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. Abstract. This document briefly introduces how to use Icarus Verilog to simulate your design. You can get this tool from the CD-ROM of your textbook or course. DESCRIPTION. iverilog is a compiler that translates Verilog source code into executable programs for simulation, or other netlist formats for further processing.

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iverilog • help

Variables in the file are substituted. These are articles that describe in clear prose, with examples, the basics of using Icarus Manuql. This form is normally only used to trigger ifdef conditionals in the Verilog source.

This enables warnings for inconsistent use of the timescale directive.

The main porting target is Linux, although it works well on many similar operating systems. The two major parts cover working mxnual Icarus Verilog and Icarus Verilog details.

One that works with iVerilog 0. The output file is the Verilog input, but with file inclusions and macro references expanded and removed.


User Guide

Add this module to the list of VPI modules to be loaded by the simulation. The command file allows the ocarus to place source file names and certain command line switches into a text file instead of on a long command line. For example, “foo” matches “Foo. In fact, I’m still working on it, and will continue to work on it for the foreseeable future. Welcome to the home page for Icarus Verilog.


The dump happens after the design is elaborated and optimized. By default any mismatch is reported as a error. The value part of the token is optional. The path starts with the first non-white-space character. Variables are only substituted in contexts that explicitly support them, including file and directory strings. The vvp target generates code for the vvp runtime.

Although this behaviour is prescribed by the IEEE standard, it is not what might be expected and can have performance implications if the array is large. This extra verbosity ucarus be avoided by using the vvp command to indirectly execute the compiler output file.

iverilog • help

You will notice that the command lines include a reference to a key temporary file that passes information to the compiler proper. This will continue to be maintained until rendered obsolete by a new stable release. Preprocess the Verilog source, but do not compile it. All modules contained within iczrus file will be treated as library modules, and only elaborated if they are instantiated by other modules in the design. For batch simulation, the compiler can generate an intermediate form called vvp assembly.


This is the user guide: Enable default or disable support for extended types. If it finds such a file, it loads it as a Verilog source file, they tries again to elaborate the module. Retrieved from ” http: For synthesis, the compiler generates netlists in the desired format. I’ll be adding a credits page someday, although the source distributions do in general name names.

Library module files should contain only a single module, but this is not a requirement. If mode is includeonly files that are included by include directives are listed. Who is Icarus Verilog?

This enables warnings for ports of module instantiations that are not connected but probably should be.