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Altera_Forum
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12 years ago

Finite state machine - doesnt change state second time & glitch

I have a fairly simple state machine that when in idle state, if txval is high should take the data from input port, put txbus flag to 1, then write it to FT245 chip and when writing is finished and ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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Yes, but as you havent included the delay counter on the diagram, you cannot see whether the counter is at 0 yet. Given it has just changed state 5 clocks previous, and needs 10 clocked before changing again, I suspect the counter isnt at 0 yet, hence cannot change state.

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I have added counter output to my waveform and the issue is there. I will post correct code when debugged.