MT42C4256C-10/883C AUSTIN [Austin Semiconductor], MT42C4256C-10/883C Datasheet - Page 33

• Manufacturer Part Number: MT42C4256C-10/883C
• Description: 256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM
• Manufacturer: AUSTIN [Austin Semiconductor]

BLOCK-WRITE-CYCLE STATE TABLE
Write mask data 0: I/O write disable
Column mask data DQn =
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
Write-mask load/use, Block write
Use previous write mask, Block write
Write mask disable, Block write to all I/Os
FIGURE 23: Block-Write-Cycle Timing (Delayed-Write)
1: I/O write enable
(n = 0, 1, 2, 3)
Austin Semiconductor, Inc.
CYCLE
0 column write disable
1 column write enable
H
1
L
L
33
DQ0 — column 0 (address A1 = 0, A0 = 0)
DQ1 — column 1 (address A1 = 0, A0 = 1)
DQ2 — column 2 (address A1 = 1, A0 = 0)
DQ3 — column 3 (address A1 = 1, A0 = 1)
H
2
L
L
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
STATE
Write Mask Column Mask
Don't Care Column Mask
Don't Care Column Mask
3
SMJ44C251B
4
MT42C4256
VRAM
VRAM
VRAM
VRAM
VRAM