W9425G8EH Datasheet, PDF (20/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
Function Truth Table, continued
CURRENT
STATE
CS RAS CAS WE
ADDRESS
COMMAND
ACTION
NOTES
H X X XX
L H H HX
L H H LX
DSL
NOP
BST
NOP->Row active after tWR
NOP->Row active after tWR
ILLEGAL
L H L H BS, CA, A10 READ/READA
ILLEGAL
3
Write
L H L L BS, CA, A10 WRIT/WRITA
ILLEGAL
3
Recovering
L L H H BS, RA
ACT
ILLEGAL
3
L L H L BS, A10
PRE/PREA
ILLEGAL
3
L L L HX
AREF/SELF
ILLEGAL
L L L L Op-Code
MRS/EMRS
ILLEGAL
H X X XX
DSL
L H H HX
NOP
L H H LX
BST
Write
L H L H BS, CA, A10 READ/READA
Recovering
with Auto-
L
H
L
L BS, CA, A10 WRIT/WRITA
precharge
L L H H BS, RA
ACT
NOP->Enter precharge after tWR
NOP->Enter precharge after tWR
ILLEGAL
ILLEGAL
3
ILLEGAL
3
ILLEGAL
3
L L H L BS, A10
PRE/PREA
ILLEGAL
3
L L L HX
L L L L Op-Code
AREF/SELF
MRS/EMRS
ILLEGAL
ILLEGAL
H X X XX
L H H HX
L H H LX
Refreshing
L H L HX
DSL
NOP
BST
READ/WRIT
NOP->Idle after tRC
NOP->Idle after tRC
ILLEGAL
ILLEGAL
L L H XX
ACT/PRE/PREA
ILLEGAL
L L L XX
AREF/SELF/MRS/EMRS ILLEGAL
Mode
Register
Accessing
H X X XX
L H H HX
L H H LX
L H L XX
L L X XX
DSL
NOP
BST
READ/WRIT
ACT/PRE/PREA/ARE
F/SELF/MRS/EMRS
NOP->Row after tMRD
NOP->Row after tMRD
ILLEGAL
ILLEGAL
ILLEGAL
Notes:
1. All entries assume that CKE was active (High level) during the preceding clock cycle and the current clock cycle.
2. Illegal if any bank is not idle.
3. Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BS), depending on the
state of that bank.
4. Illegal if tRCD is not satisfied.
5. Illegal if tRAS is not satisfied.
6. Must satisfy burst interrupt condition.
7. Must avoid bus contention, bus turn around, and/or satisfy write recovery requirements.
8. Must mask preceding data which don’t satisfy tWR.
Remark: H = High level, L = Low level, X = High or Low level (Don’t Care), V = Valid data
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Publication Release Date: Jul. 04, 2008
Revision A01