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PEX8615BA-BB4U1DRDK Datasheet(PDF) 2 Page - PLX Technology |
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PEX8615BA-BB4U1DRDK Datasheet(HTML) 2 Page - PLX Technology |
2 / 4 page Flexible Port Configurations The PEX 8615 supports a large number of port configurations as shown in figure 1 below. Please refer to the PEX 8615 datasheet for more port configuration options. Figure 1. PEX8615 Port Configurations Hot-Plug for High Availability Hot-Plug capability allows users to replace hardware modules and perform maintenance without powering down the system. The PEX 8615 Hot-Plug capability feature makes it suitable for High Availability (HA) applications. If the PEX 8615 is used in an application where one or more of its downstream ports connect to PCI Express slots, each port’s Hot-Plug Controller can be used to manage the Hot-Plug event of its associated slot. Every port on the PEX 8615 is equipped with a Hot-Plug control/status register to support Hot-Plug capability through external logic via the I 2C interface. Dual Cast The PEX 8615 supports Dual Cast, a feature which allows for the copying of data (e.g. packets) from one ingress port to two egress ports allowing for higher performance in storage, security, and mirroring applications. Read Pacing The Read Pacing feature allows users to throttle the amount of read requests being made by downstream devices. In the case where a downstream device requests several long reads back- to-back, the Root Complex gets tied up in serving this downstream port. If this port has a narrow link and is therefore slow in receiving these read packets from the Root Complex, then other downstream ports may become starved – thus, impacting performance. The Read Pacing feature enhances performances by allowing for the adequate servicing of all downstream devices by intelligent handling of read requests. SerDes Power and Signal Management The PEX 8615 provides low power capability that is fully compliant with the PCI Express power management specification. In addition, the SerDes physical links can be turned off when unused for even lower power. The PEX 8615 supports software control of the SerDes outputs to allow optimization of power and signal strength in a system. The PLX SerDes implementation supports four levels of power – off, low, typical, and high. The SerDes block also supports loop-back modes and advanced reporting of error conditions, which enables efficient debug and management of the entire system. Port and Virtual Channel (VC) Arbitration The PEX 8615 switch supports hardware fixed and Weighted Round-Robin Ingress Port Arbitration. This allows fine tuning of Quality of Service and efficient use of packet buffers for better system performance. The PEX 8615 also supports WRR VC arbitration scheme between the two virtual channels. Applications Suitable for fan-out, control plane applications, embedded systems as well as intelligent I/O applications, PEX 8615 can be configured for a wide variety of form factors and applications. Fan-Out The PEX 8615 switch, with its high port count and flexible configurations, allows user specific tuning to a variety of host- centric as well as peer-to-peer applications. Figure 2. Fan-in/out Usage Figure 2 shows a typical fan-out design, where the processor provides a PCI Express link that needs to be fanned into a larger number of smaller ports for a variety of I/O functions, each with different bandwidth requirements. In this example, the PEX 8615 would typically have a 1-lane upstream port, and as many as 11 downstream ports. The downstream ports provide x1 PCI Express connectivity to the endpoints. With its twelve ports, the PEX 8615 can provide fan-out connectivity to up to eleven PCI Express devices. The figure also shows how some of the ports can be bridged to provide PCI slots or Generic devices through the use of the PEX 8311 and PEX 8112 PCIe bridging devices. Control Plane Application The PEX 8615 is ideal for control planes in routers and other communications sub-systems to meet increased packet processing needs without compromising latency. Figure 3 |
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