Power On Sequence and CBR (auto) Refresh
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
T15
T16
T17
T18
T19
T20
T21
T22
CLK
/CLK
CKE
t
MRD
Low level is necessary
2 refresh cycles are necessary
/CS
/RAS
/CAS
/WE
BA0
BA1
A10
ADD
DM
ADDRESS KEY ADDRESS KEY
ADDRESS KEY
Hi-Z
Hi-Z
V
TT
TT
DQS
DQ
V
All Banks
Precharge
Command
All Banks
Precharge
Command
is necessary
Extended Mode
Register Set
Command
(DLL enable /
disable)
Mode
Refresh
Command
is necessary
Refresh
Command
is necessary
Mode
Activate
Command
Register Set
Command
(DLL reset)
is necessary
Register Set
Command
is necessary
is necessary
is necessary
t
MRD
t
MRD
t
RP
t
RFC
tRFC
More than 200 cycles are necessary before Read command