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clifford
13:28
2110 8c8f
Gotcha!

The TCK pulses should be at least 0.5 ms long and all transitions of TDI, TDO and TMS should happen on the falling edge. So the clock cycle shown on the left is fine but the right one is a glitch:

The TCK pulse is to short (only a quarter of a ms). There is a TDI and TDO transition on the rising edge and the TDO pulse has only been captured in a single sample (sampling clock is 19kHz). I'd really like to see the analog levels of this event with a much higher time resolution on my scope. But unfortunately I don't have stuff like pulse width triggers on my scope so I fist need to build a trigger circuit.. (Nothing fancy. A small AVR program should do the trick.)
Tags: elektronik

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