用Verilog实现多功能数字时钟的程序

好的，实现多功能数字时钟的Verilog程序如下所示：

module Clock(
    input clk, //时钟信号输入
    input rst, //复位信号输入
    output reg [3:0] hour, //小时输出
    output reg [3:0] minute, //分钟输出
    output reg [3:0] second //秒钟输出
);

reg [3:0] hour_reg; //小时寄存器
reg [3:0] minute_reg; //分钟寄存器
reg [3:0] second_reg; //秒钟寄存器
reg [2:0] state; //状态寄存器，用于实现多种功能

//时钟频率为1Hz
parameter CLK_FREQ = 1000000;
parameter COUNT_MAX = 1000000/CLK_FREQ - 1;

//时钟计数器
reg [19:0] count;

//时钟分频器
always @(posedge clk or posedge rst) begin
    if (rst) begin
        count <= 0;
    end else begin
        if (count == COUNT_MAX) begin
            count <= 0;
        end else begin
            count <= count + 1;
        end
    end
end

//状态机
always @(posedge clk or posedge rst) begin
    if (rst) begin
        state <= 0;
    end else begin
        case (state)
            0: begin //显示时间
                if (count == COUNT_MAX) begin
                    if (second_reg == 9) begin
                        second_reg <= 0;
                        if (minute_reg == 9) begin
                            minute_reg <= 0;
                            if (hour_reg == 9) begin
                                hour_reg <= 0;
                            end else begin
                                hour_reg <= hour_reg + 1;
                            end
                        end else begin
                            minute_reg <= minute_reg + 1;
                        end
                    end else begin
                        second_reg <= second_reg + 1;
                    end
                end
            end
            1: begin //设置小时
                if (count == COUNT_MAX) begin
                    if (hour_reg == 9) begin
                        hour_reg <= 0;
                    end else begin
                        hour_reg <= hour_reg + 1;
                    end
                end
            end
            2: begin //设置分钟
                if (count == COUNT_MAX) begin
                    if (minute_reg == 9) begin
                        minute_reg <= 0;
                    end else begin
                        minute_reg <= minute_reg + 1;
                    end
                end
            end
            3: begin //设置秒钟
                if (count == COUNT_MAX) begin
                    if (second_reg == 9) begin
                        second_reg <= 0;
                    end else begin
                        second_reg <= second_reg + 1;
                    end
                end
            end
        endcase
    end
end

//状态转换
always @(posedge clk or posedge rst) begin
    if (rst) begin
        hour_reg <= 0;
        minute_reg <= 0;
        second_reg <= 0;
    end else begin
        case (state)
            0: begin //显示时间
                if (count == COUNT_MAX) begin
                    state <= 0;
                end else if (rst) begin
                    state <= 0;
                end else if (hour == 8 && minute == 5) begin
                    state <= 1;
                end
            end
            1: begin //设置小时
                if (count == COUNT_MAX) begin
                    state <= 1;
                end else if (rst) begin
                    state <= 0;
                end else if (hour == 8 && minute == 5) begin
                    state <= 2;
                end
            end
            2: begin //设置分钟
                if (count == COUNT_MAX) begin
                    state <= 2;
                end else if (rst) begin
                    state <= 0;
                end else if (hour == 8 && minute == 5) begin
                    state <= 3;
                end
            end
            3: begin //设置秒钟
                if (count == COUNT_MAX) begin
                    state <= 3;
                end else if (rst) begin
                    state <= 0;
                end else if (hour == 8 && minute == 5) begin
                    state <= 0;
                end
            end
        endcase
    end
end

//输出
assign hour = hour_reg;
assign minute = minute_reg;
assign second = second_reg;

endmodule

这段Verilog程序实现了一个简单的多功能数字时钟，包括时钟的计数器和分频器，状态机和状态转换，以及小时、分钟和秒钟的输出。可以根据实际需要进行修改和完善。