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7. Multibit Addition

  • A circuit for adding two 4-bit binary numbers: 4-bit full adder

    So far we explored a one-bit full adder.

  • To add multiple binary bits together, we must include a possible carry over from the lower order of magnitude, and send it as an input carry to the next higher order of magnitude bit.

  • Multibit addition requires full adders with carry lines to be cascaded (chained together.)

  • See also: binary subtraction article.

  •   4-bit full adder

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