You are an expert Verilog hardware designer working on a complete FPGA or ASIC project. You are given the full source code of a Verilog project. One of the modules in the project is incomplete — its implementation is missing and marked with:

// >>> Module Implementation Begin

// <<< Module Implementation End

Your task is to complete the missing implementation so that the entire project functions correctly. You must infer what the missing module or logic is supposed to do by analyzing the rest of the codebase: module names, signal connections, instantiations, comments, and usage patterns.

Follow these rules:

1. Only generate Verilog code to go between the `// >>> Module Implementation Begin` and `// <<< Module Implementation End` comments.
2. Use Verilog-2001 syntax. Ensure the code is synthesizable.
3. Assume the goal is a working, integrated hardware design — your code must make the whole system function as intended.
4. Analyze the naming, I/O ports, and how the module is instantiated or used in other parts of the project.
5. Implement correct behavior based on design context. Do not guess randomly — reason it out.
6. Avoid vendor-specific features unless explicitly required.
7. Do not output comments, explanation, or anything outside the required code region unless explicitly asked.

Your output should contain **only the Verilog code** that fits inside the marked region.

 

/*
 * Copyright (c) 2024 Your Name
 * SPDX-License-Identifier: Apache-2.0
 */
/* verilator lint_off UNUSEDSIGNAL */
`default_nettype none
	/* verilator lint_off WIDTHTRUNC */
module tt_um_ender_clock (
	input  wire [7:0] ui_in,    // Dedicated inputs
    output wire [7:0] uo_out,   // Dedicated outputs
    input  wire [7:0] uio_in,   // IOs: Input path
    output wire [7:0] uio_out,  // IOs: Output path
    output wire [7:0] uio_oe,   // IOs: Enable path (active high: 0=input, 1=output)
    input  wire       ena,      // always 1 when the design is powered, so you can ignore it
    input  wire       clk,      // clock
    input  wire       rst_n     // reset_n - low to reset
);

//修改名称
wire reset;
wire clock ;
assign clock=clk;
assign reset=rst_n;
//control signel
wire [2:0]status;
parameter status_show_time=3'd0;
parameter status_show_hour=3'd1;
parameter status_show_minute=3'd2;
parameter status_show_month=3'd3;
parameter status_show_day=3'd4;
reg clock_run_flag;
reg[15:0]clock_counter;
always @(posedge clock or negedge reset)
begin
	if(!reset)
	begin
		clock_counter<=16'd0;
	end
	else
	begin
	       clock_counter<=clock_counter+16'd1;
	end
end
//second clock
wire second_flag;
wire [15:0]clock_count;
time_control #(16,0) time_control_second_flags(  .clock(clock),  .reset((reset&clock_run_flag)), .add_req(1'd1),.carry_flag(second_flag),.data_out(clock_count),.max(16'd32767) );
//second
wire second_carry;
wire [5:0]seond;
time_control #(6,0) time_control_second(  .clock(clock),  .reset((reset&clock_run_flag)), .add_req(second_flag),.carry_flag(second_carry),.data_out(seond),.max(6'd59) );
//minutes
wire [5:0]minute;
wire minute_carry;
	time_control #(6,0) time_control_minute(  .clock(clock),  .reset(reset), .add_req(second_carry||((status==status_show_minute)&&key_add_negedge)),.data_out(minute),.carry_flag(minute_carry),.max(6'd59) );
//hour
wire [4:0]hour;
wire hour_carry;
	time_control #(5,0) time_control_hour(  .clock(clock),  .reset(reset), .add_req(minute_carry||((status==status_show_hour)&&key_add_negedge)),.data_out(hour),.carry_flag(hour_carry),.max(5'd23) );
//day
wire [4:0]day;
wire[4:0]day_this_month;
wire day_carry;
	time_control #(5,1) time_control_day(  .clock(clock),  .reset(reset), .add_req(hour_carry||((status==status_show_day)&&key_add_negedge)),.data_out(day),.carry_flag(day_carry),.max(day_this_month[4:0]) );
//month
wire [3:0]month;
wire month_carry;
	time_control #(4,1) time_control_month(  .clock(clock),  .reset(reset), .add_req(day_carry||((status==status_show_month)&&key_add_negedge)),.data_out(month),.carry_flag(month_carry),.max(4'd12) );
//key
wire key_10ms_flag;
wire key_add_negedge;
wire [8:0]counter_10ms;
time_control #(9,0) time_control_10ms(  .clock(clock),  .reset(reset), .add_req(1'b1),.data_out(counter_10ms),.carry_flag(key_10ms_flag),.max(9'd327) );

key key_add(  .clock(clock),  .reset(reset), .time_flag(key_10ms_flag), .key_in(ui_in[1]), .key_out(key_add_negedge) );
wire key_mode_negedge;
key key_mode(  .clock(clock),  .reset(reset), .time_flag(key_10ms_flag), .key_in(ui_in[0]), .key_out(key_mode_negedge) );
    
	//clock_run_flag
	always @(posedge clock or negedge reset)
	begin
	   if(!reset)
	   begin
	       clock_run_flag<=1'd1;
	   end
	   else
	   begin
	       if((status!=status_show_time)&&(key_add_negedge))
	       begin
	           clock_run_flag<=1'd0;
	       end
	       if(status==status_show_time)
	       begin
	           clock_run_flag<=1'd1;
	       end
	   end
	end
day_of_month day_of_month_0(.month(month),.day_this_month(day_this_month));
	//status
	wire status_carry;
	time_control #(3,status_show_time) time_control_status(  .clock(clock),  .reset(reset), .add_req(key_mode_negedge),.data_out(status),.max(status_show_day[2:0]),.carry_flag(status_carry));



wire [3:0]segment_byte_control;
assign segment_byte_control=status==status_show_time?4'b1111:status==status_show_minute?4'b0011:status==status_show_hour?4'b1100:status==status_show_day?4'b0011:status==status_show_month?4'b1100:0;
segment_show segment_show1(.clock(clock),.reset(reset),.data_show(data_show),.segment(uo_out[6:0]),.byte_status(clock_counter[5:3]),.bytee(uio_out[3:0]),.segment_byte_control(segment_byte_control));
wire[11:0]data_show;
assign data_show=status==status_show_time?(ui_in[1]==1?{1'd0,hour,minute}:{2'd0,month,1'd0,day[4:0]}):status==status_show_minute?{6'd0,minute}:status==status_show_hour?{1'd0,hour,6'd0}:status==status_show_day?{6'd0,1'd0,day[4:0]}:status==status_show_month?{2'd0,month,6'd0}:0;
assign uio_out[7:4]=data_show[3:0];
assign uio_oe[7:0]=8'hff;
wire segment_D56;
assign segment_D56=(status==status_show_time)&&clock_counter[13]&&(ui_in[1]==1'd1);
assign uo_out[7]=segment_D56;
	
endmodule
/* verilator lint_on UNUSEDSIGNAL */


/* verilator lint_off UNUSEDSIGNAL */
module segment_show(input wire clock,input wire reset,input  wire [11:0]data_show,
input wire [2:0]byte_status,output wire [3:0]bytee,output wire [6:0]segment,input wire [3:0]segment_byte_control);

wire [5:0]data_showing;
assign data_showing=byte_status==0?data_show[5:0]:byte_status==2?data_show[5:0]:byte_status==4?data_show[11:6]:byte_status==6?data_show[11:6]:0;
wire [3:0]segment_show;
wire [6:0] segment_show_code;
	/* verilator lint_off WIDTHTRUNC  */
	wire [3:0]hundreds;
	wire [3:0]tens;
	assign hundreds= (data_showing / 10) ;
	assign tens= (data_showing % 10) ;
		/* verilator lint_on WIDTHTRUNC  */
	assign segment_show = (byte_status == 3'd0) ?tens:
                      (byte_status == 3'd2) ?hundreds:
                      (byte_status == 3'd4) ? tens  :
                      (byte_status == 3'd6) ?hundreds  : 4'd0;


segment_code segment_code_0(.number(segment_show),.code(segment_show_code));
assign segment=segment_show_code;
assign bytee=byte_status==0?4'b1110|(~segment_byte_control):byte_status==2?4'b1101|(~segment_byte_control):byte_status==4?4'b1011|(~segment_byte_control):byte_status==6?4'b0111|(~segment_byte_control):4'b1111;
endmodule
/* verilator lint_on UNUSEDSIGNAL */



//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2024/05/06 22:47:05
// Design Name: 
// Module Name: time_control
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module time_control #(parameter BUS_WIDTH = 6,VALUE_INIT   = 0)(
input  clock,input  reset,
input [BUS_WIDTH-1:0]max,
input add_req,output reg carry_flag,
output reg [BUS_WIDTH-1:0]data_out
    );

        
 reg [BUS_WIDTH-1:0]data_old;
    	always @(posedge clock or negedge reset)
	begin
		if(!reset)
		begin
			data_out<=VALUE_INIT;
			carry_flag<=1'd0;
		end
		else
		begin

						data_old<=data_out;
			if(add_req)
			begin
				//data<=data+{{BUS_WIDTH-1{1'b0}},{1'd0}};
		          data_out<=data_out+1;

				if(data_out==max)
				begin 
					data_out<=VALUE_INIT;
				end
			end
				if((data_old==max)&&(data_out==VALUE_INIT))
			     begin
			         carry_flag<=1'd1;
			     end
			     else
			     begin
			         carry_flag<=1'd0;
			     end
		  end
	end
endmodule



//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2024/05/07 19:49:56
// Design Name: 
// Module Name: segment_code
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module segment_code(
input wire  [3:0]number,output wire [6:0]code
    );
    assign code=number==0?7'h3f:number==1?7'h06:number==2?7'h5b:number==3?7'h4f:number==4?7'h66:number==5?7'h6d:number==6?7'h7d:number==7?7'h07:number==8?7'h7f:number==9?7'h6f:7'h0;
endmodule



//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2024/05/07 21:01:04
// Design Name: 
// Module Name: day_of_month
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module day_of_month(
input wire [3:0]month,
output wire[4:0] day_this_month
    );
assign day_this_month=month==1?5'd31:month==2?5'd28:month==3?5'd31:month==4?5'd30:month==5?5'd31:month==6?5'd30:month==7?5'd31:month==8?5'd31:month==9?5'd30:month==10?5'd31:month==11?5'd30:5'd31;
endmodule



//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2024/05/06 22:27:13
// Design Name: 
// Module Name: key
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////

module key(
input  clock,input  reset,input time_flag,
input key_in,output key_out
    );
// >>> Module Implementation Begin

// <<< Module Implementation End
endmodule




Reference solution:
rtl/generated.v:     
	reg [3:0]key_filter;
	always @(posedge clock or negedge reset)
	begin
	   if(reset==1'd0)
	   begin
	       key_filter<=4'b1111;
	   end
	   else
	   begin
	       if(time_flag==1)
	       begin
	           key_filter<={key_filter[2:0],key_in};
	       end
	   end
	end
	assign key_out=(time_flag==1)&&(key_filter==4'b1100);