Verilog设计一个具有优先级的病房呼叫系统 (1)用1-5个开关模拟5个病房呼叫输入信号，1号优先级最高；2-5优先级以此降低： (2)用一个数码管显示呼叫信号的号码；没信号呼叫时显示0；有多个信号呼叫时，显示优先级最高的呼叫号(其他呼叫号用指示灯显示)； (3)凡呼叫发出5秒的呼叫声。 (4)对低优先级的呼叫进行存储，处理完高优先级的呼叫，再进行低优先级呼叫的处理。

以下是一个具有优先级的病房呼叫系统的Verilog设计，其中使用了1-5个开关模拟5个病房呼叫输入信号。

module priority_call(
  input clk,
  input [4:0] call_input,
  output reg [3:0] display_num,
  output reg [4:0] lights
);

  reg [4:0] call_queue [0:3];
  reg [3:0] current_call;
  reg [3:0] highest_priority_call;
  reg [3:0] second_highest_priority_call;
  reg [2:0] call_counter;
  reg [2:0] sound_counter;
  reg [2:0] silence_counter;
  reg [0:0] sound_on;

  always @(posedge clk) begin
    // check for new calls
    if (call_input[0] && !highest_priority_call)
      highest_priority_call <= 4'b0001;
    else if (call_input[1] && !highest_priority_call)
      highest_priority_call <= 4'b0010;
    else if (call_input[2] && !highest_priority_call)
      highest_priority_call <= 4'b0100;
    else if (call_input[3] && !highest_priority_call)
      highest_priority_call <= 4'b1000;
    else if (call_input[4]) begin
      call_queue[call_counter] <= highest_priority_call;
      call_counter <= call_counter + 1;
      highest_priority_call <= 0;
    end

    // reset call queue if highest priority call is active
    if (highest_priority_call) begin
      call_counter <= 0;
      second_highest_priority_call <= 0;
      for (int i = 0; i < 4; i = i + 1)
        call_queue[i] <= 0;
    end

    // select highest priority call if multiple calls are present
    if (call_counter > 0) begin
      if (!highest_priority_call) begin
        second_highest_priority_call <= call_queue[0];
        for (int i = 1; i < call_counter; i = i + 1) begin
          if (call_queue[i] < second_highest_priority_call)
            second_highest_priority_call <= call_queue[i];
        end
        highest_priority_call <= second_highest_priority_call;
      end
    end

    // update current call
    if (sound_on)
      current_call <= highest_priority_call;

    // display current call
    if (current_call)
      display_num <= current_call;
    else
      display_num <= 4'b0000;

    // update call lights
    if (current_call)
      lights <= {4'b0000, current_call};
    else
      lights <= {4'b0000, call_input};

    // sound alarm for 5 seconds
    if (highest_priority_call) begin
      if (sound_counter < 5000000) begin
        sound_on <= 1;
        sound_counter <= sound_counter + 1;
      end else if (silence_counter < 5000000) begin
        sound_on <= 0;
        silence_counter <= silence_counter + 1;
      end else begin
        sound_counter <= 0;
        silence_counter <= 0;
      end
    end
  end

endmodule

该程序使用一个队列来存储多个呼叫，并使用计数器来跟踪队列中的呼叫数量。在每个时钟上升沿时，该程序会检查输入信号，确定优先级最高的呼叫，并将其存储在“highest_priority_call”寄存器中。如果有多个呼叫，则程序会在队列中查找优先级次高的呼叫。一旦确定当前呼叫，程序会将其显示在数码管中，并使用指示灯显示其他呼叫。程序还使用计数器来控制警报声音的持续时间，并在警报声音停止后等待5秒钟，然后重新开始下一个呼叫。

请注意，此代码只是示例代码，可能需要根据具体的病房呼叫系统实现进行更改和调整。