Datasheet

Figure 3. State Diagram
(E)MRS
Setting
MR,
EMR(1)
EMR(2)
EMR(3)
OCD
calibration
Initialization
Sequence
Idle
All banks
precharged
Self
Refreshing
Refreshing
Precharge
Power
Down
Activating
Active
Power
Down
Bank
Active
Writing
Writing
With
Autoprecharge
Precharging
Reading
With
Autoprecharge
Reading
ACT
C
K
E
L
C
K
E
H
CK
E
L
W
R
RD
A
R
D
A
W
RA
W
R
A
WR
RD
R
D
PR, PRA
PR, PRA
PR, PRA
RDA
WRA
C
K
E
L
C
K
E
H
C
K
E
L
S
R
F
C
K
E
H
REF
CKEL
WR
RD
PR
CKEL
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.
AS4C32M16D2A-25BIN
Alliance Memory Inc.
511 Taylor Way, San Carlos, CA 94070 TEL: [phone] FAX: [phone]
Alliance Memory Inc. reserves the right to change products or specification without notice
Rev.1.2
4
Jun./2014