WED9LC6816V

September, 2003

Rev. 1

11

White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

White Electronic Designs

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

Contact factory for ordering information.

Current State

Command

Action

Notes

SDCE#

SDRAS #

SDCAS#

SDWE#

A12 & A13 (BA)

A11-A0

Description

Idle

L

L

L

L

OP Code

Mode Register Set

Set the Mode Register

1

L

L

L

H

X

X

Auto or Self Refresh

Start Auto

1

L

L

H

L

X

X

Precharge

No Operation

L

L

H

H

BA

Row Address

Bank Activate

Activate the specified bank and row

L

H

L

L

BA

Column

Write w/o Precharge

ILLEGAL

2

L

H

L

H

BA

Column

Read w/o Precharge

ILLEGAL

1

L

H

H

L

X

X

Burst Termination

No Operation

1

L

H

H

H

X

X

No Operation

No Operation

H

X

X

X

X

X

Device Deselect

No Operation

Row Active

L

L

L

L

OP Code

Mode Register Set

ILLEGAL

L

L

L

H

X

X

Auto or Self Refresh

ILLEGAL

L

L

H

L

X

X

Precharge

Precharge

3

L

L

H

H

BA

Row Address

Bank Activate

ILLEGA

1

L

H

L

L

BA

Column

Write

Start Write; Determine if Auto Precharge

4,5

L

H

L

H

BA

Column

Read

Start Read; Determine if Auto Precharge

4,5

L

H

H

L

X

X

Burst Termination

No Operation

L

H

H

H

X

X

No Operation

No Operation

H

X

X

X

X

X

Device Deselect

No Operation

Read

L

L

L

L

OP Code

Mode Register Set

ILLEGAL

L

L

L

H

X

X

Auto or Self Refresh

ILLEGAL

L

L

H

L

X

X

Precharge

Terminate Burst; Start the Precharge

L

L

H

H

BA

Row Address

Bank Activate

ILLEGAL

2

L

H

L

L

BA

Column

Write

Terminate Burst; Start the Write cycle

5,6

L

H

L

H

BA

Column

Read

Terminate Burst; Start a new Read cycle

5,6

L

H

H

L

X

X

Burst Termination

Terminate the Burst

L

H

H

H

X

X

No Operation

Continue the Burst

H

X

X

X

X

X

Device Deselect

Continue the Burst

Write

L

L

L

L

OP Code

Mode Register Set

ILLEGAL

L

L

L

H

X

X

Auto or Self Refresh

ILLEGAL

L

L

H

L

X

X

Precharge

Terminate Burst; Start the Precharge

L

L

H

H

BA

Row Address

Bank Activate

ILLEGAL

2

L

H

L

L

BA

Column

Write

Terminate Burst; Start a new Write cycle

5,6

L

H

L

H

BA

Column

Read

Terminate Burst; Start the Read cycle

5,6

L

H

H

L

X

X

Burst Termination

Terminate the Burst

L

H

H

H

X

X

No Operation

Continue the Burst

H

X

X

X

X

X

Device Deselect

Continue the Burst

Read with

Auto Precharge

L

L

L

L

OP Code

Mode Register Set

ILLEGAL

L

L

L

H

X

X

Auto or Self Refresh

ILLEGAL

L

L

H

L

X

X

Precharge

ILLEGAL

2

L

L

H

H

BA

Row Address

Bank Activate

ILLEGAL

2

L

H

L

L

BA

Column

Write

ILLEGAL

L

H

L

H

BA

Column

Read

ILLEGAL

L

H

H

L

X

X

Burst Termination

ILLEGAL

L

H

H

H

X

X

No Operation

Continue the Burst

H

X

X

X

X

X

Device Deselect

Continue the Burst