M12S64164A Datasheet, PDF (40/45 Pages) Elite Semiconductor Memory Technology Inc. – 1M x 16 Bit x 4 Banks Synchronous DRAM

ESMT
M12S64164A
Self Refresh Entry & Exit Cycle
0
12
3
4
5 6 7 8 9 10
11 12 13 14 15 16 17 18 19
CLOCK
CKE
*Note2
*Note1
tSS
*Note3
*Note4
t R FC min
*Note6
CS
*Note5
RAS
CAS
*Note7
ADDR
BA0,BA1
A10/AP
DQ
Hi-Z
Hi-Z
WE
DQM
Self Refresh Entry
Self Refresh Exit
Auto Refresh
: Don't care
*Note: TO ENTER SELF REFRESH MODE
1. CS , RAS & CAS with CKE should be low at the same clock cycle.
2. After 1 clock cycle, all the inputs including the system clock can be don’t care except for CKE.
3. The device remains in self refresh mode as long as CKE stays “Low”.
cf.) Once the device enters self refresh mode, minimum t_RAS is required before exit from self refresh.
TO EXIT SELF REFRESH MODE
4. System clock restart and be stable before returning CKE high.
5. CS starts from high.
6. Minimum t_RFC is required after CKE going high to complete self refresh exit.
7. 4K cycles of burst auto refresh is required immediately before self refresh entry and immediately after self refresh exit.
Elite Semiconductor Memory Technology Inc.
Publication Date: Apr. 2009
Revision: 1.2
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