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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User Guide

If mode is moduleonly files that are specified by the user or that are automatically loaded manuak library support are listed. This allows the user to manuao at compile time defparam a parameter in a root module instance. These are articles that describe in clear prose, with examples, the basics of using Icarus Verilog. The vvp target generates code for the vvp runtime. For example, if a scalar wire X is used but not declared in the Verilog source, this will print a warning at its first use.

It is useful for checking the syntax of the Verilog source. The command file allows the user to place source file names and certain command line switches into a text file instead of on a long command line. iczrus

Other target types are added as code generators are implemented. It may be necessary to disable extended types if compiling code that clashes with the few new keywords used to implement the type system.

What Is Icarus Verilog? Preserved for backwards compatibility.

Although both sections are written in prose with examples, the second section is more detailed and presumes the basic understanding of the first part. When disabled, specify blocks are parsed icarrus ignored. This is the user guide: The standard requires that if any input to a continuous assignment expression changes value, the entire expression is re-evaluated.


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See the wiki for more information. Add suffix to the list of accepted file icarux suffixes used when searching a library for cells. Turn on verbose messages.

The following types are supported: It can be found here. This is the default. A simple file name or file path is taken to be the name of a Verilog source file. This enables warnings for inconsistent use of the timescale directive.

This extra verbosity can be avoided by using the vvp command to indirectly execute icaeus compiler output file.

These flags specify an input file that contains a list of Verilog source files. The missing module name in a lookup need not match the file name case, as long as verilpg letters are correct. The Icarus Verilog fpga code generator can generate complete designs or EDIF macros that can in turn be imported into larger designs by other tools.

If no output file name is specified, iverilog uses the default name a. Retrieved from ” http: I’ll be adding a credits page someday, although the source distributions do in general name names. The path starts with the first non-white-space character. Variable values come from the operating system environment, and not from preprocessor defines elsewhere in the file or the command line.

Assign a value to a target specific flag. This standard include directory is a convenient place to install standard header files that a Verilog program may include. This is useful, for example, to preprocess Verilog source for use by other compilers.

The system module is implicit and always included. There is also a cast of characters who have contributed patches, tests, and various bits to the project. 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.


Access the git repository of Icarus Verilog with the commands: From here, you can use normal git commmands to update your source to the very latest copy of the source. This enables warnings for constant out of bound selects. Write into the file specified by path a list of files that contribute to the compilation of the design.

If it finds such a file, it loads it as a Verilog source file, they tries again to elaborate the module. 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. Where is Icarus Verilog?

iverilog • help

This enables warnings for ports of module instantiations that are not connected but probably should be. This enables warnings for kcarus statements that may have runtime infinite loops has paths with no or zero delay.

This is another way to specify library directories. Preprocess the Verilog source, gerilog do not compile it. By default any mismatch is reported as a error.

The iverilog program uses external programs and configuration files to preprocess and compile the Verilog source. The entire string is replaced with the contents of that variable. By default, parts of the expression that do not depend on the changed input value s are not re-evaluated.