Data Sheet

LABCENTER ELECTRONICS LTD.
138
Everything will happen quite quickly from this point onwards but you should see routing
progress on the status bar as the engine works towards completion. Once the board is complete
there are two immediate points of note:
The auto-router has preserved those tracks that we placed manually and has not ripped
and replaced them whilst working on the rest of the board.
Once the autorouter has completed a final pass is made to corner the tracks. If you prefer
this not to happen you can remove the Recorner Pass option on the dialogue form before
invoking the router
Set the Recorner Pass to be NO
Length Matching Routes
Automatic length matching is part of the advanced feature set and requires PCB
Design Level 2 or higher.
For high speed signal lines it is common to need to match the lengths of the tracks to ensure
that all relevant signals arrive inside the sample and hold time of the receiving chip. While not
required for the tutorial design we now have a fully routed board so it is a good opportunity to
explain how the feature would be used. The first step is to select the tracks that you wish to
length match by holding the CTRL button down and left clicking on each track. We've chosen to
do this with two large routes into U1 as shown here: