W988D6FB_13 Datasheet, PDF (19/66 Pages) Winbond – 256Mb Mobile LPSDR

W988D6FB / W988D2FB
256Mb Mobile LPSDR
Current State CS
H
L
L
L
Write
recovering
L
L
L
L
L
RAS
X
H
H
H
H
L
L
L
L
CAS WE
X
X
H
H
H
L
L
H
L
L
H
H
H
L
L
H
L
L
Address
X
X
X
BS, CA, A10
BS, CA, A10
BS, RA
BS, A10
X
Op-Code
Command
DSL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PREA
AREF/SELF
MRS/EMRS
Action
Nop → Maintain Row active after tWR
Nop → Maintain Row active after tWR
Nop → Maintain Row active after tWR
Begin Read
Begin new Write
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Notes
7
3
3
H
X
X
X
X
DSL
Nop → Enter precharge after tWR
L
H
H
H
X
NOP
Nop → Enter precharge after tWR
L
H
H
L
X
BST
Nop → Enter precharge after tWR
Write
L
H
L
H BS, CA, A10
READ/READA ILLEGAL
3
recovering
with auto
L
H
L
L
BS, CA, A10
WRIT/WRITA
ILLEGAL
3
precharge
L
L
H
H
BS, RA
ACT
ILLEGAL
3
L
L
H
L
BS, A10
PRE/PREA
ILLEGAL
3
L
L
L
H
X
AREF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS
ILLEGAL
H
X
L
H
L
H
Refreshing
L
H
L
L
L
L
X
X
H
H
H
L
L
X
H
X
L
X
X
DSL
Nop → Idle after tRFC
X
NOP
Nop → Idle after tRFC
X
BST
Nop → Idle after tRFC
X
READ/WRIT
ILLEGAL
X
ACT/PRE/PREA ILLEGAL
X
AREF/SELF/MRS/
EMRS
ILLEGAL
H
X
L
H
Mode register ^L
H
accessing
L
H
L
L
X
X
H
H
H
L
L
X
X
X
X
DSL
Nop → Idle after tMRD
X
NOP
Nop → Idle after tMRD
X
BST
ILLEGAL
X
READ/WRIT
ILLEGAL
ACT/PRE/PREA/
X
AREF/SELF/MRS/ ILLEGAL
EMRS
Note:
1. All entries assume that CKE was active (High level) during the preceding clock cycle and the current clock cycle (CKEn-1 = CKEn = ”1”)
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 : August 15, 2013
Revision A01-004