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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PPC440GP-3CC466C 데이터시트(PDF) 72 Page - Applied Micro Circuits Corporation |
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PPC440GP-3CC466C 데이터시트(HTML) 72 Page - Applied Micro Circuits Corporation |
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72 / 83 page  440GP – Power PC 440GP Embedded Processor 72 AMCC Revision 1.07 – October 4, 2007 Data Sheet DDR SDRAM Write Operation The following diagram illustrates the relationship among the signals involved with a DDR write operation. DDR SDRAM Write Cycle Timing DQS MemData PLB Clk MemClkOut0 MemClkOut0(90) Addr/Cmd TSK TSA THA TDS TDS TSD THD TSD THD TSA = Setup time for address and command signals to MemClkOut0(90) TSK = Delay from rising edge of MemClkOut0(0) to rising/falling edge of signal (skew) THA = Hold time for address and command signals from MemClkOut0(90) TDS = Delay from rising/falling edge of clock to the rising/falling edge of DQS TSD = Setup time for data signals (minimum time data is valid before rising/falling edge of DSQ) THD = Hold time for data signals (minimum time data is valid after rising/falling edge of DSQ) |
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