sum_1_SUM0_0 : XOR3 port map(A => b_e, B => a_e, C => c_e, Y => sum_c); a_pad : INBUF port map(PAD => a, Y => a_c); sum_1_CO0_i : MAJ3 port map(A => a_e, B => c_e, C => b_e, Y => N_5);