參數(shù)資料
型號: W9425G6EH-4
廠商: WINBOND ELECTRONICS CORP
元件分類: DRAM
英文描述: 16M X 16 DDR DRAM, 0.7 ns, PDSO66
封裝: 0.400 INCH, ROHS COMPLIANT, TSOP2-66
文件頁數(shù): 47/54頁
文件大?。?/td> 0K
代理商: W9425G6EH-4
W9425G6EH
Publication Release Date:Dec. 03, 2008
- 51 -
Revision A08
11.23 Auto Refresh Cycle
CMD
CLK
PREA
AREF
CMD
NOP
tRP
tRFC
Note: CKE has to be kept “High” level for Auto-Refresh cycle.
11.24 Precharged/Active Power Down Mode Entry and Exit Timing
CMD
CLK
NOP
CMD
NOP
Exit
Entry
CMD
NOP
tIH
tIS
tCK
tIH
tIS
CKE
Precharge/Activate
Note 1,2
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
NOP
DLL
RESET
NOP
CMD
200 clocks
tIS
Frequency Change
Occurs here
Minmum 2 clocks
required before
changing frequency
Stable new clock
before power down exit
CLK
CMD
CKE
tRP
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