module tb;
  
  // Declare some variables that can be "sampled" in the covergroup
  bit [1:0] mode;
  bit [2:0] cfg;
  
  // Declare a clock to act as an event that can be used to sample
  // coverage points within the covergroup
  bit clk;
  always #20 clk = ~clk;
  
  // "cg" is a covergroup that is sampled at every posedge clk
  covergroup cg @ (posedge clk);
    coverpoint mode;
  endgroup
  
  // Create an instance of the covergroup
  cg  cg_inst;
  
  initial begin
    // Instantiate the covergroup object similar to a class object
    cg_inst= new();
    
    // Stimulus : Simply assign random values to the coverage variables
    // so that different values can be sampled by the covergroup object
    for (int i = 0; i < 5; i++) begin
      @(negedge clk);
      mode = $random;
      cfg  = $random;
      $display ("[%0t] mode=0x%0h cfg=0x%0h", $time, mode, cfg);
    end
  end
  
  // At the end of 500ns, terminate test and print collected coverage
  initial begin
    #500 $display ("Coverage = %0.2f %%", cg_inst.get_inst_coverage());
    $finish;
  end
endmodule



/*
Simulation Log:
---------------

ncsim> run
[40] mode=0x0 cfg=0x1
[80] mode=0x1 cfg=0x3
[120] mode=0x1 cfg=0x5
[160] mode=0x1 cfg=0x2
[200] mode=0x1 cfg=0x5
Coverage = 50.00 %
Simulation complete via $finish(1) at time 500 NS + 0
./testbench.sv:37     $finish;
ncsim> exit
*/

// Code your design here