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
