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coverage option weight

Umar Farooq

Hi ,

 

Can anybody explain me how "option.weight" used..

if option.weight = 50 what happens and how it is going to effect the total coverage.

if option.weight = 0 what happen and how it is going to effect the total coverage.

 

  • Hi, Umar!

     

    option.weight let's you define the influence of a covergroup/coverpoint/cross to the total coverage number of the above syntactic level.

     

    E.g:

     covergroup cg;

      aa: coverpoint a {

    option.weight = 3; 

    } 

    bb: coverpoint b; //default weight is 1

    endgroup 

    So if coverpoint aa is at 100% and coverpoint bb is at 0%, the total coverage of the covergroup cg will be 75%.

    If the weight of coverpoint aa would be the default value 1, the total coverage of the covergroup cg would be 50%.

    Imagine the weight as defining multiple coverage points for a. Like bellow:

       covergroup cg;

      aa_1: coverpoint a;

      aa_2: coverpoint a;

      aa_3: coverpoint a; 

    bb: coverpoint b; //default weight is 1

    endgroup 

     

    And if you mention option.weight = 0, that coverpoint does not contribute to the total coverage of the covegroup. It's like that coverpoint does not exist inside the covergroup (even though you can still see the coverage value of that item). 

     

    Best regards,

    Aurelian 

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