This guide isn’t supposed to include every little detail of either Icarus Verilog or GTKWave, but the Icarus Verilog is a free Verilog simulation and synthesis tool. The main aim of this document is to give some of the important and necessary steps in installation of Icarus Verilog (iverilog) simulator in different environments . A quickstart guide on how to use Icarus Verilog. Contribute to albertxie/iverilog- tutorial development by creating an account on GitHub.

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For synthesis, the compiler generates netlists in the desired format.

User Guide

You will need a text editor capable of icarue highlighting and smart indenting. The simplest is to list the files on the command line: These are articles that describe in clear prose, with examples, the basics of using Icarus Verilog.

It should show a window like this: As designs get larger and more complex, they gain hierarchy in the form of modules that are instantiated within icaurs it becomes convenient to organize them into multiple files. To get set up: Typically, there is one module that instantiates other modules but is not instantiated by any other modules.

Finally, install the Scansion waveform viewer from this page. Access the git repository of Icarus Verilog with the commands:.

Getting Started

Now open up any Verilog file i. Windows First, let’s take care of the software installation: The command file technique clearly supports much larger designs simply by saving you the trouble of listing all the source files on the command line.

It operates as a compiler, compiling source code written in Verilog IEEE into some target format. Next, execute the compiled program thtorial so:.


There is also a test icsrus available. The results of this compile are placed into the file “hello”, because the “-o” flag tells the compiler where to place the compiled result.

What sort of output the compiler actually creates is controlled by command line switches, but normally it produces output in the default vvp format, which is in turn executed by the vvp program. The first step, the “iverilog” command, read and interpreted the source file, then generated a compiled result. Open the zipfile, and drag the tutorial1 folder to your Desktop.

Access the git repository of Icarus Verilog with the commands: I’ll be adding a credits page someday, although the source distributions do in general name names. As designs get even larger, they become spread across many dozens or even hundreds of files.

Before getting started with actual examples, here are a few notes on conventions.

Although both sections are written in prose with examples, the second section is more detailed and presumes the basic understanding of the first part. The quick links above will show the current stable release.

If there are no such modules, the compiler will not be able to choose any root, and the designer must use the “-s root ” switch to identify the root module, like this:. The “iverilog” and “vvp” commands are the most important commands available to users of Icarus Verilog.

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You can verify this in the Windows Explorer, or by running the command dir which should output something like this: Who is Icarus Verilog? Volume in drive C has no label. This is called a root module. If instead, you see an error message, you’ll need to fix your PATH variable, which the installer doesn’t get right sometimes.


Icarus Verilog is a Verilog simulation and synthesis tool. As designs get more complicated, they almost certainly contain many Verilog modules that represent the hierarchy of your design.

The “vvp” command of the second step interpreted the tutorizl file from the first step, causing the program to execute.

You can compile it entirely with free tools, too, although there are precompiled binaries of stable releases. Another technique is to use a commandfile, which lists the input files in a text file.

Verilog Tutorial with ICarus| Verification

tutoriap And there it is, the program has been executed. That is as it should be. The “-s” flag identifies a specific root module and also turns off the automatic search for other root modules.

This is the source for your favorite free implementation of Verilog! Name the files that are part of the design in the command file and use the “-c” flag to tell tutorual to read the command file as a list of Verilog input files. Then, open the disk image and run the installer. Accept all of the default choices as you click through the installation. These snapshots follow development progress, and, although the latest features are included in this source, compatibility from snapshot to snapshot is not guaranteed.