97SD3232 datasheet(8/39 Pages) MAXWELL

8 / 39 page

97SD3232

All data sheets are subject to change without notice

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

01.11.05 Rev 2

Command Operation

Command Truth Table

The SDRAM recognizes the following commands specified by the CS, RAS, CAS, WE and address pins:

Note: H: V

IH L: VIL x VIH or VIL V: Valid address input

Ignore command (DESL): When this command is set (CS = High), the SDRAM ignores command input at

the clock. However, the internal status is held.

No Operation (NOP): This command is not an execution command. However, the internal operations

continue.

Column address strobe and read command (READ): This command starts a read operation. In addition,

the start address of a burst read is determined by the column address (AY0 to AY9) and the bank select

address (BS). After the read operation, the output buffer becomes High-Z.

Read with auto-precharge (READ A): This command automatically performs a precharge operation after a

burst read with a burst length of 1, 2, 4, or 8.

COMMAND

SYMBOL

-1

RAS

CAS

BA0/

BA1

A10

A0 TO

A12

Ignore command

DESL

No Operation

NOP

Column Address and

Read command

READ

Read with auto-pre-

charge

READ A

Column Address and

write command

WRIT

Write with auto-pre-

charge

WRIT A

Row address strobe

and bank active

ACTV

Precharge select

bank

PRE

Precharge all banks

PALL

Refresh

REF/

SELF

LLLL

Mode register set

MRS

LLLL

97SD3232 Datasheet(PDF) 8 Page - Maxwell Technologies

97SD3232 Datasheet(HTML) 8 Page - Maxwell Technologies

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Datasheet Download

Link URL