RE: [SI-LIST] : PCI TOPOLOGIES

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From: Beal, Weston (weston_beal@mentorg.com)
Date: Mon May 21 2001 - 08:41:35 PDT


At a place where I used to work, I saw quite a PCI buses designed with a
different topology. They used an expansion card riser that made the PCI bus
kind of a three point star with multiple components along each leg. This
was very messy and we had to do a lot of simulation to select some series
termination at the correct locations and values. So, it can be done, but be
careful. Simulate it extensively with correct models and be prepared for
some lab debugging (since your models won't be completely correct).

Regards,
Weston

-----Original Message-----
From: Chandan Das [mailto:chandan_career@yahoo.com]
Sent: Sunday, May 20, 2001 10:58 PM
To: Zhenxi Yang
Cc: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : PCI TOPOLOGIES

Hi,

I asked the same question sometime in March, but
received no answer. I have always routed PCI signals
in a daisy-chain. I was curious to know if others have
delivered successful & reliable board-designs by using
some other topology for routing the PCI BUS.
As of now, I can only say that loads should be evenly
spaced on the PCI bus.

Please refer to the following article for another
style of routing the PCI bus:
Treat Circuit Boards as Design Components in PCI-based
Systems by Jim Murashige, EDN Magazine, 11/23/94.

Awaiting your comments.

Regards,
Chandan

> Hi,
> I want to consult you a question.
> Is daisy chain routing for PCI preferred?

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