[PCB_FORUM] Re: Where do you set drill to other features clearance?

Hi Gary,

I have a smd component that requires the gnd plane (layer 2) to be cleared 
underneath the part for SI reasons.  Do you have any good automatic way of 
doing this other than making a manual void in the shape?

Thanks,


Dale Rasmusen
CAD Manager
TEKNOVUS
(707) 665-0400 ext 133
(707) 665-0491 fax
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Friday, June 20, 2008 8:23 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Where do you set drill to other features clearance?


Hey Austin,



The clearance for a shape is accomplished in one of two ways (negative or 
positive shapes).



For inner negative shapes (planes), Allegro uses the padstack definition, "Anti 
Pad".

If you need to increase this clearance on a board wide basis, you would modify 
the "Anti Pad" definition for the padstack in the design.

If you want to increase the clearance on a case by case basis (i.e. "individual 
THP"), use Shape -> Manual Void -> Circular (or Rectangular, Polygon etc.).



For a positive inner or outer shape, you have much more control.

Using Shape -> Global Dynamic Params..., you set up the parameters that will be 
applied to every shape that you create in your design.



Then, you can adjust the parameters of each shape individually, after it is 
created:

-          Shape - > Select Shape or Void

-          click on the shape to highlight it

-          RMB on the shape to Parameters...

-          Adjust the parameters as needed





Good luck, e-mail me if you have any questions about this.



Gary


 [cid:image001.gif@01C8D2B9.65F050D0]
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxxxxxxxxxxxxxxx Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Austin Franklin
Sent: Thursday, June 19, 2008 5:33 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Where do you set drill to other features clearance?



Hi,



In PADS, the clearance matrix contains a drill to other feature clearance

(such as copper, trace, via, pad).  Where in Allegro can I set up similar

clearances, say, for drill to copper (shape)?



Regards,



Austin



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