A43E26161
10. Clock Suspend Exit & Power Down Exit
1) Clock Suspend (=Active Power Down) Exit
CLK
2) Power Down (=Precharge Power Down) Exit
CLK
CKE
CKE
t
SS
t
SS
Note 2
Note 1
Internal
CLK
Internal
CLK
NOP
ACT
RD
CMD
CMD
11. Auto Refresh & Self Refresh
Note 3
1) Auto Refresh
CLK
Note 4
Note 5
CKE
PRE
Internal
CLK
AR
CMD
CMD
t
RP
tRC
Note 6
2) Self Refresh
CLK
Note 4
CMD
CKE
PRE
SR
CMD
t
RP
tRC
* Note : 1. Active power down : one or more bank active state.
2. Precharge power down : both bank precharge state.
3. The auto refresh is the same as CBR refresh of conventional DRAM.
No precharge commands are required after Auto Refresh command.
During tRC from auto refresh command, other command can not be accepted.
4. Before executing auto/self refresh command, both banks must be idle state.
5. MRS, Bank Active, Auto/Self Refresh, Power Down Mode Entry.
6. During self refresh mode, refresh interval and refresh operation are performed internally.
After self refresh entry, self refresh mode is kept while CKE is LOW.
During self refresh mode, all inputs expect CKE will be don’t cared, and outputs will be in Hi-Z state.
During tRC from self refresh exit command, any other command can not be accepted.
Before/After self refresh mode, burst auto refresh cycle (4K cycles ) is recommended.
(December, 2004, Version 1.0)
19
AMIC Technology, Corp.
AMICC [ AMIC TECHNOLOGY ]
