How does a full subtractor work?

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A full subtractor is designed to perform subtraction on binary numbers, accounting for both the minuend and subtrahend, as well as any borrow from previous operations. The key components include Borrow-in and Borrow-out, which manage the borrowing process when the minuend is smaller than the subtrahend. Understanding how these borrow signals function is crucial for implementing a full subtractor, especially in multi-bit binary subtraction. The diagram referenced may provide a visual aid, but clarity on the borrow mechanics is essential for successful project completion. Mastering these concepts will enhance the ability to work with full subtractors effectively.
mattbonner
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I understand how a full-adder functions, it's simple enough. However, I'm having a hard time grasping how a full-subtractor works...

I found this diagram

http://www.art-sci.udel.edu/ghw/phys245/05S/assignments/answers/images/13-35sub.gif

but I'm not understanding how the Borrow-in's and the Borrow-out's work...
 
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I have the same problem , i got this project i need to do with full subtractor but i can't figure it out how should i do it. Its a subtractor for 2 bit binary numbers.
 

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