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7-12. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC201 CXP740056-005R (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1 ESPSEL I ESP on/off setting terminal “L”: ESP on Not used (open)
2MLO
Normal/high speed playback control signal output terminal “L”: high speed playback
Not used (open)
3 EMPHO O Emphasis signal output terminal Not used (open)
4 AMUTE O Audio line muting on/off control signal output terminal “H”: muting on
5 CDXLT O Serial data latch pulse signal output to the CXD2598Q (IC101)
6 CDDATA O Serial data output to the CXD2598Q (IC101)
7 CDCLK O Serial data transfer clock signal output to the CXD2598Q (IC101)
8 CDON O D/A converter and servo section power supply on/off control signal output “H”: power on
9 ELVON O Mechanism deck section power supply on/off control signal output “H”: power on
10 DOUTSEL I Digital output on/off control signal input terminal “L”: digital output on Not used (open)
11 NC — Not used (open)
12 RAMWE O
Data write enable signal output to the S-RAM (IC202) (CDX-636 only) “L”: active
CDX-601: Not used (open)
13 to 20
RAMIO8 to RAMIO1
I/O Two-way data bus with the S-RAM (IC202) (CDX-636 only) CDX-601: Not used (open)
21 to 28 RAM7 to RAM0 O Address signal output to the S-RAM (IC202) (CDX-636 only) CDX-601: Not used (open)
29 NC — Not used (open)
30 to 36
RAM14 to RAM8
O Address signal output to the S-RAM (IC202) (CDX-636 only) CDX-601: Not used (open)
37 RAMCE O
Chip enable signal output to the S-RAM (IC202) (CDX-636 only) “L”: active
CDX-601: Not used (open)
38 RESET I
System reset signal input from the SONY bus interface (IC302) and reset signal generator (IC303)
“L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
39 GND — Ground terminal
40 XTAL O Main system clock output terminal (12 MHz)
41 EXTAL I Main system clock input terminal (12 MHz)
42 TEXTSEL I
CD text mode setting terminal “L”: CD text on, “H”: does not display track name
CDX-601: fixed at “H” (open) CDX-636: fixed at “L”
43 SI I Serial data input from the SONY bus interface (IC302)
44 SO O Serial data output to the SONY bus interface (IC302)
45 SCLK I Serial data transfer clock signal input from the SONY bus interface (IC302)
46 CFSEL I
Custom file on/off setting terminal “L” custom file on
CDX-601: fixed at “H” (open) CDX-636: fixed at “L”
47 EEINIT I
Initialize signal input for the EEPROM (IC203) “H”: format
CDX-601: not used (open) CDX-636: fixed at “L”
48 EEDATA I/O Two-way data bus with the EEPROM (IC203) (CDX-636 only) CDX-601: not used (open)
49 EECLK O
Serial data transfer clock signal output to the EEPROM (IC203) (CDX-636 only)
CDX-601: not used (open)
50 VSS — Ground terminal (for A/D converter)
51 AVREF I Reference voltage (+5V) input terminal (for A/D converter)
52 VDD — Power supply terminal (+5V) (for A/D converter)
53 SINGLE I
Setting terminal for the single disc/multiple discs mode
“L”: single mode, “H”: multiple discs mode Fixed at “H” in this set (open)
54 LDON O The laser automatic power control on/off signal output “H”: automatic power control on
55 AGCHOLD O RF AGC hold on/off signal output “H”: hold
56 RFAGC I/O RF AGC level control signal output “L”: off, center voltage: 40%, “H”: 60%
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