Pioneer DVL-909 Service Guide - Page 33

Srm2b256slmx70 Dvdm Assy : Ic502

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DV-505, DVL-909, DV-S9 SRM2B256SLMX70 (DVDM ASSY : IC502) • 256 K SRAM (For Mechanism Control IC) • Block Diagram A0 10 A1 9 A2 8 A3 7 A4 6 A5 5 A6 4 A7 3 A8 25 A9 24 A10 21 A11 23 A12 2 A13 26 A14 1 Address Buffer 9 Line 512 Decoder 6 Row 64 Decoder CS 20 CS Control Logic Memory-Cell Array 512×64×8 64×8 Row Gate 8 OE 22 WE 27 OE, WE Control Logic 14 18 I/O Buffer 11 12 13 15 16 17 18 19 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 I/O8 VDD Vss • Pin Function No. Pin Name 1 A14 2 A12 3 A7 4 A6 5 A5 6 A4 7 A3 8 A2 9 A1 10 A0 11 I/O1 12 I/O2 13 I/O3 14 VSS Function Address input Data input/output GND (0V) No. Pin Name 15 I/O4 16 I/O5 17 I/O6 18 I/O7 19 I/O8 20 CS 21 A10 22 OE 23 A11 24 A9 25 A8 26 A13 27 WE 28 VDD Function Data input/output Chip select Address input Output enable Address input Write enable Power supply (2.7 to 5.5V) 33

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33
DV-505, DVL-909, DV-S9
SRM2B256SLMX70 (DVDM ASSY : IC502)
• 256 K SRAM (For Mechanism Control IC)
•
Block Diagram
•
Pin Function
10
9
8
7
6
5
4
3
25
24
21
23
2
26
1
Address Buffer
A0
A1
A2
A3
A4
9
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
20
CS
512
64
×
8
Line
Decoder
Memory-Cell
Array
512
×
64
×
8
6
8
Row
Decoder
64
Row Gate
Control
Logic
Control
Logic
I/O Buffer
22
OE
27
11
WE
Vss
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
I/O8
V
DD
CS
OE,
WE
12
14
18
13
15
16
17
18
19
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