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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TNETV2501INPGF датащи(PDF) 133 Page - Texas Instruments |
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TNETV2501INPGF датащи(HTML) 133 Page - Texas Instruments |
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133 / 197 page  Functional Overview 133 December 2002 − Revised November 2008 SPRS206K 0 4 2 1 3 0 5 10 15 −1 20 nanoseconds (ns) 2.5 V 0.6 V Figure 3−53. Bad TCK Transition nanoseconds (ns) 0 2 1 3 0 5 10 15 −1 20 4 2.5 V 0.6 V 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. |
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