Sun Microsystems 5500, Reference Manual

Page: 87 / 304

Chapter 4 I/O+ Boards and Components 4-29
4.5.7 PCI Cards
Each PCI+ I/O board can accommodate two PCI (short) cards. The PCI cards are
plugged into receptacles on corresponding riser cards that are mounted on the PCI+
I/O board. The riser cards can be one of two voltage types, either 5.0V or 3.3V.
The voltage rating of a PCI card must be matched to the rating of the riser card and
connector on the motherboard. The PCI bus connectors of PCI cards can be one of
three possible types, those that can be used with 5.0V or 3.3V connector receptacles
only, and those that can be used with either voltage type.
Sun PCI+ I/O boards are shipped with two 5.0V riser cards (installed) and two 3.3V
riser cards (not installed). If you are switching to a 3.3V PCI card, you must replace
the existing 5.0V riser card with the 3.3V riser card. See Section 4.5.7.3 “Replacing
Riser Cards” on page 4-33.
4.5.7.1 Removing a PCI Card
1. Use the procedures in Section 4.5.2 “Removing a Board,” to remove the applicable
I/O+ board.
Note –
Some PCI cards may not utilize the standoffs provided for mounting.
2. On the noncomponent side of the I/O+ board, loosen the locking standoff for the
corresponding PCI card that is to be removed (
FIGURE 4-26
).