🔢 4-Bit ALU (Arithmetic Logic Unit) – Verilog Project

📌 Description This project is a basic 4-bit Arithmetic Logic Unit (ALU) designed using SystemVerilog. An ALU is a core part of a processor that performs arithmetic and logical operations. This beginner-friendly module supports 8 essential operations and helps students understand the backbone of how CPUs process binary data.

⚙️ Operations Supported The ALU performs the following operations based on a 3-bit opcode:

Opcode	Operation	Description
000	ADD	a + b
001	SUBTRACT	a - b
010	AND	a & b
011	OR	`a
100	XOR	a ^ b
101	NOT A	~a
110	INCREMENT A	a + 1
111	DECREMENT A	a - 1

💡 Real-Time Application (Simplified) This mini-ALU project is a basic building block of real processors. In real devices like calculators, embedded systems, or even mobile CPUs:

• ALUs perform fast math and logic operations.
• Multiple ALUs work together to handle different instructions.
• This 4-bit version is a smaller model used to understand how larger ALUs work in real systems.

🛠️ How to Simulate You can simulate this design using:

EDA Playground** (Online) ModelSim / Icarus Verilog** (Local)

💻 Files Included:

• alu_4bit.sv – ALU logic
• tb_alu_4bit.sv – Testbench for simulation

✅ Steps:

1. Paste the code in EDA Playground.
2. Select SystemVerilog and a simulator like Icarus Verilog.
3. Run the simulation and observe outputs in the terminal.

---

📈 Future Updates

• Add 8-bit ALU support.
• Include overflow and carry flags.
• Create a simple CPU block with control unit + ALU.
• Add waveform-based test cases.

📚 Topics Covered

• Verilog/SystemVerilog Basics
• Case Statements & Opcodes
• Combinational Logic
• Testbenches & Simulation

🙌 Contribution Beginner-friendly. Fork it, run it, modify it. Learn digital design hands-on! 😊