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Functional coverage

jxker

Hi, all. I am trying to do functional coverage, but it seems something wrong with my command line, that I cannot get a functional coverage result, but only the code coverage result. Can anyone tell me where I make a mistake?

my systemverilog code is:

class rand_cov;
   rand bit[4:0] data_a;
endclass

module cov;
   int i;
   int succ;
   bit[4:0] data;
  
   rand_cov cov_t;
   
   covergroup cg;
      cov_a: coverpoint data;
   endgroup
   cg cg_inst;

   initial begin
      cg_inst =new();
      cov_t = new();
     
      for(i=0; i<20; i++) begin
          succ = cov_t.randomize();
          data = cov_t.data_a;
          cg_inst.sample();
          $display("data=%0d, now coverage is: %0d",data, cg_inst.get_coverage());
      end      
   end
endmodule

And my command is :

ncvlog -message -sv cov.v
ncelab -message -access +rcw -covdut cov -coverage all work.cov:module
ncsim -message -covoverwrite -covtest cov -covscope cov work.cov:module

Parents

  •  

     Change your code as below adding:

    option.per_instance=1;

    and

        cg_inst.set_inst_name($psprintf({"%m","_cg_inst"}));

    Otherwise you'll end up with a covergroup machine generated name like: cg_inst@1_1

    class rand_cov;
       rand bit[4:0] data_a;
    endclass

    module cov;
       int i;
       int succ;
       bit[4:0] data;
      
       rand_cov cov_t;
      
       covergroup cg;
      option.per_instance = 1;
          cov_a: coverpoint data;
       endgroup
       cg cg_inst;

       initial begin
          cg_inst =new();
          cov_t = new();
          cg_inst.set_inst_name($psprintf({"%m","_cg_inst"}));
         
          for(i=0; i<20; i++) begin
              succ = cov_t.randomize();
              data = cov_t.data_a;
              cg_inst.sample();
              $display("data=%0d, now coverage is: %0d",data, cg_inst.get_coverage());
          end     
       end
    endmodule

Reply

  •  

     Change your code as below adding:

    option.per_instance=1;

    and

        cg_inst.set_inst_name($psprintf({"%m","_cg_inst"}));

    Otherwise you'll end up with a covergroup machine generated name like: cg_inst@1_1

    class rand_cov;
       rand bit[4:0] data_a;
    endclass

    module cov;
       int i;
       int succ;
       bit[4:0] data;
      
       rand_cov cov_t;
      
       covergroup cg;
      option.per_instance = 1;
          cov_a: coverpoint data;
       endgroup
       cg cg_inst;

       initial begin
          cg_inst =new();
          cov_t = new();
          cg_inst.set_inst_name($psprintf({"%m","_cg_inst"}));
         
          for(i=0; i<20; i++) begin
              succ = cov_t.randomize();
              data = cov_t.data_a;
              cg_inst.sample();
              $display("data=%0d, now coverage is: %0d",data, cg_inst.get_coverage());
          end     
       end
    endmodule

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