[PCB_FORUM] Re: Removing unused pad rings on inner layers DURING design...

  • To: <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Thu, 31 Mar 2005 11:25:44 -0800

David,

So you are saying that the padstack should be using "drill to copper" by
default (no pads); 
If there is a connection on a particular inner layer, a pre defined pad
size should be used
Instead. I like that.

Thanks,
Julian 

-----Original Message-----
From: David Greig [mailto:david@xxxxxxxxxxxxxx] 
Sent: Thursday, March 31, 2005 11:14 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Removing unused pad rings on inner layers
DURING design...

Hi Austin,

There does not seem to be any way of doing this. I too prefer to err
towards drill to copper clearances rather than have unused pads.
Certainly for power planes under area array devices this significantly
reduces the colander effect, and so long as one is aware of CAF this is
preferable.
Designing without non-functional pads is highly preferable for the very
reason that some 3D solver translators still include them even if the
padstack is optional.
If only normal routing would choose an appropriate padstack in the same
way as blind/buried. Padstack editor unfortunately does not allow a
blind/buried definition if both top and bottom pads are defined. There
is no easy workaround.

If Cadence are listening, please remove some of the formal hard coded
rules and allow drilled vias with selective internal pads to be used in
the same way as blind/buried.
A drill to copper clearance rule set would also be nice...


Best Regards
 
David Greig
______________________________
GigaDyne Ltd
Buchan House
Carnegie Campus
Dunfermline KY11 8PL
United Kingdom
t: +44 (0)1383 624 975
http://www.gigadyne.co.uk
______________________________

-----Original Message-----
From: Austin Franklin [mailto:austin@xxxxxxxxxxxx]
Sent: 2005-March-31 18:29
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Removing unused pad rings on inner layers DURING
design...

Hi,

Is there a way to not have inner layer pad rings show up unless a trace
is connected to it on that specific layer?  I know that the pad rings
can be removed by the fabricator, but I want to remove them during
design to allow for more clearance for routing between vias.  How I've
handled this in another tool is to set-up custom padstacks that have pad
rings only on the two outer layers, and the one internal layer.  It
worked fine, but obviously required more work when picking vias.

Regards,

Austin


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