[PCB_FORUM] Re: double stacked components
- From: "Gene Carman" <gcarman@xxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 15 Sep 2004 16:53:05 -0700
Actually the original question was:
"we have boards with with multiple load options, which means we somtimes have
two versions of a thru hole connector stacked on top of each other. this means
you have thru hole pins directly on top of each other. how do others handle
this as far pin to pin drc's and duplicate drills in the drill table?"
Not that we need to battle over semanitics... This is an Allegro forum.
The alternative footprint idea is probably the best solution to the original
DRC problem. Would be nice though if we could just place a couple footprints in
violation and select a property and say "these are OK to touch..."
Side issue RE semanitics... Most PWB designers call the things we put on boards
"footprints." So how did Cadence start using "symbols?" And did no engineer
point that that "symbols" are typically used in schematics? Of course Mentor
uses the term "Geometries... " sigh...
Just one of those head scratchers.
-----Original Message-----
From: chris.ball@xxxxxxxxx [mailto:chris.ball@xxxxxxxxx]
Sent: Wednesday, September 15, 2004 1:25 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: double stacked components
Oh, well let me see... Think my original response was a question asking if
it could be used. Then I responded to a response....
Seems to me that in some cases, you could make a footprint that works for
both, make it an alternate for both in the library, then use variant
manager to choose which to use on a particular assy. I was wondering if
anyone did that. Fair enough?
"Gene Carman"
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[PCB_FORUM] Re: double
stacked components
09/15/2004 04:06 PM
Please respond to
icu-pcb-forum
Oh, so doesn't resolve the issue that was originally posted. Schematic/BOM
variants are easy... Board variants, especially those involving components
that fit into/on top of/ use the same pad patterns as... other parts are a
pain. I tend to make a part to fit the unique need also.
-----Original Message-----
From: chris.ball@xxxxxxxxx [mailto:chris.ball@xxxxxxxxx]
Sent: Wednesday, September 15, 2004 12:41 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: double stacked components
It doesn't / you don't.
It's only good for de-pops and substitutions where both parts share the
same symbol... typically value changes.
"Gene Carman"
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[PCB_FORUM] Re: double
stacked
components
09/15/2004 03:24 PM
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icu-pcb-forum
But how does variant manager handle the drcs of parts placed on top of each
other in the layout?
-----Original Message-----
From: chris.ball@xxxxxxxxx [mailto:chris.ball@xxxxxxxxx]
Sent: Wednesday, September 15, 2004 12:17 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: double stacked components
Tried to find you a link to a description but Cadence has re-named
everything since I bought. Allegro Expert came standard with it, I think. I
paid extra for it as an add-on to PCB Design Studio. It allows you to
create variant assemblies/schematics/BOM's with(out) de-populated and/or
substituted parts.
So you make a master schematic with everything, lay the board out, make a
master assembly (every part placed), then use the Variant Manager to create
unique assy/sch drawings depending on what you want stuffed.
-Chris
JACK KELLY
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[PCB_FORUM] Re: double
09/15/2004 03:01 PM stacked
components
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what is the "variant manager" i haven't seen that
-----Original Message-----
From: chris.ball@xxxxxxxxx [mailto:chris.ball@xxxxxxxxx]
Sent: Wednesday, September 15, 2004 1:41 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: double stacked components
Doesn't the "VARIANT MANAGER" handle this kind of thing? I thought there
were provisions for substitutions as well as de-pop... but I'm still a
Cadence newbie and can't speak from experience. I would guess you'd need a
single footprint that was valid for both part numbers; a 'worst of both'.
-Chris
Kevin McCowan
<kmccowan@xxxxxxxxxxxxxx> To:
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[PCB_FORUM] Re: double
stacked
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09/15/2004 02:33 PM
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I try to build a version that would cover both components at the
same time so this problem doesn't happen. Otherwise you just
need to ignore the drcs as "part of your job".
This is an ongoing problem that I believe has never been addressed
in the industry. I wonder why?
Hope this helps,
Kevin McCowan
Sr. PCB Designer
TSI Telsys
JACK KELLY wrote:
> we have boards with with multiple load options, which means we somtimes
have two versions of a thru hole connector stacked on top of each other.
> this means you have thru hole pins directly on top of each other. how do
others handle this as far pin to pin drc's and duplicate drills in the
> drill table?
> thanks in advance
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