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

Good question.  My experience is only with 1+1 laser drilled microvias, thus
on a 12 layer board, blind is 1-2 and 11-12, buried is 2-11.  Although I
have been thinking about it, I have never used the microvia stop layer as
all ground pour, so I have not yet had the problem you mention.

Suppress unconnected pads in the gerber setup is by layer, so I have to be
sure and remember not to do it on layers 2 and 11.  In fact, I rarely do it
anyway on signal layers, but only on plane and layers with lots of pours. 


Patrick Westfeldt, Jr.
720-406-0887

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Rob Blomström
Sent: Tuesday, June 28, 2005 10:43 AM
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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