RE: [SI-LIST] : RE: PCI routing rules

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From: Ron Miller (rmiller@Brocade.COM)
Date: Thu Oct 12 2000 - 08:48:48 PDT


Try 85 ps per inch one way for FR4.

which is closer to 6 inches per ns.

Ron Miller

> -----Original Message-----
> From: JNH
> Sent: Wednesday, October 11, 2000 4:59 PM
> To: Doug Hopperstad
> Cc: si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : RE: PCI routing rules
>
> Doug,
> Based on rule of thumb, the propagation delay of PCB is about 4 inch/ns including loading, the round trip propagation delay for PCI speedway has to be 10ns. Therefore, the maximum trace length for PCI is 4 inch/ns x 10ns / 2 = 20 inch.
>
> I hope it helps to you.
>
> Best Regards,
>
> John Lin
> Quanta Computer Inc.,Taiwan, R.O.C.
> Email: John@quantatw.com
> Tel: 886+3+3979000 ext. 5183
>
>
> -----Original Message-----
> From: Doug Hopperstad [ <mailto:doug.hopperstad@qlogic.com>]
> Sent: Thursday, October 12, 2000 3:18 AM
> To: 'si-list@silab.eng.sun.com'
> Subject: [SI-LIST] : RE: PCI routing rules
>
>
> Does anyone have any information on PCI routing rules. I am trying to
> determine the maximum trace length between PCI devices and have been
> struggling with the 10nS time margin. Is there a formula to determine the
> maximum trace length between PCI devices?
>
> Doug Hopperstad
> QLogic Corporation
> doug.hopperstad@qlogic.com
>
>
>
>
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