W949D6DB Datasheet, PDF (23/60 Pages) Winbond – Standard Self Refresh Mode

W949D6DB / W949D2DB
9. The following states must not be interrupted by any executable command; DESEDECT or NOP commands must be applied
to each positive clock edge during these states.
Refreshing: Starts with registration of an AUTO REFRESH command and ends when tRFC is met. Once tRFC is met, the
LPDDR will be in an ‘all banks idle’ state.
Accessing Mode Register: starts with registration of a MODE REGISTER SET command and ends when tMRD has been met.
Once tMRD is met, the LPDDR will be in an ‘all banks idle’ state.
Precharging All: starts with the registration of a PRECHARGE ALL command and ends when tRP is met. Once tRP is met, the
bank will be in the idle state.
10. Not bank-specific; requires that all banks are idle and no bursts are in progress.
11. Not bank-specific. BURST TERMINATE affects the most recent READ burst, regardless of bank.
12. Requires appropriate DM masking.
13. A WRITE command may be applied after the completion of the READ burst; otherwise, a BURST TERMINATE must be
used to end the READ prior to asserting a WRITE command.
7.6.6 Truth Table - Current State Bank n, Command to Bank m
CURRENT
STATE
CS
H
Any
L
Idle
X
L
Row Activating, _L
Active, or
Precharging ^L
L
L
Read with Auto _L
Precharge
disabled
L
L
L
Write with Auto _L
Precharge
disabled
L
L
L
Read with
L
Auto Precharge _L
L
L
Write with Auto ^L
Precharge
L
L
RAS CAS WE
X
XX
H
HH
X
XX
L
HH
H
LH
H
L
L
L
HL
L
HH
H
LH
H
L
L
L
HL
L
HH
H
LH
H
L
L
L
HL
L
HH
H
LH
H
L
L
L
HL
L
HH
H
LH
H
L
L
L
HL
COMMAND
DESELECT
NOP
ANY
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTION
NOTES
NOP or Continue previous Operation
NOP or Continue previous Operation
Any command allowed to bank m
Select and activate row
Select column & start read burst
Select column & start write burst
Precharge
Select and activate row
Select column & start new read burst
Select column & start write burst
Precharge
Select and activate row
Select column & start read burst
Select column & start new write burst
Precharge
Select and activate row
Select column & start new read burst
Select column & start write burst
Precharge
Select and activate row
Select column & start read burst
Select column & start new write burst
Precharge
8
8
8
8,10
8, 9
8
5, 8
5, 8, 10
5, 8
5, 8
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Publication Release Date: Oct. 08, 2014
Revision: A01-003