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education/computer engineering/ECE2700/Adders.md
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# Carry-Select Adder # Carry-Select Adder
A carry select adder is built using two ripple carry adders, and multiplexing them together based off of the value of $c_{in}$. This is done for performance reasons, because as addition propagates through the ripple carry A carry select adder is built using two ripple carry adders, and multiplexing them together based off of the value of $c_{in}$. This is done for performance reasons, because when adding two numbers $x$ and $y$, we know $x$ and $y$ *before* we know the value of $c_{in}$. This means we can compute what the output of $x + y$