VRAM
SMJ44C251B
MT42C4256
Austin Semiconductor, Inc.
FIGURE 14: Early-Write-Cycle Timing
WRITE-CYCLE STATE TABLE
STATE
CYCLE
1
L
L
H
H
2
L
L
L
L
3
H
L
L
H
4
5
Write Operation
Don't Care Valid Data
Write Mask Valid Data
Don't Care Valid Data
Don't Care Write Mask
Write-mask load/use, Write DQs to I/Os
Use previous write mask, Write DQs to I/Os
Load write mask on later of W\ fall and CAS\ fall
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
24