VCC_i : VCC port map(Y => \VCC\);
    
    sum_1_SUM0_0 : XOR3 port map(A => b_e, B => a_e, C => c_e, Y => sum_c);
        
    carry_pad : OUTBUF port map(D => N_5, PAD => carry);
    
    a_pad : INBUF port map(PAD => a, Y => a_c);