MB81ES653225-12/-12L

7

2.

DQM TRUTH TABLE

*1 : i

= 0, 1, 2, 3

3.

*2 : The CSUS command requires that at least one bank is active. Refer to “■STATE DIAGRAM”.

*3 : REF, SELF, DP and DPD commands should only be issued after all banks have been precharged

(PRE or PALL command) . Refer to “■STATE DIAGRAM”.

*4 : SELF, PD and DPD commands should only be issued after the last read data have been appeared on DQ.

Function

Symbol

CKE

n-1

n

Data Write/Output Enable

HX

L

Data Mask/Output Disable

HX

H

Current State

Function

Command

CKE

CS

RAS CAS

WE

BA

(AP)

Address

(Except

n-1

n

Bank Active

Clock Suspend

CSUS

H

L

XXXXXX

X

Any

(Except Idle)

Clock Suspend

⎯

L

L

XXXXXX

X

Clock Suspend

Clock Suspend

Mode Exit

⎯

L

H

XXXXXX

X

Idle

Auto-refresh

REF

H

H

LLL

H

X

X

X

Idle

Self-refresh Entry

SELF

H

L

LLL

H

X

X

X

Self Refresh

SELFX

L

H

L

HHH

X

X

X

L

H

H

XXXXX

X

Idle

Power Down Entry

PD

H

L

L

HHH

X

X

X

H

L

H

XXXXX

X

Power Down

Power Down Exit

PDX

L

H

L

HHH

X

X

X

L

H

H

XXXXX

X

Idle

Deep Power Down

DPD

H

L

L

H

H

L

X

X

X

Deep Power

Down

Deep Power Down

Exit

DPDX

L

H

L

HHH

X

X

X

L

H

H

XXXXX

X