AS4C64M8D1-5BIN datasheet(8/65 Pages) ALSC

Part #	AS4C64M8D1-5BIN

Description	Individual byte write mask control

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Manufacturer	ALSC [Alliance Semiconductor Corporation]

Direct Link	https://www.alliancememory.com

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Operation Mode

Fully synchronous operations are performed to latch the commands at the positive edges of CK. Table 3

shows the truth table for the operation commands.

Table 3. Truth Table (Note (1), (2))

Command

State

CKEn-1 CKEn

DM BA0,1 A10 A0-9, 11-12

CS

RAS CAS WE

BankActivate

Idle(3)

H

X

V

Row address

L

H

BankPrecharge

Any

H

X

V

L

X

L

H

L

PrechargeAll

Any

H

X

H

X

L

H

L

Write

Active(3)

H

X

V

L

Column

address

(A0 ~ A9)

L

H

L

Write and AutoPrecharge

Active(3)

H

X

V

H

L

H

L

Read

Active(3)

H

X

V

L

Column

address

(A0 ~ A9)

L

H

L

H

Read and Autoprecharge

Active(3)

H

X

V

H

L

H

L

H

Mode Register Set

Idle

H

X

OP code

L

Extended MRS

Idle

H

X

OP code

L

No-Operation

Any

H

X

L

H

Burst Stop

Active(4)

H

X

L

H

L

Device Deselect

Any

H

X

H

X

AutoRefresh

Idle

H

X

L

H

SelfRefresh Entry

Idle

H

L

X

L

H

SelfRefresh Exit

Idle

L

H

X

H

X

(SelfRefresh)

L

H

Precharge Power Down Mode

Entry

Idle

H

L

X

H

X

L

H

Precharge Power Down Mode

Exit

Any

L

H

X

H

X

(PowerDown)

L

H

Active Power Down Mode Entry

Active

H

L

X

H

X

L

V

Active Power Down Mode Exit

Any

L

H

X

H

X

(PowerDown)

L

H

Data Input Mask Disable

Active

H

X

L

X

Data Input Mask Enable

Active

H

X

H

X

Note:

1. V=Valid data, X=Don't Care, L=Low level, H=High level

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

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

3. These are states of bank designated by BA signal.

4. Device state is 2, 4, and 8 burst operation.

512M DDR1-AS4C64M8D1

Confidential

-8-

Rev.1.0

May 2015

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