System Verilog: Coverage

1. Where do you put your cover group in your code? How do you instantiate it?

Answer:
example

class driver;
stimulus sti;
Scoreboard sb;

covergroup cov;
Feature_1: coverpoint sb.store ;
Feature_2 : coverpoint sb.store { bins trans = ( 15 => 0) ;}
endgroup

virtual intf_cnt intf;

function new(virtual intf_cnt intf,scoreboard sb);
this.intf = intf;
this.sb = sb;
cov = new();
endfunction

task reset(); // Reset method
intf.data = 0;
@ (negedge intf.clk);
intf.reset = 1;
@ (negedge intf.clk);
intf.reset = 0;
@ (negedge intf.clk);
intf.reset = 1;
endtask

task drive(input integer iteration);
repeat(iteration)
begin
sti = new();
@ (negedge intf.clk);
if(sti.randomize()) // Generate stimulus
intf.data = sti.value; // Drive to DUT
sb.store = sb.store + sti.value;// Cal exp value and store in Scoreboard
if(sti.value)
cov.sample();
end
endtask
endclass