Two Bit Adder
Design a circuit that will function as a two bit adder. It will have
four inputs and three outputs. The inputs will be two two-digit
numbers in binary. The output will be the sum of the inputs. All
combinations should work. Inputs and outputs will be in unsigned binary.
Hints
- You'll need to do this design in several stages
- Start with the truth table for a half adder
- Diagram a half adder (2 inputs, two outputs)
- Use the half adder to diagram a full adder (three inputs, two outputs)
- Use a series of full adders to build the two-bit adder
- Once you've provided a circuit, you can re-use that circuit in
another stage. (EG after you've documented the half-adder, you can
have some 'black boxes' called half adders in subsequent diagrams)
- You can use a diagramming tool such as dia or visio to generate
your circuits, you can draw circuits by hand and scan them, or you
can take screen shots of a circuit diagramming tool.
Expected Output
- Include a truth table for the half adder
- Create a diagram for half adder
- Create a diagram for full adder (can use half-adders)
- Create a diagram for two-bit adder (can use full adder)
- Add a paragraph describing what you have learned in this process
- Turn in your project as a web page on your phoenix account.
Have Fun!!!