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MB91401
10
(Continued)
Pin name Pin no.
Polarity
I/O
Circuit
Function/application
D31
D30
D29
D28
D27
D26
D25
D24
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
169
110
168
109
42
218
167
108
41
166
107
40
106
39
38
105
36
165
104
35
164
103
34
216
163
102
33
162
101
32
100
31
I/O B
Data input/output pins
32 bits data input/output signal pin.
CSX6
CSX1
CSX0
159
98
29
Nega-
tive
OUT B
Chip select output pins
3-bit chip select signal pin.
Output the “L” level when accessing to external memory.
RDX 27
Nega-
tive
OUT B
Read strobe output pin
Read strobing signal pin.
Output the “L” level when read accessing.
WRX3
WRX2
WRX1
WRX0
96
28
97
158
Nega-
tive
OUT B
Write strobing output pins
Write strobing signal pin.
Output the “L” level when write accessing.
MCLKO 25 OUT F
Memory clock output pin
Clock for peripheral resources pin.
RDY 157
Posi-
tive
IN D
External RDY input pin
When the external bus is not completed, the bus cycle can
be extended by inputting “0”.
Prelminary
2004.11.12