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Icarus Verilog

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Title: Icarus Verilog  
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Subject: List of HDL simulators, Comparison of EDA software, SystemVerilog DPI, OpenVera, ModelSim
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Icarus Verilog

Icarus Verilog
Developer(s) Stephen Williams
Stable release 0.9.7 / 26 August 2013 (2013-08-26)
Written in C++
Operating system Linux, FreeBSD, OpenSolaris, AIX, Microsoft Windows, and Mac OS X
Platform Cross-platform
Available in English
Type Verilog Simulator
License GNU General Public License

Icarus Verilog is an implementation of the Verilog hardware description language. It supports the 1995, 2001 and 2005 versions of the standard, portions of SystemVerilog, and some extensions.

Icarus Verilog is available for Linux, FreeBSD, OpenSolaris, AIX, Microsoft Windows, and Mac OS X. Released under the GNU General Public License, Icarus Verilog is free software.

As of release 0.9, Icarus is composed of a Verilog compiler (including a Verilog preprocessor) with support for plug-in backends, and a virtual machine that simulates the design.


Not even the author quite remembers when the project was first started, but CVS records go back to 1998. There have been releases 0.2 through the current stable release 0.9.

Icarus Verilog development is done largely by the sole regular author, Stephen Williams. Some non-trivial portions have been contributed as accepted patches.

External links

  • Icarus Verilog official web site
  • Sourceforge page
  • Icarus Verilog documentation wiki
  • Icarus Verilog installer for Microsoft Windows
  • Online interface to Icarus Verilog
  • Open Source in Electronic Design Automation
  • Icarus Verilog: Open-Source Verilog More than a Year Later
  • EDA Playground - run Icarus Verilog simulations from the web browser

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