Re: [SI-LIST] : PCI length calculations

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Tue Feb 20 2001 - 23:33:56 PST


Suchitha,

Because the PCI is a reflected wave bus with non-uniform
stubs, there is no closed form analytical way to determine the maximum
trace length for reliable operation. There are too many possible
resonance conditions that may occur.

The only way to guarantee reliable PCI bus operation is thorough
rigorous simulation and sensitivity analysis of the devices, board
conditions and parametric variations.

I can guarantee you that there are many short PCI busses which
do not work over all possible conditions, and many long PCI busses
which do. The difference is good design and system simulation.

regards,

scott

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com

Suchitha.V@smartm.com wrote:

> Hi, > > I have 8 devices on the PCI bus. This is for custom mother board > application. > > Regards > suchitha > > Hi! Can you mentions how many devices are on this PCI bus and whether this > PCI is being implemented for motherboard or using chips with PCI compliant > interface on a single board? > Bhavesh > > -----Original Message----- > From: Suchitha.V@smartm.com > To: si-list@silab.eng.sun.com > Sent: 2/20/01 8:55 PM > Subject: [SI-LIST] : PCI length calculations > > Hello All, > > I have a question regarding PCI length calculations for a 32 bit 33 MHz > PCI > Bus. > How do you arrive at the maximum length for a PCI 33 MHz bus? > I have done some calculations to arrive at the routed length required. > But the length is much lesser than the PCI length specified for 33MHz( > which > assumes say 12 inches as maximum) > Can anyone explain how to arrive at PCI lengths > > Looking forward to your replies and suggestions > > Regards > Suchitha > ? > > **** To unsubscribe from si-list or si-list-digest: send e-mail to > majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE > si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. > si-list archives are accessible at http://www.qsl.net/wb6tpu > **** > > **** To unsubscribe from si-list or si-list-digest: send e-mail to > majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE > si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. > si-list archives are accessible at http://www.qsl.net/wb6tpu > ****

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