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RE: PLX 9080 in 3.3V signaling environment

To: "Carter Buck" <CBuck@PLXTech.com>
Subject: RE: PLX 9080 in 3.3V signaling environment
From: "Ingraham, Andrew" <Andrew.Ingraham@hp.com>
Date: Wed, 29 May 2002 08:38:45 -0400
Cc: "Jim Stevens" <Jim.Stevens@measurementcomputing.com>, <pci-sig@znyx.com>
Resent-Date: Wed, 29 May 2002 05:52:35 -0700
Resent-From: pci-sig@znyx.com
Resent-Message-ID: <LFLF2B.A.8eH.13M98@electra>
Resent-Sender: pci-sig-request@znyx.com
Thread-Index: AcIGprfdFgdNs7cBQ76cW0p+rcoyDQAZc5gn
Thread-Topic: PLX 9080 in 3.3V signaling environment

Um, something MUST connect to the PCI's Vi/o lines in order to be compatible with both 3.3V and 5V signaling environments.

If you don't connect to Vi/o, you cannot claim to comply with the PCI specs in both environments.

It can be as simple as using Vi/o to control the clamps within the IC, because the clamping MUST change depending on whether it is a 3.3V or a 5V environment.  If the clamping doesn't change, you are not PCI compatible.

Regards,
Andy


> ----------
> If you power the 9080 PCI buffers from the 3.3V supply then the PCI 
> signaling is compatible with both 3.3V and 5V environments.  These power 
> pins (VDDH) must not connect to the PCI Vio lines.
>

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