AS4C64M16D2-25BIN datasheet(7/58 Pages) ALSC

Part #	AS4C64M16D2-25BIN

Description	1Gb (64M x 16 bit) DDRII Synchronous DRAM (SDRAM)

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Manufacturer	ALSC [Alliance Semiconductor Corporation]

Direct Link	https://www.alliancememory.com

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AS4C64M16D2

Alliance Memory Inc. reserves the right to change products or specification without notice.

7

Rev. 1.1

April. /2012

Operation Mode

Table 4 shows the truth table for the operation commands.

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

Command

State

CKEn-1

CKEn

DM

BA0-2 A10 A0-9, 11-12

CS#

RAS# CAS#

WE#

BankActivate

Idle(3)

H

X

V

Row address

L

H

Single Bank Precharge

Any

H

X

V

L

X

L

H

L

All Banks Precharge

Any

H

X

H

X

L

H

L

Write

Active(3)

H

X

V

L

Column

address

(A0 – A9)

L

H

L

Write with 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

(Extended) Mode Register Set

Idle

H

X

V

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

Refresh

Idle

H

X

L

H

SelfRefresh Entry

Idle

H

L

X

L

H

SelfRefresh Exit

Idle

L

H

X

H

X

L

H

Power Down Mode Entry

Idle

H

L

X

H

X

L

H

Power Down Mode Exit

Any

L

H

X

H

X

L

H

Data Input Mask Disable

Active

H

X

L

X

Data Input Mask Enable(5)

Active

H

X

H

X

NOTE 1:

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

NOTE 2:

CKEn signal is input level when commands are provided.

NOTE 3: CKEn-1 signal is input level one clock cycle before the commands are provided.

NOTE 4:

These are states of bank designated by BA signal.

NOTE 5:

Device state is 4, and 8 burst operation.

NOTE 6:

LDM and UDM can be enabled respectively.

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