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Цитата:
After entry into the Test-Logic-Reset controller state as a result of the clocked operation of the TAP controller, the IDCODE instruction (or, if there is no device identification register, the BYPASS instruction) shall be latched onto the instruction register output on the falling edge of TCK.
Кстати, BYPASS задерживает на 1 бит. Если считывается вдвигаемое без задержки - это КЗ между TDI и TDO.
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