Range Over Iterators in Verilog

module List #(parameter WIDTH = 32) (
    input wire clk,
    input wire rst,
    input wire [WIDTH-1:0] data_in,
    input wire push,
    output wire [WIDTH-1:0] data_out,
    output wire valid
);

    // Define the element structure
    reg [WIDTH-1:0] memory [0:15];  // Assuming a maximum of 16 elements
    reg [3:0] head, tail;
    reg empty;

    // Push operation
    always @(posedge clk or posedge rst) begin
        if (rst) begin
            head <= 0;
            tail <= 0;
            empty <= 1;
        end else if (push) begin
            if (empty) begin
                memory[head] <= data_in;
                empty <= 0;
            end else begin
                tail <= tail + 1;
                memory[tail] <= data_in;
            end
        end
    end

    // Output logic
    assign data_out = memory[head];
    assign valid = !empty;

endmodule

// Fibonacci generator module
module FibGenerator (
    input wire clk,
    input wire rst,
    output reg [31:0] fib_out,
    output reg valid
);

    reg [31:0] a, b;

    always @(posedge clk or posedge rst) begin
        if (rst) begin
            a <= 1;
            b <= 1;
            fib_out <= 1;
            valid <= 1;
        end else begin
            fib_out <= a;
            a <= b;
            b <= a + b;
        end
    end

endmodule

// Top module to demonstrate usage
module TopModule (
    input wire clk,
    input wire rst
);

    wire [31:0] list_data_out, fib_out;
    wire list_valid, fib_valid;

    // Instantiate List module
    List #(.WIDTH(32)) my_list (
        .clk(clk),
        .rst(rst),
        .data_in(32'd10),  // Example: pushing 10
        .push(1'b1),
        .data_out(list_data_out),
        .valid(list_valid)
    );

    // Instantiate FibGenerator module
    FibGenerator fib_gen (
        .clk(clk),
        .rst(rst),
        .fib_out(fib_out),
        .valid(fib_valid)
    );

    // Example: print values (simulation only)
    always @(posedge clk) begin
        if (list_valid)
            $display("List element: %d", list_data_out);
        if (fib_valid && fib_out < 10)
            $display("Fibonacci number: %d", fib_out);
    end

endmodule

This Verilog code provides a basic implementation of the concepts presented in the original example. Here’s an explanation of the key parts:

The List module implements a simple circular buffer to represent a list. It supports a push operation and outputs the head element.
The FibGenerator module generates Fibonacci numbers sequentially on each clock cycle.
The TopModule demonstrates how to use these modules, similar to the main function in the original example.

In Verilog, we don’t have the concept of iterators as in high-level languages. Instead, we model the behavior using sequential logic and state machines. The List module allows pushing elements, and the FibGenerator produces numbers on each clock cycle.

To use this in a real hardware design, you would need to add more control logic, such as enabling/disabling the Fibonacci generator and controlling when to push to the list.

Note that printing in Verilog ($display) is only for simulation purposes. In actual hardware, you would need to design additional modules to output or process these values as required by your specific application.

This translation maintains the spirit of the original example while adapting it to the hardware description language paradigm of Verilog.

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Range Over Iterators in Verilog