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56F807 Datasheet(PDF) 34 Page - Freescale Semiconductor, Inc |
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56F807 Datasheet(HTML) 34 Page - Freescale Semiconductor, Inc |
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34 / 60 page  56F807 Technical Data Technical Data, Rev. 15 34 Freescale Semiconductor Figure 3-11 External Bus Asynchronous Timing 1. Timing is both wait state and frequency dependent. In the formulas listed, WS = the number of wait states and T = Clock Period. For 80MHz operation, T = 12.5ns. 2. Parameters listed are guaranteed by design. To calculate the required access time for an external memory for any frequency < 80MHz, use this formula: Top = Clock period @ desired operating frequency WS = Number of wait states Memory Access Time = (Top*WS) + (Top- 11.5) A0–A15, PS, DS (See Note) WR D0–D15 RD Note: During read-modify-write instructions and internal instructions, the address lines do not change state. Data In Data Out tAWR tARDA tARDD tRDA tRD tRDRD tRDWR tWRWR tWR tDOS tWRD tWRRD tAD tDOH tDRD tRDD |
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