February, 2007
Dual-Host Model
2.2.4
Dual-Host Model
The PEX 8532 supports applications requiring Dual-Host, Host-Failover, and Load-Sharing
applications through the Non-Transparency feature.
Figure 2-5 illustrates a dual-host system using an intelligent adapter board. The primary CPU (on the
right) is the active host – it configures and enumerates the system, and handles interrupts and error
conditions. If the primary host ceases proper operation, the secondary host takes over the system. The
PEX 8532 can dynamically re-assign the Upstream port (from primary to secondary) and the
Non-Transparent port (from the secondary to the primary), and allow the system to continue operation.
Dynamic swapping of the upstream and NT Ports is supported on Ports 0 and 8.
Figure 2-5. Dual-Host Usage
ExpressLane PEX 8532AA/BA/BB/BC 8-Port/32-Lane Versatile PCI Express Switch Data Book
Copyright © 2007 by PLX Technology, Inc. All Rights Reserved – Version 1.6
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