Service Manual

No.
1/0
Pin Name
Function
41
1/0
A9
Address bus
42
- YSS6
Power
supply (OV)
43
A10
44
All
45
I/0
A12
Address bus
46
A13
47
Al4
48
- YCC6
Power supply (5Y)
49
1/0
A15
Address bus
50
-
YSS7
Power
supply (OY)
51
Al6
52
I/0
Al7
Address bus
53 A18
54
-
VCC7
Power supply (5Y)
55
1/0
Al9
Address bus
56
- YSS8
Power
supply(OY)
57
A20
58
1/0
A21
Address bus
59
A22
60
-
VCC8
Power supply (5Y)
61
1!0
A23
Address bus
62
-
VSS9
Power
supply (OY)
63
A24
64
1/0
A25 Address bus
65
A26
66
0
DACKO DMACO acknowledge
67
-
YCC9
Power supply (5Y)
68
0 DACK1
DMACl acknowledge
69
-
VSSIO
Power
supply (OY)
70
I
DREQO
DMACO
request
71
I DREQ1 DMAClrequest
72
0
cso
I Chip select 0
73
0
CS1
Chip select I
74
0
CS2
Chip select 2
75
0
CS3
Chip select 3
76
I/0
BS
Bus cycle start
77
1/0
RD/WR
Read/write
78
-
YSSll
Power supply (OY)
79
0
RAS,
CE
RAS for DRAM/SDRAM, CE for PSRAM
80
0
CAS,OE
CAS for SDRAM/OE for PSRAM
81
0
CASHH, DQMUU,
WE3
Each memory most significant byte select signal
82
0
CASHL,
DQMUL, WE2
Each memory 2nd significant byte select signal
83
0
CASLH,
DWMLU, WEI
Each memory 3rd significant byte select signal
84
-
YCClO- Power supply (5Y)
85
0
CASLL,
DQMLL, WEO
Each memory least significant byte select signal
86
-
YSS12
Power
supply (OY)
87
0
RD
Read pulse
88
0 CKE
SDRAM clock enable control
89
I
WAIT
Hardware wait request
90
0
BEN
Reserve
91
-
YSS13
Power
supply (OY)
92
I
BACK, BRLS
Bus right permission in slave mode/Bus right acknowledge
in master mode.
93
0
BREQ,BGR
Bus right request in slave mode/Bus right acknowledge in master mode
94
0
WDTOYF
Watch dog timer output
95
0
FTOB
Free-running timer output B
96
-
VCC11
Power supply (SY)
97
0
FTOA
Free-running timer output A
98
-
VSS14
Power
supply (OY)
99
I
FTI
Free-running timer input
100
I
FTC!
Free-running timer clock input
101
I RXD
Serial data input
102
0
TXD
Serial data output
103
1!0
SCK
Serial clock input/output
-33-