User Guide

Maximumnumberof...
mnVias=20...Viasperconnection
mnSegments=9999...Wiresegmentsperconnection
mnExtdSteps=9999...Steps45deg.againstpreferreddirection
mnRipupLevel=100...Ripupsperconnection
mnRipupSteps=300...Ripupsequencesperconnection
mnRipupTotal=200...Ripupsatthesametime
Trackparametersfor...
tpViaShape=Round...Viashape(roundoroctagon)
PrefDir.1=|Preferreddirectioninthegivenlayer
PrefDir.2=0Symbols:0-/|\*
...0:Layernotusedforrouting
PrefDir.15=0*:Nopreferreddirection
PrefDir.16=--:Xispreferreddirection
|:Yispreferreddirection
/:45deg.ispreferreddirection
\:135deg.ispreferreddirection
7.12 PracticalTips
This section presents you with some tips that have, over a period of
time,beenfoundusefulwhenworkingwiththeAutorouter.
Look on these examples as signposts suggesting ways in which a board
canberouted.Noneofthesesuggestionsguaranteesuccess.
General
The layer costs (cfLayer) should increase from the outer to the inner
layers or be the same for all layers. It is unfavorable to use lower values
in the inner layers than in the outer layers. This could increase the nee
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dedroutingmemoryenormously.
TheAutoroutercan'tlayoutwiresasarcs.
TheAutoroutercan’tsetmicrovias!
Single-SidedBoards
Therearetwoprocedures,dependingonthekindoflayout:
In the simplest case, only layer 16, Bottom, is active. No preferred direc
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tionisdefined.SelectasuitablegridandruntheAutorouter.
If the layout is rather more complex, it may be possible to achieve a us
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able result with special parameter settings. Please take a look at the pro
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ject named singlesided, which can be found in the eagle/projects/examples
directory. This example project comes with various control files (*.ctl),
which areoptimizedforsinglesidedrouting.
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EAGLEManual