GHDL

GHDL

Infobox software
name = GHDL



caption = GHDL, operated via the command line
developer = Tristan Gingold
latest_release_version = 0.27
latest_release_date = 21 July 2008
operating_system = Linux, Microsoft Windows
genre = Compiler, Simulator
license = GNU General Public License
website = http://ghdl.free.fr/

GHDL is a complete free software simulator for VHDL using GCC technology. The VHDL language is implemented according to the IEEE 1076-1987 or the IEEE 1076-1993 standard. It works by compiling VHDL files into a binary which simulates (or executes) the design. Some have already reported GHDL has (in a few cases) better implementation of standards than some commercial simulators. However, GHDL does not do synthesis and it cannot translate a design into a netlist.

Features

* GHDL implements the VHDL87 (common name for IEEE 1076-1987) standard, the VHDL93 standard (aka IEEE 1076-1993) and the protected types of VHDL00 (aka IEEE 1076a or IEEE 1076-2000). GHDL can also implement non-standard third party libraries such as those provided by Synopsys and Mentor Graphics, but this is discouraged [http://ghdl.free.fr/ghdl/IEEE-library-pitfalls.html#IEEE-library-pitfalls] .
* GHDL directly creates binaries or executable images, which is considered the best form for testbenches (autonomous self-checking VHDL designs which use assert). These binaries can also create a VCD file or a GHW file, which may be visually inspected with a waveform viewer such as GTKWave.
* GHDL can also be used to pretty print or to generate cross references in HTML.
* GHDL can generate a Makefile for any component in a design.

Shortcomings

* GHDL is only officially available on Linux and Microsoft Windows systems, but some have had success compiling GHDL on Solaris Sparc and Mac OS X.
* Overflow detection is not yet implemented.
* Some constraint checks are missing.
* VHDL-93 is not completely implemented.
* Partial support of VHDL-02.
* There are no checks for elaboration order.

External links

* [http://ghdl.free.fr/ Project home page]


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