8

Integrated Silicon Solution, Inc. — 1-800-379-4774

Rev. 00D

02/15/06

IS43R32400A

DETAILED COMMAND TRUTH TABLE - LOW POWER MODES

Function (n)

Command (n)

Prior State (n - 1)

CKE (n - 1) CKE (n)

CS

CS

CS

CS

CS

RAS

RAS

RAS

RAS

RAS CAS

CAS

CAS

CAS

CAS WE

WE

WE

WE

WE

Maintain Power Down

don’t care

Power Down Mode

L

L

X

X

X

X

Maintain Self Refresh

don’t care

Self Refresh Mode

L

L

X

X

X

X

Exit Power Down

Deselect or NOP

Power Down

L

H

X

X

X

X

Exit Self Refresh Mode Deselect or NOP

Self Refresh Mode

L

H

X

X

X

X

Enter Pre-Charge

Deselect or NOP

All Banks Idle

H

L

X

X

X

X

Power Down Mode

Enter Active Power

Deselect or NOP

Bank(s) Active

H

L

X

X

X

X

Down Mode

Enter Self Refresh

Auto Refresh

All Banks Idle

H

L

L

L

L

H

Mode

Function (n)

Command (n)

Prior State (n - 1)

CKE (n - 1)

CKE (n)

CS

CS

CS

CS

CS RAS

RAS

RAS

RAS

RAS

CAS

CAS

CAS

CAS

CAS WE

WE

WE

WE

WE

Start Pre-charge

Pre-charge

Row in bank b active,

H

H

L

L

H

L

activating, or

pre-charging

Pre-charge

Read underway in

H

H

L

L

H

L

bank b (Auto Pre-

charge disabled)

Pre-charge

Write underway in

H

H

L

L

H

L

bank b (Auto Pre-

charge disabled)

Pre-charge

Read underway in

H

H

L

L

H

L

bank b (Auto Pre-

charge enabled)

Pre-charge

Write underway in

H

H

L

L

H

L

bank b (Auto Pre-

charge enabled)

Note:

1. A Write command may be terminated only at the completion of the Read burst. However, a Burst Terminate can be transmitted

to end the Read burst early so that a Write command can be asserted.