To keep from losing information and redoing steps, save your files whenever you think of it.It takes in two numbers of 4 bits each, allowing us to take numbers 0-15, but we will be using numbers 0-9.The circuit is made in Quartus II and then is programmed onto a Field Programmable Gate Array (FPGA) which allows the circuit to be used.
This project is intended to be for fun or could be a final project for a class, but is mostly to become more familiar with logic circuits. This project will make more sense if you have already taken or are currently taking a digital logic class and have a basic understanding of logic gates. Some basic commands of Quartus are also covered if you have never used it. The FPGA has buttons, switches, LEDs, and number displays to accommodate most circuits. 4 Bit Adder Subtractor Circuit Software Is FreeQuartus 2 can be purchased for around 3,000-4,000; although, the web edition of the software is free, but still requires the purchase of an FPGA. I used the campus software, so I did not have to purchase any equipment. It took me 6 hours to complete the adder from scratch my first time. My hopes with these instructions are for you to be able to complete the 4-bit adder in less than 5 hours. Completion of this circuit will bring you greater understanding and fulfillment with its complexity. Note: Pictures at the beginning of each page show given steps in the process. 4 Bit Adder Subtractor Circuit Install Quartus Onto4 Bit Adder Subtractor Circuit Download Step 1They are to prevent confusion Add Tip Ask Question Comment Download Step 1: Starting Quartus 1) If not already installed, install Quartus onto your computer. Note: I did not have to install Quartus since I used a campus computer. Follow the installation wizard and everything should work fine. Open Quartus from your main window. The project wizard should appear. See Picture 4) The first page tells you about the project wizard. Click next to go to the next page. Select a directory to work from. It is best to create a folder specifically for any project you do. Name the project 4BitAdder. This will also appear as the top level design entity. Click to the next page. ![]() Choose the family name of the FPGA you have. Cyclone, stratix, etc.) 10) Your device will have a specific name given in the scroll bar. See Picture 11) The project will load with a blank screen saying Altera Quartus II. In the upper left corner, click on file, and then click on new from the drop down menu that appears. Select Block DiagramSchematic File (BDF) from the window that appears. See Picture 13) Save the file right away under the name 4BitAdder. ![]() You can also click on the floppy disk in the tool bar to save after parts are added.
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