<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title></title> <link rel="stylesheet" media="screen" type="text/css" href="./style.css" /> <link rel="stylesheet" media="screen" type="text/css" href="./design.css" /> <link rel="stylesheet" media="print" type="text/css" href="./print.css" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body> <div class="table sectionedit2172"><table class="inline"> <tr class="row0"> <td class="col0 leftalign"> « <a href="geda-gnetlist_ug-input_output_files.html" class="wikilink1" title="geda-gnetlist_ug-input_output_files.html">Input & output files</a> </td><td class="col1 centeralign"> <strong><a href="geda-gnetlist_ug.html" class="wikilink1" title="geda-gnetlist_ug.html">gEDA gnetlist User Guide</a></strong> </td><td class="col2 rightalign"> <a href="geda-gnetlist_ug-basic_netlisting.html" class="wikilink1" title="geda-gnetlist_ug-basic_netlisting.html">Basic netlisting</a> » </td> </tr> </table></div> <!-- EDIT2172 TABLE [1-187] --> <h2 class="sectionedit2173"><a name="netlist_backends" id="netlist_backends">Netlist backends</a></h2> <div class="level2"> <p> Normally, gnetlist generates a netlist in two steps. </p> <ol> <li class="level1"><div class="li"> The gnetlist frontend uses the human-readable schematic files to construct an intermediate form of the design.</div> </li> <li class="level1"><div class="li"> A <em>netlist backend</em> is used to extract information from the intermediate form and write it out to disk.</div> </li> </ol> <p> Most backends are used to write out electrical connectivity information in a machine-readable format for use by other tools. For example, the “liquidpcb” backend is used to generate a netlist to use when designing a circuit board with <a href="http://www.liquidpcb.org/" class="urlextern" title="http://www.liquidpcb.org/" rel="nofollow">LiquidPCB</a>, and the “spice-sdb” backend is often used to create netlists for use with the SPICE simulator. </p> <p> Backends may have other uses, however. For example, the “bom2” backend is used for generating a list of components used (a “Bill of Materials”), and the “drc2” backend carries out “design rule checking” (i.e. checking a design for commonly-made errors and potential problems). </p> <p> A summary of all the netlist backends distributed with gnetlist is provided in the gnetlist manpage (which you can view by running <code>man gnetlist</code>). </p> <p> <p><div class="notetip">If none of the distributed backends do what you need, you can write and install your own! For more information, see the <a href="geda-gnetlist_scheme_tutorial.html" class="wikilink1" title="geda-gnetlist_scheme_tutorial.html">Scripting a gnetlist backend in Scheme</a> tutorial. </div></p> </p> </div> <!-- EDIT2173 SECTION "Netlist backends" [189-1522] --> <h3 class="sectionedit2174"><a name="specifying_a_backend" id="specifying_a_backend">Specifying a backend</a></h3> <div class="level3"> <p> Use the <code>-g</code> option to indicate which backend you would like gnetlist to run. For example, to run the “bom2” backend: </p> <pre class="code">gnetlist -g bom2</pre> </div> <!-- EDIT2174 SECTION "Specifying a backend" [1523-1709] --> <h3 class="sectionedit2175"><a name="listing_backends" id="listing_backends">Listing backends</a></h3> <div class="level3"> <p> To view a list of installed backends, use the <code>--list-backends</code> command-line option: </p> <pre class="code">gnetlist --list-backends</pre> <p> This will print a list of all the backends that gnetlist can find. </p> </div> <!-- EDIT2175 SECTION "Listing backends" [1710-1938] --> <h3 class="sectionedit2176"><a name="interactive_mode" id="interactive_mode">Interactive mode</a></h3> <div class="level3"> <p> An alternative to running a backend is to use <em>interactive mode</em>. When the <code>-i</code> option is used, gnetlist creates the intermediate form from the schematic files, and then enters a Scheme REPL (Read-Eval-Print Loop). This allows you to run Scheme commands and inspect the output, which can be useful for troubleshooting and to enable some advanced netlist processing techniques. </p> </div> <!-- EDIT2176 SECTION "Interactive mode" [1939-] --></body> </html>
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