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RE: universal card
Vi/o is connected to either 5V or 3.3V on the "motherboard or backplane" as you define your system.
When a universal card is plugged in, the Vi/o pins on the chip now are powered at the appropriate signal voltage as required by the motherboard.
3.3Volts or 5 Volts are also supplied on separate pins so that logic that always must be at a specific voltage is power appropriately.
From: Razmara, Rambod [mailto:firstname.lastname@example.org]
Sent: Wednesday, January 22, 2003 9:38 AM
Subject: universal card
A universal card will support either a 5V or 3.3V adapter. What I do not
is the Vi/o signal on PCI bus. In PCI 2.2 spec there is a signal called Vi/o
equivalent pin in 5 Volt only & 3.3 volt only cards are 5V & 3.3V
this signal routed to different power rail depending on the what is plugged