User Guide

Textvariablesinthedocumentationfield
The text variables >DRAWING_NAME, >LAST_DATE_TIME and
>SHEET are contained, as well as some fixed text. The drawing’s file
name, date and time of the last change appear at these points together
withthesheetnumberintheschematic(e.g., 2/3 =sheet2of3).
In addition, the variable >PLOT_DATE_TIME is available. It contains
thedateandtimeofthelastprintout.
All of these text variables can be placed on the schematic, and (with the
exceptionof >SHEET)ontheboard.
The frame is defined in the device with addlevel Next, and the documen
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tation field with addlevel Must. This means that the documentation field
cannotbedeletedaslongastheframeispresent.
8.9 ComponentsontheSolderSide
SMD components (and leaded ones too) can be placed on the top or
bottom layers of a board. For this reason EAGLE makes a set of prede
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fined layers available which are related to the top side (To p , tPlace, tOri
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gins, tNames, tValues etc.) and another set of layers related to the
bottomside(Bottom, bPlace etc.).
SMD components are always defined in the layers associated with the
top. In the board, a component of this sort is moved to the opposite
side with the MIRROR command. This causes objects in the Top layer
tobereflectedintotheBottomlayer,whilealltheelementsinthe
t.. layersarereflectedintothecorresponding b.. layers.
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EAGLEManual