用verilog写一个最大值为59分59.59秒的计时器，并用六个八段共阳极数码管显示数据

这是一个比较复杂的 Verilog 代码，涉及到时钟频率的计算和八段数码管的驱动。以下代码仅供参考，实际应用中需要根据具体硬件平台进行优化和修改：

module timer(clk, reset, out);

input clk, reset;
output [35:0] out;

reg [5:0] sec_1, sec_10, min_1, min_10;
reg [4:0] ms_1, ms_10;
reg [3:0] digit;

assign out = {sec_10, sec_1, "'", min_10, min_1, ".", ms_10, ms_1};

always @(posedge clk or posedge reset) begin
    if (reset) begin
        sec_1 <= 0;
        sec_10 <= 0;
        min_1 <= 0;
        min_10 <= 0;
        ms_1 <= 0;
        ms_10 <= 0;
        digit <= 0;
    end else if (digit == 4) begin
        digit <= 0;
        ms_1 <= ms_1 + 1;
        if (ms_1 == 10) begin
            ms_1 <= 0;
            ms_10 <= ms_10 + 1;
            if (ms_10 == 10) begin
                ms_10 <= 0;
                sec_1 <= sec_1 + 1;
                if (sec_1 == 10) begin
                    sec_1 <= 0;
                    sec_10 <= sec_10 + 1;
                    if (sec_10 == 6) begin
                        sec_10 <= 0;
                        min_1 <= min_1 + 1;
                        if (min_1 == 10) begin
                            min_1 <= 0;
                            min_10 <= min_10 + 1;
                            if (min_10 == 6) begin
                                min_10 <= 0;
                            end
                        end
                    end
                end
            end
        end
    end else begin
        digit <= digit + 1;
    end
end

reg [6:0] led;
reg [3:0] seg;
reg [1:0] an;

assign an = (digit == 0) ? 2'b11 : 2'b00;
assign led = (digit == 0) ? 7'b0000001 : (digit == 1) ? 7'b1001111 : (digit == 2) ? 7'b0010010 : (digit == 3) ? 7'b0000110 : (digit == 4) ? 7'b1001100 : 7'b0000000;

always @(posedge clk or posedge reset) begin
    if (reset) begin
        seg <= 4'b1111;
    end else begin
        case (digit)
            0: seg <= 4'b0110; // '
            1: seg <= (sec_10 == 5) ? 4'b0001 : (sec_10 == 4) ? 4'b1000 : (sec_10 == 3) ? 4'b1001 : (sec_10 == 2) ? 4'b0010 : (sec_10 == 1) ? 4'b1011 : 4'b0111;
            2: seg <= (sec_1 == 9) ? 4'b0001 : (sec_1 == 8) ? 4'b1000 : (sec_1 == 7) ? 4'b1001 : (sec_1 == 6) ? 4'b0010 : (sec_1 == 5) ? 4'b1011 : (sec_1 == 4) ? 4'b0111 : (sec_1 == 3) ? 4'b1110 : (sec_1 == 2) ? 4'b1100 : (sec_1 == 1) ? 4'b0100 : 4'b0000;
            3: seg <= (min_10 == 5) ? 4'b0001 : (min_10 == 4) ? 4'b1000 : (min_10 == 3) ? 4'b1001 : (min_10 == 2) ? 4'b0010 : (min_10 == 1) ? 4'b1011 : 4'b0111;
            4: seg <= (min_1 == 9) ? 4'b0001 : (min_1 == 8) ? 4'b1000 : (min_1 == 7) ? 4'b1001 : (min_1 == 6) ? 4'b0010 : (min_1 == 5) ? 4'b1011 : (min_1 == 4) ? 4'b0111 : (min_1 == 3) ? 4'b1110 : (min_1 == 2) ? 4'b1100 : (min_1 == 1) ? 4'b0100 : 4'b0000;
        endcase
    end
end

always @(posedge clk or posedge reset) begin
    if (reset) begin
        an <= 2'b11;
    end else begin
        an <= (an == 2'b10) ? 2'b01 : 2'b10;
    end
end

wire [6:0] led_out;
assign led_out = (an == 2'b10) ? led : seg;

wire [2:0] seg_out;
assign seg_out = (an == 2'b10) ? seg : 3'b000;

assign out = {led_out, seg_out};

endmodule

在这个代码中，我们使用了两个时钟，一个用于计时器的计时，另一个用于八段数码管的驱动。计时器的实现是通过不断累加秒、分、秒和毫秒，直到达到 59 分 59.59 秒的要求。八段数码管的驱动则是通过分别设置每个数码管的段选信号和位选信号，实现显示秒、分、秒和毫秒的功能。需要注意的是，在实际应用中，我们需要根据硬件平台和具体的八段数码管驱动方式进行修改和优化。