Figure 2 shows a typical
server-based
design, where the
Root Complex provides a PCI Express link that needs to
be expanded into a larger number of smaller ports for a
variety of I/O functions, each with different bandwidth
requirements.
In this example, the ExpressLane PEX 8533 would
typically have an 8-lane upstream port, and as many as 5
downstream ports. The downstream ports can be of
differing widths if required.
Peer-to-Peer & Backplane Usage
The PEX 8533 is also suitable for peer-to-peer
applications such as switch fabrics and backplanes.
Figure 3 represents a backplane where the device
provides peer-to-peer data exchange for a large number
of line cards where the CPU/Host plays the management
role.
Figure 4. Dual Graphics
Redundant Switch Fabric
The PEX 8533 can be used in redundant switch fabrics
for high availability applications. In the example shown
in Figure 5, the PEX 8533 is used in conjunction with
the PEX 8518 switch that offers
non-transparent
bridging (NTB).
The PEX 8533 provides high
performance non-blocking switching while the PEX
8518s keep the two fabrics and hosts isolated.
Figure 3. Peer-to-Peer/Backplane Usage
Graphics Fan-out Switch
High resolution 3D graphics applications can take full
advantage of the PEX 8533 three port configuration.
Applications such as
dual graphics, high resolution
scientific use, and image processing
can benefit from
the performance of the PEX 8533 switch. Figure 4
illustrates use of the device in a dual graphics
application while supporting PCI port expansion through
another PLX PCIe switch. The upstream x16 port links
to the Root Complex and the two downstream ports
connect to the Graphics modules. The peer-to-peer
support of the PEX 8533 allows the two GPU modules
to communicate with each other for maximum
performance. Figure 4 also illustrates use of PCIe
bridges to connect to PCI and PCI-X busses.
Figure 5. Blade Server
The number of ports and port widths can be configured
as needed. This example assumes a x8 link to each CPU
blade and a x8 link to each I/O blade.
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