LFSR-Random number generator

Hi, i'm Carlos Maffrand from Argentina, I've been working with this core. Good Work. I Make some modifications to avoid some synthesize warnings and optimize the number of gates used.

Take a look, this is the new lfsr.vhd:

library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; library work; use work.lfsr_pkg.ALL;

entity lfsr is generic (width : integer := 4); port (clk : in std_logic; set_seed : in std_logic; seed : in std_logic_vector(width-1 downto 0); rand_out : out std_logic_vector(width-1 downto 0)); end lfsr;

architecture Behavioral of lfsr is

begin

process(clk,set_seed,seed)

variable rand_temp : std_logic_vector (width-1 downto 0):=(0 => '1',others => '0'); variable temp : std_logic := '0';

begin

if(set_seed = '1') then
	rand_temp := seed;
elsif(rising_edge(clk)) then
	temp := xor_gates(rand_temp);
	rand_temp(width-1 downto 1) := rand_temp(width-2 downto 0);
	rand_temp(0) := temp;
end if;

rand_out <= rand_temp;

end process;

end Behavioral;

Cheers

Carlos