ghdl (1) - Linux Manuals

ghdl: VHDL compiler/simulator


ghdl - VHDL compiler/simulator


ghdl [command] [options] files...


This manual page documents briefly the ghdl command. This manual page was written for user of man, but is not as complete as the reference documentation.

Instead, users should read the GHDL texinfo manual


This program follows the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of the main modes and options is included below. For a complete description, refer to the GHDL texinfo manual.

Basic commands:

Analysis, i.e. ghdl -a file.vhdl
Elabortation, i.e. ghdl -e unit_name
Run: run the simulation, i.e. ghdl -r unit_name
Syntax-check, i.e. ghdl -s file.vhdl
Clean: remove generated files, i.e. ghdl --clean
-h, --help
Help, i.e. ghdl --help
Version, i.e. ghdl --version

Basic options:

Name of the WORK library, i.e. ghdl -a --work=foo foo.vhdl
Which VHDL standard (87|93|93c|00|02), i.e. ghdl -a --std=87 old.vhdl
Which IEEE library (none|standard|synopsys|mentor), i.e. ghdl -a --ieee=synopsys broken.vhdl
Disable VITAL restriction checking, i.e. ghdl -a --no-vital-checks unsupported_vital.vhdl

There are many more modes and options; please consult the documentation.

Executables created by GHDL have addition simulation options. The most important ones are listed below:

Show options for simulation and execution.
Assert level at which to stop simulation (none|note|warning|error|failure), i.e. ./touchy_design --assert-level=note
Stop simuation after TIME, i.e. ./design --stop-time=50ns
Dump VCD to FILENAME (a waveform dump, viewable with--for instance--gtkwave), i.e. ./design --vcd=design.vcd
Back annotate SDF onto design using TYPE (min|typ|max), instance PATH, and SDF file FILENAME, i.e. ./sdf_design --sdf=typ=top/inst=inst.sdf


This manual page was written by Wesley J. Landaker <wjl [at]>, for the Debian project (but may be used by others). It is released under the same terms as GHDL, i.e. the GNU General Public License. It was modified by Tristan Gingold to include it in the GHDL sources.


gtkwave (1)

The texinfo manual fully documents GHDL. You may also browse it at <>.