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RE: PCI-X Compatibility

To: "Markou, Pete" <Pete.Markou@GDC4S.Com>
Subject: RE: PCI-X Compatibility
From: "Ingraham, Andrew" <Andrew.Ingraham@hp.com>
Date: Tue, 25 Jun 2002 08:32:44 -0400
Cc: <pci-sig@znyx.com>
Resent-Date: Tue, 25 Jun 2002 05:38:16 -0700
Resent-From: pci-sig@znyx.com
Resent-Message-ID: <xyoIB.A.2FB.SMGG9@electra>
Resent-Sender: pci-sig-request@znyx.com
Thread-Index: AcIcP1GaGQqe5KrhRdm8PTi9FtH3BQAAhnbS
Thread-Topic: PCI-X Compatibility

>    My question is, can a
> PCI-X interface be used on a 5 volt PCI 33Mhz/32 bit bus or is PCI-X only
> compatible with a 3.3 volt signaling environment?
 
PCI-X (in PCI-X mode) is 3.3V only.

But that doesn't prevent you from having a PCI-X device, on a plug-in card, that also complies with the PCI 5V signaling environment.  See sections 6.1.1 and 6.1.3 in the PCI-X spec, revision 1.0a.

Like any "universal" PCI device, it would need to sense the Vi/o voltage from the PCI connector, and set its overshoot clamps accordingly.  And, of course, the ASIC vendor's PCI-X buffers must comply with both the 3.3V and 5V signaling specs.

Andy

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