[PCB_FORUM] Re: Unssuported pads and B/B vias

It's even more complicated in some cases.  

We have one vendor that wants intervening pads in place for 2 layer laser
microvias, and another that doesn't.

We have decided to not suppress any pads and have the vendor delete the ones
they don't need.  Less hassle in the long run :)

-- 
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272         Fax: 503-627-5587
http://www.tektronix.com    http://www.pcb-designer.com

It's my opinion, not Tektronix' 



-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Rob Blomström
Sent: Tuesday, June 28, 2005 09:43
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Unssuported pads and B/B vias


All,

I've been reading the earlier discussions about routing and outputting
   unsupported pads on designs. I have been doing this as a matter of course
   for years, but today I had a new twist added to the problem based on a
question from
   a new pcb fab vendor that we are having boards quoted by.

Typically, I ask the artwork generation parameters to "Suppress unconnected
pads"
   on all my inner layers and have never had any problems from the vendors.

However, it seems that during all this time, the tool has been omitting the
entry/exit
   padstacks from blind and buried vias (if the entry/exit falls on on inner
layer)
   as well as my intended targets of non-routed-to vias.
   My current vendor has simply been dealing with the issue and not stopping
to flag the problem.

Does anyone have any thoughts on how to keep extry/exit via pads but
continue to surpress the
   truely unconnected pads?

Thanks,

Rob Blomstrom, Senior PCB Designer
rob@xxxxxxxxxxxxx
http://blomstrom.biz/rob

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