-- +-----------------------------+
-- |    Copyright 1996 DOULOS    |
-- |     Library: arithmetic     |
-- |    designer : Tim Pagden    |
-- |     opened: 25 Jul 1996     |
-- +-----------------------------+
 
-- Architectures:
--   25.07.96 low_level

architecture low_level of cla_5 is
 
begin
 
  p_c0: process (p(0), g(0), c_in)
  begin
    c(0) <= (p(0) and c_in) or 
            g(0);
  end process;

  p_c1: process (p(1 downto 0), g(1 downto 0), c_in)
  begin
    c(1) <= (p(1) and p(0) and c_in) or 
            (p(1) and g(0)) or  
            g(1); 
  end process;

  p_c2: process (p(2 downto 0), g(2 downto 0), c_in)
  begin
    c(2) <= (p(2) and p(1) and p(0) and c_in) or 
            (p(2) and p(1) and g(0)) or
            (p(2) and g(1)) or 
            g(2); 
  end process;

  p_c3: process (p(3 downto 0), g(3 downto 0), c_in)
  begin
    c(3) <= (p(3) and p(2) and p(1) and p(0) and c_in) or 
            (p(3) and p(2) and p(1) and g(0)) or
            (p(3) and p(2) and g(1)) or 
            (p(3) and g(2)) or 
            g(3); 
  end process;

  p_c4: process (p, g, c_in)
  begin
    c(4) <= (p(4) and p(3) and p(2) and p(1) and p(0) and c_in) or 
            (p(4) and p(3) and p(2) and p(1) and g(0)) or
            (p(4) and p(3) and p(2) and g(1)) or 
            (p(4) and p(3) and g(2)) or 
            (p(4) and g(3)) or
            g(4); 
  end process;

  p_propogate: process (p)
  begin
    p_out <= p(0) and p(1) and p(2) and p(3) and p(4);
  end process;
 
  p_generate: process (p(4 downto 1), g)
  begin
    g_out <= (p(4) and p(3) and p(2) and p(1) and g(0)) or 
             (p(4) and p(3) and p(2) and g(1)) or 
             (p(4) and p(3) and g(2)) or 
             (p(4) and g(3)) or
             g(4); 
  end process; 
 
end low_level;