EM6A9320 Etron Technology Inc., EM6A9320 Datasheet - Page 15

• Manufacturer Part Number: EM6A9320
• Description: 4M x 32 DDR SDRAM
• Manufacturer: Etron Technology Inc.

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Figure 10. Self Refresh Timimg
Figure 11. Precharge Command
Figure 12. Power Up Sequence
Figure 13. Mode Register Set Timing
Figure 14. Power Down Mode
Etron Confidential
CK
CMD
CKE
CK
CMD
A0-11
BA0-1
CK
CMD
CK
CMD
CK
CMD
CKE
Self Refresh Entry
Precharge All
PREA
SREF
Power Down Mode Entry
ACT
PRE
RA
BA
NOP
wait 200uS
Power Up
200uS
NOP
t
t
RP
RAS
MRS set
Self Refresh Exit
NOP
NOP
MRS
SRE
PRE
Precharge All
t
BA
RC
1xCK
PREA
CMD
t
200xCK
RP
After 1 x CK, Command can be active
t
NOP
MRD
t
SREX
Power Down Mode Exit
t
NOP
RP
ACT
RA
BA
After 200 x CK, Command can be active
EMRS set
t
PDEX
EMRS
CMD
4Mx32 DDR SDRAM
t
CMD
MRD
MRS set
Reset DLL
with A8=H
15
MRS
200xCK
Precharge All
PREA
t
RP
ARE
Auto Refresh
2 or more
Rev 0.3
ARE
EM6A9320
t
RFC
MRS set
with A8=L
MRS
July. 2002