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;