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       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

       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:

       -a     Analysis, i.e. ghdl -a file.vhdl

       -e     Elabortation, i.e. ghdl -e unit_name

       -r     Run: run the simulation, i.e. ghdl -r unit_name

       -s     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

              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

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

       --help Show options for simulation and execution.

              Assert     level     at     which     to     stop     simulation
              (none|note|warning|error|failure),     i.e.      ./touchy_design

              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


       gtkwave (1)

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


       This manual page was written by Wesley J. Landaker <>,
       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.

                                 Jun 24, 2006