em636165 Etron Technology Inc., em636165 Datasheet - Page 26

• Manufacturer Part Number: em636165
• Description: 1m X 16 Bit Synchronous Dram Sdram
• Manufacturer: Etron Technology Inc.

Figure 5. Self Refresh Entry & Exit Cycle
Note: To Enter SelfRefresh 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 SelfRefresh mode as long as CKE stays "low".
4. Once the device enters SelfRefresh mode, minimum t
5. System clock restart and be stable before returning CKE high.
6. Enable CKE and CKE should be set high for valid setup time and hold time.
7. CS# starts from high.
8. Minimum t
9. 4096 cycles of burst AutoRefresh is required before SelfRefresh entry and after SelfRefresh exit if the
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To Exit SelfRefresh Mode
system uses burst refresh.
WE#
DQM
DQ
A0-A9
CLK
CKE
CS#
RAS#
CAS#
A11
T0
XSR
*Note 8
T1
*Note 1
is required after CKE going high to complete SelfRefresh exit.
Self Refresh Enter
t
IS
T2
Hi-Z
*Note 2
T3
T4
T5
T6
*Note 3
T7
T8
T9 T10
26
Hi-Z
RAS
*Note 4
T11 T12 T13 T14 T15 T16 T17 T18 T19
Self Refresh Exit
is required before exit from SelfRefresh.
*Note 5
*Note 6
t
IS
t
IH
tXSR
*Note 7
Auto Refresh
t
PDE
Rev. 3.4
*Note 8
EM636165
“H” or “L”
Apr. 2008