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If it fails in RTL simulation (not gate level) then that tells you there is something wrong with some code somewhere.
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Apparently it is, thanks. I found timing issue which only happened in that particular project.
With the root problem, which is related to optimization:
Originally I had my UART driver, which works fine for some random time ( 1 - 10 minutes, and then suddenly stuck.
ExternalPullUp solution which preserves all states unoptimized, or running with SignalTap and monitoring some states fixes it.
I suspect it should be something wrong with my code, but I spent 3 weeks debugging it and gave up.
Honored Contributor
