W9425G6EH Datasheet, PDF (20/50 Pages) Winbond – 4 M × 4 BANKS × 16 BITS DDR SDRAM

W9425G6EH
Function Truth Table, continued
CURRENT
STATE
CS RAS CAS WE ADDRESS
COMMAND
H X X XX
DSL
L H H HX
NOP
L H H LX
BST
L H L H BA, CA, A10 READ/READA
Write
L H L L BA, CA, A10 WRIT/WRITA
Recovering
L L H H BA, RA
ACT
L L H L BA, A10
PRE/PREA
L L L HX
AREF/SELF
L L L L Op-Code
MRS/EMRS
ACTION
NOP->Row active after tWR
NOP->Row active after tWR
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
NOTES
3
3
3
3
H X X XX
DSL
L H H HX
NOP
L H H LX
BST
Write
L H L H BA, CA, A10 READ/READA
Recovering
with Auto-
L
H
L
L BA, CA, A10 WRIT/WRITA
precharge
L L H H BA, RA
ACT
L L H L BA, A10
PRE/PREA
L L L HX
AREF/SELF
L L L L Op-Code
MRS/EMRS
NOP->Enter precharge after tWR
NOP->Enter precharge after tWR
ILLEGAL
ILLEGAL
3
ILLEGAL
3
ILLEGAL
3
ILLEGAL
3
ILLEGAL
ILLEGAL
H X X XX
L H H HX
L H H LX
Refreshing
L H L HX
L L H XX
L L L XX
DSL
NOP
BST
READ/WRIT
ACT/PRE/PREA
AREF/SELF/MRS/EMRS
NOP->Idle after tRC
NOP->Idle after tRC
ILLEGAL
ILLEGAL
ILLEGAL
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 (BA), 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:Apr. 11, 2008
Revision A04