W988D6FB_13 Datasheet, PDF (16/66 Pages) Winbond – 256Mb Mobile LPSDR

W988D6FB / W988D2FB
8. FUNCTION DESCRIPTION
256Mb Mobile LPSDR
8.1 Command Function
8.1.1 Truth Table
(Note (1) and (2) )
Symbol
Command
BS0,
Device State
CKEn-1 CKEn DQM(5)
A10
Address
CS
RAS
CAS
WE
BS1
ACT Bank Activate
Idle (3)
H
X
X
V
V
V
L
L
H
H
PRE Bank Precharge
Any
H
X
X
V
L
X
L
L
H
L
PREA Precharge All
Any
H
X
X
X
H
X
L
L
H
L
WRIT Write
Active (3)
H
X
X
V
L
V
L
H
L
L
WRITA Write with Auto Precharge
Active (3)
H
X
X
V
H
V
L
H
L
L
READ Read
Active (3)
H
X
X
V
L
V
L
H
L
H
READA Read with Auto Precharge
Active (3)
H
X
X
V
H
V
L
H
L
H
MRS Mode Register Set
Idle
H
X
X
V
V
V
L
L
L
L
EMRS
Extended Mode Register
Set
Idle
H
X
X
V
V
V
L
L
L
L
NOP No-Operation
Any
H
X
X
X
X
X
L
H
H
H
BST Burst stop
Active (4)
H
X
X
X
X
X
L
H
H
L
DSL Device Deselect
Any
H
X
X
X
X
X
H
X
X
X
AREF Auto-Refresh
Idle
H
H
X
X
X
X
L
L
L
H
SELF Self-Refresh Entry
Idle
H
L
X
X
X
X
L
L
L
H
SELEX Self-Refresh Exit
Idle
H
X
X
X
L
H
X
X
X
X
(Self Refresh)
L
H
H
H
CSE
Clock Suspend Mode
Entry
Active
H
L
X
X
X
X
X
X
X
X
H
X
X
X
PD
Power Down Mode Entry Idle/Active (6)
H
L
X
X
X
X
L
H
H
H
CSEX Clock Suspend Mode Exit
Active
L
H
X
X
X
X
X
X
X
X
Any
H
X
X
X
PDEX Power Down Mode Exit
L
H
X
X
X
X
(Power Down)
L
H
H
X
DE
Data Write/Output Enable
Active
H
X
L
X
X
X
X
X
X
X
DD
Data Write/Output Disable
Active
H
X
H
X
X
X
X
X
X
X
DPD
Deep Power Down Mode
Entry
Idle
H
L
X
X
X
X
L
H
H
L
DPDE
Deep Power Down Mode
Exit
Idle (DPD)
L
H
X
X
X
X
X
X
X
X
Note
1. V = Valid, × = 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. Device state is Full Page Burst operation.
5. x32: DQM0-3, x16 : LDQM / UDQM
6. Power Down Mode cannot entry in the burst cycle.
When this command assert in the burst cycle, device state is clock suspend mode.
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Publication Release Date : August 15, 2013
Revision A01-004