CD-XP700H (serv.man15). Function table of IC - Sharp Audio Service Manual (repair manual). Page 7

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CD-XP700H
– 48 –
IC4 VHiLC32V4265B1: 4M (262144 words x 16 bits) DRAM (LC32V4265B)
1
VCC
Power supply.
2-5
I/O1-I/O4
Data I/O.
6
VCC
Power supply.
7-10
I/O5-I/O10
Data I/O.
11*-14*
N.C.
Not used.
15
WE
Write enable.
16
RAS
Low address strobe.
17*
N.C.
Not used.
18-21
A1-A3
Address input.
22
VCC
Power supply.
23
VSS
Ground
24-28
A4-A8
Address input.
29
OE
Output enable.
30
UCAS
Column address strobe. (Lower byte control)
31
LCAS
Column address strobe. (Upper byte control)
32*-34*
N.C.
Not used.
35-38
I/O9-I/O12
Data I/O.
39
VSS
Ground
40-43
I/O13-I/O16
Data I/O.
44
VSS
Ground
Terminal Name
Pin No.
Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
RAS
UCAS
Clock generator No. 1
Clock generator No. 2
LCAS
A0
A8
Mode control
Refresh counter
Low address
buffer
Column
address buffer
Row decoder
262144 memory cells
x 16 bits
512
512x16
512
Sense ampllfler I/O gate
Column decoder
Pre-decoder
Substrate bias generator
Clock generator No. 3
Lower byte
Upper byte
Data input buffer
I/O1 to I/O8
I/O9 to I/O16
Data output buffer
I/O1 to I/O8
I/O9 to I/O16
OE
I/O16
I/O1
WE
VSS
VCC
1
2
3
4
5 6 7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
VCC
I/O1
I/O2
I/O3
I/O4
VCC
I/O5
I/O6
I/O7
I/O8
N.C.
N.C.
N.C.
N.C.
WE
RAS
N.C.
A0
A1
A2
A3
VCC
VSS
I/O16
I/O15
I/O14
I/O13
VSS
I/O12
I/O11
I/O10
I/O9
N.C.
N.C.
N.C.
LCAS
UCAS
OE
A8
A7
A6
A5
A4
VSS
Figure 48 BLOCK DIAGRAM OF IC
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