`timescale 1 ns/ 1 ps module blinking_led_tb (); logic clk = 1'b1, rst = 1'b1, short = 1'b0, led; always begin #5 clk = ~clk; end initial begin #20 rst = 1'b0; #1000000000 short = 1'b1; end blinking_led dut(.*); endmodule