EP4CE115F29C7数字秒表引脚配对代码

以下是EP4CE115F29C7数字秒表的引脚配对代码示例：

module digital_stopwatch (
  input clk,
  input rst,
  input start,
  input stop,
  input reset,
  output reg[3:0] seconds,
  output reg[3:0] minutes,
  output reg[3:0] hours,
  output reg[6:0] ms
);

reg [22:0] count;
reg [3:0] s;
reg [3:0] m;
reg [3:0] h;
reg [6:0] millisecond;
reg [1:0] state;

parameter IDLE = 2'b00;
parameter RUNNING = 2'b01;
parameter STOPPED = 2'b10;
parameter RESET = 2'b11;

always @(posedge clk, posedge rst) begin
  if (rst) begin
    count <= 0;
    s <= 0;
    m <= 0;
    h <= 0;
    millisecond <= 0;
    state <= IDLE;
  end
  else begin
    case (state)
      IDLE: begin
        count <= 0;
        s <= 0;
        m <= 0;
        h <= 0;
        millisecond <= 0;
        if (start) begin
          state <= RUNNING;
        end
      end
      RUNNING: begin
        if (stop) begin
          state <= STOPPED;
        end
        else begin
          count <= count + 1;
          millisecond <= millisecond + 1;
          if (millisecond == 100) begin
            millisecond <= 0;
            s <= s + 1;
          end
          if (s == 10) begin
            s <= 0;
            m <= m + 1;
          end
          if (m == 60) begin
            m <= 0;
            h <= h + 1;
          end
        end
      end
      STOPPED: begin
        if (start) begin
          state <= RUNNING;
        end
        if (reset) begin
          state <= RESET;
        end
      end
      RESET: begin
        count <= 0;
        s <= 0;
        m <= 0;
        h <= 0;
        millisecond <= 0;
        state <= IDLE;
      end
    endcase
  end
end

assign seconds = s;
assign minutes = m;
assign hours = h;
assign ms = millisecond;

endmodule

该代码包含时钟，复位和启动/停止/重置输入，以及输出秒，分，小时和毫秒。它使用有限状态机来控制秒表的行为。