686 TinyTapeout 4 bit ripple carry adder
686 : TinyTapeout 4 bit ripple carry adder
- Author: Georg Brink Dyvad
- Description: An adder made of 4 full-adders with the first full-adders c_in connected to ground.
- GitHub repository
- Open in 3D viewer
- View in Wokwi
- Clock: 0 Hz
How it works
The project adds two 4-bit numbers and outputs a 5-bit number as the result.
How to test
Inputs A0, A1, A2, and A3 are the bits for the first number to be added. A0 is the LSB. Same logic for the B input. The S0, S1, S2 and S3 output are the first 4 bits of the result with the 5th bit named C_OUT since its the carry-out.
External hardware
I used LED's for the output and switches for the inputs.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | A0 | S0 | |
| 1 | A1 | S1 | |
| 2 | A2 | S2 | |
| 3 | A3 | S3 | |
| 4 | B0 | C_OUT | |
| 5 | B1 | ||
| 6 | B2 | ||
| 7 | B3 |