-- +-----------------------------+
-- |    Copyright 1996 DOULOS    |
-- |     Library: arithmetic     |
-- |    designer : Tim Pagden    |
-- |     opened:  3 Aug 1996     |
-- +-----------------------------+
 
-- Architectures:
--   03.08.96 original
 
architecture low_level of cla_6 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_c5: process (p, g, c_in)
  begin
    c(5) <= (p(5) and p(4) and p(3) and p(2) and p(1) and p(0) and c_in) or 
            (p(5) and p(4) and p(3) and p(2) and p(1) and g(0)) or
            (p(5) and p(4) and p(3) and p(2) and g(1)) or 
            (p(5) and p(4) and p(3) and g(2)) or 
            (p(5) and p(4) and g(3)) or
            (p(5) and g(4)) or
            g(5); 
  end process;

  p_propogate: process (p)
  begin
    p_out <= p(0) and p(1) and p(2) and p(3) and p(4) and p(5);
  end process;
 
  p_generate: process (p(5 downto 1), g)
  begin
    g_out <= (p(5) and p(4) and p(3) and p(2) and p(1) and g(0)) or 
             (p(5) and p(4) and p(3) and p(2) and g(1)) or 
             (p(5) and p(4) and p(3) and g(2)) or 
             (p(5) and p(4) and g(3)) or
             (p(5) and g(4)) or
             g(5); 
  end process; 
 
end low_level;

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