4-bit Nanoprocessor Design

This project implements a simple 4-bit nanoprocessor as part of the Computer Organization and Digital Design module in semester 2 of Computer Science and Engineering at the University of Moratuwa.

Project Overview

The nanoprocessor is designed to execute a set of 4 instructions:

1. MOVI - Move immediate value to register
2. ADD - Add values in two registers
3. NEG - 2's complement of a register
4. JZR - Jump if register value is zero

High-Level Diagram

Key Components

• 4-bit Add/Subtract unit
• 3-bit adder for Program Counter
• 3-bit Program Counter
• Register Bank (8 4-bit registers)
• Program ROM
• Instruction Decoder
• Various multiplexers (2-way 3-bit, 2-way 4-bit, 8-way 4-bit)

Features

• 4-bit data processing
• 3-bit program counter
• 12-bit instruction format
• Ability to perform basic arithmetic and control flow operations

Implementation

The nanoprocessor is implemented using VHDL and designed to run on a BASYS 3 FPGA board.

Usage

1. Clone this repository
2. Open the project in your preferred VHDL IDE (e.g., Vivado)
3. Synthesize and implement the design
4. Program the BASYS 3 board with the generated bitstream
5. Use the onboard switches and buttons to input data and control the processor
6. Observe the results on the LED outputs and 7-segment display

Team Members

• https://github.com/pererabsdt
• https://github.com/SithumBimsara20030113
• https://github.com/KaveeshaKapuruge
• https://github.com/jayasinghesasmitha