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_systolicLif (
    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




`default_nettype none

module lif (
    input wire [7:0] current,
    input wire           clk,
    input wire       reset_n,
    output reg [7:0]   state,
    output wire        spike
    );

    wire [7:0]  next_state;
    reg [7:0] threshold;

    always @(posedge clk) begin 
        if (!reset_n) begin 
            state <= 0;
            threshold <= 200;
        end else begin 
            state <= next_state;
        end 
    end 

    assign next_state = current + (spike ? 0 :(state >> 1));
    assign spike = (state >= threshold);
endmodule

module weight_stationary_Mac (
    input wire clk,
    input wire reset_n,
    input wire [6:0] x_data,
    input wire [6:0] in_weight,
    input wire [6:0] accumulate,
    output reg [6:0] out_data,
    output wire [0:0] selct_IN
);
    wire [8:0] mac_result;
    reg [6:0] weight_Reg;
    reg [8:0] mac_Reg;
    reg [0:0] enable_Reg;

    // always @(posedge clk) begin 
    //     if(reset_n) begin
    //         mac_Reg <= 15'b0;
    //     end else begin 
    //         mac_Reg <= mac_result;
    // end
    // end
    assign selct_IN = mac_result > 9'd200;


    
    // Multiply-accumulate (MAC) operation
    assign mac_result = (x_data * in_weight) + {2'b0,accumulate};

    // Store MAC result as 8-bit value (truncate or round based on application)
    always @(posedge clk) begin
        if (!reset_n | enable_Reg)
            out_data <= 7'b0;
        else
            out_data <= mac_result[7:1];  // Adjust to match desired width
    end
     always @(posedge clk) begin
        if (!reset_n)
            enable_Reg <= 1'b0;
        else
            enable_Reg <= selct_IN; 
    end
endmodule

Reference solution:
rtl/generated.v: 
  // 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 [7:0] = 0;
  assign uio_oe  = 8'b10000000;
  assign uo_out [3:0] = 0;


  // List all unused inputs to prevent warnings
  wire _unused = &{ena, 1'b0};
  //reg [6:0] mac_block_One_State;
  reg [0:0] bypass_Mac;
  wire [6:0] mac_Out_one, mac_Out_two, mac_Out_three, mac_Out_four;
  wire [6:0] lif_byp_One, lif_byp_Two, lif_byp_Three, lif_byp_Four;
  reg [0:0] lif_IN, Lif_IN_Two, Lif_IN_Three, Lif_IN_Four;
  reg [7:0]   state;
  reg [7:0] threshold;
  wire [7:0]  next_state;
  wire [0:0] spike;


  weight_stationary_Mac first(
        .clk(clk),
        .reset_n(rst_n),
        .x_data(ui_in[6:0]),
        .in_weight(7'd16),
        .accumulate(0),
        .out_data(mac_Out_one),
        .selct_IN(lif_IN)
    );
    weight_stationary_Mac second(
        .clk(clk),
        .reset_n(rst_n),
        .x_data(ui_in[6:0]),
        .in_weight(7'd16),
        .accumulate(mac_Out_one),
        .out_data(mac_Out_two),
        .selct_IN(Lif_IN_Two)
    );
    weight_stationary_Mac third(
        .clk(clk),
        .reset_n(rst_n),
        .x_data(ui_in[6:0]),
        .in_weight(7'd16),
        .accumulate(mac_Out_two),
        .out_data(mac_Out_three),
        .selct_IN(Lif_IN_Three)
    );
    weight_stationary_Mac fourth(
        .clk(clk),
        .reset_n(rst_n),
        .x_data(ui_in[6:0]),
        .in_weight(7'd16),
        .accumulate(mac_Out_three),
        .out_data(mac_Out_four),
        .selct_IN(Lif_IN_Four)
    );

    assign lif_byp_One = lif_IN ? mac_Out_one : 7'b0;
    assign lif_byp_Two  = Lif_IN_Two ? mac_Out_two : 7'b0;
    assign lif_byp_Three = Lif_IN_Three ? mac_Out_three : 7'b0;
    assign lif_byp_Four  = Lif_IN_Four ? mac_Out_four : 7'b0;

     lif one(.current({lif_byp_One,1'b0}),
        .clk(clk),
        .reset_n(rst_n),
        .state(),
        .spike(uo_out[7])
   
    );

  lif two(.current({lif_byp_Two,1'b0}),
        .clk(clk),
        .reset_n(rst_n),
        .state(),
        .spike(uo_out[6])
   
    );
     lif three(.current({lif_byp_Three,1'b0}),
        .clk(clk),
        .reset_n(rst_n),
        .state(),
        .spike(uo_out[5])
   
    );
     lif four(.current({lif_byp_Four,1'b0}),
        .clk(clk),
        .reset_n(rst_n),
        .state(),
        .spike(uo_out[4])
   
    );

// genvar i;
// generate 
// for(i = 1; i < 6'd7; i = i + 1) begin 
//     weight_stationary_Mac generated(
//         .clk(clk),
//         .reset_n(rst_n),
//         .x_data(ui_in[6:0]),
//         .in_weight(uio_in[6:0]),
//         .accumulate(accumalate_Array[i]),
//         .out_data(accumalate_Array[i+1]),
//         .selct_IN(bypass_Mac)
//     );
//     always @(*) begin
//         lif_IN[i] = bypass_Mac ? accumalate_Array[i] : 7'b0;
//     end
  
//     lif one(.current({lif_IN[i],1'b0}),
//         .clk(clk),
//         .reset_n(rst_n),
//         .state(uo_out),
//         .spike(uio_out[7])
   
//     );
    
  
// end

// endgenerate 

// genvar j;
// generate
// for (j = 0; j < 7; j = j + 1) begin
    
// end
// endgenerate

  

//   assign next_state = lif_IN[i] + (spike ? 0 :(state >> 1));
//     assign spike = (state >= threshold);
//     always @(posedge clk) begin 
//         if (!rst_n) begin 
//             state <= 0;
//             threshold <= 200;
//         end else begin 
//             state <= next_state;
//         end 
//     end