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
 */

`default_nettype none

module tt_um_multi_bit_puf_wrapper (
	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
);
// >>> Module Implementation Begin

// <<< Module Implementation End
endmodule




// This is a PUF design that includese 2**ADDR_BITS x OUT_BITS one_bit_pufs
// The addr is the address to read OUT_bits of the PUF bits
// For instance if ADDR_BITS = 2, OUT_BITS = 2
// The design will include 8 one_bit_pufs, 
// addr = 2'b10 will read 2 puf bits (OUT[5:4])

module puf #(
    parameter ADDR_BITS = 4,
    parameter OUT_BITS = 8
)
(
input clk,
input START, 
input [ADDR_BITS-1:0] addr,
input reset, 
output reg [OUT_BITS-1:0] OUT_reg
);

localparam TOTAL_PUFs = 2**ADDR_BITS * OUT_BITS;

wire [TOTAL_PUFs-1:0] OUT;

always @(posedge clk or posedge reset) begin
    if (reset) OUT_reg <= 0;
    else OUT_reg = OUT[addr * OUT_BITS +: OUT_BITS];
end

genvar i;
generate
    for (i = 0; i < TOTAL_PUFs; i = i + 1) begin : puf_loop
        one_bit_puf puf_inst(START, reset, OUT[i]);
    end
endgenerate


endmodule

module one_bit_puf(
     input wire START,    // PUF Start signal
     input wire reset,    // Reset signal
     output wire OUT
 );
 (* KEEP = "TRUE" *) wire Q0;
 (* KEEP = "TRUE" *) wire Q1;          // Outputs from the D-Latches
 wire P0;         // Delays through inverters
 wire P1;         // Delays through inverters
 
 Dlatch dl0(START, reset, P1, Q0);
 Dlatch dl1(START, reset, P0, Q1);

 // Inverters for path P1 and P2
 assign P0 = ~Q0;
 assign P1 = ~Q1;

 // Output: Difference between the two paths P1 and P2
 assign OUT = P1;


 endmodule


 module Dlatch(
     input enable,
     input reset,
     input D,
// (* KEEP = "TRUE" *)
  output reg Q
 );
 always @(enable or reset or D) begin
     if (reset)
         Q <= 1'b0;
     else if (enable)
         Q <= D;   // The input to latch 1 is the inverted signal P1
 end

 endmodule

Reference solution:
rtl/generated.v: 
	// Signals mapped from the wrapper input
	wire start_signal = ui_in[7];           // Map START signal to a input
	wire reset_signal = ~rst_n;        // Map reset signal (active-low) 
    
	// Instantiate puf 
	wire [7:0] puf_out; 
	puf puf_instance ( 
		.clk(clk), 
		.START(start_signal), 
		.addr(ui_in[3:0]), 
		.reset(reset_signal), 
		.OUT_reg(puf_out) 
	); 
	 
	// Assign the output of multi_bit_puf to uo_out
	assign uo_out = puf_out; 
     	// Unused output bits are assigned to 0
 	assign uio_out = 8'b0; 
	assign uio_oe  = 8'b0; 

	// List all unused inputs to prevent warnings such as:
	wire _unused = &{ui_in[6:4], ena, uio_in, 1'b0};