132 Ripple Carry Adder 8 bit
132 : Ripple Carry Adder 8 bit
- Author: Jason Kaufmann
- Description: Adds two 8 bit numbers together
- GitHub repository
- Open in 3D viewer
- Clock: 0 Hz
How it works
The "Ripple Carry Adder 8 bit" project adds two 8-bit numbers together using a ripple carry adder (RCA) architecture. This is implemented using a series of full adders, each of which adds two bits along with a carry-in from the previous less significant bit. The result is an 8-bit sum and a carry-out bit for the most significant bit.
The project consists of the following modules:
halfadder: A simple module that computes the sum and carry-out of two 1-bit inputs.fulladder: A module that uses twohalfadderinstances to add three 1-bit inputs (two bits and a carry-in) and produces a sum and carry-out.rca8: An 8-bit ripple carry adder module that cascades eightfulladderinstances to add two 8-bit numbers.tt_um_example: The top module that connects the inputs and outputs to therca8module, performing the addition operation and providing the result through the output pins.
The tt_um_example module takes two 8-bit inputs (ui_in and uio_in), adds them using the rca8 module, and outputs the 8-bit sum (uo_out).
How to test
To test the "Ripple Carry Adder 8 bit" project:
- Provide two 8-bit numbers as inputs via the
ui_inanduio_inpins. - Observe the 8-bit sum output on the
uo_outpins. - Ensure that all connections are made correctly as per the pinout configuration.
For example, if you input the binary numbers 00001101 (13 in decimal) and 00000111 (7 in decimal) on ui_in and uio_in respectively, the output on uo_out should be 00010010 (20 in decimal).
External hardware
No external hardware is required for this project. It operates purely based on the digital inputs provided and generates a digital output. However, for testing and demonstration purposes, you may use input switches and output LEDs or a similar setup to visualize the input and output binary numbers.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | A0 | OUT0 | B0 |
| 1 | A1 | OUT1 | B1 |
| 2 | A2 | OUT2 | B2 |
| 3 | A3 | OUT3 | B3 |
| 4 | A4 | OUT4 | B4 |
| 5 | A5 | OUT5 | B5 |
| 6 | A6 | OUT6 | B6 |
| 7 | A7 | OUT7 | B7 |