[PCB_FORUM] AW: positive dynamic gnd/pwr planes in 15.2
- From: <Johannes.Schlenger@xxxxxxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 4 May 2005 14:31:18 +0200
Hey Gary,
put in at 'Global Dynamic Shape Parametsr' under Clearances in the
field 'Oversize value' the value 0.01 mil or 0.02 mil,
this will solve your problem with the DRCs.
Johannes Schlenger
PCB Designer
Fujitsu-Siemens-Computers
________________________________
Von: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] Im Auftrag von Gary MacIndoe
Gesendet: Dienstag, 3. Mai 2005 23:56
An: Allegro Forum
Betreff: [PCB_FORUM] positive dynamic gnd/pwr planes in 15.2
Hey Guys,
Those of you that create your gnd/pwr inner planes as positive and
dynamic, do you have problems after creating them? I always create mine
as negative, but I'm playing around with positives with the new fangled
dynamic shapes.
After the shape is created (either with Edit -> Split Plane -> Create,
or with Shape -> Polygon/Rectangle), there are a number of DRCs (not
allot, maybe 9 or so on a 7" square board). These DRCs are
via-to-shape, and have an actual value of 9.9 for a constraint value of
10, and some were 4.6 actual for a 5 constraint.
Are you positive plane people seeing this also? Is there a way to avoid
this? I managed to get some of them to go away by giving a Global
Dynamic Shape Parameter, Via Oversize value of 1 (I went to "2", and the
DRC count was the same, I went to "3" and my DRC count increased by
one!).
This is reminding me of the "not so good old days" of "problem points"!
Thanks for any responses!
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
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