1 Interfaces - Basics

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interface score_if;
   integer if_age;
   integer if_iq;
   integer if_shoesize;
endinterface // score_if

module dut(score_if this_if,
       output integer out_score
       );
    always@(*) begin
        out_score= (this_if.if_age * 
            this_if.if_iq  * 
            this_if.if_shoesize)
      %101;  
    end
endmodule

module stimulus(score_if the_if);
   initial begin
      repeat (3) begin   
     the_if.if_age      = $urandom;
     the_if.if_iq       = $urandom;
     the_if.if_shoesize = $urandom;
     #10;    
      end
   end
endmodule

module top;
   integer dut_score;   
   score_if that_if();   
   stimulus stimulus( .the_if(that_if)   
              );   
   dut dut( .this_if(that_if),
            .out_score(dut_score)
        );       
   initial begin
      $monitor($time, " new score is: %0d", dut_score);
   end       
endmodule

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irun score_if.sv dut.sv stimulus.sv top.sv