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Im confused on how to use the dedicated carry logic The first image shows the schematic for a full adder using a MUX It looks like one of the outputs are equivalent to A XOR B

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Usually you just need to use the behavioral addition operator + and the synthesis tools will do the Right Thing. The documentation should give you information about inferring a fast adder, if it is more difficult than that.

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  • \$\begingroup\$ Yes but im interested in physically how its implemented \$\endgroup\$
    – Yogi Bear
    Jan 30, 2021 at 15:43
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    \$\begingroup\$ Well then you asked the wrong question. You said you wanted to know "how to use" the dedicated logic. The diagrams you copied into your question show you pretty clearly how it is implemented. \$\endgroup\$ Jan 30, 2021 at 15:45

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