W9412G2IB datasheet(19/50 Pages) WINBOND

Part #	W9412G2IB

Description	1M 횞 4 BANKS 횞 32 BITS GDDR SDRAM

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W9412G2IB

Publication Release Date: Aug. 30, 2010

- 19 -

Revision A06

8. OPERATION MODE

The following table shows the operation commands.

8.1 Simplified Truth Table

SYM.

COMMAND

DEVICE

STATE

CKEn-1

CKEn

DM

(4)

BA0,BA1

A8

A0-A7

A9-

A11

CS

RAS

CAS

WE

ACT

Bank Active

Idle

(3)

H

X

V

L

H

PRE

Bank Precharge

Any

(3)

H

X

V

L

X

L

H

L

PREA

Precharge All

Any

H

X

H

X

L

H

L

WRIT

Write

Active

(3)

H

X

V

L

V

L

H

L

WRITA

Write with Auto-

precharge

Active

(3)

H

X

V

H

V

L

H

L

READ

Read

Active

(3)

H

X

V

L

V

L

H

L

H

READA

Read with Auto-

precharge

Active

(3)

H

X

V

H

V

L

H

L

H

MRS

Mode Register Set

Idle

H

X

L, L

C

L

EMRS

Extended Mode

Register Set

Idle

H

X

H, L

V

L

NOP

No Operation

Any

H

X

L

H

BST

Burst Read Stop

Active

H

X

L

H

L

DSL

Device Deselect

Any

H

X

H

X

AREF

Auto Refresh

Idle

H

X

L

H

SELF

Self Refresh Entry

Idle

H

L

X

L

H

SELEX

H

X

Self Refresh Exit

Idle

(Self

Refresh)

L

H

X

L

H

X

PD

H

X

Power Down

Mode Entry

Idle/

Active

(5)

H

L

X

L

H

X

PDEX

H

X

Power Down

Mode Exit

Any

(Power

Down)

L

H

X

L

H

X

WDE

Data Write Enable

Active

H

X

L

X

WDD

Data Write Disable

Active

H

X

H

X

Notes

:

1. V = Valid X = Don’t Care L = Low level H = High level

2. CKEn signal is input level when commands are issued.

CKEn-1 signal is input level one clock cycle before the commands are issued.

3. These are state designated by the BA0, BA1 signals.

4. DM0

−DM3 (W9412G2IB).

5. Power Down Mode can not entry in the burst cycle.

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