module traffic_light( input clk, output reg n_s_red, //南北方向三个灯 output reg n_s_yellow, output reg n_s_green, output reg e_w_red, //东西方向三个灯 output reg e_w_yellow, output reg e_w_green ); reg [2:0] state; // 定义当前的状态 parameter S_NS_RED_EW_GREEN = 3'b000; // 南北红，东西绿，3s parameter S_NS_YELLOW_EW_RED = 3'b001; //南北红，东西黄,1s parameter S_NS_GREEN_EW_RED = 3'b010; //南北绿，东西红,3s parameter S_NS_RED_EW_YELLOW = 3'b011; //南北黄，东西红,1s always @(posedge clk) begin case (state) S_NS_RED_EW_GREEN: begin n_s_red <= 1; n_s_yellow <= 0; n_s_green <= 0; e_w_red <= 0; e_w_yellow <= 1; e_w_green <= 0; #3 state <= S_NS_YELLOW_EW_RED; end S_NS_YELLOW_EW_RED: begin n_s_red <= 1; n_s_yellow <= 1; n_s_green <= 0; e_w_red <= 0; e_w_yellow <= 0; e_w_green <= 0; #1 state <= S_NS_GREEN_EW_RED; end S_NS_GREEN_EW_RED: begin n_s_red <= 0; n_s_yellow <= 0; n_s_green <= 1; e_w_red <= 1; e_w_yellow <= 0; e_w_green <= 0; #3 state <= S_NS_RED_EW_YELLOW; end S_NS_RED_EW_YELLOW: begin n_s_red <= 1; n_s_yellow <= 0; n_s_green <= 0; e_w_red <= 1; e_w_yellow <= 1; e_w_green <= 0; #1 state <= S_NS_RED_EW_GREEN; end endcase end endmodule|修改代码使其只是verilog设计代码，不涉及仿真

好的，那么为了使这段代码只是 Verilog 设计代码，不涉及仿真，需要去掉仿真模块中的部分代码，同时对模块进行一定的修改。以下是修改后的代码：

module traffic_light(
    input clk, 
    output reg n_s_red, 
    output reg n_s_yellow, 
    output reg n_s_green, 
    output reg e_w_red, 
    output reg e_w_yellow, 
    output reg e_w_green
);

    reg [2:0] state; // 定义当前的状态

    parameter S_NS_RED_EW_GREEN = 3'b000; // 南北红，东西绿，3s
    parameter S_NS_YELLOW_EW_RED = 3'b001; //南北红，东西黄,1s
    parameter S_NS_GREEN_EW_RED = 3'b010; //南北绿，东西红,3s
    parameter S_NS_RED_EW_YELLOW = 3'b011; //南北黄，东西红,1s

    always @(posedge clk) begin
        case (state)
            S_NS_RED_EW_GREEN: begin
                n_s_red <= 1; 
                n_s_yellow <= 0; 
                n_s_green <= 0; 
                e_w_red <= 0; 
                e_w_yellow <= 1; 
                e_w_green <= 0; 
                state <= S_NS_YELLOW_EW_RED; 
            end 
            S_NS_YELLOW_EW_RED: begin
                n_s_red <= 1; 
                n_s_yellow <= 1; 
                n_s_green <= 0; 
                e_w_red <= 0; 
                e_w_yellow <= 0; 
                e_w_green <= 0; 
                state <= S_NS_GREEN_EW_RED; 
            end 
            S_NS_GREEN_EW_RED: begin
                n_s_red <= 0; 
                n_s_yellow <= 0; 
                n_s_green <= 1; 
                e_w_red <= 1; 
                e_w_yellow <= 0; 
                e_w_green <= 0; 
                state <= S_NS_RED_EW_YELLOW; 
            end 
            S_NS_RED_EW_YELLOW: begin
                n_s_red <= 1; 
                n_s_yellow <= 0; 
                n_s_green <= 0; 
                e_w_red <= 1; 
                e_w_yellow <= 1; 
                e_w_green <= 0; 
                state <= S_NS_RED_EW_GREEN; 
            end 
        endcase 
    end 

endmodule

这样修改后，代码就只包含了一个 Verilog 模块，其中包含了一个状态机。这个状态机控制了交通信号灯的状态，使其按照一定的时间序列循环切换。