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amildm's avatar
amildm
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4 years ago

[SignalTap] Hot to trigger on the NOT condition

Hi All, I have a 16-bits bus added to SignalTap. So, what conditions should I set in the SignalTap so that it will be triggered on any value on the bus, which is different from 0x5555? ...
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
4 years ago

Hmm, never thought about doing that. I guess you should check if there is a NOT object when building an Advanced Trigger. Or you could create an advanced trigger that ORs <0x5555 and >0x5555 comparisons.

Or you could create 2 trigger conditions. The first one would be a basic AND trigger for 0x5555. In the second trigger condition column, you'd set each bit to look for "either edge" transitions so the logic analyzer would ultimately trigger any time a bit switched away from 0x5555.