EM68B16DVAA
EtronTech
Timing Waveforms
Figure 5. Initialization Waveform Sequence
VDD
VDDQ
200 µS
tCK
tRP
tRFC
tRFC
tMRD
tMRD
CK
CK
CKE
NOP
PRE
ARF
ARF
MRS
CODE
CODE
MRS
CODE
CODE
ACT
RA
Command
Address
A10
All
Banks
RA
BA0=L
BA1=L
BA0=L
BA1=H
BA
BA0,1
DM
(High-Z)
DQ,DQS
VDD / VDDQ powered up
Clock stable
Load
Mode Reg.
Load
Ext. Mode Reg.
Don’t Care
Figure 6. Basic Timing Parameters for Commands
tCK
tCH tCL
CK
CK
tIS tIH
Valid
Valid
Valid
Input
Don’t Care
Notes: Input = A0 - A12, BA0,BA1, CKE, CS, RAS, CAS, WE;
Etron Confidential
18
Rev. 1.0
Mar. 2009