`timescale 1ns/1ps
`default_nettype none

module blink_tb ();

reg clk = 0;

initial forever #5 clk = !clk;

wire led;


blink #(.CLK_SPEED(20)) bl (.clk(clk),.led(led));


initial begin
`ifdef VCD_DUMP
  $dumpfile("blink_tb.vcd");
  $dumpvars(0,blink_tb);
`endif
end 


initial begin
`ifdef END_TIME
    #`END_TIME $finish();
`else
    #1000 $finish();
`endif
end

initial begin

    #500 $finish();   
end

endmodule