Sony SX-M700 Service Manual page 66

AT28C16-15SC(ATMEL)
EP330PC-15(ALTERA)
SX-M700
CXK58257AP-10L(SONY)
CXK58257BM-10LL(SONY)
**********
C-MOS 256K (32,768x8)-BIT STATIC RAM
–TOP VIEW–
V
DD
A14 1 28
IN
(+5V)
A12 WE
IN 2 27 IN
A7
IN 3 26 A13
IN
A6
IN 4 25 A8
IN
A5
IN 5 24 A9
IN
A4 6 23 A11
IN IN
A3 OE
IN 7 22 IN
A2
IN 8 21 A10
IN
A1
IN 9 20 CE
IN
A0
IN
10 19 I/O 8
I/O 1 11 18 I/O 7
I/O 6
I/O 2 12 17
I/O 3 I/O 5
13 16
14 GND 15 I/O 4
CE OE
1
0
0
0
1
A14
ROW
26
A13
DECODER
2
A12
23
A11
24
BUFFER
A9
25
A8
3
MEMORY
A7
4
A6 MATRIX
5
A5 512 x 512
21
A10
6
A4
I/O GATE
7
A3
BUFFER COLUMN
8
A2
DECODER
9
A1
10
A0
22
OE
BUFFER
27
WE
20
CE
CXK58257SP-10L (1/2)
IL08
10
A0
9
A1
8
A2
7
11
A3
I/O 1
6
12
A4
I/O 2
5
13
A5
I/O 3
4
15
A6
I/O 4
3
16
A7
I/O 5
25
17
A8
I/O 6
24
18
A9
I/O 7
21
19
A10
I/O 8
23
A11
2
A12
26
A13
1
A14
OE WE CE
27
22 20
A0-A14 ; ADDRESS INPUTS
CE ; CHIP ENABLE INPUT
I/O1-I/O8 ; DATA INPUTS/OUTPUTS
OE ; OUTPUT ENABLE INPUT
WE ; WRITE ENABLE INPUT
WE MODE I/O TERMINAL
X X NOT SELECT HIGH IMPEDANCE
1 1 OUTPUT DISABLE HIGH IMPEDANCE
0 1 READ OUTPUT DATA
X 0 WRITE INPUT DATA
0 ; LOW LEVEL
1 ; HIGH LEVEL
X ; DON'T CARE
CXK58257SP-10L (2/2)
19
I/O 8
18
I/O 7
17
I/O 6
16
I/O I/O 5
15
BUFFER I/O 4
13
I/O 3
12
I/O 2
11
I/O 1
6-3