Sharp CD-BK2100V Service Manual page 58

CD-BK2100V
ICV3 VHiSDM4260C-1: DRAM (SDM4260C)
Port Name
Pin No.
1 VCC
2-10 I/O0-I/O7
11*,12* NC
13 WE
14 RAS
15* NC
16-19 A0-A3
20 VCC
21 VSS
22-26 A4-A8
27 OE
28,29 UCAS, LCAS
30* NC
31-34 I/O8-I/O11
35 VSS
36-39 I/O12-I/O15
40 VSS
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
RAS
14
29
LCAS
28
UCAS
13
WE
A0 16
17
A1
A2
18
19
A3
A4
22
A5 23
A6 24
A7
25
A8
26
Power supply
Data input/output
Not used
Read/write enable
Row address strobe
Not used
Address input (row/refresh: A0 to A3) (Column: A0 to A3)
Power supply
Ground
Address input (row/refresh: A4 to A8) (Column: A4 to A8)
Output enable
Column address strobe
Not used
Data input/output
Ground
Data input/output
Ground
Clock generating
circuit
Coidmn decoder
A0-A8
I/O control circuit
Memory cell array
A0-A8
Figure 58 BLOCK DIAGRAM OF IC
Function
Lower data
Lowar
Input buffer
Upper
Lower data
Output buffer
Upper data
Input buffer
Upper data
Output buffer
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1
VCC
20
40
35
VSS
21
2
I/O0
3
I/O1
10
I/O7
31
I/O8
32
I/O9
39
I/O15
27
OE