A 1-bit adder circuit accepts two 1-bit binary numbers and a carry input and outputs a 1-bit sum and a carry.
The next table shows the truth table for a 1-bit adder.
|Input1||Input0||Carry Input||Sum Output||Carry Output||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|
The logic circuitry for a 1-bit adder is shown in the following figure.
These are the instructions to play with the circuit:
This circuit can be encapsulated in a single module, as can be seen in the following figure :
A 4 - bit adder circuit is constructed in the next page.
Last modified 2/1/2000 by Juan de Lara ( Juan.Lara@ii.uam.es, http://www.ii.uam.es/~jlara) need help for using this courses?.