SM55161A Datasheet, PDF (49/64 Pages) Austin Semiconductor – 262144 x 16 BIT VRAM MULTIPORT VIDEO RAM

Austin Semiconductor, Inc.
VRAM
SM55161A
Production
TABLE 14: ENHANCED-PAGE-MODE BLOCK-WRITE-CYCLE STATE TABLE
STATE
CYCLE
1
2
3
Block-write operation (nonmasked)
H
Don't Care Valid Data
Block-write operation with nonpersistent write-per-bit
L
Write Mask Valid Data
Block-write operation with persistent write-per-bit
L
Don't Care Valid Data
Write-mask data 0: I/O write disable
1: I/O write enable DQ
Column-mask data DQi – DQi + 7 0: column-write disable
(i = 0,8) 1: column-write enable
COLUMN MASK DATA
Lower Byte
Upper Byte
DQ0-15
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
DQ9
DQ10
DQ11
DQ12
DQ13
DQ14
DQ15
COLUMN MASK DATA
Column 0 (A0 = 0, A1 = 0, A2 = 0)
Column 1 (A0 = 1, A1 = 0, A2 = 0)
Column 2 (A0 = 0, A1 = 1, A2 = 0)
Column 3 (A0 = 1, A1 = 1, A2 = 0)
Column 4 (A0 = 0, A1 = 0, A2 = 1)
Column 5 (A0 = 1, A1 = 0, A2 = 1)
Column 6 (A0 = 0, A1 = 1, A2 = 1)
Column 7 (A0 = 1, A1 = 1, A2 = 1)
Column 0 (A0 = 0, A1 = 0, A2 = 0)
Column 1 (A0 = 1, A1 = 0, A2 = 0)
Column 2 (A0 = 0, A1 = 1, A2 = 0)
Column 3 (A0 = 1, A1 = 1, A2 = 0)
Column 4 (A0 = 0, A1 = 0, A2 = 1)
Column 5 (A0 = 1, A1 = 0, A2 = 1)
Column 6 (A0 = 0, A1 = 1, A2 = 1)
Column 7 (A0 = 1, A1 = 1, A2 = 1)
Low: Mask
High: No Mask
Low: Mask
High: No Mask
SMJ55161A
Rev. 1.6 03/05
49
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