EM638165 Etron Technology Inc., EM638165 Datasheet - Page 23

• Manufacturer Part Number: EM638165
• Description: 4Mega x 16 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".
To Exit SelfRefresh Mode
1. System clock restart and be stable before returning CKE high.
2. Enable CKE and CKE should be set high for minimum time of t
3. CS# starts from high.
4. Minimum t
5. 2048 cycles of burst AutoRefresh is required before SelfRefresh entry and after SelfRefresh exit if the
Preliminary
A0-A9,A11
Once the device enters SelfRefresh mode, minimum t
system uses burst refresh.
BA0,1
RAS#
CAS#
DQM
WE #
CLK
CKE
CS#
DQ
T0
RC
*Note 8
Self Refresh Enter
is required after CKE going high to complete SelfRefresh exit.
T1
*Note 1
t
IS
Hi-Z
T2
*Note 2
T3
T4
T5
T6
*Note 3
T7
T8
23
T9
RAS
T10
Hi-Z
*Note 4
is required before exit from SelfRefresh.
SelfRefresh Exit
T11
*Note 5
t
*Note 6
SRX
SRX
T12
t
RC(min)
.
T13
T14
*Note 7
T15
AutoRefresh
*Note 8
Rev 0.6
T16
t
PDE
EM638165
T17
T18
Feb. 2001
T19