1 //-----------------------------------------------------
  2 // Design Name : lfsr
  3 // File Name   : lfsr.sv
  4 // Function    : Linear feedback shift register
  5 // Coder      : Deepak Kumar Tala
  6 //-----------------------------------------------------
  7 module lfsr (
  8 output  reg  [7:0] out     ,  // Output of the counter
  9 input   wire       enable  ,  // Enable  for counter
 10 input   wire       clk     ,  // clock input
 11 input   wire       reset      // reset input
 12 );
 13 //------------Internal Variables--------
 14 wire        linear_feedback;
 15 //-------------Code Starts Here-------
 16 assign linear_feedback =  ! (out[7] ^ out[3]);
 17 
 18 always_ff @(posedge clk)
 19 if (reset) begin // active high reset
 20   out <= 8'b0 ;
 21 end else if (enable) begin
 22   out <= {out[6],out[5],
 23           out[4],out[3],
 24           out[2],out[1],
 25           out[0], linear_feedback};
 26 end 
 27 
 28 endmodule // End Of Module counter

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