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GS8170LW72AGC-250 Datasheet(PDF) 6 Page - GSI Technology

Part # GS8170LW72AGC-250
Description  18Mb 誇1x1Lp CMOS I/O Late Write SigmaRAM
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Manufacturer  GSI [GSI Technology]
Direct Link  http://www.gsitechnology.com
Logo GSI - GSI Technology

GS8170LW72AGC-250 Datasheet(HTML) 6 Page - GSI Technology

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GS8170LW36/72AC-350/333/300/250
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.04 4/2005
6/32
© 2003, GSI Technology
Late Write
In Late Write mode the RAM requires Data In one rising clock edge later than the edge used to load Address and Control. Late
Write protocol has been employed on SRAMs designed for RISC processor L2 cache applications and in Flow Through mode NBT
SRAMs.
Byte Write Control
The Byte Write Enable inputs (Bx) determine which bytes will be written. Any combination of Byte Write Enable control pins,
including all or none, may be activated. A Write Cycle with no Byte Write inputs active is a write abort cycle.
Example of x36 Byte Write Truth Table
Function
W
Ba
Bb
Bc
Bd
Read
H
X
X
X
X
Write Byte A
L
L
H
H
H
Write Byte B
L
H
L
H
H
Write Byte C
L
H
H
L
H
Write Byte D
L
H
H
H
L
Write all Bytes
L
L
L
L
L
Write Abort
L
H
H
H
H
SigmaRAM Late Write with Pipelined Read
Key
QD
QA
DC
CQ
Read
Read
CDE
ADV
Read
Deselect
Write
Hi-Z
F
Access
CK
Address
A
XX
/E1
/W
DQ


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