🧠 Nano Processor Design – VHDL Implementation Welcome to the repository for my Nano Processor project, implemented using VHDL and simulated on the Xilinx Vivado platform. This repository contains modular components of a 4-bit Nano Processor architecture, detailed designs, simulations, timing diagrams, and enhancements.

📌 Table of Contents

• Introduction
• Components Design
  • Program ROM
  • Buses
  • Instruction Decoder
  • Program Counter
  • Register Bank
  • Multiplexers
  • 4-bit Add/Subtract Unit
  • 3-bit Adder
• Structure of Instructions
• High-Level Diagram of the Nano Processor
• Improved Nano Processor
• Detailed Modules and Simulations
• Clock Generator
• Getting Started
• License

License

🧾 Introduction This project demonstrates the complete design of a 4-bit Nano Processor from the ground up using VHDL. The design focuses on modularity and includes a fully functional improved version with enhanced instruction decoding and arithmetic operations.

🔧 Components Design

• Program ROM
  Instruction memory for the processor's operation.

• Buses
  Data and control signal pathways between modules.

• Instruction Decoder
  Decodes instruction bits into control signals.

• Program Counter
  Manages the execution flow by addressing instructions.

• Register Bank
  Temporary storage for data processing.

• Multiplexers
  Includes:
    • 8-Way 4-Bit MUX
    • 2-Way 3-Bit MUX
    • 2-Way 4-Bit MUX

• 4-bit Add/Subtract Unit
  Performs binary addition and subtraction.

• 3-bit Adder
  Used for internal counter and address logic.

📘 Structure of Instructions  Detailed explanation of the binary instruction format used by the processor.

📊 High-Level Diagram  Includes block diagrams for overall system architecture and component interconnection.

🚀 Improved Nano Processor This version includes:

• Enhanced ALU with more operations
• Optimized control logic
• Improved instruction set

Includes:

• Design & simulation source files
• Elaborated and implemented schematics
• **Timing

🧪 Detailed Modules and Simulations Each component in this repo includes:

📊 High-Level Diagrams

🧩 Basic Nano Processor Architecture

This diagram represents the core structure of the initial Nano Processor design, illustrating how each module communicates and works together to execute instructions.

Figure: High-Level Architecture of the Basic Nano Processor

📌 Includes: Program ROM, Program Counter, Instruction Decoder, Register Bank, ALU, and Multiplexers.

---

🚀 Improved Nano Processor Architecture

The improved design adds more functionality, including extended instruction support and enhanced control logic, enabling better performance and versatility.

Figure: High-Level Architecture of the Improved Nano Processor

🆕 Improvements include: Better ALU support (e.g., logical ops), refined instruction decoding, and optimizations in register access.

---

✅ Design Source File

🔍 Elaborated Design Schematic

💻 Simulation Source File

⏱️ Timing Diagram

⏰ Slow Clock A clock divider for producing a slower clock signal, helpful in simulation and testing.

🛠️ Getting Started Prerequisites Xilinx Vivado

Basic understanding of VHDL and digital design

How to Run Clone the repository:

bash Copy Edit git clone https://github.com/your-username/nano-processor.git cd nano-processor Open Vivado and import the source files.

Run elaboration, synthesis, implementation, and simulation.

Use the included testbenches and observe timing diagrams.

📄 License This project is licensed under the MIT License – see the LICENSE file for details.

🙌 Acknowledgments Special thanks to the University of Moratuwa and the Department of Computer Science and Engineering for academic support.