W9412G6JH
11.23 Auto Refresh Cycle
CLK
CLK
PREA
NOP
tRP
AREF
NOP
tRFC
AREF
CMD
CMD
NOP
tRFC
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
tIH
tIS
tCK
tIH
tIS
CKE
Precharge/Activate
Note 1,2
Entry
Exit
NOP
CMD
CMD
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
DLL
RESET
NOP
NOP
NOP
tIS
NOP
NOP
CMD
CMD
CKE
Frequency Change
Occurs here
200 clocks
tRP
Stable new clock
before power down exit
Minmum 2 clocks
required before
changing frequency
Publication Release Date: Nov. 29, 2011
Revision A03
- 50 -
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