MDX-C8970R - Sony Car Audio Service Manual (repair manual). Page 58

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Pin No.

Pin Name

I/O

Description

1

RE-IN0

I

2

RE-IN1

I

3

TIR-BUSY

I

Busy detection signal input from the MSM6688GS-2K (IC951)
“H” is output while MSM6688GS-2K (IC951) is executing a command

4

TIR-PDOWN

O

Power down control signal output to the MSM6688GS-2K (IC951)    “L”: power down

5

TIR-RST

O

Reset signal output to the MSM6688GS-2K (IC951)    “H”: reset

6

SYSRST

O

System reset signal output to the MD mechanism controller (IC501),  SONY bus interface 
(IC271) and liquid crystal display drive controller (IC701)    “L”: reset

7

BUS- ON

O

Bus on/off control signal output to the MD mechanism controller (IC501),  SONY bus interface 
(IC271) and liquid crystal display drive controller (IC701)    “L”: bus on

8

VCC

—

Power supply terminal (+5V)

9

DSP STP

O

PLL clock output control signal to the CXD2727Q (IC300)
At “L” is output: fixed at “L” is PLCLK (pin *¡ of IC300 CXD2727Q) 
At “H” is output: PLL clock signal output from the PLCLK (pin *¡ of IC300 CXD2727Q)

10

NCO

O

Not used (open)

11

CSV PLAY

O

Voice guide and DSP sound selection to the CSV mix switch (IC691)    “L”: voice guide mode

12

FLS SI

I

Input terminal at the flash memory data write mode

13

FLS SO

O

Output terminal at the flash memory data write mode

14

FLASH-W

I

Internal flash memory data write mode detection signal input terminal    “L”: data write mode
Not used (fixed at “H” in this set)

15

BEEP

O

Beep sound drive signal output terminal

16

CSV ON

O

CSV (IC801) power supply control output terminal    “H”: CSV power on

17

DSP SI

I

Serial data input from the CXD2727Q (IC300)

18

DSP SO

O

Serial data output to the CXD2727Q (IC300)

19

DSP CLK

O

Serial data transfer clock signal output to the CXD2727Q (IC300) and liquid crystal display drive 
controller (IC701)

20

UNI SI

I

Serial data input from the SONY bus interface (IC271)

21

UNI SO

O

Serial data output to the SONY bus interface (IC271)

22

UNI CKIO

I/O

Serial clock signal output to the MD mechanism controller (IC501), SONY bus interface (IC271) 
and liquid crystal display drive controller (IC701) or serial clock signal input from the MD 
mechanism controller (IC501) (for SONY bus)

23

SD-IN

I

Station detector detect input from the FM/AM tuner unit (TU101)
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

24

SIRCS

I

Sircs remote control signal input from the remote control receiver (IC910)

25

CSV-SI

I

Serial data input from the CSV (IC801)

26

CSV-SO

O

Serial data output to the CSV (IC801)

27

CSV-CKO

O

Serial data transfer clock signal output to the CSV (IC801)

28

DSP RST

O

Reset signal output to the CXD2727Q (IC300)    “L”: reset

29

ST-MONO

I/O

FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU101), or forced 
monaural control signal output to the FM/AM tuner unit (TU101)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode

30

DSP XMST

O

Bit clock (BCK) and L/R sampling clock (LRCK) signal master/slave mode selection signal 
output to the CXD2727Q (IC300)
“L”: master mode, “H”: slave mode

31

WIDE

O

Jog dial pulse input of the rotary encoder (EN900)
 (for VOLUME/BASS/TREBLE/BALANCE/FADER control)

IF band select signal output terminal    “H”: wide mode
In receiving FM signals, interference noise from adjacent stations is removed by narrowing the 
IF band automatically in the tuner unit so as to raise the selectivity, but in this case, the distortion 
may increase and accordingly, the IF band is widened forcibly