Ian
This could be   not a pad stack feature since you can not create a pad stack
for every combination of via or pad layer  used.   Remember the internal pad
is only used when a  trace is connected to it.       I have used Accel to
create complex pad stacks but again this feature has nothing to do with
internal annular ring size which is all you are controlling with complex pad
stacks.   Also you could not use a padstack feature for  the hundred
variations of which pads are connected and not connected on a lets say a
14 - 16 layer design.  The permutations are maybe 96 or more different
padstacks you would have to create, then picking  a via or pad would be
impossible.     I doubt if the complex pad stack feature in DXP is any
difference than Accel.   It wouldn't suffice.
Minimal annular ring rules would have to be applied internally ,  along with
additional clearance rules for  internal layers , drill to trace clearance
rule  , and even a mfg drill tolerance might be required.

Then I might be able to cut my BGA designs    number of layers by half.

Mike Reagan




----- Original Message -----
From: Ian Wilson <[EMAIL PROTECTED]>
To: Protel EDA Forum <[EMAIL PROTECTED]>
Sent: Tuesday, September 17, 2002 6:57 PM
Subject: Re: [PEDA] Inner pad feature


> On 05:49 PM 17/09/2002 -0400, Michael Reagan (EDSI) said:
> >Exactly JAMI
> >A BGA application is ideal for dumping the pad.  It might make the
> >difference between using twice as many layers to route a BGA
> >
> >Mike
>
> The padstack feature has been extended in DXP to allow control on all the
> inner layers individually (full padstack mode) - so you would be able to
> manually control what pads and what layers have annuli.  This helps but
> does not completely solve the problem.
>
> The problem being you may make a connection on a layer and forget to
> increase the annulus on that layer.  I am trying to think if the query
> system would allow a rule to be applied that would catch this - but as
> powerful as they are I can't think how one would construct a query that
> allowed you to determine that a specific layer of a pad had a connection,
> and how one would be able to selectively apply that to each layer without
> having to have a rule for all layers. (Vias don't have the full padstack
> option.)
>
> This would be a powerful extension - I think I will propose this and see
> what the response is.
>
> Ian
>
>
>

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