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I'll be adding a credits page someday, although the source distributions do in general name names. 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. Search this site. Notable Links. Support Providers. 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. Where is Icarus Verilog? Hap Hazard. Fallen Earth. NyxQuest - Kindred Spirits. Icarus - Uses List Analyzer for Delphi. Runaway Express Mystery. Guns of Icarus. How to install custom themes on Windows How to easily reinstall Windows When this is done, the attribute is given to every instantiation of the primitive.

The semicolon is not part of a type attribute. Note that attributes are also occasionally used for communication between processing steps. Processing steps that are aware of others may place attributes on netlist objects to communicate information to later steps.

Icarus Verilog also accepts the Verilog syntax for attributes. Also, the key is a Verilog identifier instead of a string. This program invokes the preprocessor ivlpp and the compiler ivl with the proper command line options to get the job done in a friendly way. See the iverilog 1 man page for usage details. To compile the program: iverilog hello. To run the program:. See the iverilog 1 man page. Below is a description of some of the currently unsupported Verilog features.

This list is not exhaustive and does not account for errors in the compiler. See the Icarus Verilog web page for the current state of support for Verilog, and in particular, browse the bug report database for reported unsupported constructs.

See the "extensions. This is mostly of use for compiler regression tests. The result of this function is undefined if the argument doesn't have a self-determined size. This function is added for regression testing of the compiler and run time, but can be used by applications who really want the simulation time.

It is not in general possible to predict what the simulation precision will turn out to be. Builtin system functions Certain of the system functions have well-defined meanings, so can theoretically be evaluated at compile-time, instead of using runtime VPI code.

Doing so means that VPI cannot override the definitions of functions handled in this manner. On the other hand, this makes them synthesizable, and also allows for more aggressive constant propagation. Preprocessing Library Modules Icarus Verilog does preprocess modules that are loaded from libraries via the -y mechanism. However, the only macros defined during the compilation of that file are those that it defines itself or includes or that are defined in the command line or command file.

Specifically, macros defined in the non-library source files are not remembered when the library module is loaded. This is intentional. If it were otherwise, then compilation results might vary depending on the order that libraries are loaded, and that is too unpredictable. It is said that some commercial compilers do allow macro definitions to span library modules. That's just plain weird. Icarus Verilog allows the programmer to specify the field width.

However, if the programmer chooses to specify a minimum width i. This is useful in cases where one wants to iterate over all the objects in a scope without iterating over all the contained types explicitly. Combinational logic is routinely modelled using always blocks. However, this can lead to race conditions if the inputs to the combinational block are initialized in initial statements.

Icarus Verilog slightly modifies time 0 scheduling by arranging for always statements with ANYEDGE sensitivity lists to be scheduled before any other threads. This causes combinational always blocks to be triggered when the values in the sensitivity list are initialized by initial threads.