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Functional Coverage in Transaction Class

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Hi all,

When do data-oriented functional coverage, can we put the covergroup in transaction class directly? And is there any short guideline how to do?

For example,
I have transaction define class like:
//-----------
class video_pkg_c;
      rand bit [7:0]  opcode_1;
      rand bit [7:0]  opcode_2;
      rand bit [15:0] data;
      //----
      // can I add covergroup here?
      //----
endclass

class video_pkg_driver;
      ... ...
      video_pkg_c video_pkg;
      video_pkg = new();
      rand_result = video_pkg.randomize();
      ... ...
endclass
//-----------

I use IUS583.

Best regards,
Davy


Originally posted in cdnusers.org by davyzhu
Parents

  • Hi,

    Covergroups in transactions are usually not recommended. Classes in SV are often copied (cloned) when propagated through your testbench, e.g. when sending to the DUT and the scoreboard at the same time. This may result in counting each sampling event multiple times.

    The correct way is sampling the coverage using a monitor which is a singleton object. It will detect the sampling event from the signals and collect the coverage only on "real" transactions that actually made it to the DUT.

    Gabi


    Originally posted in cdnusers.org by Gabi
Reply

  • Hi,

    Covergroups in transactions are usually not recommended. Classes in SV are often copied (cloned) when propagated through your testbench, e.g. when sending to the DUT and the scoreboard at the same time. This may result in counting each sampling event multiple times.

    The correct way is sampling the coverage using a monitor which is a singleton object. It will detect the sampling event from the signals and collect the coverage only on "real" transactions that actually made it to the DUT.

    Gabi


    Originally posted in cdnusers.org by Gabi
Children
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