User Guide

Electrical Rule Check (ERC): EAGLE can identify the violation of cer
-
tain electrical rules (e.g. if two outputs are connected) with the ERC. It
alsocheckstheconsistencyoftheschematicandthelayout.
Forward&Back Annotation: Transforms all the actions one makes in a
schematic online into the layout (and with limitations from layout into
schematic).Bothfilesareconsistentallthetime.
Gate: The term gate is used in this manual for a part of a component
which can be individually placed on a schematic. This can be one gate of
a TTL component, one contact pair in a relay, or an individual resistor
fromaresistorarray.
Hole: Nonplated-throughdrillinginthelayout(e.g.amountinghole).
Net: Electricalconnectioninaschematic.
Package: Componentfootprintstoredinalibrary.
Pad: Through-holepadassociatedwithapackage.
Pin: Connectionpointonaschematicsymbol.
Rack: Configuration table for a drilling machine. Needed for generating
drilldata.
Ratsnest: Commandforcalculatingtheshortestairwires.
Restring: Remaining width of the copper ring around a plated-through
padorvia.
Signal: Electricalconnectioninaboard.
Supply Symbol: Represents a supply signal in the schematic. Causes the
ERCtorunspecialchecks.
Symbol: Schematicrepresentationofacomponent,storedinalibrary.
User Language: Freely programmable, C-like language for data import
andexport.
Via: Plated-throughholeforchangingthelayerofatrack.
Wheel: Aperture configuration file. Generated with Gerber data for
boardmanufacturing.
Wire: Electrical connection in a board, or a line (since lines are drawn
withtheWIREcommand).
13
Introduction