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TMS320F Datasheet(PDF) 343 Page - Texas Instruments |
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TMS320F Datasheet(HTML) 343 Page - Texas Instruments |
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343 / 389 page  Emulation Timing Calculations C-8 Example C–1. Key Timing for a Single-Processor System Without Buffers - The following example calculates key timing for a single-processor system without buffers. t pd TCK_RET-TMS TDI + t d TMSmax ) tsu TTMS t TCKfactor + (20 ns ) 10 ns) 0.4 + 75 ns, or 13.3 MHz t pd TCK_RET–TDO + t d TTDO ) tsu TDOmin t TCKfactor + (15 ns ) 3ns) 0.4 + 45 ns, or 22.2 MHz In the preceding example, the TCK_RET-to-TMS/TDI path is the limiting factor because it requires more time to complete. - The following example calculates key timing for a single- or multiple-pro- cessor system with buffered input and output: t pd (TCK_RET-TMS TDI) + t d(TMSmax) ) tsu (TTMS) ) t bufskew t TCKfactor + (20 ns ) 10 ns ) 1.35 ns) 0.4 + 78.4 ns, or 12.7 MHz t pd (TCK_RET–TDO) + t d (TTDO) ) tsu (TDOmin) ) td (bufmax) t TCKfactor + 70 ns, or 14.3 MHz + (15 ns ) 3ns ) 10 ns) 0.4 In the preceding example, the TCK_RET-to-TMS/TDI path is the limiting factor becaise it requires more time to complete. |
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