SM55161A Austin Semiconductor, SM55161A Datasheet - Page 47

• Manufacturer Part Number: SM55161A
• Description: 262144 x 16 BIT VRAM MULTIPORT VIDEO RAM
• Manufacturer: Austin Semiconductor

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TABLE 13: BLOCK-WRITE-CYCLE STATE TABLE
Write-mask data 0: I/O write disable
Column-mask data DQi – DQi + 7 0: column-write disable
SMJ55161A
Rev. 1.6 03/05
COLUMN MASK DATA
Block-write operation (nonmasked)
Block-write operation with nonpersistent write-per-bit
Block-write operation with persistent write-per-bit
Lower Byte
Upper Byte
1: I/O write enable DQ
DQ0-15
DQ10
DQ11
DQ12
DQ13
DQ14
DQ15
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
DQ9
Austin Semiconductor, Inc.
(i = 0,8) 1: column-write enable
CYCLE
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)
COLUMN MASK DATA
47
H
1
L
L
High: No Mask
High: No Mask
Write Mask Valid Data
Low: Mask
Low: Mask
Don't Care
Don't Care
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
STATE
2
Valid Data
Valid Data
3
Production
SM55161A
VRAM