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How does a full subtractor work?

  1. Oct 10, 2009 #1
    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...
     
  2. jcsd
  3. Jun 14, 2010 #2
    I have the same problem , i got this project i need to do with full subtractor but i cant figure it out how should i do it. Its a subtractor for 2 bit binary numbers.
     
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