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Xcelium Functional Coverage

Sparsh Gupta

Is there a way to generate coverage reports, not in ucd or any other format. I have written basic covergroup and passed arguments[-covoverwrite -cov_cgsample -cov_debuglog -coverage u] to the xrun command, however I don't see anything in sim directory, nor do I see anything in the logs indicating the covergroups have been hit. How can I confirm that cover groups are getting hit and essentially observe the bins. In Questa sim, you essentially get them as part of the log itself.

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  • Hi Sparsh.

    I'm not sure where you got your switches from, but you should not normally need (or want) -cov_cgsample or -cov_debuglog. Just using -coverage u, should turn on dumping of functional coverage (did you also want code coverage?).

    I can't comment on Mentor's flow, but with Xcelium the normal flow is for the simulator to dump a binary file (*.ucd) at the end of the test, and you use a separate analysis tool, IMC, to analyse the coverage and generate reports (text, CSV, HTML).

    The ucd file would be dumped into ./cov_work/scope/test by default.

  • in reply to StephenH

    Understood, is there a definite way to know that my coverage bins are getting hit? If the directory isn't getting generated, does that mean my coverage bins are not getting hit. Also, if I really want a txt dump instead of the ucd file, can I get that. I don't have a license for IMC. I have a vmanager license though. I did see a ucdToXML command in batch mode. Will this work straight out of the box, or I would need  some settings to be configured?

  • in reply to Sparsh Gupta

    Not sure why you think you don't have a licence for IMC, it should be enabled by the same token as the simulator GUI. vManager is a superset of IMC and can generate reports as well.

    The simulator doesn't dump coverage reports in text format because text is a terrible format for regressions, you can't merge 1000's of text files and they are really inefficient compared to the binary compressed ucd format.

    The simulation should dump the cov_work directory regardless of whether you hit any coverage bins. If you have enabled ONLY functional coverage (no code coverage) then maybe you forgot to call the constructor for your covergroups, meaning that the coverage model is empty.

  • in reply to StephenH

    There is some installation related issue with IMC, which I need to take care of. Meanwhile, would it be possible to generate the reports without the use of IMC. 

    I made a mistake while coding that's why the cov_work directory was not getting generated. I rectified it now and am able to see the same. But since the report is in ucd format and I don't have IMC access for now, I can't observe the numbers so to speak. Is there a way to debug the coverage numbers using the ucd file and the waves? When I open the waves in indago, I don't see the coverpoints in the objects in the environment. 

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  • in reply to StephenH

    There is some installation related issue with IMC, which I need to take care of. Meanwhile, would it be possible to generate the reports without the use of IMC. 

    I made a mistake while coding that's why the cov_work directory was not getting generated. I rectified it now and am able to see the same. But since the report is in ucd format and I don't have IMC access for now, I can't observe the numbers so to speak. Is there a way to debug the coverage numbers using the ucd file and the waves? When I open the waves in indago, I don't see the coverpoints in the objects in the environment. 

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