W9425G8EH Datasheet, PDF (17/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
8. OPERATION MODE
The following table shows the operation commands.
8.1 Simplified Truth Table
SYM.
COMMAND
DEVICE
STATE
CKEn-1
CKEn
DM⁽⁴⁾
BS0,
BS1
A10
A12,
A11,
A9-A0
CS RAS
CAS
WE
ACT
Bank Active
Idle⁽³⁾
H
X
X
V
V
V
LL
H
H
PRE
Bank Precharge
Any⁽³⁾
H
X
X
V
L
X
LL
H
L
PREA
WRIT
Precharge All
Write
Any
H
Active⁽³⁾
H
X
X
X
H
X
LL
H
L
X
X
V
L
V
LH
L
L
WRITA
Write with Auto-
precharge
Active⁽³⁾
H
READ Read
Active⁽³⁾
H
X
X
V
H
V
LH
L
L
X
X
V
L
V
LH
L
H
READA
Read with Auto-
precharge
Active⁽³⁾
H
X
X
V
H
V
LH
L
H
MRS
Mode Register Set Idle
H
X
X
L, L
C
C
L
L
L
L
EMRS
Extended Mode
Register Set
Idle
H
X
X H, L V
V
LL
L
L
NOP
No Operation
Any
H
X
X
X
X
X
LH
H
H
BST
Burst Read Stop
Active
H
X
X
X
X
X
LH
H
L
DSL
Device Deselect
Any
H
X
X
X
X
X
HX
X
X
AREF Auto Refresh
Idle
H
H
X
X
X
X
LL
L
H
SELF Self Refresh Entry Idle
H
L
X
X
X
X
LL
L
H
Idle
SELEX Self Refresh Exit
(Self
L
Refresh)
H
X
X
X
HX
X
X
X
LH
H
X
PD
Power Down
Mode Entry
Idle/
Active⁽⁵⁾
H
HX
X
X
L
X
X
X
X
LH
H
X
PDEX
Power Down
Mode Exit
Any
(Power
L
Down)
H
X
X
X
HX
X
X
X
LH
H
X
WDE
Data Write
Enable
Active
H
X
L
X
X
X
XX
X
X
WDD Data Write Disable Active
H
X
H
X
X
X
XX
X
X
Notes:
1. V = Valid X = Don’t Care L = Low level H = High level
2. CKEn signal is input level when commands are issued.
CKEn-1 signal is input level one clock cycle before the commands are issued.
3. These are state designated by the BS0, BS1 signals.
4. LDM, UDM (W9425G8EH).
5. Power Down Mode can not entry in the burst cycle.
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Publication Release Date: Jul. 04, 2008
Revision A01