Writing ignore bins for a cross coverage

Question

Hi,

I am trying to cross 4 cove points A, B, C and D.

bit [3:0] x, y;
covergroup cg @(posedge clk);
  c1: coverpoint x;
  c2: coverpoint y;
  c1Xc2: cross c1,c2;
endgroup : cg

I want the cross to ignore cross coverage bins when x>y. Can anyone help understand how to write the ignore bins.

Thanks,
Venkat

Answer 1

Solution

dave_59

Forum Moderator

11281 posts

In reply to vbabusr:

You can use the with clause:

covergroup cg @(posedge clk);
  c1: coverpoint x;
  c2: coverpoint y;
  c1Xc2: cross c1,c2 { ignore_bins ig = c1Xc2 with (c1 > c2);}
endgroup : cg

Or simpler equivalent:

covergroup cg @(posedge clk);
  xXy: cross x,y { ignore_bins ig = xXy with (x > y);}
endgroup : cg

— Dave Rich, Verification Architect, Siemens EDA