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CROSS Coverage

Coverage 536
cross bins 5 cross coverage 17 binsof() 3 #coverage 51
Himanshu m soni
Himanshu m soni
Full Access
8 posts
February 25, 2022 at 2:32 am

int var;
int var_a,var_b,var_c;
 
 
 
coverpoint a : var_a
{
bins a_1 = {0};
bins a_2 = {1};
}
 
coverpoint b : var_b
{
bins b_1 = {0};
bins b_2 = {1};
}
 
coverpoint c : var_c
{
bins c_1 = {0};
bins c_2 = {1};
}
cross_all_cfg : cross a, cross b, cross c
{
ignore_bins invalid = binsof (a) iff (var =0);
}

Result : if i am doing it like this it shows only invalid bin in covergroup and not showing other bits of b and c in gui.
MY_EXPECTATION : i was expecting it will cross all bins a, b ,c only if (var=0) it will ignore bin of a

Replies

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dave_59
dave_59
Forum Moderator
10650 posts
February 25, 2022 at 10:33 am

In reply to Himanshu m soni:

Lots of syntax errors in your code, but perhaps this is what you are looking for:

  int wvar;
  int var_a,var_b,var_c;
 
  covergroup cg;
    a : coverpoint var_a
    {
      bins a_1 = {0};
      bins a_2 = {1};
    }
    b : coverpoint var_b
    {
      bins b_1 = {0};
      bins b_2 = {1};
    }
    c : coverpoint var_c
    {
      bins c_1 = {0};
      bins c_2 = {1};
    }
     all_cfg: cross a, b, c
    {
      ignore_bins invalid = binsof (a) with (wvar==0);
     }
  endgroup

The iff keyword only disables sampling of existing bins, it does not eliminate them.

— Dave Rich, Verification Architect, Siemens EDA

Himanshu m soni
Himanshu m soni
Full Access
8 posts
February 26, 2022 at 2:55 am

In reply to dave_59:

Thanks Dave,
I am grtting this error while using following piece of code
all_cfg: cross a, b, c
{
ignore_bins invalid = binsof (a) with (wvar==0);
}
The 'with' clause specified on the cross bin does not have any impact and is
invalid; it should contain at least one occurence of the constituent
coverpoint names.
Please remove or correct the clause and compile

Could you please help me in that ?

dave_59
dave_59
Forum Moderator
10650 posts
February 26, 2022 at 7:21 am

In reply to Himanshu m soni:

There is no such restriction in the LRM. I did have to make one small change to get it to compile on 3 out of 4 simulators on EDAPlayground. That was to make the variable used in the with clause an argument to the covergroup.

 int wvar;
  int var_a,var_b,var_c;
 
  covergroup cg(int v;
    a : coverpoint var_a
    {
      bins a_1 = {0};
      bins a_2 = {1};
    }
    b : coverpoint var_b
    {
      bins b_1 = {0};
      bins b_2 = {1};
    }
    c : coverpoint var_c
    {
      bins c_1 = {0};
      bins c_2 = {1};
    }
     all_cfg: cross a, b, c
    {
      ignore_bins invalid = binsof (a) with (v==0);
     }
  endgroup

— Dave Rich, Verification Architect, Siemens EDA

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