Parametric bin assignment?

Coverage
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2

In reply to Morteza_Seyedi:

For a fixed size coverpoint, you would use a wildcard bin expression

  coverpoint arr {
    // assigning a bin to each array element
        wildcard bins element_0 =  {10'b?????????1};
        wildcard bins element_1 =  {10'b????????1?};
        wildcard bins element_2 =  {10'b???????1??};
        wildcard bins element_3 =  {10'b??????1???};
        wildcard bins element_4 =  {10'b?????1????};
        wildcard bins element_5 =  {10'b????1?????};
        wildcard bins element_6 =  {10'b???1??????};
        wildcard bins element_7 =  {10'b??1???????};
        wildcard bins element_8 =  {10'b?1????????};
        wildcard bins element_9 =  {10'b1?????????};
  }
}

It would be difficult to parameterize a coverpoint for this. But what you can do is create an array of covergroups one for each bit of the array you want to cover. (untested)

covergroup cg_element (string name) with function sample(bit scalar);
  option.per_instance = 1;
  option.name = name;
  coverpoint scalar {
    bins is_set = {1};
  }
endgroup

Then you can wrap this in a parameterized class

class cover_vector#(int N);
   cg_element cg_array[N];
  function new;
     foreach(cg_array[i]) cg_array = new($sformatf("value[%0d]",i);
  endfunction
  function void sample(bit[N-1:0] value);
    foreach(cg_array[i]) cg_array.sample(value[i]);
  endfunction
endclass