Share Before getting started with actual examples, here are a few notes on conventions. First, command lines and sequences take the same arguments on all supported operating environments, including Linux, Windows and the various Unix systems. Under Windows, the commands are invoked in a command window. Second, when creating a file to hold Verilog code, it is common to use the ". This is not a requirement imposed by Icarus Verilog, but a useful convention. Some people also use the suffixes ".

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Media Home Welcome to the home page for Icarus Verilog. This is the source for your favorite free implementation of Verilog! What Is Icarus Verilog? Icarus Verilog is a Verilog simulation and synthesis tool. It operates as a compiler, compiling source code written in Verilog IEEE into some target format. For batch simulation, the compiler can generate an intermediate form called vvp assembly.

For synthesis, the compiler generates netlists in the desired format. Icarus Verilog is a work in progress, and since the language standard is not standing still either, it probably always will be.

That is as it should be. However, I will make stable releases from time to time, and will endeavor to not retract any features that appear in these stable releases. The quick links above will show the current stable release. The main porting target is Linux, although it works well on many similar operating systems.

Various people have contributed precompiled binaries of stable releases for a variety of targets. These releases are ported by volunteers, so what binaries are available depends on who takes the time to do the packaging. Icarus Verilog has been ported to That Other Operating System, as a command line tool, and there are installers for users without compilers. You can compile it entirely with free tools, too, although there are precompiled binaries of stable releases.

Where is Icarus Verilog? Updates to the stable release may be made from time to time to fix problems, but there should be no compatibility issues within this version series.

This will continue to be maintained until rendered obsolete by a new stable release. The files are gzip compressed tar files that contain the source and makefiles. These snapshots follow development progress, and, although the latest features are included in this source, compatibility from snapshot to snapshot is not guaranteed. And finally, the current "git" repository is available for read-only access via anonymous git cloning.

This allows for those who which to track my progress and contribute with patches timely access to the most bleeding edge copy of the source. From here, you can use normal git commmands to update your source to the very latest copy of the source. A Test Suite? There is also a test suite available. The test suite is also accessible as the ivtest github.

Only the git source. Who is Icarus Verilog? Even so, I am a software engineer writing software for hardware designers, so expect the occasional communications glitch:- There is also a cast of characters who have contributed patches, tests, and various bits to the project. See the git logs to get an idea of the breadth of the contributor base.

The mailing lists for Icarus Verilog are hosted by sourceforge. See the gEDA home page for information about that project, and information about how to join the mailing list. While Icarus Verilog is not literally part of the gEDA project, we cooperate and try to support each other. Icarus Verilog users are often gEDA users as well.


Icarus Verilog



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