SMJ44C251B Datasheet, PDF (24/57 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

Austin Semiconductor, Inc.
VRAM
SMJ44C251B
MT42C4256
FIGURE 14: Early-Write-Cycle Timing
WRITE-CYCLE STATE TABLE
CYCLE
1
Write Operation
L
Write-mask load/use, Write DQs to I/Os
L
Use previous write mask, Write DQs to I/Os
H
Load write mask on later of W\ fall and CAS\ fall H
STATE
2
3
4
5
L
H
Don't Care Valid Data
L
L Write Mask Valid Data
L
L
Don't Care Valid Data
L
H
Don't Care Write Mask
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
24
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