Functional Block Diagram - Harman Kardon HK 990/230 Service Manual

FUNCTIONAL BLOCK DIAGRAM

1Mbit x 4banks x 16 I/O Synchronous DRAM
Self refresh
logic & timer
CLK
Row Active
CKE
CS
RAS Refresh
CAS
Column Active
WE
U/LDQM
Bank Select
A0
A1
A11
BA1
BA0
Rev. 1.5 / Feb. 2005
Synchronous DRAM Memory 64Mbit (4Mx16bit)
Internal Row
Counter
Row
Pre
Decoder
Column
Pre
Decoder
Column Add
Counter
Address
Register
CAS Latency
Mode Register
35
HY57V641620E(L/S)T(P)-xI Series
1Mx16 BANK 3
1Mx16 BANK 2
1Mx16 BANK 1
1Mx16 BANK 0
Memory
Cell
Array
Y-Decoder
Burst
Counter
Data Out Control
DQ0
DQ15
Pipe Line
Control
5