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<html>
<head>
<title>EAGLE Help: CLASS</title>
</head>
<body bgcolor=white>
<font face=Helvetica,Arial>
<hr>
<i>EAGLE Help</i>
<h1><center>CLASS</center></h1>
<hr>
<dl>
<dt>
<b>Function</b>
<dd>
Define and use net classes.
<p>
<dt>
<b>Syntax</b>
<dd>
<tt>CLASS</tt><br>
<tt>CLASS number|name</tt><br>
<tt>CLASS number name [ width [ clearance [ drill ] ] ]</tt><br>
<p>
</dl>
<b>See also</b> <a href=127.htm>Design Rules</a>,
<a href=63.htm>NET</a>,
<a href=88.htm>SIGNAL</a>,
<a href=32.htm>CHANGE</a>
<p>
The CLASS command is used to define or use net classes.
<p>
Without parameters, it offers a dialog in which the net classes can be defined.
<p>
If only a <tt>number</tt> or <tt>name</tt> is given, the net class with the given
number or name is selected and will be used for subsequent NET and SIGNAL commands.
<p>
If both a <tt>number</tt> and a <tt>name</tt> are given, the net class with the
given number will be assigned all the following values and will also be used for
subsequent NET and SIGNAL commands. If any of the parameters following <tt>name</tt>
are omitted, the net class will keep its respective value.
<p>
If <tt>number</tt> is negative, the net class with the absolute value of <tt>number</tt>
will be cleared. The default net class <tt>0</tt> can't be cleared.
<p>
Net class names are handled case insensitive, so SUPPLY would be the same as Supply
or SuPpLy.
<p>
Using several net classes in a drawing increases the time the Design Rule Check
and Autorouter need to do their job. Therefore it makes sense to use only as few net
classes as necessary (only the number of net classes actually used by nets or
signals count here, not the number of defined net classes).
<p>
In order to avoid conflicts when CUT/PASTEing between drawings it makes sense
to define the same net classes under the same numbers in all drawings.
<p>
The Autorouter processes signals sorted by their total width requirements (Width
plus Clearance), starting with those that require the most space. The bus router
only routes signals with net class <tt>0</tt>.
<p>
The net class of an existing net/signal can be changed with the CHANGE command.
Any changes made by the CLASS command will not be stored in the UNDO/REDO buffer.
<hr>
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