Akai ADP-841, Service Manual

Page: 23 / 39

MT1389 B/ C
PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MTK CONFIDENTIAL, NO DISCLOSURE
10
MTK Confidential A
FOR SZ_MTK USE ONLY
Pin Main Alt. Type Description
176 RD25
Inout
Non-pull
GPIO
174 RD26
Inout
Non-pull
GPIO
172 NC
171 NC
170 RD29
Inout
Non-pull
GPIO
169 RD30
Inout
Pull-Up
GPIO
168 RD31
Inout
Pull-Up
GPIO
166 RA4
Inout
DRAM address 4
165 RA5
Inout
DRAM address 5
164 RA6
Inout
DRAM address 6
162 RA7
Inout
DRAM address 7
160 RA8
Inout
DRAM address 8
159 RA9
Inout
DRAM address 9
158 RA11 GPIO
Inout
Pull-Down
3) DRAM address bit 11
4) While using DRAM size <=4MB:
I) GPIO
157 CKE output DRAM clock enable
156 RCLK Inout Dram clock
154 NC
153 NC
151 RA3
Inout
DRAM address 3
150 RA2
Inout
DRAM address 2
149 RA1
Inout
DRAM address 1
147 RA0
Inout
DRAM address 0
146 RA10
Inout
DRAM address 10
145 BA1
Inout
DRAM bank address 1
143 BA0
Inout
DRAM bank address 0
142 RCS#
output
DRAM chip select, active low
140 RAS#
output
DRAM row address strobe, active low
139 CAS#
output
DRAM column address strobe, active low
138 RWE#
output
DRAM Write enable, active low
137 DQM1
Inout
Data mask 1
136 DQS1
Inout
Non-pull
GPIO
135 RD8
Inout
DRAM data 8
133 RD9
Inout
DRAM data 9
132 RD10
Inout
DRAM data 10
131 RD11
Inout
DRAM data 11
130 RD12
Inout
DRAM data 12
129 RD13
Inout
DRAM data 13
128 RD14
Inout
DRAM data 14