W9412G2IB4 datasheet(23/50 Pages) WINBOND

Part #	W9412G2IB4

Description	Double Data Rate architecture; two data transfers per clock cycle

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W9412G2IB

Publication Release Date: Aug. 30, 2010

- 23 -

Revision A06

8.5 Function Truth Table for CKE

CKE

CURRENT

STATE

n-1

n

CS RAS

CAS

WE

ADDRESS

ACTION

NOTES

H

X

INVALID

L

H

X

Exit Self Refresh->Idle after tXSNR

L

H

L

H

X

Exit Self Refresh->Idle after tXSNR

L

H

L

H

L

X

ILLEGAL

L

H

L

X

ILLEGAL

Self Refresh

L

X

Maintain Self Refresh

H

X

INVALID

L

H

X

Exit Power down->Idle after tIS

Power Down

L

X

Maintain power down mode

H

X

Refer to Function Truth Table

H

L

H

X

Enter Power down

2

H

L

H

X

Enter Power down

2

H

L

H

X

Self Refresh

1

H

L

H

L

X

ILLEGAL

H

L

X

ILLEGAL

All banks Idle

L

X

Power down

H

X

Refer to Function Truth Table

H

L

H

X

Enter Power down

3

H

L

H

X

Enter Power down

3

H

L

H

X

ILLEGAL

H

L

H

L

X

ILLEGAL

H

L

X

ILLEGAL

Row Active

L

X

Power down

Any State

Other Than

Listed Above

H

X

Refer to Function Truth Table

Notes

:

1. Self refresh can enter only from the all banks idle state.

2. Power Down occurs when all banks are idle; this mode is referred to as precharge power down.

3. Power Down occurs when there is a row active in any bank; this mode is referred to as active power down.

Remark: H = High level, L = Low level, X = High or Low level (Don’t Care), V = Valid data

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