verilog红绿灯，东西和南北各为一个寄存器

以下是一个简单的Verilog红绿灯代码，其中东西方向和南北方向各有一个寄存器控制信号，用于控制红绿灯的亮灭：

module traffic_lights(
    input clk,
    input reset,
    input east_west,
    input north_south,
    output reg red_light_ew,
    output reg yellow_light_ew,
    output reg green_light_ew,
    output reg red_light_ns,
    output reg yellow_light_ns,
    output reg green_light_ns
    );

// 定义状态机的状态
typedef enum logic [1:0] {
    EW_GREEN, EW_YELLOW, NS_RED, NS_YELLOW
} state_type;

// 定义状态机的当前状态
reg [1:0] state;

// 定义计数器，用于控制红绿灯的亮灭
reg [3:0] count;

// 初始化状态机和计数器
initial begin
    state = EW_GREEN;
    count = 0;
end

// 定义状态转移和计数器控制逻辑
always @(posedge clk) begin
    if (reset) begin
        state <= EW_GREEN;
        count <= 0;
    end else begin
        case (state)
            EW_GREEN: begin
                if (east_west) begin
                    state <= EW_YELLOW;
                    count <= 0;
                end else if (north_south) begin
                    state <= NS_RED;
                    count <= 0;
                end
            end
            EW_YELLOW: begin
                if (count == 2) begin
                    state <= NS_RED;
                    count <= 0;
                end
            end
            NS_RED: begin
                if (north_south) begin
                    state <= NS_YELLOW;
                    count <= 0;
                end else if (east_west) begin
                    state <= EW_GREEN;
                    count <= 0;
                end
            end
            NS_YELLOW: begin
                if (count == 2) begin
                    state <= EW_GREEN;
                    count <= 0;
                end
            end
        endcase
        count <= count + 1;
    end
end

// 定义红绿灯控制逻辑
always @(posedge clk) begin
    case (state)
        EW_GREEN: begin
            red_light_ew <= 0;
            yellow_light_ew <= 0;
            green_light_ew <= 1;
            red_light_ns <= 1;
            yellow_light_ns <= 0;
            green_light_ns <= 0;
        end
        EW_YELLOW: begin
            red_light_ew <= 0;
            yellow_light_ew <= 1;
            green_light_ew <= 0;
            red_light_ns <= 1;
            yellow_light_ns <= 0;
            green_light_ns <= 0;
        end
        NS_RED: begin
            red_light_ew <= 1;
            yellow_light_ew <= 0;
            green_light_ew <= 0;
            red_light_ns <= 0;
            yellow_light_ns <= 0;
            green_light_ns <= 1;
        end
        NS_YELLOW: begin
            red_light_ew <= 1;
            yellow_light_ew <= 0;
            green_light_ew <= 0;
            red_light_ns <= 0;
            yellow_light_ns <= 1;
            green_light_ns <= 0;
        end
    endcase
end

endmodule

这个代码使用状态机实现了红绿灯的控制，其中东西方向和南北方向各有一个输入信号来控制灯的亮灭。代码中包含一个计数器，用于计算红绿灯的亮灭时间。在每个状态下，根据输入信号和计数器的值来控制状态机的转移和灯的亮灭。