MB81P643287-50 datasheet(7/65 Pages) FUJITSU

Part #	MB81P643287-50

Description	8 x 256K x 32 BIT, FCRAMTM CORE BASED DOUBLE DATA RATE SDRAM

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Manufacturer	FUJITSU [Fujitsu Component Limited.]

Direct Link	http://edevice.fujitsu.com/fmd/en/index.html

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MB81P643287-50/-60

7

DM TRUTH TABLE (Effective during Write mode)

CKE TRUTH TABLE

*11: The REF and SELF commands should only be issued after all banks have been precharged (PRE or PALL

command). In case of SELF command, it should also be issued after the last read data have been appeared

on DQ. Refer to “s STATE DIAGRAM”.

*12: CKE must bring to Low level together with REF command.

*13: The PDEN command should only be issued after the last read data have been appeared on DQ and after the

lDPL is satisfied from last write data input.

Function

Command

CKE

DM0

DM1

DM2

DM3

(n - 1)

(n)

Data Mask for DQ0 to DQ7

MASK0

HXHX

X

Data Mask for DQ8 to DQ15

MASK1

H

X

H

X

Data Mask for DQ16 to DQ23

MASK2

HX

X

HX

Data Mask for DQ24 to DQ31

MASK3

H

X

H

Current

State

Function

Notes

Command

CKE

CS

RAS CAS

WE

AP

BA0

to

BA2

A0

to

A10

DQ0

to

DQ31

(n-1)

(n)

Idle

Auto-refresh

*11

REF

H

L

H

X

—

Idle

Self-refresh Entry

*11

*12

SELF

H

L

H

X

Hi-Z

Self-

refresh

Self-refresh Continue

—

L

X

Hi-Z

Self-

refresh

Self-refresh Exit

SELFX

LH

L

H

X

Hi-Z

LH

H

X

Hi-Z

Idle

Power Down Entry

*13

PDEN

HL

L

H

X

XHi-Z

HL

H

X

XHi-Z

Power

Down

Power Down Continue

—

L

X

Hi-Z

Power

Down

Power Down Exit

PDEX

LH

L

H

X

Hi-Z

LH

H

X

Hi-Z

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MB81P643287-50 Datasheet(PDF) 7 Page - Fujitsu Component Limited.

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