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ICCR union usage

jzingman

We are trying to use union to get an estimate of coverage in our tests.  However, we've run into the problem that the design must be identical over all of the tests.  Our test bench uses `DEFINEs fairly extensively, and apparently this prevents us from merging the coverage databases.  Is there any way around this problem? For instance, if we use deselect_coverage on the test bench, will that allow us to use union?

 Thanks

  • Hi,

    The union command requires that the design is identical.  I think what you would like to accomplish can be done with the merge command.  The merge command will merge what is identical in primary and secondary databases, and ignore items in the secondary database that's not in the primary database.  There is also a union merge, which will create a merged database with all components of primary and secondary databases.  This is only available in IUS8..2, and I recommend using IUS8.2-s015 if you are planning to do a union merge.

     To do a union merge

     set_merge -union

    merge test1 test2 -output merged

     If you need more details, feel free to contact me at nlin@cadence.com.

     In the future, if you have any questions about the usage of the tool, be sure to file a Service Request via Cadence Online Support (http://support.cadence.com)

     Regards,

    Nancy 

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