点灯程序的 test bench　，自动生成如下代码，，
请教　// Add stimulus here
后面怎么写激励信号呢？　谢谢，，不要直接给实例而不说明呀，，最后说明加实例　呵呵，要不还是不懂
谢谢


module test;
// Inputs reg clk; reg rst; reg sw0; reg sw1; reg sw2; reg sw3;
// Outputs wire led0; wire led1; wire led2; wire led3; wire led4; wire led5; wire led6; wire led7;
// Instantiate the Unit Under Test (UUT) sw_led uut ( .clk(clk),  .rst(rst),  .sw0(sw0),  .sw1(sw1),  .sw2(sw2),  .sw3(sw3),  .led0(led0),  .led1(led1),  .led2(led2),  .led3(led3),  .led4(led4),  .led5(led5),  .led6(led6),  .led7(led7) );
initial begin // Initialize Inputs clk = 0; rst = 1; sw0 = 0; sw1 = 0; sw2 = 0; sw3 = 0;
// Wait 100 ns for global reset to finish #100;         // Add stimulus here end      endmodule



附点灯的代码
module sw_led(clk, rst, sw0, sw1, sw2, sw3, led0, led1, led2, led3, led4,                  led5, led6, led7);    input         clk;    input         rst;    input         sw0;    input   sw1;    input   sw2;    input   sw3;    output   led0;    output   led1;    output led2;    output led3;    output led4;    output led5;    output led6;    output led7;
    wire led0; wire led1; wire led2; wire led3; wire led4; wire led5; wire led6; wire led7;
wire   [3 :0] sw; reg    [7 :0] led;
assign   sw = {sw0,sw1,sw2,sw3}; assign   {led0,led1,led2,led3,led4,led5,led6,led7} = led;
always @ ( posedge clk or negedge rst) begin if(!rst) led<='b0; else case ( sw )
4'b1110:  led <= 8'b0000_0001; 4'b1101:  led <= 8'b0000_0010; 4'b1011:  led <= 8'b0000_0100; 4'b0111:  led <= 8'b0000_1000; 4'b1100:  led <= 8'b0001_0000; 4'b1001:  led <= 8'b0010_0000; 4'b0011:  led <= 8'b0100_0000; 4'b0110:  led <= 8'b1000_0000; default:  led <= 8'b0000_0000;
endcase endendmodule 此帖出自小平头技术问答