Subversion Repositories cryptography

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library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity carrylook_ahead2 is

port(a1,b1 : in std_logic_vector(15 downto 0);

      s1   :out std_logic_vector(15 downto 0);

      cin   :in std_logic);

end carrylook_ahead2;

architecture Behavioral of carrylook_ahead2 is

signal  p ,g : std_logic_vector( 15 downto 0);

signal  c: std_logic_vector( 16 downto 0);

begin

c(0)<= cin;

l1: for i in 0 to 15 generate

p(i)<= a1(i) xor b1(i);

g(i)<=a1(i) and b1(i);

s1(i)<=p(i) xor c(i);

c(i+1)<=g(i) or (p(i) and c(i));

end generate;

end Behavioral;