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Homework Help: 16 bit 2's complement adder. Due tomorrow

  1. Sep 8, 2008 #1
    16 bit 2's complement adder. Due tomorrow!!

    You are given two adders. Each adder has two 8-bit operand inputs
    and a 1-bit carry input. Each adder calculates the sum of the two
    8-bit 2's complement operands and the 1-bit carry and outputs an 8-bit
    sum and a 1-bit 2's complement overflow bit. Can you use the two
    adders to create a 16-bit 2's complement adder? If so, draw it (represent
    the adders as boxes with clearly labeled inputs and outputs). If not,
    explain why it is difficult.

    Help please
  2. jcsd
  3. Sep 8, 2008 #2


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    Science Advisor

    Re: 16 bit 2's complement adder. Due tomorrow!!

    Yes. The drawing and wiring are left as an exercise to the student :-)

    1) What happens to the 10s place when you add 15 and 27? What happened to the 1s place?
    2) What is the purpose of the carry INPUT?
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