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amildm's avatar
amildm
Icon for Contributor rankContributor
3 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?
Thank you!

4 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor

    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.

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  • I'm testing the solution, will provide my feedback a bit later.