SystemVerilog Coverage: Create a bin for each element of an enum

Question

Say I have a enum which contains a list of valid commands or opcodes. Is there a way to create a bin for each element of the enum?

class command_coverage;
  enum {SEQ_WRITE_16_BIT = 32'hBEEFFOOD, SEQ_READ_16_BIT = 32'hFACEFACE, 
        ... } my_valid_commands

  covergroup cg();
    command_cp : coverpoint cmd {
                   bins valid_commands[] = each element of enum;
                 }
  endgroup

  ...

endclass

I tried something like:

bins valid_commands[] = my_valid_commands;

or

bins valid_commands[] = {[0:$] inside my_valid_commands};

But it didn't work as I wanted.

Matthew Taylor Matthew Taylor · Accepted Answer · 2018-11-21T11:58:20

It can be done:

command_cp : coverpoint my_valid_commands {
    bins valid_commands[] = {[my_valid_commands.first:my_valid_commands.last]};

first and last are methods of the enum, which return the first and last values respectively. These are then used as part of a range.

Here's the display from Mentor Questa (other simulators are available - I have Questa installed on my PC):

Here's an MCVE:

https://www.edaplayground.com/x/5rUu

module enum_cg;

  enum {SEQ_WRITE_16_BIT, SEQ_READ_16_BIT} my_valid_commands;

  covergroup cg();
    command_cp : coverpoint my_valid_commands {
      bins valid_commands[] = {[my_valid_commands.first:my_valid_commands.last]};
                 }
  endgroup

  cg cg0 = new;

  initial begin
    my_valid_commands = SEQ_WRITE_16_BIT;
    cg0.sample;
  end    

endmodule

SystemVerilog Coverage: Create a bin for each element of an enum

1 Answers