Configurable-Mode Ripple Subtractor/Adder

The circuit is an implementation of a configurable ripple subtractor/adder. When MODE = 1 the circuit functions as a ripple subtractor, when MODE = 0 the circuit functions as a ripple adder. Variables / Signal Names: MODE = Mode configuration input, this controls what operation the circuit performs as already described above. MdAg2 = Minuend/Augend Bit 2 SdAd2 = Subtrahend/Addend Bit 2 DifSum2 = Difference/Sum Bit 2 MdAg1 = Minuend/Augend Bit 1 SdAd1 = Subtrahend/Addend Bit 1 DifSum1 = Difference/Sum Bit 1 MdAg0 = Minuend/Augend Bit 0 SdAd0 = Subtrahend/Addend Bit 0 DifSum0 = Difference/Sum Bit 0 BoCo = Borrow Output / Carry Output