36
• MAIN BOARD IC600 MB90574BPMT-G-265-BND (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1NCO
Not used (open)
2 AMSIN I
Whether a music is present or not from CXA2510AQ (IC250) is detected at auto music sensor
“L”: music is present, “H”: music is not present
3 AMSON O
Tape auto music sensor control signal output to the CXA2510AQ (IC250)
“L” is output to lower the gain for audio level at FF/REW mode
4 SA LAT O
Serial data latch pulse output for spectrum analyzer section to the liquid crystal display drive
controller (IC800)
5 ATT
O Audio line muting on/off control signal output terminal “H”: muting on
6 SYSRST O
System reset signal output to the liquid crystal display drive controller (IC800) and SONY bus
interface (IC500) “L”: reset
7 F/R O
Forward/reverse direction control signal output to the CXA2510AQ (IC250)
“L”: reverse direction, “H”: forward direction
8VCC—
Power supply terminal (+5V)
9 TAPE ATT O
Tape muting on/off control signal output to the CXA2510AQ (IC250) “H”: muting on
Active at ATA, FF/REW mode
10 T. ROM-SDA I/O Two-way data bus for tuner EEPROM with the FM/AM tuner unit (TUX1)
11
T. ROM-SCL I/O
Two-way bus clock signal for tuner EEPROM with the FM/AM tuner unit (TUX1)
12 RX I
Input terminal at the flash memory data write mode
Front panel open/close detection signal input terminal
“L” is input when the front panel is closed
13 TX O
Output terminal at the flash memory data write mode
Display serial data output to the liquid crystal display driver (IC901)
14 BUS-ON
O
Bus on/off control signal output to the liquid crystal display drive controller (IC800) and SONY
bus interface (IC500) “L”: bus on
15
BEEP O Beep sound drive signal output terminal
16 NC O
Not used (open)
17 UNISI
I Serial data input from the SONY bus interface (IC500)
18 UNISO
O Serial data output to the SONY bus interface (IC500)
19 UNICKO
O
Serial clock signal output to the liquid crystal display drive controller (IC800) and SONY bus
interface (IC500)
20 IF-BW
I
Tuner wide/narrow select signal input terminal “L”: wide, “H”: narrow
Not used (fixed at “L”)
21 SW SHIFT
O Not used
22, 23 NC O
Not used (open)
24
SIRCS
I
Sircs remote control signal input from the remote control receiver (IC951)
25
DSPSI
I
Serial data input from the CXD2726Q (IC100)
26
DSPSO
O
Serial data output to the CXD2726Q (IC100)
27
DSPCKO
O
Serial data transfer clock signal output to the CXD2726Q (IC100) and liquid crystal display drive
controller (IC800)
28
DSPPLL
O
PLL clock control signal output terminal Not used (open)
29
DSPMST
O
Bit clock (BCK) and L/R sampling (LRCK) signal master/slave mode selection signal output
terminal “L”: master mode, “H”: slave mode Not used (open)
30 NC O
Not used (open)
31 VOLATT
O
Pre amplifier muting on/off control signal output to the electrical volume (IC10)
“L”: muting on
32 TUMUTE O
Muting on/off control signal output of the FM/AM tuner signal “L”: muting on
33
VSS
—
Ground terminal
34 C —
Connected to coupling capacitor for the power supply Not used (open)
