AS7C331MFT18A-85BC datasheet(6/19 Pages) ALSC

6 / 19 page

AS7C331MFT18A

1/21/05, v 1.4

Alliance Semiconductor

6 of 19

Write enable truth table (per byte)

Key: X = don’t care; L = low; H = high; BWE, BWn = internal write signal

Asynchronous Truth Table

Notes:

1. X means “Don’t Care”

2. ZZ pin is pulled down internally

3. For write cycles that follows read cycles, the output buffers must be disabled with OE, otherwise data bus contention will occur.

4. Snooze mode means power down state of which stand-by current does not depend on cycle times

5. Deselected means power down state of which stand-by current depends on cycle times

Burst sequence table

Function

GWE

BWE

BWa

BWb

Write all bytes (a, b)

XXX

LLL

Write byte a

Write byte b

Read

HXX

HLH

Operation

I/O Status

Snooze mode

High-Z

Read

Dout

High-Z

Write

Din, High-Z

Deselected

High-Z

Interleaved burst address (LBO = 1)

Linear burst address (LBO = 0)

A1 A0

1st Address

0 00 11 01 1

1st Address

0 00 11 0

1 1

2nd Address

0 10 01 11 0

2nd Address

0 11 01 1

0 0

3rd Address

1 01 10 00 1

3rd Address

1 01 10 0

0 1

4th Address

1 11 00 10 0

4th Address

1 11 00 1

1 0

AS7C331MFT18A-85BC Fiches technique(PDF) 6 Page - Alliance Semiconductor Corporation

AS7C331MFT18A-85BC Fiches technique(HTML) 6 Page - Alliance Semiconductor Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Fiches technique Télécharger

Lien URL