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Pin
Pin Name
82
CPUCK
83
XHOLDAK
84
XWAIT/IP60
85
XHOLD/IP61
86
XHSTRD/IOP40
87
VSS
88
XINMDM
89
XOUTMDM
90
TEST1
91
TEST2
92
XTEST
93
TEST3
94
XOUT
95
XIN
96
VSS
97
3.3V
98
TEST4
99
XHSTWR/IOP41
100 XOPRBE/MUX/
OP53
101
XRAS/IOP42
102
XCAS1/IOP43
103
XCAS2/IOP44
104
DB3
105
DB2
106
DB4
107
DB1
108
DB5
109
DB0
110
DB6
111
DB7
112
XROMCS
113
XRD
114
3.3V
115
XWR
116
ADR0
117
ADR1
118
ADR2
119
VSS
120
ADR3
121
ADR4
122
ADR5
123
ADR6
Buffer Power
5V
supply
Tolerant
3.3V
3.3V
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
NO
3.3V
3.3V
NO
3.3V
NO
3.3V
3.3V
NO
3.3V
3.3V
NO
3.3V
NO
3.3V
YES
3.3V
3.3V
NO
3.3V
NO
3.3V
NO
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
Signal
I/O
Name
-
CPUCK
-
OPEN
HOOK
PULL
DOWN
H/S MUTE O Handset TX mute
DG
-
+3.3V
+3.3V
-
XTEST
+3.3V
-
XOUT
XIN
DG
+3.3V
+3.3V
RLY
O Tel line relay control
-
SP-MUTE
OPEN
O Not used
OPEN
O Not used
OPEN
O Not used
D3
2
4
1
5
0
6
D7
-
XROMCS
-
/RD
+3.3V
-
/WR
-
A0
-
1
-
2
DG
-
3
-
4
-
5
-
6
124
Description
CPU clock (6MHz) output
Not used
Hook detection
Not used
Ground
20.736MHz crystal oscillator buffer
20.736MHz crystal oscillator buffer
Test pin. fixed High
Test pin. fixed High
24MHz clock output
Test pin. fixed High
24MHz oscillator
24MHz oscillator
Ground
Power supply
Test pin. fixed High
Speaker mute control
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
ROM chip select
Read signal output
Power supply
Write signal output
Address bus
Address bus
Address bus
Ground
Address bus
Address bus
Address bus
Address bus
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