369 2-Bit Adder
369 : 2-Bit Adder
- Author: Daniel Hönlinger
- Description: Adds 2 2-bit numbers and outputs a 2-bit result with a 1-bit carry out signal
- GitHub repository
- Open in 3D viewer
- View in Wokwi
- Clock: 0 Hz
How it works
A half-adder and a full-adder are used to build a 2-bit adder with a carry out signal.
Two 2-bit numbers will be added and produced result will be given as 2 Bits and a 1 Bit carry out signal.
How to test
Set the inputs according to the following truth table and check if the outputs match the truth table:
| input a and b | output result | output cout |
|---|---|---|
| 00 00 | 00 | 0 |
| 00 01 | 01 | 0 |
| 00 10 | 10 | 0 |
| 00 11 | 11 | 0 |
| 01 00 | 01 | 0 |
| 01 01 | 10 | 0 |
| 01 10 | 11 | 0 |
| 01 11 | 00 | 1 |
| 10 00 | 10 | 0 |
| 10 01 | 11 | 0 |
| 10 10 | 00 | 1 |
| 10 11 | 01 | 1 |
| 11 00 | 11 | 0 |
| 11 01 | 00 | 1 |
| 11 10 | 01 | 1 |
| 11 11 | 10 | 1 |
External hardware
Switches or buttons for input signals
LEDs for output signals
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | First Number - Bit 0 | Result - Bit 0 | |
| 1 | Second Number - Bit 0 | Result - Bit 1 | |
| 2 | First Number - Bit 1 | Carry Out | |
| 3 | Second Number - Bit 1 | ||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |