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Any gate i can substitute to xor gate?

  1. Jan 15, 2009 #1
    any gate i can substitute to xor gate?
    if i dont have xor gate what gate i can use to substitute it?
     
  2. jcsd
  3. Jan 15, 2009 #2

    mgb_phys

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    If this is homework - what is XOR in boolean algebra ?

    In practical terms you can build any logic out of either NAND or NOR, most chips only implement one of these.
     
  4. Jan 15, 2009 #3
    define xor with a truth table.
     
  5. Jan 15, 2009 #4
    nope not a homework
    i want to make a binary adder cuircuit i dont have an xor gate only and, or & not.
     
  6. Jan 15, 2009 #5
    0 0 -0
    0 1-1
    1 0-1
    1 1-0
     
  7. Jan 15, 2009 #6
    xor = not(a).b + a.not(b)

    I also thought this is a homework problem. You can easily get this into and/or gates. If there are more than 2 inputs, you should be using k-maps. Once, you have in and/or gates, it is simple to convert it into nand (using Sum of products form) or nors (using products of sums or simply messing with bool algebra...)
     
  8. Jan 15, 2009 #7
  9. Jan 15, 2009 #8
    tnks
     
  10. Jan 15, 2009 #9

    mgb_phys

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    Isn't it, A or B and not( A and B)
     
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