User Guide

DRC
DefineDesignRulesandperformDesign RuleCheck.
ERRORS
ShowerrorsfoundbytheDRCandclearerrorpolygons.
4.4 The LibraryEditorWindow
The Library Editor window opens when you load a library for creating
or editing components. A library normally has three different elements:
packages,symbolsanddevices.
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Apackageisadevice’shousing,aswillbeusedintheLayoutEdi
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tor(ontheboard).
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Thesymbolcontainsthewayinwhichthedevicewillbeshownin
theschematic.
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Thedevicerepresentsthelinkbetweenone(ormore)symbol(s)
andapackage.Herewedefinetheconnectionbetweenapinofa
symbolandthereferringpadofthepackage.
Wecallitadevicesetifthecomponentexistsinmorethanone
packageand/ortechnologyvariant.
Even if you do not have the schematic module, you can still create and
editsymbolsanddevices.
A library need not contain only real components. Ground or supply
symbols as well as drawing frames can also be stored as devices in a li
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brary. These symbols do not normally contain any pins. There are also
librariesthatonlycontainpackages.
Extensive examples of the definition of library elements are to be found
in a section entitled Component Design Explained through Examples,
startingonpage 137 inthismanual.
Whenalibraryisloadedthefollowingwindowappearsfirst:
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EAGLEManual