⚙️ FPGA Arithmetic Calculator – Verilog on DE10-Lite

A 4-bit arithmetic calculator implemented in Verilog and deployed on the Intel DE10-Lite FPGA.
This project performs addition and two’s-complement subtraction, displaying results on the seven-segment LED displays.
User inputs are controlled using on-board switches, and the result updates in real time based on selected mode.

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🎯 Objective

To design and implement a basic arithmetic logic unit (ALU) capable of:

• Performing 4-bit addition and subtraction
• Demonstrating two’s-complement subtraction logic
• Displaying inputs and results using seven-segment displays
• Operating entirely on FPGA hardware switches and LEDs

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🔩 Features

• 4-bit binary arithmetic in Verilog
• Mode control switch toggles between addition and subtraction
• Real-time output display on FPGA’s seven-segment LEDs
• Clean hardware-only execution — no microcontroller required
• Developed and tested on Intel Quartus Prime Lite with DE10-Lite

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🧠 Hardware Used

Component	Description
DE10-Lite FPGA Board	Intel MAX-10 based FPGA development board
Seven-Segment Displays	Used to display operands and arithmetic results
On-board Switches (SW0–SW9)	Input binary values and select operation mode
LEDR Indicators	Show input bits and active mode
Quartus Prime Lite Software	For HDL design, synthesis, and FPGA programming

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🧰 FPGA Demonstration

Below are annotated images showing the DE10-Lite FPGA board executing 4-bit arithmetic operations.
The calculator performs both addition and two’s-complement subtraction, with inputs entered through switches (SW) and results shown on seven-segment displays.

Figure 1: Initial setup — 0 + 0 = 0 (Binary: 0000 + 0000)

Figure 2: Addition — 1 + 3 = 4 (Binary: 0001 + 0011)

Figure 3: Subtraction — 5 − 7 = −2 (Binary: 0101 − 0111)

Figure 4: Subtraction — 8 − 6 = 2 (Binary: 1000 − 0110, subtraction mode ON)

Figure 5: Addition — 9 + 8 = B (Hexadecimal: 1001 + 1000 = 1011)

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🧑‍💻 Author

Shivam Gupta
💼 LinkedIn
💻 GitHub

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🏁 Summary

This FPGA project showcases a compact hardware arithmetic calculator built purely with digital logic in Verilog.
It demonstrates switch-based input, binary operations, and real-time hardware display — a strong foundation for building full ALU designs.