User Guide

Layer 51, tDocu, is not used to print onto the board itself, but is a sup
-
plement to the graphical presentation which might be used for printed
documentation. Care must be taken in layer 21, tPlace, not to cover any
areas that are to be soldered. A more realistic appearance can be given,
however, in the tDocu layer, which is not subject to this limitation. In
the example of the resistor, the symbol can be drawn in layer 21, tPlace,
butthewires,whichgooverthepads,aredrawninlayer51, tDocu.
ThePackageEditor
Labeling
With the TEXT command you place the texts >NAME (in layer 25,
tNames) and >VALUE (in layer 27, tValues) in those places where in
the board the actual name and the actual value are to appear. 0.07 inch
for the text height (size) and 10% for the ratio (relationship of stroke
width to text height, which can only be set, using CHANGE, for vector
fonts)arerecommended.
SMASH and MOVE can be used later to change the position of this text
relativetothepackagesymbolontheboard.
In the case of ICs, for instance, the value corresponds to what will later
bethedevicename(e.g. 74LS00).
When working with only the Layout Editor, the value is specified in the
board.
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EAGLEManual