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_anislam (
    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
);


    wire spike1, spike2;
    reg [7:0] state1, state2;


    // All output pins must be assigned. Assign unused uio_out bits to 0.
    assign uio_out[7:0] = 0;
    assign uio_oe = 8'h00;  // Set all bits to 0 for input enable
   
    // List all unused inputs to prevent warnings
    //wire _unused = &{ena, uio_out, 1'b0};
    wire _unused = &{ena, 1'b0};


    // Instantiate the first lif neuron module
    lif lif1 (
        .current(ui_in),          // Use ui_in as input current for the first neuron
        .weight(uio_in),          // Use uio_in as input weight for the first neuron
        .clk(clk),
        .reset_n(rst_n),
        .spike(spike1),
        .state(state1)
    );


    // Instantiate the second lif neuron module, driven by spike from lif1
    lif lif2 (
        .current({spike1, state1[7:1]}), // Use spike1 and state1 (how close to spiking) to drive current input of lif2
        .weight(8'd128),          // Use a fixed weight in the middle of the range 0-255, no other inputs available to drive this in the chip
        .clk(clk),
        .reset_n(rst_n),
        .spike(spike2),
        .state(state2)
    );


    // Assign the state of the last neuron to `uo_out` and spike to `uio_out[7]`
    assign uo_out = {spike2, spike1 , state2[7:2]}; //concatinating the most recent spike with the previous spike and how close the second neuron is to spiking
    //assign uio_out[7:0] = 8'b0;


endmodule



`default_nettype none


module lif (
    input wire [7:0]    current,   // Input current
    input wire [7:0]    weight,    // Weight input
    input wire          clk,
    input wire          reset_n,
    output wire         spike,     // Spike output
    output reg [7:0]    state      // State of neuron
);
// >>> Module Implementation Begin

// <<< Module Implementation End
endmodule





Reference solution:
rtl/generated.v: 

    wire [7:0] weighted_input;
    wire [7:0] next_state;
    reg [7:0] threshold = 8'd200;  // Threshold for spiking
    reg [7:0] bias = 8'd200;       // Fixed bias value


    // Weighted input calculation
    assign weighted_input = current * weight;


    // Next state calculation with bias and "leaky" integration
    assign next_state = weighted_input + bias + (state >> 1);


    // State and spike update on clock edge
    always @(posedge clk or negedge reset_n) begin
        if (!reset_n) begin
            state <= 0;
        end else if (state >= threshold) begin
            state <= 0;  // Reset state on spiking threshold
        end else begin
            state <= next_state;
        end
    end


    // Spike output when state exceeds threshold
    assign spike = (state >= threshold);