W9425G6KH-5-TR Datasheet, PDF (17/52 Pages) Winbond – 4 M 4 BANKS 16 BITS DDR SDRAM

W9425G6KH
9. OPERATION MODE
The following table shows the operation commands.
9.1 Simplified Truth Table
SYM.
COMMAND
ACT
Bank Active
PRE
Bank Precharge
PREA Precharge All
WRIT Write
WRITA
Write with Auto-
precharge
READ Read
READA
Read with Auto-
precharge
MRS Mode Register Set
EMRS
Extended Mode
Register Set
NOP
No Operation
BST
Burst Read Stop
DSL
Device Deselect
AREF Auto Refresh
SELF Self Refresh Entry
SELEX Self Refresh Exit
DEVICE
STATE
CKEn-1 CKEn
DM⁽⁴⁾
Idle⁽³⁾
H
X
X
Any⁽³⁾
H
X
X
Any
H
X
X
Active⁽³⁾
H
X
X
Active⁽³⁾
H
X
X
Active⁽³⁾
H
X
X
Active⁽³⁾
H
X
X
Idle
H
X
X
Idle
H
X
X
Any
H
X
X
Active
H
X
X
Any
H
X
X
Idle
H
H
X
Idle
H
L
X
Idle (Self
Refresh)
L
H
X
PD
Power Down
Mode Entry
Idle/
Active⁽⁵⁾
H
L
X
PDEX
Power Down
Mode Exit
Any (Power
Down)
L
H
X
WDE Data Write Enable
Active
H
X
L
WDD Data Write Disable Active
H
X
H
BA0,
BA1
V
V
X
V
V
V
V
L, L
H, L
X
X
X
X
X
X
X
X
X
X
A12,
A10 A11, _{CS RAS}
A9-A0
V
V
LL
L
X
LL
H
X
LL
L
V
LH
H
V
LH
L
V
LH
H
V
LH
LL
Op-Code⁽⁶⁾
LL
X
X
LH
X
X
LH
X
X
HX
X
X
LL
X
X
LL
HX
X
X
LH
HX
X
X
LH
HX
X
X
LH
X
X
XX
X
X
XX
CAS W E
H
H
H
L
H
L
L
L
L
L
L
H
L
H
L
L
L
L
H
H
H
L
X
X
L
H
L
H
X
X
H
X
X
X
H
X
X
X
H
X
X
X
X
X
Notes
1. V = Valid X = Don’t Care L = Low level H = High level.
2. CKE_n signal is input level when commands are issued
CKE_n-1 signal is input level one clock cycle before the commands are issued
3. These are state designated by the BA0, BA1 signals.
4. LDM, UDM (W9425G6KH)
5. Power Down Mode can not entry in the burst cycle.
6. BA0, BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register; BA0 = 1, BA1 =
0 selects Extended Mode Register; other combinations of BA0, BA1 are reserved; A0~A12 provide the op-code to be written
to the selected Mode Register (MRS or EMRS).
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Publication Release Date: Nov. 17, 2014
Revision: A02