EDD2508AKTA-5 datasheet(18/48 Pages) ELPIDA

Part #	EDD2508AKTA-5

Description	256M bits DDR SDRAM (32M words x 8 bits, DDR400)

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Manufacturer	ELPIDA [Elpida Memory]

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EDD2508AKTA-5

Preliminary Data Sheet E0349E60 (Ver. 6.0)

18

Command Truth Table for CKE

Current State

CKE

n – 1 n

/CS

/RAS /CAS /WE Address

Operation

Notes

Self refresh

H

×

INVALID, CK (n-1) would exit self refresh

L

H

×

Self refresh recovery

L

H

L

H

×

Self refresh recovery

L

H

L

H

L

×

ILLEGAL

L

H

L

×

ILLEGAL

L

×

Maintain self refresh

Self refresh recovery

H

×

Idle after tRC

H

L

H

×

Idle after tRC

H

L

H

L

×

ILLEGAL

H

L

×

ILLEGAL

H

L

H

×

ILLEGAL

H

L

H

×

ILLEGAL

H

L

H

L

×

ILLEGAL

H

L

×

ILLEGAL

Power down

H

×

INVALID, CK (n – 1) would exit power down

L

H

×

EXIT power down

→ Idle

L

H

L

H

×

L

×

Maintain power down mode

All banks idle

H

×

Refer to operations in Function Truth Table

H

L

H

×

Refer to operations in Function Truth Table

H

L

H

×

Refer to operations in Function Truth Table

H

L

H

×

CBR (auto) refresh

H

L

OPCODE Refer to operations in Function Truth Table

H

L

H

×

Refer to operations in Function Truth Table

H

L

H

×

Refer to operations in Function Truth Table

H

L

H

×

Refer to operations in Function Truth Table

H

L

H

×

Self refresh

1

H

L

OPCODE Refer to operations in Function Truth Table

L

×

Power down

1

Row active

H

×

Refer to operations in Function Truth Table

L

×

Power down

1

Remark: H: VIH. L: VIL.

×: VIH or VIL

Note: Self refresh can be entered only from the all banks idle state. Power down can be entered only from all

banks idle or row active state.

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EDD2508AKTA-5 Datasheet(PDF) 18 Page - Elpida Memory

EDD2508AKTA-5 Datasheet(HTML) 18 Page - Elpida Memory

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