//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。
//源代码
module counter_led_5(
clk,
reset_n,
Time,
ctrlA,
ctrlB,
led
);
input clk;
input reset_n;
input [31:0]Time;
input [7:0]ctrlA;
input [7:0]ctrlB;
output reg [1:0] led;
reg [31:0]counter;
always @(posedge clk or negedge reset_n)
if(!reset_n)
counter<=0;
else if(counter==Time-1)
counter<=0;
else
counter<=counter+1'b1;
reg [2:0] counter2;
always@(posedge clk or negedge reset_n)
if(!reset_n)
counter2<=0;
else if(counter==Time-1)
counter2<=counter2+1'b1;
else
counter2<=counter2;
always@(posedge clk or negedge reset_n)
if(!reset_n)
led<=0;
else case(counter2)
0:begin led[0]<=ctrlA[0];led[1]<=ctrlB[0];end
1:begin led[0]<=ctrlA[1];led[1]<=ctrlB[1];end
2:begin led[0]<=ctrlA[2];led[1]<=ctrlB[2];end
3:begin led[0]<=ctrlA[3];led[1]<=ctrlB[3];end
4:begin led[0]<=ctrlA[4];led[1]<=ctrlB[4];end
5:begin led[0]<=ctrlA[5];led[1]<=ctrlB[5];end
6:begin led[0]<=ctrlA[6];led[1]<=ctrlB[6];end
7:begin led[0]<=ctrlA[7];led[1]<=ctrlB[7];end
default led<=led;
endcase
endmodule
仿真源代码
`timescale 1ns/1ns
module counter_led_5_tb();
reg clk;
reg reset_n;
reg [7:0]ctrlA;
reg [7:0]ctrlB;
reg [31:0]Time;//这里面两个的，位宽容易忘记写
wire [1:0] led;
counter_led_5 counter_led_5_inst0(
.clk(clk),
.reset_n(reset_n),
.ctrlA(ctrlA),
.ctrlB(ctrlB),
.Time(Time),
.led(led)
);
initial clk=1;
always #10 clk=~clk;
initial begin
reset_n=0;
ctrlA=0;//这个容易忘记给初值，
ctrlB=0;
Time=0;//这个容易忘记给初值，
#201
reset_n=1;
ctrlA=8'b1000_0110;
ctrlB=8'b1001_0110;
Time=2500;
#2000;
$stop;
end
endmodule
标签：reset,LED,clk,器到,counter,input,led,小梅哥 From： https://www.cnblogs.com/wangwin4/p/17113345.html