參數(shù)資料
      型號: K4H1G0438B-TCB0
      廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
      英文描述: 128Mb DDR SDRAM
      中文描述: 128MB DDR SDRAM的
      文件頁數(shù): 32/53頁
      文件大?。?/td> 669K
      代理商: K4H1G0438B-TCB0
      - 32 -
      REV. 1.0 November. 2. 2000
      128Mb DDR SDRAM
      3.3.14 Power down
      CKE
      Precharge
      Active
      Active
      power
      down
      Exit
      Read
      Active
      power
      down
      Entry
      power
      down
      Entry
      Precharge
      Command
      CK
      CK
      The power down mode is entered when CKE is low and exited when CKE is high. Once the power down
      mode is initiated, all of the receiver circuits except clock, CKE and DLL circuit tree are gated off to reduce
      power consumption. All banks should be in idle state prior to entering the precharge power down mode and
      CKE should be set high at least 1tck+tIS prior to row active command . During power down mode, refresh
      operations cannot be performed, therefore the device cannot be remained in power down mode longer than
      the refresh period(Data retension time) of the device.
      Figure 23. Power down entry and exit timing
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