User Guide

Now switch off the bus router and all the optimization passes in the Au
-
torouter setup. Only the routing remains active. Alter the following
costfactors:
cfVia=0Viasarewanted
mnVia=1Max.1viaperconnection
cfBase.1/16=30..99Shorttracks
inTop/Bottom
mnSegments=2..8shorttracks
Start the Autorouter, using the Select button, and choose the signals to
be routed. After the routing pass it is possible, if appropriate, to opti
-
mizetheresultmanually.
The rest of the connections are routed after this. Use AUTO to open
the Autorouter setup menu, and load the previous stored control pa
-
rameters with the Load.. button (standard.ctl). Adjust the values to any
specialwishesyoumayhave,andstarttheAutorouter.
This procedure is identical for both types of supply layer (automatically
generatedsupplylayer,orasupplylayergeneratedwithpolygons).
Whatcanbedoneifnotallsignalsarerouted?
Ifthishappens,checkyoursettings.
•
Hasasufficientlyfineroutinggridbeenselected?
•
Havethetrackwidthsgotappropriatedimensions?
•
Cantheviashavesmallerdiameters?
•
Havetheminimumclearancesbeenoptimallychosen?
If it is either impossible or unreasonable to optimize these values any
further, an attempt to achieve a higher level of routing may be made by
increasing the ripup level. Observe the notes in the section on the Num
-
berofRipup/RetryAttempts onpage 127.
135
TheAutorouter