User Guide

If there is no longer a wiring route available for some signals, other
tracks are relocated with MOVE and SPLIT, or the properties of tracks
(width,layer)aremodifiedwithCHANGE.
If a through-plated hole is to be placed at a certain point, this can be
done with the VIA command. The via is given the name of a signal using
NAME.
If you want to begin a wire of a partially routed signal at another posi
-
tion than the start or end point of an airwire (for example, at a farther
position on a wire that belongs to the same signal) simply press the Ctrl
key. EAGLE generates a new airwire from this position (see also help
functionforROUTE).
Airwires with length of 0 (for example, from To p to Bottom layer) are
drawnasacrossinlayer19, Unrouted.
Ending a wire at the same position where another wire of the same sig
-
nal but in another layer already exists and pressing the Shift key at the
sametimecausesEAGLEtoplaceavia.Otherwiseitwon't.
If you intend to design a multilayer board and use blind and buried or
micro vias, please note the details (also for the VIA command) in the
sectionabout MultilayerBoards beginningatpage 121.
While laying out wires EAGLE calculates the shortest connection to the
closest point of the current signal automatically. This connection is rep
-
resentedbyanairwire.
As the routing proceeds it is helpful to run the RATSNEST command
frequently,inordertorecalculate all theairwires.
Use RIPUP if you want to convert the whole or part of a track or a via
that has been laid back to a signal line. By clicking on a track it is decom
-
posed between the nearest bends. If you click on this location again (on
the airwire), the whole signal branch back to the nearest pads is decom
-
posed. If you want to undo the whole of the signal, click RIPUP and en
-
ter the name of the signal on the command line. More than one may be
enteredatthesametime.
Thecommand
RIPUPGNDVCC+5V
convertsthethreesignalsGND,VCCand+5Vbacktoairwires.
RIPUP!GNDVCC
on the other hand converts all signals apart from GND and VCC to
airwires.
RIPUP;
converts all signals (that are visible in the editor) into airwires. To truly
include every track, all the layers in which tracks have been drawn must
bevisible(DISPLAY).
114
EAGLEManual