technifyed

Computer Engineering + Systems and Cloud

Design a simple processor in a logic simulator

Build an 8-bit processor with an ALU, registers and a control unit, and run a small program on it.

  • DifficultyAdvanced
  • Estimated time1–3 months
  • Budget₹0
  • ClassCollege, years 2–4
  • TeamSolo or up to 3
  • You needComputer only

Prerequisites: Digital logic: gates, flip-flops, multiplexers

Original · by TechnifyedEngineering DesignSimulationFree to doComputer onlyWell documentedTwo subjects

My projects

Overview

In a free logic simulator you can build a working computer from gates: an arithmetic unit, registers, memory and a control unit that steps through fetch, decode and execute.

Why build this?

Nothing explains how a computer works as well as building one that runs your own program.

What you will learn

  • How an ALU performs arithmetic and logic
  • How a control unit sequences operations
  • How instructions are encoded
  • How to test hardware systematically

Skills you will use

Digital designInstruction encodingTesting

Materials and tools

  • Computer
  • A free logic circuit simulator

Tools and software

Circuit simulator

Expected cost₹0Nothing to buy
Estimated duration1–3 months6 build steps, plus the report

Step-by-step roadmap

  1. Start

    You will finish with: a working processor, its instruction table and a program running on it.

  2. 1

    Prerequisites

    Know this first: digital logic: gates, flip-flops, multiplexers. Then collect the 2 items in the materials list.

  3. 2

    Learn

    • How an ALU performs arithmetic and logic
    • How a control unit sequences operations
    • How instructions are encoded
    • How to test hardware systematically
  4. 3

    Plan

    List the features for version one, sketch the screens or data flow and pick the tools. Keep the first version small.

  5. 4

    Build

    1. Build and test an 8-bit adder, then an ALU with four operations.
    2. Build two registers and a program counter.
    3. Add memory holding instructions and data.
    4. Define eight instructions and their binary codes.
    5. Build the control unit that runs fetch, decode and execute.
    6. Write a program that adds numbers in a loop and run it.
  6. 5

    Test

    Step the clock by hand and check the register values after every instruction.

  7. 6

    Document

    Write a README: what it does, how to run it, screenshots and what you learned. Report structure

  8. 7

    Present

    Show a live demo of one complete task, then the design and the hardest problem you solved. Presentation structure · Viva questions

  9. 8

    Publish

    Put the code on GitHub with the README and, if you can, deploy a live demo.

Expected outcome

A working processor, its instruction table and a program running on it.

Other versions of this project

Beginner version

Build only a 4-bit ALU and test it.

Advanced version

Add a stack, subroutine calls and a simple assembler.

Research version

Compare single-cycle and multi-cycle designs for speed and gate count.

Make this project better

  1. BasicBuild only a 4-bit ALU and test it.
  2. This projectDesign a simple processor in a logic simulator
  3. AdvancedAdd a stack, subroutine calls and a simple assembler.
  4. ResearchCompare single-cycle and multi-cycle designs for speed and gate count.

Ways to do this project

Text marked "You write this" is a prompt for your own work; everything else is specific to this project.

Research question
You write thisOne question you can answer with data, narrow enough to finish in the time you have.
Hypothesis
You write thisWhat you expect to find, and why.
Variables
You write thisWhat you change or compare, what you measure, and what you hold constant.
Methodology
Compare single-cycle and multi-cycle designs for speed and gate count.
Data collection
You write thisSay what you will record, how many times, and how you will keep the records safe.
Analysis
You write thisChoose the table, chart or test that answers the question; report averages with their spread.
Limitations
You write thisList what could have affected the result: small sample, instrument limits, things you could not control.

Literature review

Find five to eight sources (your textbook, review articles, reports) and note what each says about your question. Group them by idea, not one after another, and end with what is still not known.

References

List every source you used in one style throughout (author, year, title, where it was published, link and the date you opened it).

Working as a team

Solo or up to 3. Suggested roles:

FrontendBackendData or modelDesignTestingDocumentationPresentation

Report and presentation

Report structure

  1. Title and summary
  2. Problem and target user
  3. Features
  4. Tools and technology
  5. Design: architecture, data model or screens
  6. Implementation
  7. Testing
  8. Results and screenshots
  9. Challenges
  10. Future improvements
  11. References

Presentation structure

  1. The problem
  2. Who it is for
  3. Live demo
  4. How it is built (one diagram)
  5. The hardest part
  6. Testing and results
  7. What you learned
  8. What comes next

Viva questions

Try answering before you open each one.

What is the program counter?

A register holding the address of the next instruction.

What happens in the fetch step?

The instruction at the program counter's address is read into the instruction register.

How does a jump work?

The control unit loads a new address into the program counter.

What limits your processor's speed?

The longest signal path between clock edges.

Resources

Source and attribution

Original

Written by Technifyed. Free to use for your own school or college project; write the report in your own words. Added 1 Oct 2026.

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