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PEX8525-AARDK Datasheet(PDF) 2 Page - PLX Technology |
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PEX8525-AARDK Datasheet(HTML) 2 Page - PLX Technology |
2 / 4 page PLX Confidential Low Power with Granular SerDes Control The PEX 8525 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. Flexible Port Width Configuration The width of each port can be individually configured through auto-negotiation, hardware strapping, host software configuration, I 2C interface, or through an optional EEPROM. The PEX 8525 supports a large number of port configurations (see Figure 1). For example, if you are using the PEX 8525 in a fan-out application, you may configure the upstream port as x8 and the downstream ports as four x4 ports; two x8 ports; or other combinations as long as you don’t run out of lanes (24) or ports (5). In a peer-to-peer application, you can configure all five ports as x4. In a port aggregation application you can configure four x2 or x4 ports for aggregation into one x8 port. PEX 8525 PEX 8525 PEX 8525 PEX 8525 x8 x4 x4 x4 PEX 8525 PEX 8525 PEX 8525 PEX 8525 x8 PEX 8525 PEX 8525 PEX 8525 PEX 8525 x8 PEX 8525 PEX 8525 PEX 8525 PEX 8525 x4 x8 x8 x4 x4 x2 x2 x4 x4 x4 x4 x4 Figure 1. Common Port Configurations Low Packet Latency The PEX 8525 supports packet cut-thru with a max packet latency of 115ns between symmetric x8 ingress and egress ports. The low latency enables applications to achieve high throughput and performance. In addition to low latency, the device supports a packet payload size of up to 1024 bytes, enabling the user to achieve even higher throughput. Hot Plug for High Availability Hot plug capability allows users to replace hardware modules and perform maintenance without powering down the system. The PEX 8525 hot plug capability and Advanced Error Reporting features makes it suitable for High Availability (HA) applications. Three downstream ports include a Standard Hot Plug Controller. If the PEX 8525 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. Furthermore, its upstream port is a hot-plug client, allowing it to be used on hot-pluggable adapter cards, backplanes, and fabric modules. Fully Compliant Power Management For applications that require power management, the PEX 8525 device support both link (L0, L0s, L1, L2/L3 Ready, and L3) and device (D0 and D3hot) power management states, in compliance with the PCI Express power management specification. SerDes Power and Signal Management The PEX 8525 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. Applications Suitable for host-centric as well as peer-to-peer traffic patterns, the PEX 8525 can be configured for a wide variety of form factors and applications. Host Centric Fan-out The PEX 8525, with its symmetric or asymmetric lane configuration capability, allows user-specific tuning to a variety of host-centric applications. Figure 2 shows a typical server- based design where the root complex provides a PCI Express link that needs to be expanded to a larger number of smaller ports for a variety of I/O functions. In this example, the PEX 8525 would Figure 2. Fan-in/out Usage typically have an 8-lane upstream port, and as many as CPU CPU Memory Memory Chip Set Chip Set End Point End Point x8 x4 PEX 8525 PEX 8525 x4 x4 x4 CPU CPU CPU CPU Memory Memory Memory Memory Chip Set Chip Set Chip Set Chip Set End Point End Point End Point End Point x8 x4 PEX 8525 PEX 8525 PEX 8525 PEX 8525 x4 x4 x4 |
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