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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MB91F587LD датащи(PDF) 158 Page - SPANSION |
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MB91F587LD датащи(HTML) 158 Page - SPANSION |
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158 / 177 page  D at aS h ee t August 22, 2014, MB91F587LA_DS705-00012-2v0-E 155 CONFIDENTIAL (12) External bus I/F (Asynchronous mode) timing (TA: Recommended operating conditions, VCC = AVCC=5.0V±10%, VSS=AVSS=0.0V) (External load capacitance 50pF) Parameter Symbol Pin name Value Unit Remarks Min Max Cycle time tCYC SYSCLK 25 - ns Address setup → RDX ↑ time tASRH RDX, A00 to A21 2 × tCYC – 12 2 × tCYC + 12 ns RWT=1, set RWT to 1 or more.* RDX ↑ → Address hold tRHAH tCYC – 12 tCYC + 12 ns Set RDCS to 1 or more. Data setup → RDX ↑ time tDSRH RDX, D16 to D31 18 +tCYC - ns RWT=1, set RWT to 1 or more. RDX ↑ → Data hold tRHDH 0 - ns Address setup → WRnX ↑ time tASWH WR0X to WR1X, A00 to A21 tCYC – 12 tCYC + 12 ns WWT=0. * WRnX ↑ → Address hold tWHAH tCYC – 12 tCYC + 12 ns Set WRCS to 1 or more. Data setup → WRnX ↑ time tDSWH WR0X to WR1X, D16 to D31 tCYC – 16 tCYC + 16 ns WWT=0. * WRnX ↑ → Data hold tWHDH tCYC – 16 tCYC + 16 ns Set WRCS to 1 or more. Address setup → ASX ↑ time tMASASH ASX, D16 to D31 tCYC – 16 tCYC + 16 ns ASCY=0. ASX ↑ → Address hold tMASHAH tCYC – 16 tCYC + 16 ns In multiplex mode, set as follows: • Set CSWR and CSRD to 2 or more. • Set to ADCY>ASCY. To prevent protocol violation, satisfy the following conditions: ADCY + 1 ≤ ACS + CSRD ADCY + 1 ≤ ACS + CSWR ASCY + 1 ≤ ACS + CSRD ASCY + 1 ≤ ACS + CSWR For details, see Hardware Manual. *: If the bus is expanded by automatic wait insertion or RDY input, add time (tCYC × the number of expanded cycles) to the rated value. |
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