EDS2508APSA-75 データシートの表示（PDF） - Elpida Memory, Inc

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EDS2508APSA-75

256M bits SDRAM

Elpida Memory, Inc 

EDS2508APSA, EDS2516APSA

DQM Truth Table

Commands

Write enable/output enable

Write inhibit/output disable

Upper byte write enable/output enable

Lower byte write enable/output enable

Upper byte write inhibit/output disable

Lower byte write inhibit/output disable

Remark: H: VIH. L: VIL. ×: VIH or VIL

Write: IDID is needed.

Read: IDOD is needed.

CKE Truth Table

Current state

Activating

Any

Clock suspend

Idle

Idle

Self refresh

Function

Clock suspend mode entry

Clock suspend mode

Clock suspend mode exit

CBR (auto) refresh command

Self refresh entry

Self refresh exit

Idle

Power down entry

Power down

Power down exit

Remark: H: VIH. L: VIL. ×: VIH or VIL

Symbol

ENB

MASK

ENBU

ENBL

MASKU

MASKL

Symbol

REF

SELF

CKE

n–1

H

L

L

H

H

L

L

H

H

L

L

CKE

n–1

n

H

×

H

×

H

×

H

×

H

×

H

×

DQM

UDQM

L

H

L

×

H

×

n

/CS

/RAS /CAS

L

×

×

×

L

×

×

×

H

×

×

×

H

L

L

L

L

L

L

L

H

L

H

H

H

H

×

×

L

L

H

H

L

H

×

×

H

H

×

×

H

L

H

H

LDQM

×

L

×

H

/WE Address

×

×

×

×

×

×

H

×

H

×

H

×

×

×

H

×

×

×

×

×

H

×

Data Sheet E0228E30 (Ver. 3.0)

17

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