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6 - 1
MAIN BOARD
TABLE OF CONTENTS
Internal IC Diagram ........................................................................... 6-1
Circuit Diagram(part one) .................................................................. 6-2
Circuit Diagram(part two) ................................................................... 6-3
Circuit Diagram(part three) ................................................................ 6-4
PCB Layout Top View ....................................................................... 6-5
PCB Layout Bottom View .................................................................. 6-6
INTERNAL IC DIAGRAM - TAS5508B
INTERNAL IC DIAGRAM - HY57V641620F
Internal Row
Self refresh
Counter
logic & timer
CLK
Row
Row Active
Pre
CKE
Decoder
CS
RAS
Refresh
CAS
Column Active
Column
WE
Pre
Decoder
U/LDQM
Column Add
Bank Select
Counter
A0
Address
Register
A1
Burst
Counter
A11
CAS Latency
Mode Register
BA1
BA0
6 - 1
1Mx16 BANK 3
1Mx16 BANK 2
1Mx16 BANK 1
1Mx16 BANK 0
DQ0
Memory
Cell
Array
DQ15
Y-Decoder
Pipe Line
Control
Data Out Control
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