SM55161A datasheet(49/64 Pages) AUSTIN

Part #	SM55161A

Description	262144 x 16 BIT VRAM MULTIPORT VIDEO RAM

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Manufacturer	AUSTIN [Austin Semiconductor]

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VRAM

SM55161A

Production

Austin Semiconductor, Inc.

AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.

49

SMJ55161A

Rev. 1.6

03/05

COLUMN MASK DATA

TABLE 14: ENHANCED-PAGE-MODE BLOCK-WRITE-CYCLE STATE TABLE

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

12

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

CYCLE

STATE

DQ0-15

COLUMN MASK DATA

DQ0

Column 0 (A0 = 0, A1 = 0, A2 = 0)

DQ1

Column 1 (A0 = 1, A1 = 0, A2 = 0)

DQ2

Column 2 (A0 = 0, A1 = 1, A2 = 0)

DQ3

Column 3 (A0 = 1, A1 = 1, A2 = 0)

DQ4

Column 4 (A0 = 0, A1 = 0, A2 = 1)

DQ5

Column 5 (A0 = 1, A1 = 0, A2 = 1)

DQ6

Column 6 (A0 = 0, A1 = 1, A2 = 1)

DQ7

Column 7 (A0 = 1, A1 = 1, A2 = 1)

DQ8

Column 0 (A0 = 0, A1 = 0, A2 = 0)

DQ9

Column 1 (A0 = 1, A1 = 0, A2 = 0)

DQ10

Column 2 (A0 = 0, A1 = 1, A2 = 0)

DQ11

Column 3 (A0 = 1, A1 = 1, A2 = 0)

DQ12

Column 4 (A0 = 0, A1 = 0, A2 = 1)

DQ13

Column 5 (A0 = 1, A1 = 0, A2 = 1)

DQ14

Column 6 (A0 = 0, A1 = 1, A2 = 1)

DQ15

Column 7 (A0 = 1, A1 = 1, A2 = 1)

Lower Byte

Upper Byte

Low: Mask

High: No Mask

Low: Mask

High: No Mask

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