Mux Adder

Discussion in 'Homework Help' started by burungapi, Oct 30, 2008.

  1. burungapi

    Thread Starter New Member

    Oct 29, 2008
    3
    0
    Im trying to figure out how to make a 1 bit adder from a 4:1 mux 54ls153. I understand from what people say that if you can make the truth table you can figure it out but that's where im stuck at. I have the truth table but just can't figure out how to impliment it. Appreciante any help you can offer :)

    truth table

    x y cin sum carry
    0 0 0 0 0
    0 0 1 1 0
    0 1 0 1 1
    0 1 1 0 1
    1 0 0 1 0
    1 0 1 0 1
    1 1 0 0 1
    1 1 1 1 1
     
  2. MareBear

    Member

    Oct 29, 2008
    22
    0
    taken from a previous post with the same question


    its been a while since ive done digital systems sorry i couldnt answer it :(, but at least i found the answer on the forums for you =]
     
  3. burungapi

    Thread Starter New Member

    Oct 29, 2008
    3
    0
    Yeah i found that one and i don't know if im just being dumb or something but im having trouble grasping that
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Arrange the inputs so the selection by the X & Y bits matches the desired condition from the truth table.
     
  5. burungapi

    Thread Starter New Member

    Oct 29, 2008
    3
    0
    cool i figured out problem. I was basically thinking too hard into it. I was looking at the inside of mux trying to figure out how to get it to do what i want. So it's not so much that it is an adder but that you bacially give it cases and what to push to output for each case.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Yep, it's just a truth table selector.
     
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