48SD6404RPFK datasheet(8/42 Pages) MAXWELL

Part #	48SD6404RPFK

Description	256 Mb SDRAM 16-Meg X 4-Bit X 4-Banks

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Manufacturer	MAXWELL [Maxwell Technologies]

Direct Link	http://www.maxwell.com

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48SD6404

8

All data sheets are subject to change without notice

256Mb (16-Meg X 4-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, A11) 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

N

-1

N

CS

RAS

CAS

WE

BA0/

BA1

A10

A0 TO

A12

Ignore command

DESL

H

x

H

x

No Operation

NOP

H

x

L

H

x

Column Address and

Read command

READ

H

x

LH

V

L

V

Read with auto-pre-

charge

READ A

H

x

L

H

L

H

V

H

V

Column Address and

write command

WRIT

H

x

L

H

L

V

L

V

Write with auto-pre-

charge

WRIT A

H

x

L

H

L

V

H

V

Row address strobe

and bank active

ACTV

H

x

L

H

V

Precharge select

bank

PRE

H

x

L

H

L

V

L

x

Precharge all banks

PALL

H

x

L

H

L

x

H

x

Refresh

REF/

SELF

H

LLLL

H

x

Mode register set

MRS

H

x

LLLL

V

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48SD6404RPFK Datasheet(PDF) 8 Page - Maxwell Technologies

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