User Guide

You can adjust the pin parameters (name, direction, function, length, visi
-
ble, swaplevel) while the PIN command is active, or with the CHANGE
command. The pin parameters are explained starting on page 162 and in
the help pages under the keyword PIN. Pin names are changed using the
NAMEcommand.
UsetheTEXTcommandtoplace
•
thestring>NAMEinlayer25, tNames,servingasatextvariable
containingthenameofthecomponent,
•
thestring>VALUEinlayer27, tValues,servingasatextvariable
containingthevalueofthecomponent.
DesignaNew SymbolfromanExistingOne
Load the existing symbol, display all layers, define a group (GROUP
command) containing all of the objects, click the CUT icon and then
theoriginofthedrawingarea(coordinates00).
You can also type the CUT command on the command line and give a
referencepoint,forexample:
CUT(00);
Open a new symbol (in the same or another library) for editing, click
thePASTEiconandthentheoriginofthedrawingarea.
Or enter again the PASTE command with a reference point in the com-
mandline,forexample:
PASTE(00);
Nowedittheobjectsinwhateverwayyouwant.
You can use the coordinate values for the CUT and PASTE commands
to move the group in the coordinate system. This may be useful for ob
-
jectsthatarenotdrawninthecorrectgrid.
GROUP, CUT, and PASTE can be used to copy Packages and Symbols,
butnottocopyDevices.
SeealsoEXPORTSCRIPTonpage 75.
The DeviceEditingmode
Components are defined as devices. In the device editing mode you do
notdrawanything,butyoudefinethefollowing:
•
whichpackagevariantisused,
•
whichsymbol(s)is/areused(calledgatewithinthedevice),
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whichnamesareprovidedforthegates(e.g.A,B),
•
whichtechnologiesareavailable(e.g.74L00,74LS00,74HCT00),
•
ifthereareequivalentgateswhichcanbeinterchanged
(swaplevel),
•
howthegatebehaveswhenaddedtoaschematic(addlevel),
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AFirstLookatEAGLE