or download this
enable_pad : INBUF port map (PAD => enable, Y => enable_c);
c_pad : INBUF port map(PAD => c, Y => c_c);
...
GND_i : GND port map(Y => \GND\);
Carry_O : MAJ3 port map(A => a_c, B => enableandc, C => b_c, Y => N
+_5);
modify : XOR2 port map (A=> c_c, B=> enable_c, Y => enableandc);