User Guide

6.4 MultilayerBoards
You can develop multilayer boards with EAGLE. To do this, you use
one or more inner layers (Route2 to Route15) as well as the layers To p
and Bottom for the top and undersides. You display these layers when
routing.
SignalLayers
You use the ROUTE command as before to place tracks in those inner
layers which are provided for signals. Eagle will itself ensure that the
tracks are connected by way of plated-through holes to the appropriate
signalsintheouterlayers.
The CAM Processor will output the inner signal layers if the inner layer
concernedisactivatedtogetherwiththelayers17, Pads and18, Vias.
Power SupplyLayerwithOneSignal
A power supply layer with one signal is implemented by renaming one
of the Route2...15 layers in such a way that the new name consists of the
corresponding signal name prefixed by a $ sign. If, for example, the sig
-
nal called GND is to be realized as a power supply layer, then a layer is
specifiedashavingthename$GND.
For this purpose you activate the
DISPLAY command. You select layer 2
from the menu with the mouse. Then
clickonthe Change button.
Enter the signal name for the layer, and
activate the Supply layer checkbox. If the
layer is to be visible in the layout imme
-
diately, then click also on the Displayed
checkbox.
Thecommandcorrespondingtothisexamplewouldbe:
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