74
Pin No.
Pin Name
I/O
Description
1
CD DATA
O
Serial data output to the CD block
2
CD CLK
O
Serial data transfer clock signal output to the CD block
3
XLT
O
Serial data latch pulse signal output to the CD block
4
SIRCS
I
Remote control signal input from the remote control receiver (IC781)
5
NC
O
Not used (open)
6
SQ DATA
I
Subcode Q data input from the CD block
7
SQCLK
O
Subcode Q data reading clock signal output to the CD block “L”: active
8
BYTE
I
External data bus line byte selection signal input “L”: 16 bit, “H”: 8 bit (fixed at “L”)
9
CNVSS
—
Ground terminal
10
HOLD
O
Laser power control signal output terminal Not used (open)
11
SENS
I
Internal status (SENSE) input from the CD block
12
RESET
I
System reset signal input from the reset signal generator (IC505) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
13
XOUT
O
Main system clock output terminal (10 MHz)
14
VSS
—
Ground terminal
15
XIN
I
Main system clock input terminal (10 MHz)
16
VCC
—
Power supply terminal (+5V)
17
NMI
I
Non-maskable interrupt input terminal “L” active (fixed at “H” in this set)
18
PDOWN
I
Power down detection signal input terminal “L”: power down, normally: “H”
19
SCOR
I
Subcode sync (S0+S1) detection signal input from the CD block “H”: active
20
KEY CLK
I
Serial clock signal input terminal Not used (open)
21
KEY DATA
I
Serial data input terminal Not used (open)
22
KEY MUTE
O
Serial clock control signal output terminal Not used (open)
23
NC
O
Not used (open)
24
LINE MUTE
O
Audio line muting on/off control signal output “L”: line muting on
25
LDON
O
Laser diode on/off control signal output to the automatic power control circuit “H”: laser on
26
MD RST
O
Reset signal output to the system controller (IC801)
27
DAC MUTE
O
Muting control signal output to the D/A converter (IC300)
28
EXT ON
O
Not used (open)
29
IICCLK
I/O
Communication data reading clock signal output or transfer clock signal input with the system
controller (IC801)
30
IICDATA
I/O
Communication data bus with the system controller (IC801)
31
TXD1
O
Not used (open)
32
RXD1
O
Not used (open)
33
CLK1
O
Not used (open)
34
RTS1
O
Not used (open)
35
FLWITE
O
Serial data output to the display controller (IC751)
36
FLREAD
I
Serial data input from the display controller (IC751)
37
FLCLK
O
Serial data transfer clock signal output to the display controller (IC751)
38
FLCS
O
Serial data transfer request signal output to the display controller (IC751)
39
FLREQ
I
Serial data transfer request signal input terminal Not used (open)
40
FLBUSY
I
Serial data transfer permission signal input terminal Not used (open)
41
NC
O
Not used (fixed at “L”)
42
1-4
O
Disc speed selection (normal/4 speed) signal output to the CD block
43
1-2
O
Disc speed selection (normal/2 speed) signal output to the CD block
44
8-12
O
Disc size selection signal output to the CD block
• MAIN BOARD IC800 M30624MGA-322FP (CD MECHANISM CONTROLLER)
