W948D6FBHX5E-TR Datasheet, PDF (9/60 Pages) Winbond – 256Mb Mobile LPDDR

W948D6FB / W948D2FB
5.2 Simplified State Diagram
256Mb Mobile LPDDR
Power
applied
Power
On
Precharge
All Bank
DPDSX
Deep
Power
Down
Self
Refresh
REFS
DPDS
REFSX
SRR
SRR
Read
Read
MRS
EMRS
MRS
Idle
All banks
precharged
REFA
Active
Power
Down
CKEL
CKEH
ACT
Precharge
Power
Down
CKEH
Auto
Refresh
CKEL
WRITE
WRITE
Row
Active
READ
WRITE
READA
WRITE
READ
Burst
Stop
BST
READ
READ
WRITEA
READA
READA
WRITE A
PRE PRE PRE
READ A
PRE
Precharge
PREALL
Automatic Sequence
Command Sequence
ACT =Active
EMRS= Ext . Mode Reg .Set
REFSX = Exit Self Refresh
BST = Burst Terminate
MRS = Mode Register Set
READ = Read w/o Auto Precharge
CKEL= Enter Power - Down
PRE = Precharge
READA = Read with Auto Precharge
CKEH =Exit Power - Down
PREALL = Precharge All Bank WRITE = Write w/o Auto Precharge
DPDS = Enter Deep Powe-r Down REFA = Auto Refresh
WRITEA = Write with Auto Precharge
DPDSX = Exit Deep Powe-r Down REFS = Enter Self Refresh
SRR = Status Register Read
Note: Use caution with this diagram . It is indented to provide a floorplan of the possible state transitions and commands to control them ^, not
all details .In particular situations involving more than one bank are not captured in full detall .
Publication Release Date : Oct, 15, 2012
-9-
Revision : A01-004