Yamaha GX-900 Service Manual page 51

IC2 : M30622M8-xxxFP [P.C.B. MD]
Main System Microprocessor (MD CPU)
P0 /D 81
7 7
P0 /D 82
6 6
P0 /D 83
5 5
P0 /D 84
4 4
P0 /D 85
3 3
P0 /D 86
2 2
P0 /D 87
1 1
P0 /D 88
0 0
P10 /AN /K1 89
7 7 3
P10 /AN /K1 90
6 6 2
P10 /AN /K1 91
5 5 1
P10 /AN /K1 92
4 4 0
P10 /AN 93
3 3
P10 /AN 94
2 2
P10 /AN 95
1 1
AV 96
SS
P10 /AN 97
0 0
V 98
REF
AV 99
CC
P9 /AD 100
7 TRG
No. Port
1 P96/ANEX1
2 P95/ANEX0
3 P94/DA1
4 P93/DA0
5 P92/TB2in
6 P91/TB1in
7 P90/TB0in
8 BYTE
9 CNVss
10 P87/Xcin
11 P86/Xcout
12 /RESET
13 Xout
14 Vss
15 Xin
16 Vcc
17 P85//NMI
18 P84//INT2
19 P83//INT1
20 P82//INT0
21 P81/TA4in
22 P80/TA4out
23 P77/TA3in
24 P76/TA3out
25 P75/TA2in
26 P74/TA2out
27 P73/TA1in
28 P72/TA1out
29 P71/TA0in
30 P70/TA0out
31 P67/TxD1
32 P66/RxD1
33 P65/CLK1
34 P64//CTS
I/O Name
Unused (GND)
I/O
I/O Unused (GND)
Unused (GND)
I/O
Open
I/O
I/O Open
LINE MUTE
O /MUTE
I/O Open
I GND
I GND
Unused (GND)
I/O
Unused (GND)
I/O
I /RES Reset input
Ceramic lock 10MHz
O XOUT
GND level input
I GND
I XIN Ceramic lock 10MHz
Microprocessor power supply input
I VCC
I PU PU to Vcc
MD strobe input
I DSTB
Power failure detect (Power down)
I /PDN
I/O Unused (GND)
Unused (GND)
I/O
I/O Unused (GND)
Unused (GND)
I/O
I/O Unused (GND)
Unused (GND)
I/O
Unused (GND)
I/O
I/O Unused (GND)
MD unit power supply switching
O 6.5/5V
Unused (GND)
I/O
I/O Unused (GND)
Data to MAIN CPU
O SYSO
I SYSI Data from MAIN CPU
System command clock
I SYSCK
System command control
I SYSCTL
50 P4 /CS0
4
49 P4 /CS1
5
48 P4 /CS2
6
47 P4 /CS3
7
46 P5 /WRL/WR
0
45 P5 /WRH/BHE
1
44 P5 /RD
2
43 P5 /BCLK
3
42 P5 /HLDA
4
41 P5 /HOLD
5
40 P5 /ALE
6
39 P5 /RDY/CLK
7 OUT
38 P6 /CTS /RTS
0 0 0
37 P6 /CLK
1 0
36 P6 /RXD
2 0
35 P6 /TXD
3 0
34 P6 /CTS /RTS /CTS /CLKS
4 1 1 0 1
33 P6 /CLK
5 1
32 P6 /RXD
6 1
31 P6 /TXD
7 1
Function
GX-900
50