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Carry Save Adder

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Carry Save Adder

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    1. Carry Save Adder CME 433 Presented by: Richard Aramenko Luke Brisebois

    2. Carry Save Adder A digital adder Used to sum 3 or more binary numbers Outputs two numbers of equal dimensions as the input This unique dual output consists of: One sequence of partial sum bits One sequence of carry bits

    3. Application The most important: Calculating partial products in integer multiplication Additional application includes: Adding a large number of inputs together

    4. Advantages and Disadvantages Advantages: Produces all of its outputs in parallel resulting in the same delay as a full adder Very little propagation delay when implemented Carry Save Adder plus a ripple adder = n+1 Two Ripple Carry adders = 2n Allows for high clock speeds

    5. Advantages and Disadvantages Disadvantages We do not know whether the result is positive or negative This is a drawback when performing modular multiplication since you dont know whether the intermediate result is greater or less than the modulus

    6. Circuit Block

    7. Example

    8. The End

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