[PCB_FORUM] Re: Removing unused pad rings on inner layers DURING design...
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 31 Mar 2005 11:16:56 -0800
David has put it quite nicely.
Can we put this on the 'list of things to do' for Cadence? It's a good
one! For many reasons, including simulation being a very good one.
Andrew
-----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
-----------------------------------------------------------
To subscribe/unsubscribe:
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe
To view the archives of this list please login at
//www.freelists.org.
Our list name is icu-pcb-forum or go to
//www.freelists.org/archives/icu-pcb-forum/
Problems or Questions:
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
Want to post a job listing ? DON'T DO IT HERE!
Better yet, join our jobs listing forum.
SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx
POST: icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------
--
Virus scanned by Lumison.
-----------------------------------------------------------
To subscribe/unsubscribe:
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe
To view the archives of this list please login at
//www.freelists.org. Our list name is icu-pcb-forum
or go to //www.freelists.org/archives/icu-pcb-forum/
Problems or Questions:
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
Want to post a job listing ? DON'T DO IT HERE!
Better yet, join our jobs listing forum.
SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx
POST: icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------
-----------------------------------------------------------
To subscribe/unsubscribe:
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe
To view the archives of this list please login at
//www.freelists.org. Our list name is icu-pcb-forum
or go to //www.freelists.org/archives/icu-pcb-forum/
Problems or Questions:
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
Want to post a job listing ? DON'T DO IT HERE!
Better yet, join our jobs listing forum.
SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx
POST: icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------
Other related posts:
