🧠 Basic 4-bit Nano Processor

This is a minimalist 4-bit nano processor designed for educational and experimental use. It demonstrates the basics of CPU architecture using a simplified instruction set and core components implemented in VHDL.

🚀 Version: 1.0.0

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📦 Features

• 4-bit Data Width – Lightweight processor for small-scale computation
• Core Instructions:
  • ADD – Performs 4-bit addition
  • MOVE – Transfers data between registers
  • NEGATION – Computes the two’s complement of a value
  • JUMP IF ZERO – Conditional jump based on zero flag
• Implemented Components:
  • Register Bank
  • ALU (Arithmetic Logic Unit)
  • Instruction Decoder
  • Slow Clock Generator
  • Testbench for simulation

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🛠️ File Structure

File/Module	Description
register_bank.vhd	Stores values in multiple 4-bit registers
alu.vhd	Handles arithmetic operations
instruction_decoder.vhd	Decodes binary instructions
clock_gen.vhd	Slow clock generator for simulation timing
cpu_top.vhd	Top-level integration of CPU components
testbench.vhd	Simulates CPU behavior for testing

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🎯 Use Cases

• CPU architecture learning
• Instruction set experimentation
• Digital design education using VHDL
• Foundation for building more complex processors

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🔧 Getting Started

To simulate the processor:

1. Clone the repository.
2. Open the project in your VHDL simulator (ModelSim, GHDL, etc.).
3. Compile all VHDL files.
4. Run Nanoprocessor.vhd to observe functionality.

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📖 License

This project is open-source and free to use for educational purposes.

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👤 Author

Created by,

1. Lahiru Dilshan
2. Thilokya Angeesa
3. Sandaru Vidushan
4. Sandeni Vithanage

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📌 Note

This is Version v1.0.0. Future versions may add further instructions and functionality (like branching, memory, or extended instructions).