[PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2
- From: "Gary MacIndoe" <gary.macindoe@xxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Wed, 4 May 2005 08:25:54 -0600
Hey Kevin,
Yeah, I'm on 15.2/XP.
I would think that with Cadence making pretty good progress with the dynamic
thing, they would have fixed what I'm sure could still be considered "auto
void". Oh well, maybe in a few more years... So, I guess I'll be sticking
to negative planes, it's worked well for many years now.
Thanks for the response!
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
-> -----Original Message-----
-> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
-> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Kevin McCowan
-> Sent: Wednesday, May 04, 2005 6:07 AM
-> To: icu-pcb-forum@xxxxxxxxxxxxx
-> Subject: [PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2
->
->
-> Yeah. This is a problem. I just ignore the drc's that
-> are around obviously cleared places anymore.
-> The more decimal places you have the stupider it gets.
-> At 3 places it is 4.999 when it should be 5.
-> I am sorry to hear that they still have not fixed it
-> in 15.2. You are on 15.2, right?
-> Watch out, though. Some times it does not clear vias
-> and pins that it should. I have recently taken to
-> moving the plane 0 mils (lift and drop) to get it to
-> regenerate the voids and that seems to work pretty well.
->
-> Kevin McCowan
-> Sr. PCB Designer
-> TSI Telsys
->
-> Gary MacIndoe wrote:
-> > 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
-> > *A*dvanced *M*icro *D*evices, Inc.
-> > Longmont, Colorado
-> >
-> >
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