data block synchronized detection signal input (CDX-GT828U only)
18 TUNER ATT-IN I Tuner mute zero cross detection signal input (CDX-GT828U only)
19 NS-MASK O Noise mask signal output (CDX-GT828U only)
20 BEEP O Beep signal output
21 TUNER ATT O Tuner mute control signal output
22 EESIO(TU) I/O Serial data signal input/output for EEPROM communication.
23 EECKO(TU) O Serial clock signal output for EEPROM communication.
24 FUNC_SEL O Not used. (Open)
25 ATT O Audio mute control signal output
26 NC O Not used. (Open)
27 I2C_CKO O I2C bus serial clock signal output
28 I2C_SIO I/O I2C bus serial data signal input/output
29 TX O Flash writer transmitter signal output
30 RX I Flash writer receiver signal input
31, 32 NC O Not used. (Open)
33 CD_TX O CD mechanism deck transmitter signal output
34 CD_RX I CD mechanism deck receiver signal input
35 E-MUTE O Electronic volume IC mute detection signal output
36 E-DATA O Spectrum analyzer data signal output
37 E-CLK O Spectrum analyzer clock signal output
38 NC O Not used. (Open)
39 HOLD I External data bus (HOLD) signal input (Fixed at L)
40 AMP_DIAG I Amplifi er self diagnostic mode signal input
41 AMP_STB O Amplifi er standby signal output
42 LANG I
Foreign language font display mode with/without setting signal input (L: without foreign
language font display mode (CDX-GT828U/GT870US), H: with foreign language font display
mode (CDX-GT878US))
43 NC O Not used. (Open)
44 WRI/WR I External data bus (WRI/WR) signal input (Fixed at H)
45 WAKE_UP_OUT O Wake-up signal output (L: sleep mode, H: wake-up mode)
46 OPEN_REQ I Front panel open request signal input
47 EJECT_OK O CD eject OK signal output
48 NC O Not used. (Open)
49 CD_ON I CD mechanism servo power control request signal input
50 Z_DET I CD zero cross mute detection signal input
51 ILL-IN I Illumination detection signal input
52 ACC_IN I Accessory power supply detection signal input