LFSR - Linear Feedback Shift Register

This repository contains a VHDL implementation of a Linear Feedback Shift Register (LFSR). LFSRs are commonly used for generating pseudo-random data in simulations, testing, and various digital designs.

The design is an abstracted version inspired by the original implementation by Deepak Kumar Tala and Alexander H. Pham, available here.

🚀 Features

• Customizable Output Width: Easily adjust the output width using the width generic parameter.
• Seed Initialization: Set the initial seed value through the seed generic parameter.
• Enable and Reset: Control the LFSR operation using enable (CE) and reset (SCLR) inputs.
• VHDL Compatible: Designed for easy integration into your VHDL projects.

📄 Usage

1. Add the Component: Integrate the LFSR entity into your VHDL project.
2. Configure the Generics:
   • Seed: Set the initial seed value (integer).
   • Width: Define the desired width of the LFSR output.
3. Connect the Ports:
   • cout: The pseudo-random output of the LFSR.
   • CE: Enable signal to control counting.
   • CLK: Clock input for synchronous operation.
   • SCLR: Reset input to clear the LFSR.
4. Simulate: Use the LFSR to generate pseudo-random data for testing or other applications.

Example Code Snippet

Here’s an example of how to instantiate the LFSR entity in your VHDL design:

library ieee;  
use ieee.std_logic_1164.all;  

entity top_level is  
end entity;  

architecture behavior of top_level is  
  signal clk   : std_logic;  
  signal reset : std_logic;  
  signal enable: std_logic;  
  signal lfsr_out: std_logic_vector(7 downto 0);  

begin  

  lfsr_inst: entity work.lfsr  
    generic map (  
      seed  => 42,    -- Initial seed value  
      width => 8      -- Output width  
    )  
    port map (  
      cout   => lfsr_out,  
      CE     => enable,  
      CLK    => clk,  
      SCLR   => reset  
    );  

end architecture;  

💡 Applications

• Test data generation for simulation environments.
• Pseudo-random sequence generation for hardware testing.
• Scrambling and simple encryption purposes.

📜 License

This code is released under the GNU General Public License v3.0. You can find the full license text here.

🤝 Credits

• Original inspiration: Deepak Kumar Tala and Alexander H. Pham (ASIC-World)