User Guide

Isolate:
Defines the value that the polygon must maintain with respect to all
other elements not part of its signal. If higher values are defined for spe
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cialelementsintheDesignRulesornetclasses,thehighervaluesapply.
Thermals:
Determines whether pads in the polygon are connected via thermal
symbols, or are completely connected to the copper plane. This also ap
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plies to vias, assuming that the option has been activated in the Design
Rules.
The width of the thermal connectors is calculated as the half of the pad's
drill diameter. The width has to be in the limits of a minimum of the
wirewidthandamaximumoftwicethewirewidthofthepolygon.
Don't choose the polygon's width too fine, otherwise the thermal con
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nectors won't carry the current load. This is also true for bottlenecks in
thelayout.
Orphans:
Defines whether the polygon may contain areas which are not con
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nectedelectricallytopolygon'ssignalornot.
IfOrphansisset Off theywillbeeliminated.
When drawing a polygon, please take care to ensure that the outline is not
drawn more than once (overlapping) anywhere, and that the polygon out
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line does not cross over itself. It is not possible for EAGLE to compute the
contentsoftheareainthiscase.
An error message Signalname contains an invalid polygon! is issued, and
theRATSNESTcommandisaborted.
If this message appears, the outline of the polygon must be corrected. Other
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wise,manufacturingdatacannotbecreatedbytheCAMProcessor.
The CAM Processor automatically computes the polygons in the layout be
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foregeneratingitsoutput.
CheckingtheLayoutand CorrectingErrors
The Design Rule Check (DRC) is carried out at the end of the board
design, if not before. If you have not yet specified any Design Rules for
the layout, this is your last opportunity. See the section on Specifying the
DesignRules frompage 91.
If the DRC finds errors, an error window opens automatically. This lists
all the errors. The window can be opened at any time by means of the
ERRORScommand.
If an error in the list is selected, a line points to the corresponding loca
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tion. The error is marked. Correct the error in the layout. The DRC er
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rorwindowremainsintheforeground.
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EAGLEManual