1 //让多个LED灯按照设置的模式，各自在一个变化值循环独立亮灭。
2 //源代码
3 module counter_led_5(
4 clk,
5 reset_n,
6 Time,
7 ctrlA,
8 ctrlB,
9 led
10 );
11 input clk;
12 input reset_n;
13 input [31:0]Time;
14 input [7:0]ctrlA;
15 input [7:0]ctrlB;
16 output reg [1:0] led;
17 reg [31:0]counter;
18 always @(posedge clk or negedge reset_n)
19 if(!reset_n)
20 counter<=0;
21 else if(counter==Time-1)
22 counter<=0;
23 else
24 counter<=counter+1'b1;
25 reg [2:0] counter2;
26 always@(posedge clk or negedge reset_n)
27 if(!reset_n)
28 counter2<=0;
29 else if(counter==Time-1)
30 counter2<=counter2+1'b1;
31 else
32 counter2<=counter2;
33 always@(posedge clk or negedge reset_n)
34 if(!reset_n)
35 led<=0;
36 else case(counter2)
37 0:begin led[0]<=ctrlA[0];led[1]<=ctrlB[0];end
38 1:begin led[0]<=ctrlA[1];led[1]<=ctrlB[1];end
39 2:begin led[0]<=ctrlA[2];led[1]<=ctrlB[2];end
40 3:begin led[0]<=ctrlA[3];led[1]<=ctrlB[3];end
41 4:begin led[0]<=ctrlA[4];led[1]<=ctrlB[4];end
42 5:begin led[0]<=ctrlA[5];led[1]<=ctrlB[5];end
43 6:begin led[0]<=ctrlA[6];led[1]<=ctrlB[6];end
44 7:begin led[0]<=ctrlA[7];led[1]<=ctrlB[7];end
45 default：led<=led;
46 endcase
47
48 endmodule
49 仿真源代码
50 `timescale 1ns/1ns
51 module counter_led_5_tb();
52 reg clk;
53 reg reset_n;
54 reg [7:0]ctrlA;
55 reg [7:0]ctrlB;
56 reg [31:0]Time;//这里面两个的，位宽容易忘记写
57 wire [1:0] led;
58 counter_led_5 counter_led_5_inst0(
59 .clk(clk),
60 .reset_n(reset_n),
61 .ctrlA(ctrlA),
62 .ctrlB(ctrlB),
63 .Time(Time),
64 .led(led)
65 );
66 initial clk=1;
67 always #10 clk=~clk;
68
69 initial begin
70 reset_n=0;
71 ctrlA=0;//这个容易忘记给初值，
72 ctrlB=0;
73 Time=0;//这个容易忘记给初值，
74
75 #201;
76 reset_n=1;
77 ctrlA=8'b1000_0110;
78 ctrlB=8'b1001_0110;
79 Time=2500;//方便看波形
80 #2000;
81
82 $stop;
83 end
84 endmodule
85
