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IFV connectivity Check failure debug

rajuchavan1

Hi, 

I am new to IFV and need your assistance in debugging one of the assertion failure.

Scenario : 

assertion -add -interactive { (<path1>:top_scanb == 0) |-> ((<path2>:out_clk) === (<path3>:in_clk)) } -name test

When the above assertion is RUN, we get Trigger - Pass, Status - Fail (5).

FormalVerifier> debug :test  //opens up Waveform and we observe that top_scanb is 'x'.  

Q1: What is that the tool is checking by making top_scanb = 'x'?

Formal Verifier> assertion -show :test -verbose -list // shows that there are around 85 signals that are uninitialized.

Q2: How to debug this further?

Thanks,

Rajratna

Parents

  • As  Stephen said, you may need to file a ticket with Cadence Customer Support as debugging a problem in these forums can be difficult.

    What version of the software are you using? Try adding the "define word_level_reduction off" command to your TCL script before the prove command. It has resolved several problems with counter-examples recently in certain versions of the tool.

    Tom

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  • As  Stephen said, you may need to file a ticket with Cadence Customer Support as debugging a problem in these forums can be difficult.

    What version of the software are you using? Try adding the "define word_level_reduction off" command to your TCL script before the prove command. It has resolved several problems with counter-examples recently in certain versions of the tool.

    Tom

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