用Verilog写一个电子秒表，包含顶层模块，时钟模块，按键消抖模块，计数模块，译码显示模块

好的，我可以为您提供一个基本的Verilog代码框架，实现一个简单的电子秒表，包括顶层模块、时钟模块、按键消抖模块、计数模块和译码显示模块。请注意，这只是一个示例代码，您需要根据具体需求进行修改和优化。

// 顶层模块
module stopwatch(clk, reset, start_stop, display);
    input clk, reset, start_stop;
    output [6:0] display;
    wire [6:0] count;

    // 实例化子模块
    clock clock_inst(clk, reset);
    debounce debounce_inst(start_stop, clk, reset);
    counter counter_inst(clk, reset, debounce_inst.output);
    decoder decoder_inst(count, display);

    // 连接子模块
    assign count = counter_inst.count;
endmodule

// 时钟模块
module clock(clk, reset);
    input clk, reset;
    reg [31:0] count;

    always @(posedge clk or posedge reset) begin
        if (reset) begin
            count <= 0;
        end else begin
            count <= count + 1;
        end
    end
endmodule

// 按键消抖模块
module debounce(input start_stop, input clk, input reset, output reg output);
    reg [1:0] state;
    reg [1:0] next_state;

    parameter IDLE = 2'b00;
    parameter PRESS = 2'b01;
    parameter RELEASE = 2'b10;

    parameter DEBOUNCE_TIME = 10; // 消抖时间，单位为时钟周期

    always @(posedge clk or posedge reset) begin
        if (reset) begin
            state <= IDLE;
            output <= 1'b0;
        end else begin
            state <= next_state;
        end
    end

    always @* begin
        next_state = state;
        case(state)
            IDLE: begin
                if (start_stop == 1'b0) begin
                    next_state = PRESS;
                end
            end
            PRESS: begin
                if (start_stop == 1'b0) begin
                    next_state = RELEASE;
                end else begin
                    next_state = IDLE;
                end
            end
            RELEASE: begin
                if (start_stop == 1'b0) begin
                    next_state = PRESS;
                    output <= 1'b1;
                    #DEBOUNCE_TIME output <= 1'b0;
                end else begin
                    next_state = IDLE;
                end
            end
        endcase
    end
endmodule

// 计数模块
module counter(input clk, input reset, input start_stop, output reg [6:0] count);
    reg [31:0] count_reg;
    reg [1:0] state;
    reg [1:0] next_state;

    parameter IDLE = 2'b00;
    parameter COUNTING = 2'b01;
    parameter STOPPED = 2'b10;

    always @(posedge clk or posedge reset) begin
        if (reset) begin
            count_reg <= 0;
            state <= IDLE;
        end else begin
            state <= next_state;
            case(state)
                IDLE: begin
                    if (start_stop == 1'b1) begin
                        next_state = COUNTING;
                    end
                end
                COUNTING: begin
                    if (start_stop == 1'b0) begin
                        next_state = STOPPED;
                    end else begin
                        count_reg <= count_reg + 1;
                        next_state = COUNTING;
                    end
                end
                STOPPED: begin
                    if (start_stop == 1'b1) begin
                        next_state = COUNTING;
                    end else begin
                        next_state = STOPPED;
                    end
                end
            endcase
        end
    end

    assign count = count_reg[6:0];
endmodule

// 译码显示模块
module decoder(input [6:0] count, output reg [6:0] display);
    always @* begin
        case(count)
            7'h00: display = 7'b1111110;
            7'h01: display = 7'b0110000;
            7'h02: display = 7'b1101101;
            7'h03: display = 7'b1111001;
            7'h04: display = 7'b0110011;
            7'h05: display = 7'b1011011;
            7'h06: display = 7'b1011111;
            7'h07: display = 7'b1110000;
            7'h08: display = 7'b1111111;
            7'h09: display = 7'b1111011;
            default: display = 7'b0000000;
        endcase
    end
endmodule

这个代码框架包含了顶层模块、时钟模块、按键消抖模块、计数模块和译码显示模块。您需要使用模拟器进行仿真，并根据需要进行修改和优化。