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Altera_Forum's avatar
Altera_Forum
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9 years ago

Weird SignalTap behaviour

Trying to solve a mystery, but after several days ran out of thoughts :( Needed to connect to SignalTap around 100 (probably, a bit less) signals, and at some moment got very strange picture (...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

I tried the reread operation - did not help.

I'm doubtful JTAG transmission is an unlikely culprit as this only occurs on some builds and when it does happen it fails repeatedly.

I have noticed that it fails when I push the capture clock frequency. I still don't suspect metastability because the source signal is stable.

However, when I relax the clock with a lower frequency the problem goes away.