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1.4.3 PCI-X board assembly
Strictly speaking the PCI-X board assembly does not truly exist in the same way
that the processor board and memory board assemblies do. The term is used
here to loosely describe the PCI-X board and I/O subsystem that together
comprise the other components of the machine.
The two PCI-X bridges in the XA-64 chipset provide support for 33, 66, 100, and
133 MHz devices using 4 PCI-X buses (labelled A–D in Figure 1-4 on page 8).
The PCI-X bridges also have two 1 GBps bi-directional Remote Expansion I/O
(RXE) ports for connectivity to the RXE-100 Expansion Enclosure. The RXE-100
provides up to an additional 12 PCI-X slots and can be connected by a single
cable to port A or to both ports A and B to provide redundancy.
The rear panel of the x455, which indicates the location of the RXE Expansion
Ports, is shown in Figure 1-2 on page 5.
PCI-X subsystem
There are six available PCI-X slots in four buses. These are shown in Figure 1-9.
Figure 1-9 PCI-X slot information
Only 3.3V cards are supported, but all slots will accept the following:
32-bit or 64-bit cards
33MHz, 66MHz, 100MHz or 133MHz cards
PCI-X slot 4
(100
MHz
PCI-X slot 5
(133
MHz
)
Back of server
PCI-X slot 6
(133 MHz)
Bus: D
C
PCI-X slot 3
)
(100
MHz
)
PCI-X slot 2
(66
MHz
)
PCI-X slot 1
(66
MHz
)
B
A
Chapter 1. Technical description
17
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