Data Sheet

PCB Layout
119
Keepout Areas
We can also introduce tracking constraints by limiting areas in which tracks can be placed. A
good example of this is the crystal towards the bottom left of the layout where we do not want
tracks under this area. To form a keepout area, start by selecting the 2D Box graphic icon and
changing the layer selector to be keepout.
Selecting the Keepout layer
Next, place a small box around the silkscreen of the crystal in exactly the same way as we did
for the board edge (left click to start placement, drag out the area, left click again to commit
placement).
Keepout placed produces 2 DRC errors
Unless you are very skillful you will be presented with a box indicating that design rules have
been detected.