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 two halfadder instances 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 eight fulladder instances to add two 8-bit numbers.tt_um_example: The top module that connects the inputs and outputs to the rca8 module, 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).
To test the “Ripple Carry Adder 8 bit” project:
ui_in and uio_in pins.uo_out pins.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).
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.
| # | 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 |