W989D6DB Datasheet, PDF (51/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
11.12 Self Refresh Cycle
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
CLK
CS
t_RP
RAS
CAS
WE
BA0,BA1
A10
Address
DQM
t_SB
t_CKS
t_CKS
CKE
t_CKS
DQ
t_RFC
All Bank Self Refresh
Precharge
Entry
Self Refresh
Exit
Device Deselect (DSL) Cycle
Arbitrary Cycle
Note: The device exit the Self Refresh mode asynchronously at the rising edge of the CKE signal.
After CKE goes high, the Device Deselect or No-operation command must be registered at the immediately following
CLK rising edge, and CKE must remain high at least for tCKS delay immediately after exit the Self Refresh Mode.
A bust of 8K auto refeesh cycle within 7.8μs before entering and exiting is necessary if the system does not use the
auto refresh function.
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Publication Release Date: Mar. 19, 2014
Revision: A01-001