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W9425G6EH
11.23 Auto Refresh Cycle
CLK
CLK
CMD
PREA
NOP
AREF
NOP
AREF
NOP
CMD
t RP
t RFC
t RFC
Note: CKE has to be kept “High” level for Auto-Refresh cycle.
11.24 Precharged/Active Power Down Mode Entry and Exit Timing
CLK
CLK
t IH
t IS
t CK
t IH
t IS
CKE
Precharge/Activate
Note 1,2
Entry
Exit
CMD
CMD
NOP
NOP
CMD
NOP
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
NOP
NOP
NOP
DLL
RESET
NOP
NOP
CMD
CKE
Frequency Change
Occurs here
t IS
t RP
Minmum 2 clocks
required before
Stable new clock
before power down exit
200 clocks
changing frequency
Publication Release Date:Dec. 03, 2008
- 51 -
Revision A08
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