RE: PLX 9080 in 3.3V signaling environment

["Phipps, Michael" <michael.phipps@intel.com>]

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.