Jon's point was that you'll need to do this in 2 passes.  First, set grid &
rules that will optimize your via placement, and run the autorouter with
ONLY "Fan out used SMD pins" checked -- clear all the other pass
check-boxes.  See how the vias look, maybe adjust rules/grid.  You might try
a specific via-to-via clearance rule.  Once you have the vias looking good
(and maybe adjust manually, too!), make a backup copy of your PCB, then
change your grid/rules for track spacing, and run the autorouter will all
the other passes checked, making sure you have "Lock all preroutes" checked.

-----Original Message-----
From: Shuping Lew [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 15, 2002 2:15 PM
To: Protel EDA Forum
Subject: Re: [PEDA] Fan out Via clearance


Jon, Thank you very much for your replied.

Could you describe some more details? ---How to set up different grids
for Vias and traces? Grid setting for traces should be much smaller than
Via's... I'd like to set up 5mil for traces and 55 mil for vias so I can
run a trace in between. Is there any way to set up different grids for
auto router?

I sent a email to Protel here is the answer...

Thank you for contacting Protel technical support regarding your issue.

Unfortunately there is no rule that will allow you to have one trace go
in
between fan out vias.

---Shuping



-----Original Message-----
From: Jon Elson [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 15, 2002 12:38 PM
To: Protel EDA Forum
Subject: Re: [PEDA] Fan out Via clearance


Shuping Lew wrote:

> Hello, all,
>
> I am using Protel 99Se Auto router for fan out Vias.  I'd like to have
> one trace go in between fan out vias. Is there a rule to set it up?
> Thank you very much!

Fortunately, fanout is one of the first things it does.  You should be
able to find a combination of track width, via OD, and grid that will
cause the vias to be placed far enough apart to allow a trace to pass
between them.  It may take some tinkering.  You may want to set
particular rules, just do fanout in the autorouter run, then change the
rules and run again, with lock all preroutes.

Jon

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