Need Help creating a circuit for multiplication

Discussion in 'Homework Help' started by joegreentea, Dec 13, 2011.

  1. joegreentea

    Thread Starter New Member

    Nov 22, 2011
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    Hiii

    I was trying to create a multiplication circuit 4 digit by 4 digit two's complement binary number. I was up to the point on the picture attached.
    Does it look right? or totally a mess.
    Please Help.
    Thanks,
     
  2. Georacer

    Moderator

    Nov 25, 2009
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    What does the small square stand for? Is it a full adder?
     
  3. joegreentea

    Thread Starter New Member

    Nov 22, 2011
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    Yes, it is a Full Adder.
     
  4. Georacer

    Moderator

    Nov 25, 2009
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    I 'd say it's correct. Do you need to simulate it?
     
  5. joegreentea

    Thread Starter New Member

    Nov 22, 2011
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    Thanks, Georacer.
    I've made the simulation, now that I plugged-in the binary numbers. I think it's multiply unsigned, how to make it able to handle 2's Complement?
    I'm guessing for multiplication, it's not like add/sub when it handles 2'c Complement.
     
  6. Georacer

    Moderator

    Nov 25, 2009
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    I 'll look into it, about the signed multiplication and I 'll come back to you.
     
  7. joegreentea

    Thread Starter New Member

    Nov 22, 2011
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    I think Multiply is more complicated than sub/add, it needs to partially invert its products and add 1 on the last bit somehow.
     
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