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<section id="vvp-command-line-flags">
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<h1>VVP Command Line Flags<a class="headerlink" href="#vvp-command-line-flags" title="Link to this heading">¶</a></h1>
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||
<p>The vvp command is the simulation run-time engine. The command line for vvp
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||
execution is first the options and flags, then the vvp input file, and finally
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||
extended arguments. Typical usage looks like this:</p>
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<div class="highlight-none notranslate"><div class="highlight"><pre><span></span><span data-line="1">% vvp <flags> foo.vvp <extended arguments>
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</span></pre></div>
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</div>
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<section id="options-flags">
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||
<h2>Options/Flags<a class="headerlink" href="#options-flags" title="Link to this heading">¶</a></h2>
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||
<p>These options/flags go before the path to the vvp-executable program. They
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||
effect behavior of the vvp runtime engine, including preparation for
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||
simulation.</p>
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||
<ul>
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||
<li><p>-i</p>
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||
<p>This flag causes all output to <stdout> to be unbuffered.</p>
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||
</li>
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||
<li><p>-l<logfile></p>
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||
<p>This flag specifies a logfile where all MCI <stdlog> output goes. Specify
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logfile as ‘-’ to send log output to <stderr>. $display and friends send
|
||
their output both to <stdout> and <stdlog>.</p>
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</li>
|
||
<li><p>-M<path></p>
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||
<p>Add the directory path to the (VPI) module search path. Multiple “-M” flags
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||
are allowed, and the directories are added in the order that they are given
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||
on the command line.</p>
|
||
<p>The string “-M-” is special, in that it doesn’t add a directory to the
|
||
path. It instead <em>removes</em> the compiled directory. This is generally used
|
||
only for development of the vvp engine.</p>
|
||
</li>
|
||
<li><p>-m<module></p>
|
||
<p>Name a VPI module that should be loaded. The vvp engine looks for the named
|
||
module in the module search path, which includes the compiled in default
|
||
directory and directories given by “-M” flags.</p>
|
||
<p>NOTE: Starting with v11.0, the VPI modules to be loaded can be specified
|
||
when you compile your design. This allows the compiler to automatically
|
||
determine the return types of user-defined system functions. If specified at
|
||
compile-time, there is no need to specify them again here.</p>
|
||
</li>
|
||
<li><p>-n</p>
|
||
<p>This flag makes $stop or a <Control-C> a synonym for $finish. It can be
|
||
used to give the program a more meaningful interface when running in a
|
||
non-interactive environment.</p>
|
||
</li>
|
||
<li><p>-N</p>
|
||
<p>This flag does the same thing as “-n”, but results in an exit code of 1
|
||
if the stimulation calls $stop. It can be used to indicate a simulation
|
||
failure when running a testbench.</p>
|
||
</li>
|
||
<li><p>-q</p>
|
||
<p>Enable quiet mode. This suppresses all output to <stdout> sent via MCD
|
||
bit 0 (e.g. all output from $display and friends). It does not affect
|
||
output to the log file, nor does it affect output to <stdout> sent via
|
||
the STDOUT file descriptor.</p>
|
||
</li>
|
||
<li><p>-s</p>
|
||
<p>$stop right away, in the beginning of the simulation. This kicks the
|
||
vvp program into interactive debug mode.</p>
|
||
</li>
|
||
<li><p>-v</p>
|
||
<p>Show verbose progress while setting up or cleaning up the runtime
|
||
engine. This also displays some performance information.</p>
|
||
</li>
|
||
<li><p>-V</p>
|
||
<p>Print the version of the runtime, and exit.</p>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section id="extended-arguments">
|
||
<h2>Extended Arguments<a class="headerlink" href="#extended-arguments" title="Link to this heading">¶</a></h2>
|
||
<p>The extended arguments are available to the simulation runtime, especially
|
||
system tasks, system functions and any VPI/PLI code. Extended arguments that
|
||
start with a “+” character are left for use by the user via the $plus$flag and
|
||
$plus$value functions.</p>
|
||
<p>NOTE: The extended arguments must appear <em>after</em> the input file name on the
|
||
command line.</p>
|
||
<section id="vcd-fst-lxt-arguments">
|
||
<h3>VCD/FST/LXT Arguments<a class="headerlink" href="#vcd-fst-lxt-arguments" title="Link to this heading">¶</a></h3>
|
||
<p>If not otherwise specified, the vvp engine will by default use VCD formats to
|
||
support the $dumpvars system task. The flags described here can alter that
|
||
behavior.</p>
|
||
<ul>
|
||
<li><p>-none/-vcd-none/-vcd-off/-fst-none</p>
|
||
<p>Disable trace output. The trace output will be stubbed so that no trace file
|
||
is created and the cost of dumping is avoided. All off these options are
|
||
synonyms for turning of dumping.</p>
|
||
</li>
|
||
<li><p>-fst</p>
|
||
<p>Generate FST format outputs instead of VCD format waveform dumps. This is
|
||
the preferred output format if using GTKWave or Surfer for viewing waveforms.</p>
|
||
</li>
|
||
<li><p>-lxt/-lxt2</p>
|
||
<p>Generate LXT or LXT2format instead of VCD format waveform dumps. The LXT2
|
||
format is more advanced.</p>
|
||
</li>
|
||
<li><p>-dumpfile=<name></p>
|
||
<p>Set the default dumpfile. If unspecified, the default is “dump”. This
|
||
command line flag allows you do change it. If no suffix is specified,
|
||
then the suffix will be chosen based on the dump type. In any case, the
|
||
$dumpfile system task overrides this flag.</p>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section id="sdf-support">
|
||
<h3>SDF Support<a class="headerlink" href="#sdf-support" title="Link to this heading">¶</a></h3>
|
||
<p>The Icarus Verilog support for SDF back-annotation can take some extended
|
||
arguments to control aspects of SDF support.</p>
|
||
<ul>
|
||
<li><p>-sdf-warn</p>
|
||
<p>Print warnings during load of/annotation from an SDF file.</p>
|
||
</li>
|
||
<li><p>-sdf-info</p>
|
||
<p>Print interesting information about an SDF file while parsing it.</p>
|
||
</li>
|
||
<li><p>-sdf-verbose</p>
|
||
<p>Print warnings and info messages.</p>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
</section>
|
||
<section id="environment-variables">
|
||
<h2>Environment Variables<a class="headerlink" href="#environment-variables" title="Link to this heading">¶</a></h2>
|
||
<p>The vvp program pays attention to certain environment variables.</p>
|
||
<ul class="simple">
|
||
<li><p>IVERILOG_DUMPER</p></li>
|
||
</ul>
|
||
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