RE: [SI-LIST] : Flexible and Passive PCI Backplane?

Denomme, Paul S. (Paul.Denomme@viasystems.com)
Thu, 1 Jul 1999 16:31:02 -0400

I have done several designs in the past with bus stuctures(VME) and cards
plugging in both the front and the rear of the backplane. It worked quite
well for those designs, but you really must do a mechanical analysis to see
if it is even feasible (Hopefully you don't use the gargantuan Pentium II
chip).

Good Luck!

Paul S. Denomme
Backplane Design Engineer
Viasystems Technologies Inc.
Richmond, VA 23113
804-226-5355

> -----Original Message-----
> From: Paul Levin [SMTP:levinpa@ix.netcom.com]
> Sent: Thursday, July 01, 1999 2:50 PM
> To: si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : Flexible and Passive PCI Backplane?
>
> Dear List,
>
> Having half of the four cards component-side-down is not a problem;
> fitting the assembly into about 1.4 vertical inches is. Incidentally,
> other
> than possibly the power connection (which could be implemented some
> other way), I have no need for a base board under the riser portion.
>
> Airflow directed at both sides should not be a problem.
>
> If the riser is rigid, I would expect to secure it to the rear panel (in
> the
> PCI sense of rear) and to at least one of the top and bottom plates.
> Card insertions and removals would be minimal.
>
> Thank you for the responses. Please do keep them coming!
>
> Paul Levin
> Xyratex
> (949) 476-1016 - voice
> (949) 476-1916 - fax
>
> Mackillop, William J. wrote:
>
> > Paul,
> > Off the top of my head I can think of quite a few folks that could
> > accomplish this in a horizontal passive backplane/midplane that has
> cards
> > plugging into both front and back. Do you control the mechanical part
> of
> > the design? ( for insertion and extraction ) Would component side down
> be a
> > problem for cards plugged in on opposite side? Could you control the
> air
> > flow?
> > The usual suspects (listed in no particular order):
> > Carlos Gavazzi
> > Hybricon
> > Schroff
> > Elma
> > Sanmina
> > Hadco
> > Viasystems
> > Amp
> > Teradyne
> > Bill
> > William J MacKillop
> > Viasystems
> > ph. 804.226.5367
> > Fax 804.226.5511
> > william.mackillop@viasystems.com
> <mailto:william.mackillop@viasystems.com>
> >
> > -----Original Message-----
> > From: Paul Levin [SMTP:levinpa@ix.netcom.com]
> > Sent: Thursday, July 01, 1999 11:34 AM
> > To: Signal Integrity Reflector
> > Subject: [SI-LIST] : Flexible and Passive PCI Backplane?
> >
> > Dear Si-List,
> >
> > I'm trying to fit three or four PCI cards, one being a
> single-board
> > computer, to a passive PCI backplane that must fit into a 1 RU
> > (1.75" high) chassis. One suggestion is to use a flex circuit
> for
> > the
> > backplane and then fold it horseshoe style in order to have the
> > cards 'butterfly' one or two on each side.
> >
> > Does anybody know of a source for such a backplane? Does
> > anyone have any other suggestion for getting that many PCI
> > cards into a 1 RU package?
> >
> > Thank you in advance,
> >
> > Paul Levin
> > Xyratex
> >
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