The circuit is a configurable full subtractor/adder.
When MODE = 1 the circuit functions as a full subtractor, when MODE = 0 the circuit functions as a full adder.
MODE = Mode configuration input, this controls what operation the circuit performs as already described above.
BiCi = Borrow Input / Carry Input
MdAg = Minuend/Augend Input
SdAd = Subtrahend/Addend Input
DfSf = Difference/Sum Output
BOfCOf = Borrow Output / Carry Output
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