GS816272C

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.

Rev: 2.18 11/2005

5/31

© 1999, GSI Technology

Byte Write Truth Table

Function

GW

BW

BA

BB

BC

BD

BE

BF

BG

BH

Notes

Read

H

H

X

X

X

X

X

X

X

X

1

Read

H

L

H

H

H

H

H

H

H

H

1

Write byte A

H

L

L

H

H

H

L

H

H

H

2, 3

Write byte B

H

L

H

L

H

H

H

L

H

H

2, 3

Write byte C

H

L

H

H

L

H

H

H

L

H

2, 3, 4

Write byte D

H

L

H

H

H

L

H

H

H

L

2, 3, 4

Write byte E

H

L

H

H

H

H

L

H

H

H

2, 3, 4

Write byte F

H

L

H

H

H

H

H

L

H

H

2, 3, 4

Write byte G

H

L

H

H

H

H

H

H

L

H

2, 3, 4

Write byte H

H

L

H

H

H

H

H

H

H

L

2, 3, 4

Write all bytes

H

L

L

L

L

L

L

L

L

L

2, 3, 4

Write all bytes

L

X

X

X

X

X

X

X

X

X

Notes:

1. All byte outputs are active in read cycles regardless of the state of Byte Write Enable inputs.

3. All byte I/Os remain High-Z during all write operations regardless of the state of Byte Write Enable inputs.

4. Bytes “E”, “F”, “G” and “H” are only available on the x72 version.