W9464G6IH Datasheet, PDF (51/54 Pages) Winbond – 1M × 4 BANKS × 16 BITS DDR SDRAM

11.23 Auto Refresh Cycle
W9464G6IH
Note: CKE has to be kept “High” level for Auto-Refresh cycle.
11.24 Precharge/Activate Power Down Mode Entry and Exit Timing
Note:
1. If power down occurs when all banks are idle, this mode is referred to as precharge power down.
2. If power down occurs when there is a row active in any bank, this mode is referred to as active power down.
11.25 Input Clock Frequency Change during Precharge Power Down Mode Timing
CLK
CLK
CMD
CKE
NOP NOP
Frequency Change
Occurs here
NOP
tIS
DLL
RESET
NOP
NOP
CMD
tRP
200 clocks
Minmum 2 clocks
required before
changing frequency
Stable new clock
before power down exit
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Publication Release Date:Mar. 17, 2010
Revision A04