AMS73CAG01808RA
Simplified State Diagram
CKE L
Power
applied
MRS, MPR,
write
Reset
Power
on
Self
Initialization
procedure
refresh
leveling
SRE
ZQCL
MRS
SRX
REF
From any
state
RESET
ZQCL/ZQCS
ZQ
Idle
Refreshing
calibration
PDE
PDX
ACT
Active
power-
down
Precharge
Activating
power-
down
PDX
PDE
CKE L
CKE L
READ
Bank
active
WRITE
READ
WRITE
WRITE AP
WRITE
READ AP
READ
Reading
Writing
WRITE AP
READ AP
WRITE AP
READ AP
PRE, PREA
Reading
Writing
PRE, PREA
PRE, PREA
Precharging
Automatic
sequence
Command
sequence
SRX = Self refresh exit
PREA = PRECHARGE ALL
READ = RD, RDS4, RDS8
ACT = ACTIVATE
WRITE = WR, WRS4, WRS8
MPR = Multipurpose register
MRS = Mode register set
PDE = Power-down entry
PDX = Power-down exit
PRE = PRECHARGE
WRITE AP = WRAP, WRAPS4, WRAPS8
ZQCL = ZQ LONG CALIBRATION
ZQCS = ZQ SHORT CALIBRATION
READ AP = RDAP, RDAPS4, RDAPS8
REF = REFRESH
RESET = START RESET PROCEDURE
SRE = Self refresh entry
AMS73CAG01808RA Rev. 1.0 December 2010
6
AMS [ Advanced Monolithic Systems Ltd ]
