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PEX8533-AA25BI Datasheet(PDF) 2 Page - PLX Technology |
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PEX8533-AA25BI Datasheet(HTML) 2 Page - PLX Technology |
2 / 4 page PLX Confidential Flexible Port Width Configuration The lane 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 8533 supports a large number of port configurations. For example, if you are using the PEX 8533 in a fan-out application, you may configure the upstream port as a x8 and the downstream as one x8 port & four x4 ports; two x8 & two x4 ports; or other combinations, as long as you don’t run out of lanes (32) or ports (6). For a dual-graphics application, you may configure the device as one x16 upstream and two x8 downstream ports (see Figure 1). The device can also support x2 & x1 ports by auto-negotiating its x4 ports to the width of the actual end-device it is interfacing with. Figure 1. Port Flexibility Low Packet Latency The PEX 8533 supports packet cut-through with a latency of 115ns between symmetric x8 ingress and egress ports. The low latency enables many 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 ExpressLane PEX 8533 hot plug capabilities and Advanced Error Reporting features make them suitable for high availability (HA) applications. Three of the six ports include a Standard Hot Plug Controller. If the PEX 8533 is used in an application where one or more of its downstream ports connect to PCI Express slots, the ports with the Hot Plug Controller feature can be used for these slots. The device will automatically manage the hot-plug event of its hot- plug capable ports/slots. Furthermore, the hot-plug capable ports can be used as a hot-plug client or master, allowing it to be used on hot-pluggable carrier modules, backplanes, and fabric modules. Fully Compliant Power Management For applications that require power management, the PEX 8533 device supports 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 ExpressLane PEX 8533 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 8533 can be configured for a wide variety of form factors and applications. Host Centric Fan-out The ExpressLane PEX 8533 device, with its versatile symmetric or asymmetric lane configuration capability, allows for user specific tuning to a variety of host- centric applications. Figure 2. Fan-in/out Usage |
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