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Why is a crosstalk table needed for a basic fast autoroute

When attempting to use the autoroute feature in Allegro PCB Editor (design.brd not design.dsn file). The router refuses to run unless a cross-talk simulation is run first.

I just want a simple x-y autoroute done using specific layers where layer 8 is the x direction and layer 10 is the Y direction (for example). I have over 4,000 connections to complete in 4 hours and it is too much for my mouse/fingers/brain to do manually. But the simulation is taking forever to run and will provide no useful help as there are no impedance requirements on the PCB!

So how can I run a simple Autoroute to remove the majority of the simple connections (I have already fanned out most of the connections manually)? Or does Allegro not allow for autorouting any more?

redwire over 4 years ago in reply to tmd63

The BRD gets converted to DSN for the autorouter. You can do it manually (File->Export...etc) or when you invoke the autorouter it generates the Specctra format DSN file from your BRD.

Sounds like you might need to tune up your autorouter knowledge before pushing go?
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