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JohnDuq
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5 years ago
Solved

signaltap state trigger false positive

I have an issue were an internal memory block is reporting data that is shifted by 8 bytes. I'm trying to set up a SignalTap trigger to catch the discrepancy. The trigger is activating when it shou...
  • JohnDuq's avatar
    JohnDuq
    5 years ago

    I dropped this back to a simpler filter and got it to work

    Condition 1 : data = 3dcccccdh

    Condition 2: address = 403xh

    Condition 4: address = 683xh

    Trigger on Condition1 && !Condition 2 && !Condition3=4

    This won't catch a 4 byte data shift but it will catch an 8 byte or larger shift. That works for now.

    Thanks for all your help.

JohnDuq's avatar
JohnDuq
Icon for New Contributor rankNew Contributor
5 years ago

Thanks. it looks like when I had 'Storage Qualifier' set to 'state-based' and Trigger set to 'state-based' it caused the errors causing SignalTap to not be instantiated. At least I can compile again.

Now back to debugging this flaky trigger...

JohnDuq's avatar
JohnDuq
Icon for New Contributor rankNew Contributor
5 years ago

I dropped this back to a simpler filter and got it to work

Condition 1 : data = 3dcccccdh

Condition 2: address = 403xh

Condition 4: address = 683xh

Trigger on Condition1 && !Condition 2 && !Condition3=4

This won't catch a 4 byte data shift but it will catch an 8 byte or larger shift. That works for now.

Thanks for all your help.