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PEX8532-BC25BI Datasheet(PDF) 3 Page - PLX Technology |
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PEX8532-BC25BI Datasheet(HTML) 3 Page - PLX Technology |
3 / 4 page Graphics Fan-out Switch The number and variety of PCI Express native-mode devices is growing quickly. The devices such as graphics cards are expected to become mainstream very rapidly. As that happens, it will be necessary to take a wide (x16) graphics port on the root complex device and fan it out to four x4 or two x8 ports. Figure 3. Graphics Fan-out Dual Host Model The ExpressLane PEX 8532 supports applications requiring dual host, host failover, and load-sharing applications through the non-transparency feature. Figure 4 illustrates a dual host system using an intelligent adapter card. Figure 4. Dual Host Usage In this figure, 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 both 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. Dual Fabric Model High performance communications, storage, and blade server systems often require more reliability than a single host system provides. For these high availability systems, all single points of failure must be eliminated. The ExpressLane PEX 8532 can offer this additional level of redundancy by linking together 2 switch fabric cards in a dual-star topology. Figure 5 shows an example of such a system. In this system, both the host and fabric are on separate cards, and both can be active simultaneously. The unique non-transparency feature of the PEX 8532 is used to allow one fabric/host card to be the primary and the other to be the secondary. This approach can be used to provide more than two active processing nodes. It is straightforward to create a generalized multiprocessor system with smaller ExpressLane switches on each card in non-transparent mode, and several PEX 8532 fabric cards to provide the fabric backbone. Figure 5. Dual Host & Fabric Usage Switch Fabric Module The ExpressLane PEX 8532 can also be used in Blade Server switch fabric applications. Figure 6 illustrate the use of PEX 8532 in a Benes Switch configuration. The non-transparency and peer-to-peer functions of PEX 8532 enable use of fewer total switching elements and less hops from source to destination. Figure 6. Benes Switch Fabric |
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