FPGA 让LED灯按照指定的亮灭模式亮灭，亮灭模式未知，由用户随机指定

代码内容如下：

module counter_led_3(   
    Clk,
    Reset_n,
    Ctrl_n,
    Led
);
    input Clk;
    input Reset_n;
    input [7:0]Ctrl_n;
    output reg Led;
    
    reg [26:0]counter;
    parameter MCNT= 100000000;
    
    always@(posedge Clk or negedge Reset_n)
    if(!Reset_n)
        counter<=0;
    else if(counter == MCNT-1)
        counter <=0;
    else 
        counter <= counter +1'b1;
     always@(posedge Clk or negedge Reset_n)
     if(!Reset_n)
        Led <=0;
     else if(counter ==MCNT/8-1)
        Led <=Ctrl_n[0];
     else if(counter ==MCNT*2/8-1)
        Led <=Ctrl_n[1];
     else if(counter ==MCNT*3/8-1)
        Led <=Ctrl_n[2];
     else if(counter ==MCNT*4/8-1)
        Led <=Ctrl_n[3];   
     else if(counter ==MCNT*5/8-1)
        Led <=Ctrl_n[4];
     else if(counter ==MCNT*6/8-1)
        Led <=Ctrl_n[5];
     else if(counter ==MCNT*7/8-1)
        Led <=Ctrl_n[6];
     else if(counter ==MCNT*8/8-1)
        Led <=Ctrl_n[7];  
     else
        Led <=Led;                 
endmodule

仿真代码如下：

`timescale 1ns/1ns
 
module counter_led_3_tb();
    reg Clk_0;
    reg Reset_n_0;
    reg [7:0]Ctrl_n;
    wire Led_0;
    counter_led_3 counter_led_0_inst0(
        .Clk(Clk_0),
        .Reset_n(Reset_n_0),
        .Ctrl_n(Ctrl_n),
        .Led(Led_0)
    );
    initial Clk_0=1;
    always #10 Clk_0 =!Clk_0;
    defparam counter_led_3.MCNT=100000;
    initial begin
        Reset_n_0 <= 0;
        Ctrl_n =0;
        #201;
        Reset_n_0 <=1;
        #2000;
        Ctrl_n=8'b1000_0110;
        #200000000;
        $stop;
    end
endmodule