Coverage for any one of the bits in a register

Coverage
2

In reply to systemvl27:

What you can do is create an array of 128 covergroups and merger the coverage together as a type

covergroup toggle_cg with function sample(bit eachbit); 
  option.per_instance = 0;
  type_option.merge_instances = 1;
  coverpoint eachbit {
  bins toggle = ( 1 => 0 => 1 };
  }
endgroup
 
toggle_cg t_cg[128]
bit [127:0] myvector;

foreach(t_cg[ii]) t_cg[ii] = new();
...
foreach(t_cg[ii]) t_cg[ii].sample(myvector[ii]);