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1-8
External I/O Expansion Unit for SPARC Enterprise M
x
000 Servers Installation and Service Manual • April 2011
FIGURE 1-5
PCI-X and PCI Express I/O Boat Layouts, Compared
A PCI-X I/O boat is shown on the left side of
. This boat has six PCI-X
sockets and one link socket.
A PCI Express I/O boat is shown on the right side. There are six PCI Express sockets
and one link socket.
All PCI card data passes through the link card in the I/O boat.
A boat slot accepts either type of I/O boat.
When you run system diagnostics, the switches and bridges are displayed in the
output of OpenBoot PROM probing. However, the link cards themselves never
appear during OpenBoot PROM probing. For examples of OpenBoot PROM output,
see
.
Note –
A bridge is a device that converts PCI Express and PCI-X signal formats and
connects multiple busses to a single bus. A switch is a device that connects multiple
busses to a single bus, without converting the signals to another format.
PCI-X I/O boat
6 PCI-X slots
32 lane switch
PCI-E I/O boat
32 lane switch
32 lane
switch
32 lane
switch
Bridge
Bridge
Bridge
Link 0
Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6
6 PCI-E slots
Link 0
Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6
6 PCI Express slots
PCI Express I/O boat
Summary of Contents for SPARC Enterprise M4000
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