Wow!
Interesting responses to a question with not many details...
Quite amazing how people from two different design worlds see the question 
in a totally different way.  I don't even use vias in a single-sided pcb, and the 
autorouter is not too hot with ss pcbs anyway - unless plenty of room.  I 
guess it would depend on what Raybo's background is as to what is easiest 
to do.  I would concentrate on arranging components as a real priority - then 
layout of tracks (manually routing is my preference here, but may not be 
realistic for the design).  
Liane.

> 
> Use the design rules to give priority to the bottom layer by an 
> excessive amount. Also set the via size to an excessive amount. 
> They will become the pads for your links, but you want them larger 
> than that so that it discourages the router from using them.
> Under the signal integrity rules is one to limit the length of traces so
> you may be able to use that on the top layer to get fixed length links.
> Let the autorouter rip. Examine the result and move parts around to
> improve the result. It won't be ideal but it is much easier to take a
> routed board and reroute tracks to get the desired result.
> 
> Once done, globally change the vias to the required size and select 
> all tracks on the top layer and copy them to Top Overlay. Don't plot the
> top layer but keep the tracks there to maintain integrity with the
> schematic.
> 
> Steve.
> 
> ======================================================
> Steve Baldwin                Electronic Product Design
> TLA Microsystems Ltd         Microcontroller Specialists
> PO Box 15-680, New Lynn      http://www.tla.co.nz
> Auckland, New Zealand        ph  +64 9 820-2221
> email: [EMAIL PROTECTED]      fax +64 9 820-1929
> ======================================================


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