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Combinational Logic







BINARY ADDER-SUBTRACTOR







Half Adder






  • The truth table is as shown below:



  • x y C S
    0 0 0 0
    0 1 0 1
    1 0 0 1
    1 1 1 0




    Full Adder



    x yz Carry Sum
    0 0 00 0
    00 1 0 1
    0 1 0 0 1
    0 1 1 1 0
    1 0 0 0 1
    1 0 1 1 0
    1 1 0 1 0
    1 1 1 1 1





    Full adder using two half adders






    Binary Adder





    Carry Propagation






    Carry Look-ahead Generator







    Binary Adder - Subtractor





    Half Subtractor





    Full Subractor :



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