[PCB_FORUM] Re: Why would auto router create L-L DRCs?

The router will make several passes, with the first pass usually having the 
most violations.  It will then progressively tidy them.  That's just the way it 
works.
 
If you use a .do file to control the router, you can tell it to put a penalty 
on crossing ( 0 MIL L-L) violations as opposed to spacing violations.  An 
example would be:
 
tax cross 5
tax squeeze 1
 
This then tells the router to favour L-L spacing violations as opposed to 
direct crossings.

>>> gcarman@xxxxxxxxxxxxxxx 22/12/2005 12:04 p.m. >>>

This is pretty fundamental...  as a designer you wouldn't cross two different 
nets with a short and expect to "get away with it." Why is the autorouter 
making this choice.  The constraint is set, yet the autorouter is violating it. 
 Very odd.  

CONSTRAINT:      Line to Line Spacing
  CONSTRAINT SET:  DEFAULT
  CONSTRAINT TYPE: NET SPACING CONSTRAINTS
    Constraint value: 4 MIL
    Actual value:     0 MIL

BTW I am selectively autorouting nets by selection. 

But the whole issue to me is that the autorouter is making shorts, and that 
just does not make sense.
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