`timescale 100ps / 10ps

//stimulus file for edge triggered D type

module dff_stim;
   reg ck, d;

   dff dff1 ( q, d, ck );

   always
      begin
         ck = 0; #250 ck = 1; #500 ck = 0; #250 ck = 0;
      end
   initial
      begin
         d = 0;
         #1500
         d = 1;
         #500
         d = 0;
         #1000
         d = 1;
         #1500
         d = 0;
         #500
         d = 1;
         #1000
         d = 0;
         #2000
         d = 1;
         #1000
         $stop;
         $finish;
      end
   initial
      $gr_waves( "Clock", ck, "D", d, "Q", q  );
   //VSIM COMMAND: add wave -label "Clock" ck -label "D" d -label "Q" q
   //VSIM COMMAND: run -all
endmodule