[PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2

From: Don.Kost@xxxxxxxxxxx
To: icu-pcb-forum@xxxxxxxxxxxxx
Date: Thu, 5 May 2005 06:55:48 -0400

As with anything there are good points and bad points.
The good points include the ability change thermal connection width individually instead of globally, WYSIWYG and clearances on planes that follow the spacing constraints.
The bad points include the increase in the size of your design. My last design almost doubled to 45 Meg!
Overall, I agree with Kevin and Dave, that you should look into all the added benefits. I use the oversize field in the global shape setup and have not had any problems.
Don ...........................

"Dave Mattice" <DMattice@xxxxxxxxxxxxxxxxx>

"Dave Mattice" <DMattice@xxxxxxxxxxxxxxxxx>

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05/04/2005 05:01 PM

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Subject	[PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2

I agree with Kevin regarding positive planes. Please look into the properties that can be added To pins for clearances and thermal connections Before deciding. I would never go back to negative Planes. -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin McCowan Sent: Wednesday, May 04, 2005 7:31 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2 Well, I recommend going to positive planes. I have and I have never looked back. Even with the little peculiarities I think that the benefits outweigh the drawbacks. The seeing what you get is a real bonus. You should mess around with them a little more before you decide not to change. Kevin Gary MacIndoe wrote: > 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 > -> ----------------------------------------------------------- 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 -----------------------------------------------------------

References:
- [PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2
  - From: Dave Mattice

[PCB_FORUM] Re: positive dynamic gnd/pwr planes in 15.2

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