4-bit 2’s complement format adder/subtractor circuit Subtractor vhdl circuits circuit Vhdl tutorial – 11: designing half and full-subtractor circuits
Adders and Subtractors in Digital Logic - GeeksforGeeks
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4-bit 2’s complement format adder/subtractor circuit - Multisim Live
Adders and Subtractors in Digital Logic - GeeksforGeeks
VHDL Tutorial – 11: Designing half and full-subtractor circuits