Quartus II综合modelsim仿真的实现____以LED灯二选一多路器为例

module led_test(a,b,key_in,led_out);

    input a;    //输入端口a
    input b;    //输入端口b
    
    input key_in;    //按键输入端口
    
    output led_out;    //led输出端口
    
    //按下  led_out==a
    assign led_out= (key_in==0)? a:b ;
    
endmodule

`timescale 1ns/1ps    //    时间单位/时间精度

module led_test_tb;

//激励信号定义，对应连接到待测试模块的输入端口
    reg signal_a;
    reg signal_b;
    reg signal_c;
    
//待检测信号定义（led_out），对应链接到输出端口
    wire led;
    
//例化待测试模块
    led_test led_test0(
    .a(signal_a),
    .b(signal_b),
    .key_in(signal_c),
    .led_out(led)
    );
    
//产生激励
    initial begin
    
        signal_a=0;
        signal_b=0;
        signal_c=0;
        #100
        
        signal_a=0;
        signal_b=0;
        signal_c=1;
        #100
        
        signal_a=0;
        signal_b=1;
        signal_c=0;
        #100
        
        signal_a=0;
        signal_b=1;
        signal_c=1;
        #100
        
        signal_a=1;
        signal_b=0;
        signal_c=0;
        #100
        
        signal_a=1;
        signal_b=0;
        signal_c=1;
        #100
        
        signal_a=1;
        signal_b=1;
        signal_c=0;
        #100
        
        signal_a=1;
        signal_b=1;
        signal_c=1;
        
        #200
        $stop;    //系统函数，停止
    
    end

endmodule