Full-adder is a combinational circuit that can add three bits. The three bits include two significant bits and a previous carry. Full-adder is a combination of two half adders and an OR gate.

Truth Table

Input Output
x y Carry In sum carry Out
0 0 0 0 0
0 0 1 1 0
0 1 0 1 0
0 1 1 0 1
1 0 0 1 0
1 0 1 0 1
1 1 0 0 1
1 1 1 1 1

Block diagram for full-adder

Robin

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