<!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 sectionedit2150"><table class="inline"> <tr class="row0"> <td class="col0 leftalign"> « <a href="geda-gnetlist_ug-hierarchy.html" class="wikilink1" title="geda-gnetlist_ug-hierarchy.html">Hierarchy</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-implicit_pins.html" class="wikilink1" title="geda-gnetlist_ug-implicit_pins.html">Implicit pins</a> » </td> </tr> </table></div> <!-- EDIT2150 TABLE [1-103] --> <h2 class="sectionedit2151"><a name="slots_and_slotting" id="slots_and_slotting">Slots and slotting</a></h2> <div class="level2"> <p> Some integrated circuits provide several identical and interchangeable devices in a single package. The classic “4000” series of logic devices is a good example of this; for example, each 4001 package contains four 2-input NOR gates. <a href="geda-gschem_ug.html" class="wikilink1" title="geda-gschem_ug.html">gschem</a> and gnetlist provide support for working with these by using <em>slots</em>. </p> <p> <p><div class="notetip">Check the “4001-1.sym” symbol in the “4000-series logic” symbol library for an example of how to use slotting and <a href="geda-gnetlist_ug-implicit_pins.html" class="wikilink1" title="geda-gnetlist_ug-implicit_pins.html">implicit pins</a>. </p> <p> Detailed information on slotting attributes can be found in the <a href="geda-master_attributes_list.html" class="wikilink1" title="geda-master_attributes_list.html">Master Attributes List</a>. </div></p> </p> <p> gnetlist uses several symbol attributes to enable slotting. All must be present for gnetlist to process a slotted component correctly. </p> <ol> <li class="level1"><div class="li"> Every pin must have a ”<code>pinseq=</code>” attribute and a ”<code>pinnumber=</code>” attribute.</div> </li> <li class="level1"><div class="li"> The ”<code>numslots=</code>” attribute indicates how many slots a component has.</div> </li> <li class="level1"><div class="li"> There must be one ”<code>slotdef=</code>” attribute for each slot. This contains information about the pin numbers of the pins associated with each slot.</div> </li> <li class="level1"><div class="li"> A ”<code>slot=</code>” attribute attached to each component in the schematic indicates which particular slot to use.</div> </li> </ol> <p> When processing a slotted component, gnetlist first looks for a ”<code>slotdef=</code>” attribute matching the value of the ”<code>slot=</code>” attribute. It uses the value of the ”<code>slotdef=</code>” attribute to renumber the pins for the correct slot. It then merges the component with other components with the same “refdes”. </p> <p> <p><div class="noteimportant">gnetlist does not currently support slotting across hierarchy. The slots in a package cannot be split between different subcircuits. </div></p> </p> </div> <!-- EDIT2151 SECTION "Slots and slotting" [105-] --></body> </html>
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