Changes and defines layers.

LAYER layer_number
LAYER layer_name
LAYER layer_number layer_name
LAYER [??] -layer_number

See also DISPLAY

Choose Drawing Layer

The LAYER command with one parameter is used to change the current layer, i.e. the layer onto which wires, circles etc. will be drawn. If LAYER is selected from the menu, a popup menu will appear in which you may change to the desired layer. If entered from the command line, 'layer_number' may be the number of any valid layer, and 'layer_name' may be the name of a layer as displayed in the popup menu.

Certain layers are not available in all modes.

Please note that only those signal layers (1 through 16) are available that have been entered into the layer setup in the Design Rules.

Define Layers

The LAYER command with two parameters is used to define a new layer or to rename an existing one. If you type in at the command prompt e.g.

you define a new layer with layer number 101 and layer name SAMPLE.

If a package contains layers not yet specified in the board, these layers are added to the board as soon as you place the package into the board (ADD or REPLACE).

The predefined layers have a special function. You can change their names, but their functions (related with their number) remain the same.

If you define your own layers, you should use only numbers greater than 100. Numbers below may be assigned for special purposes in later EAGLE versions.

Delete Layers

The LAYER command with the minus sign and a layer_number deletes the layer with the specified number, e.g.

LAYER -103;
deletes the layer number 103. Layers to be deleted must be empty. If this is not the case, the program generates the error message

"layer is not empty: #"

where "#" represents the layer number. If you want to avoid any error messages in a layer delete operation you can use the '??' option. This may be useful in scripts that try to delete certain layers, but don't consider it an error if any of these layers is not empty or not present at all.

The predefined standard layers cannot be deleted.

Supply Layers

Layers 2...15 are treated as supply layers if their name starts with the '$' character and there is a signal with an identical name but without the leading '$'.

Any pads or vias belonging to that signal are implicitly considered connected by the RATSNEST command and the Autorouter.

Supply layers are viewed "inverted", which means that any objects visible on such a layer will result in "copper free" areas on the board. The program automatically generates Thermal and Annulus objects to connect and isolate pads and vias to/from these layers.

You should not draw any additional objects into a supply layer, except, for instance, wires along the outlines of the board, which prevent the copper area from extending to the very edges and thus possibly causing short circuits through a metal casing or mounting screw. Note that there are no checks whether a supply layer really connects all pads and vias. If e. g. a user drawn object isolates a pad that should be connected to the supply layer, there will be no airwire generated for that (missing) connection. The same applies if several Annulus symbols form a "ring" around a Thermal symbol (and would thus completely isolate that pad from its signal). Also note that the size of the annulus symbols used in a supply layer is only derived from the value given under "Annulus" in the "Supply" tab of the Design Rules, and that neither the minimum distances under "Clearance" nor those in the net classes go into this calculation.

For a safer and more flexible way of implementing supply layers you should use the POLYGON command.

Predefined EAGLE Layers


1 Top Tracks, top side
2 Route2 Inner layer (signal or supply)
3 Route3 Inner layer (signal or supply)
4 Route4 Inner layer (signal or supply)
5 Route5 Inner layer (signal or supply)
6 Route6 Inner layer (signal or supply)
7 Route7 Inner layer (signal or supply)
8 Route8 Inner layer (signal or supply)
9 Route9 Inner layer (signal or supply)
10 Route10 Inner layer (signal or supply)
11 Route11 Inner layer (signal or supply)
12 Route12 Inner layer (signal or supply)
13 Route13 Inner layer (signal or supply)
14 Route14 Inner layer (signal or supply)
15 Route15 Inner layer (signal or supply)
16 Bottom Tracks, bottom side
17 Pads Pads (through-hole)
18 Vias Vias (through-hole)
19 Unrouted Airwires (rubberbands)
20 Dimension Board outlines (circles for holes)
21 tPlace Silk screen, top side
22 bPlace Silk screen, bottom side
23 tOrigins Origins, top side
24 bOrigins Origins, bottom side
25 tNames Service print, top side
26 bNames Service print, bottom side
27 tValues Component VALUE, top side
28 bValues Component VALUE, bottom side
29 tStop Solder stop mask, top side
30 bStop Solder stop mask, bottom side
31 tCream Solder cream, top side
32 bCream Solder cream, bottom side
33 tFinish Finish, top side
34 bFinish Finish, bottom side
35 tGlue Glue mask, top side
36 bGlue Glue mask, bottom side
37 tTest Test and adjustment inf., top side
38 bTest Test and adjustment inf. bottom side
39 tKeepout Nogo areas for components, top side
40 bKeepout Nogo areas for components, bottom side
41 tRestrict Nogo areas for tracks, top side
42 bRestrict Nogo areas for tracks, bottom side
43 vRestrict Nogo areas for via-holes
44 Drills Conducting through-holes
45 Holes Non-conducting holes
46 Milling Milling
47 Measures Measures
48 Document General documentation
49 Reference Reference marks
51 tDocu Part documentation, top side
52 bDocu Part documentation, bottom side


91 Nets Nets
92 Busses Buses
93 Pins Connection points for component symbols
with additional information
94 Symbols Shapes of component symbols
95 Names Names of component symbols
96 Values Values/component types

Index Copyright © 2005 CadSoft Computer GmbH