LED

点亮LED

源文件

//	led.v
`timescale 1ns / 1ps

//	点亮LED
module led(
	input			clk		,
    input			rst_n	,	//	低电平复位
    output	reg		led		
);
    
    always @(posedge clk) begin	//	同步复位
        if(!rst_n)
            led	<=	1'b0	;
    	else
            led	<=	1'b1	;
    end

endmodule

仿真文件

//	tb.v
`timescale 1ns / 1ps

module tb();
reg		clk		;
reg		rst_n	;
wire	led		;

led led_tb(
	.clk	(clk	)	,
	.rst_n	(rst_n	)	,
	.led	(led	)	
);
	
initial begin
	clk		=	1'b0	;
	rst_n	=	1'b0	;
	#100
	rst_n	=	1'b1	;
end
always	#10	clk	=	~clk;

endmodule

仿真结果

流水灯

源文件

//	led_water
`timescale 1ns / 1ps

module led_water(
	input					clk		,
    input					rst_n	,
    output	reg		[3:0]	led		
);
    
    parameter	TIME_S	=	26'd50_000_000	;
    reg		[25:00]	cnt_s	;
    
    //1s计时
    always @(posedge clk) begin
        if(!rst_n)
            cnt_s	<=	26'd0				;
        else if(cnt_s == TIME_S - 26'd1)
            cnt_s	<=	26'd0				;
        else
            cnt_s	<=	cnt_s	+	26'd1	;
    end
    
    always @(posedge clk) begin
        if(!rst_n)
            led	<=	4'b1000				;
        else if(cnt_s == TIME_S - 26'd1)
            led	<=	{led[0], led[3:1]}	;
    end

endmodule

仿真文件

//	tb.v
//	为方便观察仿真结果，缩小源文件中TIME_S = 26'd5
`timescale 1ns / 1ps

module tb();
reg				clk		;
reg				rst_n	;
wire	[3:0]	led		;

led_water led_water_tb(
	.clk	(clk	)	,
	.rst_n	(rst_n	)	,
	.led	(led	)	
);
	
initial begin
	clk		=	1'b0	;
	rst_n	=	1'b0	;
	#100
	rst_n	=	1'b1	;
end
always	#10	clk	=	~clk;

endmodule

仿真结果

走马灯

源文件

仿真文件

仿真结果

呼吸灯

源文件

仿真文件

仿真结果