Full-adder is a `digital circuit ` to perform arithmetic sum of two bits and a previous carry. The circuit involves two half-adders & one OR gate. Alternately 2 XOR gates, 2 AND gates and 1 OR gate. Access `OR`, `AND` and `XOR` gates details from here

Block Diagram of full-adder is discussed next: So the expressions for the full adder are:-

Sum_out = [(in_x) XOR (in_y)] XOR [(carry_in)]
Carry_out = [(in_x) AND (in_y)] OR [ (in_x XOR in_y) AND carry_in ]

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Digital fundamentals.

Interview Questions.

##### By using equations above we can drive Truth Table for `Full Adder`. Details in table below. Verilog RTL example and test-bench for full-adder.

4 - bit Binary Adder implementation, block diagram and discussion.

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Symbol of Full Adder is shown below. Hope you liked! this page. Don't forgot to access relevant `previous and next sections ` with links below.