Tutorial EAGLE 4.1 -- 2nd edition - Cadsoft

EAGLE-Tutorial Version 4.1
appropriate nets.
The help function in EAGLE offers information about further options of
the commands ADD and UPDATE concerning the update of library objects
in schematic and layout with their respective parts of the current
libraries.
The USE Command
The default setting causes the ADD command to search in all libraries that
are available in the given libraries directories (⇒ Options/Directories/Libraries
in the Control Panel). You can exclude libraries from the search
function by clicking the green marker in the Control Panel's tree view, Libraries
branch. Green means in use, gray not used. This is exactly the function
of the USE command you can also type on the command line.
For example, the command
USE *
makes available all libraries that can be found in the given library paths.
More about this can be found in the help function.
The INVOKE Command
The INVOKE command can be used to allow the connection of active
components to a power source other than VCC and GND. To demonstrate
its use
• INVOKE
and left click on the gate IC2A. A popup menu appears.
• • PWRN and the power pins for IC2 are attached to the cursor. You can
now place them anywhere with a • and connect them to any net.
Another feature of the INVOKE command allows you to alter the sequence
of the reference designators before EAGLE automatically makes an
assignment. Assuming the INVOKE command is still active, • IC2A, and
the popup menu appears. The asterisk assigned to gate A indicates that the
gate has been used; those without an asterisk are available for use.
If you want IC2C to be placed before IC2B, • • C in the popup menu. The
menu closes, and IC2C is attached to the cursor to be placed with a •.
Once IC2C is placed, EAGLE will use up the remaining gates in that package
before assigning an additional package.
If you want to place gates over more than one sheet, use the INVOKE
command on the new sheet and type in the element's name in the command
line. Now the invoke menu pops up.
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