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TMS320VC5502 データシート(PDF) 124 Page - Texas Instruments |
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TMS320VC5502 データシート(HTML) 124 Page - Texas Instruments |
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124 / 189 page  www.ti.com nanoseconds (ns) 0 2 1 3 0 5 10 15 -1 20 4 2.5 V 0.6 V 0.1 mF SN74LVC1G32 R32 33 W SN74LVC1G32 0.1 mF 3.3 V 3.3 V TCK 2 4 8 10 12 14 1 3 5 7 9 11 13 XDS TRST XDS EMU1 TRST EMU1/OFF EMU0 3.3 V TMS TDI TDO XDS TMS XDS TDI XDS TDO XDS TCK RTN XDS TCK XDS EMU0 TMS320VC5502 Fixed-Point Digital Signal Processor SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004 Figure 3-54. Good TCK Transition As the problem may be caused by one or more of the above factors, one or more of the steps outlined below may be necessary to fix it: • Avoid using a socket • Ensure the board design achieves rise times and fall times of less than 3 ns with clean monotonic edges for the TCK signal. • For designs where TCK is supplied by the emulation pod, implement noise filtering circuitry on the target board. A sample circuit is shown in Figure 3-55. Figure 3-55. Sample Noise Filtering Circuitry 124 Functional Overview |
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