97SD3232RPME Datasheet

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1 Gb (8-Meg X 32-Bit X 4-Banks) SDRAM

Function Truth Table

97SD3232

The following function table shows the operations that are performed when each command is issued in each

mode of the SDRAM.

The following table assumes that CKE is High.

C

URRENT

S

TATE

Precharge

CS

H

L

L

L

L

L

L

L

Idle

H

L

L

L

L

L

L

L

Row active

H

L

L

L

L

L

L

L

RAS

x

H

H

H

L

L

L

L

x

H

H

H

L

L

L

L

x

H

H

H

L

L

L

L

CAS

x

H

L

L

H

H

L

L

x

H

L

L

H

H

L

L

x

H

L

L

H

H

L

L

WE

x

H

H

L

H

L

H

L

x

H

H

L

H

L

H

L

x

H

H

L

H

L

H

L

A

DDRESS

x

x

BA, CA, A10

BA, CA, A10

BA, RA

BA, A10

x

MODE

x

x

BA, CA, A10

BA, CA, A10

BA, RA

BA, A10

x

MODE

x

x

BA, CA, A10

BA, CA, A10

BA, RA

BA, A10

x

MODE

C

OMMAND

DESL

NOP

READ/READ A

WRIT/WRIT A

ACTV

PRE, PALL

REF, SELF

MRS

DESL

NOP

READ/READ A

WRIT/WRIT A

ACTV

PRE, PALL

REF, SELF

MRS

DESL

NOP

READ/READ A

WRIT/WRIT A

ACTV

PRE, PALL

REF, SELF

MRS

O

PERATION

Enter IDLE after t

RP

Enter IDLE after t

RP

ILLEGAL

1

ILLEGAL

1

ILLEGAL

1

NOP

2

ILLEGAL

ILLEGAL

Memory

NOP

NOP

ILLEGAL

3

ILLEGAL

3

Bank and row active

NOP

Refresh

Mode register set

NOP

NOP

Begin read

Begin write

Other bank active

ILLEGAL on same bank

4

Precharge

ILLEGAL

ILLEGAL

01.11.05 Rev 2

All data sheets are subject to change without notice

12

漏2005 Maxwell Technologies

All rights reserved.

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