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
 */

`define default_netname none

module tt_um_topTDC (
    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,      // will go high when the design is enabled
    input  wire       clk,      // clock
    input  wire       rst_n     // reset_n - low to reset
);

  // All output pins must be assigned. If not used, assign to 0.
  //assign uo_out  = ui_in + uio_in;  // Example: ou_out is the sum of ui_in and uio_in
  //assign uio_out = 0;
  //assign uio_oe  = 0;

    topTDC U1 (.clk(clk), .stop(uio_in[7]), .reset(uio_in[6]), .tx(uio_out[1]), .eot(uio_out[0]));
    assign uio_oe = 8'b00000011;
    assign uio_out[7:2] = 6'b000000;
    assign uo_out[7:0] = 8'b00000000;

endmodule


`timescale 1ns / 1ps

module topTDC(clk, stop, reset, tx, eot);

input clk;
input stop;
input reset;

//output [7:0] dato;
output tx,eot;

//estados
reg [2:0] estado, edo_futuro;
parameter s0 = 3'b000;
parameter s1 = 3'b001;
parameter s2 = 3'b010;
parameter s3 = 3'b011;
parameter s4 = 3'b100;
parameter s5 = 3'b101;

reg stc;	//start de cuenta
reg stt; //stt para bloque transmisor
wire [7:0] aux;
reg [7:0] temp;
reg bandera;

contadorTDC contador(.start(stc), .clk(clk), .cuenta(aux));
RS232_TX transmisor(.D(temp), .reset(reset), .EOT(eot), .clk(clk), .STT(stt), .TX(tx));


//cambio de estados
always @(posedge clk)
begin
	if (reset)
		estado <= s0;
	else
		estado <= edo_futuro;
end

///
always @(*)
begin
	case (estado)
		s0:
		begin
			if (stop)
			begin
				edo_futuro = s1;
				stc = 1'b1;
				bandera = 1'b0;
				stt = 1'b0;
			end
			else
			begin
				edo_futuro = s0;
				stc = 1'b0;
				bandera = 1'b0;
				stt = 1'b0;
			end
		end
		s1:
		begin
			if (stop)
			begin
				edo_futuro = s1;
				stc = 1'b1;	//inicio cuenta
				bandera = 1'b0;
				stt = 1'b0;
			end
			else
			begin
				edo_futuro = s2;
				stc = 1'b0;
				bandera = 1'b1;	//almaceno cuenta en variable aux
				stt = 1'b0;
			end
		end
		s2:
		begin
			edo_futuro = s3;
			stc = 1'b0;		//termino cuenta
			stt = 1'b1;		//inicio transmision
			bandera = 1'b0;
		end
		s3:
		begin
			edo_futuro = s4;
			stc = 1'b0;		//termino cuenta
			bandera = 1'b0;
			stt = 1'b0;
		end
		s4:
		begin
			edo_futuro = s5;
			stt = 1'b0;		//terminimo transmision
			stc = 1'b0;		//termino cuenta
			bandera = 1'b0;
		end
		s5:
		begin
			stt = 1'b0;
						
			if (eot==1'b1)
			begin
				edo_futuro = s0;
				bandera = 1'b0;
				stc = 1'b0;		//termino cuenta				
			end
			else
			begin
				edo_futuro = s5;
				bandera = 1'b0;
				stc = 1'b0;		//termino cuenta
			end
		end
	endcase
end

always @(posedge clk)
begin
	if(bandera == 1'b1)
		temp <= aux;
	else
		temp <= temp;
end

//assign dato = temp;

endmodule


`timescale 1ns / 1ps

module contadorTDC(start, clk, cuenta);
// >>> Module Implementation Begin

// <<< Module Implementation End
endmodule




`timescale 1ns / 1ps

module RS232_TX(D, reset, clk, EOT, STT, TX);

parameter BaudRate=9600;
parameter reloj=50000000;
parameter conta=reloj/BaudRate;

input clk,reset,STT;
input [7:0] D;
output reg TX, EOT;

reg B,enable;	  				//Pulso Buad Rate emisor
reg [12:0] k;
reg [3:0] estado, nex_estado,M; 
reg [7:0] Dreg;
wire P;

always @(estado)
	begin
		if(estado == 0) begin EOT<=1'b1;	M<=4'b0000; enable<=1'b0;			end
		else if(estado == 1) begin EOT<=1'b0; M<=4'b0001; enable<=1'b1;	end
		else if(estado == 2) begin EOT<=1'b0; M<=4'b0010; enable<=1'b1;	end
		else if(estado == 3) begin EOT<=1'b0; M<=4'b0011; enable<=1'b1;	end
		else if(estado == 4) begin EOT<=1'b0; M<=4'b0100; enable<=1'b1;	end
		else if(estado == 5) begin EOT<=1'b0; M<=4'b0101; enable<=1'b1;	end
		else if(estado == 6) begin EOT<=1'b0; M<=4'b0110; enable<=1'b1;	end
		else if(estado == 7) begin EOT<=1'b0; M<=4'b0111; enable<=1'b1;	end
		else if(estado == 8) begin EOT<=1'b0; M<=4'b1000; enable<=1'b1;	end
		else if(estado == 9) begin EOT<=1'b0; M<=4'b1001; enable<=1'b1;	end
		else if(estado == 10) begin EOT<=1'b0; M<=4'b1010; enable<=1'b1;	end
		else if(estado == 11) begin EOT<=1'b0; M<=4'b0000; enable<=1'b1;	end
		else begin EOT<=1'b1; M<=4'b0000; enable<=1'b0; end
	end

always @(M,Dreg,P)
	begin
		case (M)
			4'b0000: TX<=1'b1;
			4'b0001: TX<=1'b0;
			4'b0010: TX<=Dreg[0];
			4'b0011: TX<=Dreg[1];
			4'b0100: TX<=Dreg[2];
			4'b0101: TX<=Dreg[3];
			4'b0110: TX<=Dreg[4];
			4'b0111: TX<=Dreg[5];
			4'b1000: TX<=Dreg[6];
			4'b1001: TX<=Dreg[7];
			4'b1010: TX<=P;
			default: TX<=1'b1;
		endcase
	end

always @(posedge clk) // generación de la señal Baudio
begin
	if (enable==1'b1)
   begin
		if (k>=(conta-1))
      begin
			k<=0;
         B<=1'b1;
      end
      else
		begin
			k<=k+1'b1;
         B<=1'b0;
      end
	end    
   else     
   begin
		k<=0;
      B<=0;
   end
end

assign P=~(Dreg[0]^Dreg[1]^Dreg[2]^Dreg[3]^Dreg[4]^Dreg[5]^Dreg[6]^Dreg[7]);	
		
always @(posedge clk, posedge reset)
begin
	if (reset) 
		estado<=0; 
	else 
		estado<=nex_estado;
end

always @(posedge clk, posedge reset)
begin
	if (reset)	
		Dreg<=0;
	else if (estado==1) 
		Dreg<=D;
	else 
		Dreg<=Dreg;
end

always @(estado or STT or B)
begin
	case (estado)
		0: begin
			if (STT)	nex_estado<=1;	else nex_estado<=0;
		end
		1: begin
			if (B) nex_estado<=2; else	nex_estado<=1;
		end
		2: begin
			if (B) nex_estado<=3; else	nex_estado<=2;
		end	
		3: begin
			if (B) nex_estado<=4; else	nex_estado<=3;
		end		 
		4: begin
			if (B) nex_estado<=5; else	nex_estado<=4;
		end	
		5: begin
			if (B) nex_estado<=6; else	nex_estado<=5;
		end	
		6: begin
			if (B) nex_estado<=7; else	nex_estado<=6;
		end
		7: begin
			if (B) nex_estado<=8; else	nex_estado<=7;
		end	
		8: begin
			if (B) nex_estado<=9; else	nex_estado<=8;
		end	
		9: begin
			if (B) nex_estado<=10; else nex_estado<=9;
		end	
		10: begin
			if (B) nex_estado<=11;	else	nex_estado<=10;
		end
		11: begin
			if (B) nex_estado<=0;	else	nex_estado<=11;
		end	
		default: nex_estado<=0;
	endcase
end

endmodule


Reference solution:
rtl/generated.v: 
input start;
input clk;

output reg [7:0] cuenta;

reg [7:0] q;


always @(posedge clk, negedge start)
begin
	if (start == 0)
		q <= 0;
	else
		q <= q + 1'b1;
end

always @(posedge clk)
begin
	cuenta <= q;
end