AS4C64M8D2 datasheet(4/59 Pages) ALSC

4 / 59 page

AS4C64M8D2

Confidential

Rev. 1.0

Feb. /2014

Figure 3. State Diagram

(E)MRS

Setting

MR,

EMR(1)

EMR(2)

EMR(3)

OCD

calibration

Initialization

Sequence

Idle

All banks

precharged

Self

Refreshing

Precharge

Power

Down

Activating

Active

Power

Down

Bank

Active

Writing

With

Autoprecharge

Precharging

Reading

With

Autoprecharge

Reading

ACT

CKE

CKEH

CKEL

RDA

PR, PRA

RDA

WRA

CKE

SRF

CKE

REF

CKEL

Automatic Sequence

Cammand Sequence

CKEL = CKE LOW, enter Power Down

CKEH = CKE HIGH, exit Power Down,exit Self Refresh

ACT = Activate

WR(A) = Write (with Autoprecharge)

RD(A) = Read (with Autoprecharge)

PR(A) = Precharge (All)

(E)MRS = (Extended) Mode Register Set

SRF = Enter Self Refresh

REF = Refresh

Note: Use caution with this diagram. It is indented to provide a floorplan of the possible state transitions and the

commands to control them, not all details. In particular situations involving more than one bank,

enabling/disabling on-die termination, Power Down entry/exit, timing restrictions during state transitions, among

other things, are not captured in full detail.

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