RE: PLX 9080 in 3.3V signaling environment

[Carter Buck <CBuck@PLXTech.com>]

While the I/O buffers on the PCI 9030 are 5V tolerant, this chip does have 
a VIO pin to set the clamp voltage for 3.3V or 5V PCI signaling 
environments.  The 9030 is compliant to PCI 2.2.

Carter Buck
PLX Technology, Inc.

At 10:55 AM 5/29/02, Phipps, Michael wrote:
>Andrew I think the key word here is "tolerant". That would mean a device
>that
>is powered at 3.3 volts will function properly in a system that has 5 volt
>signals. Provided of course you still power the device at 3.3 volts.
>
>The footnotes on pages 114 and 151 mention 5V tolerant parts and state,
>"...such parts are not excluded." It is a device specific implementation.
>
>Devices that are 5V tolerant are fully PCI compliant and do meet the PCI
>specs.
>The use of such parts does not make your board non-compliant in a 3.3V
>system.
>
>I'm not sure how that would affect fully 5V "compliant".
>
>         Mike Phipps
>         Intel Corp.
>
>-----Original Message-----
>From: Ingraham, Andrew [mailto:Andrew.Ingraham@hp.com]
>Sent: Wednesday, May 29, 2002 11:58 AM
>To: PCI-SIG, Mail List
>Subject: RE: PLX 9080 in 3.3V signaling environment
>
> > The 9030 is fully 5V tolerant on the local bus regardless as to whether
>the PCI bus is 3.3 or 5V.
>
>If this device is "fully 5V tolerant" when the PCI bus is 3.3V, then this
>device does not meet the PCI Specs and should not be used on a 3.3V or
>Universal PCI card.  Using it would make your card non-compliant in the 3.3V
>PCI environment.