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PEX8696 Datasheet(PDF) 4 Page - PLX Technology |
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PEX8696 Datasheet(HTML) 4 Page - PLX Technology |
4 / 5 page PEX 8696, PCI Express Gen 2 Switch, 96 Lanes, 24 Ports variety of host-centric applications. Figure 6 shows a server design where, in a quad or multi processor system, users can assign endpoints/slots to CPU cores to distribute the system load. The packets directed to different CPUs will go to different (user assigned) PEX 8696 upstream ports, allowing better queuing and load balancing capability for higher performance. CPU CPU CPU CPU CPU CPU CPU CPU x8 x4s Memory Memory Memory Memory x8s x4 x16 Endpoint Endpoint Endpoint Endpoint Endpoint Endpoint Endpoint Endpoint PCIe Gen1 or PCIe Gen2 slots x8 PEX 8696 PEX 8696 PEX 8696 PEX 8696 Chipset Chipset Chipset Chipset Figure 6. Host Centric Dual Upstream Multi-Host Systems In multi-host mode, the PEX 8696 can support up to eight hosts at once. By creating eight virtual switches, the PEX 8696 allows eight hosts to fan-out to their respective endpoints. This reduces the number of switches required for fan-out, saving precious board space and power. In Figure 7, the PEX 8696 is being shared by six different CPU cores (hosts) on three servers, with each CPU core running its own applications (I/Os). The PEX 8696 assigns the endpoints to the appropriate host and isolates them from the other hosts. In Figure 7, the endpoints are assigned to the CPU core of the same color. I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O Chip Set Chip Set Chip Set Chip Set Chip Set Chip Set PEX 8696 PEX 8696 CPU CPU CPU CPU CPU CPU Figure 7. Multi-Host System High-End Graphics Systems The PEX 8696’s 96 lanes can come in handy for high- end graphics systems, such as high-resolution gaming and medical imaging applications, employing two or more GPUs alongside multiple endpoints. Figure 8a shows a dual-graphics system where the PEX 8696 is being used to fan-out to two GPUs using x16 links and numerous (up to 16) endpoints using x4 and x8 links. Figure 8b, shows an ultra-gaming system using the PEX 8696 to fan-out to four GPUs via x16 links. In both examples, two x16 upstream ports are being used. Using PEX 8696’s multi-host capabilities, two separate virtual hierarchies can be created, assigning GPUs & endpoints to a particular CPU core via the x16 upstream ports. Figure 8b. Ultra-Gaming System x16s Chip Set Chip Set x16s GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU GPU PEX 8696 PEX 8696 PEX 8696 PEX 8696 Figure 8a. Dual-Graphics System x4s & x8s Chip Set Chip Set x16s I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O GPU GPU GPU GPU GPU GPU GPU GPU PEX 8696 PEX 8696 PEX 8696 PEX 8696 x16s CPU CPU CPU CPU CPU CPU CPU CPU Host Failover The PEX 8696 can also be utilized in applications where host failover is required. In the below application (Figure 9), two hosts may be active simultaneously and controlling their own domains while exchange status information through doorbell registers or I 2C interface. The devices can be programmed to trigger fail-over if the heartbeat information is not provided. In the event of a failure, the surviving device will reset the endpoints connected to the failing CPU and enumerate them in its own domain without impacting the operation of endpoints already in its domain. CPU CPU CPU CPU CPU CPU CPU CPU x8 x4 & x8 Chipset Chipset Chipset Chipset PEX 8696 PEX 8696 PEX 8696 PEX 8696 CPU CPU CPU CPU CPU CPU CPU CPU x8 Chipset Chipset Chipset Chipset PEX 8696 PEX 8696 PEX 8696 PEX 8696 x8s Figure 9. Host Fail-Over © PLX Technology, www.plxtech.com Page 4 of 4 5/14/2009, Version 1.1 |
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