Learn Verilog
A free, interactive online Verilog course. You write Verilog on every lesson, with AI hints when your simulation output doesn't match what you expected, and a free certificate when you finish.
4,597+ codders enrolled
128 lessons127 challenges628 quiz questions
- Beginner friendly
AI-assisted coding help
Hands-on interactive lessons
Audio narration on every lesson
Quizzes to test your knowledge
Free certificate of completion
Syllabus
Section 1
Fundamentals
Start sectionStartBuild a strong foundation in digital design with core Verilog skillsIntroduction
5 lessons433Data Types
7 lessons853Number System
6 lessons646Operators Part 1
5 lessons535Operators Part 2
6 lessons647Modules
7 lessons755Assign And Gates
6 lessons648Half Adder Project
3 lessons3Procedural Blocks
6 lessons646Decision Making
6 lessons634Loops
6 lessons646Multiplexer Project
3 lessons3Timing And Delays
6 lessons645Testbench Basics
6 lessons644Traffic Light Controller
Project5 lessons5Final Challenges
3 lessons3UART
Project4 lessons4Section 2
RTL Design & Verification
Start sectionStartBuild reliable Verilog RTL with complete combinational logic, signed arithmetic, reusable modules, controlled pipelines and explicit memory behavior. Verify designs with self-checking testbenches, mastery challenges and a Sample Monitor project.Reliable Combinational RTL
5 lessons916Widths and Signed Arithmetic
5 lessons916Reusable RTL
5 lessons916Controlled Sequential RTL
5 lessons916Memory and Lookup Tables
5 lessons916Self-Checking Testbenches
5 lessons916Project - Sample Monitor
5 lessons5Final Challenges
3 lessons3
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January 2026
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI, or look up anything you've already covered. Every lesson meets you where you are.
A variable is a named container that stores a value you can reference later in your program.
In Python, you create one by writing the name, an equals sign, then the value you want to store.
The value can change over time. Reassigning the name simply points it to a new value.
Earn a Certificate
Earn certificates for every course you complete. Add them to your LinkedIn profile and resume to showcase your coding expertise to employers.
Certificate of CompletionPython Fundamentals
Add to LinkedInWhy learn Verilog with Coddy
- Write and simulate real Verilog in your browser. No Icarus, Vivado, or ModelSim install - each lesson compiles your Verilog module and runs the testbench server-side, then shows the simulation output and any compile errors instantly.
- Verilog as digital designers actually use it: modules and ports, wires vs. registers, gate primitives (AND/OR/NOT/XOR), blocking vs. non-blocking assignments, combinational and sequential always blocks, parameters, finite state machines, and testbenches with
$display,$monitor, and$dumpvars. The hardware description language foundations you need before touching an FPGA. - AI hints walk you through the parts of Verilog that trip everyone up - blocking vs. non-blocking inside always blocks, when to use
wirevs.reg, sized vs. unsized numbers, and the meaning ofxandzvalues - so you build the right mental model of hardware (not software) from lesson one. - Build real hardware projects, not just exercises - a half adder, a 2-to-1 and 4-to-1 multiplexer, a traffic light controller as an FSM, and a UART transmitter. Each project ships with its own testbench so you can see your design simulate end-to-end.
Frequently asked questions about learning Verilog
What is Verilog used for?
Verilog is a hardware description language (HDL) used to design and simulate digital circuits - FPGAs, ASICs, and the chips inside almost every modern device. Engineers describe hardware behavior in Verilog, simulate it to verify correctness, then synthesize it down to actual gates and flip-flops. It's the workhorse language at companies like Intel, AMD, NVIDIA, Apple, Qualcomm, and most FPGA shops.
Is Verilog hard to learn?
Verilog looks a lot like C, but the mental model is completely different - you're describing hardware that runs in parallel, not software that runs line by line. The syntax is easy; the hard part is thinking in terms of wires, registers, and clock edges instead of variables and function calls. The course introduces hardware thinking gradually, starting with simple combinational logic and building up to clocked always blocks, finite state machines, and full testbenches.
Verilog vs. VHDL - which should I learn?
Both are mainstream HDLs and do the same job. Verilog (and its successor SystemVerilog) dominates in the US semiconductor industry, big chip companies, and most modern verification flows. VHDL is more common in European industry, aerospace, and defense. If you don't have a specific employer in mind, Verilog is the safer first HDL - it's closer to C syntactically and has a larger ecosystem of free tools and open-source designs.
Do I need to know Verilog for FPGA work?
Yes - Verilog (or VHDL, or increasingly SystemVerilog) is how you describe what an FPGA actually does. Vendor tools like Vivado, Quartus, and Lattice Radiant all take Verilog/SystemVerilog as input. High-level synthesis (HLS) and visual tools exist, but anything beyond a toy project on an FPGA ends up being written or read in Verilog.
How long does it take to learn Verilog?
Verilog basics - modules, ports, wires, registers, operators, simple always blocks - take two to three weeks of daily practice. Becoming comfortable with finite state machines, testbenches, and the projects in this course (half adder, multiplexer, traffic light FSM, UART) usually takes another one to two months. The next step - running your designs on an actual FPGA board - is its own learning curve on top of the language itself.
Can I learn Verilog online for free?
Yes. The interactive Verilog course is free - full lessons, coding exercises, simulated testbenches, and a certificate. Verilog compiles and simulates server-side, so you don't need to install Icarus Verilog, Vivado, or any FPGA toolchain locally to start writing real HDL.
Do I get a certificate after the Verilog course?
Yes. Finishing the Verilog course gives you a free certificate of completion. A verifiable signal you can add to your resume or share on LinkedIn alongside any FPGA projects, RTL designs, or testbenches you've built.
