====Blink的测试文件程序====

<code verilog>
// --------------------------------------------------------------------
// >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
// --------------------------------------------------------------------
// File name      : blink_test.v
// Module name    : blink_test
// Author         : STEP 
// Description    : testbench for blink.v
// Web            : www.stepfpga.com
// 
// --------------------------------------------------------------------
// Code Revision History :
// --------------------------------------------------------------------
// Version: |Mod. Date:   |Changes Made:
// V1.0     |2015/11/11   |Initial ver
// --------------------------------------------------------------------
`timescale 1ns / 100ps
module blink_test;

parameter CLK_PERIOD = 40;  //CLK_PERIOD=40ns, Frequency=25MHz

reg       sys_clk;
reg       sys_rst_n;  //active low
wire      led_out;

initial
	sys_clk = 1'b0;
always
	sys_clk = #(CLK_PERIOD/2) ~sys_clk;


initial 
	begin
		sys_rst_n = 1'b0;
		#100;
		sys_rst_n = 1'b1;
	end

blink #(.CNT_NUM(10)) blink_uut(
                               .clk_in    (sys_clk),
                               .rst_n_in  (sys_rst_n),
                               .led_out   (led_out)
                               );
	
endmodule

</code>