PEX8680-16U8D BB RDK

PEX8680-16U8D BB RDK Datasheet


PEX 8680, PCI Express Gen 2 Switch, 80 Lanes, 20 Ports

Part Datasheet
PEX8680-16U8D BB RDK PEX8680-16U8D BB RDK PEX8680-16U8D BB RDK (pdf)
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PEX 8680, PCI Express Gen 2 Switch, 80 Lanes, 20 Ports

PEX 8680 General Features
o 80-lane, 20-port PCIe Gen2 switch - Integrated GT/s SerDes
o 35 x 35mm2, 1156-ball FCBGA package o Typical Power Watts

PEX 8680 Key Features
o Standards Compliant - PCI Express Base Specification, r2.0 backwards compatible w/ PCIe r1.0a/1.1 - PCI Power Management Spec, r1.2 - Microsoft Vista Compliant - Supports Access Control Services - Dynamic link-width control - Dynamic SerDes speed control
o High Performance performancePAK 9 Read Pacing bandwidth throttling 9 Multicast 9 Dynamic Buffer/FC Credit Pool - Non-blocking switch fabric - Full line rate on all ports - Packet Cut-Thru with 176ns max packet latency x16 to x16 - 2KB Max Payload Size
o Multi-Host & Fail-Over Support - Configurable Non-Transparent NT port - Failover with NT port - Up to Six upstream/Host ports with 1+1 or N+1 failover to other upstream ports
o Quality of Service QoS - Eight traffic classes per port - Weighted round-robin source port arbitration
o Reliability, Availability, Serviceability visionPAK 9 Per Port Performance Monitoring Per port payload & header counters 9 SerDes Eye Capture 9 Error Injection and Loopback - 4 Hot Plug Ports with native HP Signals - All ports hot plug capable thru I2C Hot Plug Controller on every port - ECRC and Poison bit support - Data Path parity - Memory RAM Error Correction - INTA# and FATAL_ERR# signals - Advanced Error Reporting - Port Status bits and GPIO available - Per port error diagnostics - JTAG AC/DC boundary scan

The ExpressLaneTM PEX 8680 device offers Multi-Host PCI Express switching capability enabling users to connect multiple hosts to their respective endpoints via scalable, high bandwidth, non-blocking interconnection to a wide variety of applications including servers, storage systems, and communications platforms. The PEX 8680 is well suited for fan-out, aggregation, and peer-to-peer applications.

Multi-Host Architecture The PEX 8680 employs an enhanced version of PLX’s field tested PEX 8648 PCIe switch architecture, which allows users to configure the device in legacy single-host mode or multi-host mode with up to six host ports capable of 1+1 one active & one backup or N+1 N active & one backup host failover. This powerful architectural enhancement enables users to build PCIe based systems to support high-availability, failover, redundant and clustered systems.

High Performance & Low Packet Latency The PEX 8680 architecture supports packet cut-thru with a maximum latency of 176ns x16 to x16 . This, combined with large packet memory, flexible common buffer/FC credit pool and non-blocking internal switch architecture, provides full line rate on all ports for performance-hungry applications such as servers and switch fabrics. 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 2048 bytes, enabling the user to achieve even higher throughput.

Data Integrity The PEX 8680 provides end-to-end CRC ECRC protection and Poison bit support to enable designs that require end-to-end data integrity. PLX also supports data path parity and memory RAM error correction circuitry throughout the internal data paths as packets pass through the switch.

Flexible Configuration

The PEX 8680’s 20 ports can be configured to lane widths of x1, x2, x4, x8,
or x16. Flexible buffer
allocation, along with the
device's flexible packet
flow control, maximizes throughput for applications

PEX 8680

PEX 8680
where more traffic flows in
the downstream, rather than upstream, direction. Any
19 x4
6 x8 6 x4
port can be designated as the upstream port, which can be
changed dynamically.

Figure 1 shows some of the PEX 8680’s common port

PEX 8680

PEX 8680
configurations in legacy

Single-Host mode.
4 x8 10 x4

Figure Common Port Configurations

PLX Technology,
5/14/2009, Version

PEX 8680, PCI Express Gen 2 Switch, 80 Lanes, 20 Ports

The PEX 8680 can also be configured in Multi-Host mode where users can choose up to six ports as host/upstream ports and assign a desired number of downstream ports to each host. In Multi-Host mode, a virtual switch is created for each host port and its associated downstream ports inside the device. The traffic between the ports of a virtual switch is completely isolated from the traffic in other virtual switches. Figure 2 illustrates some configurations of the PEX 8680 in Multi-Host mode where each ellipse represents a virtual switch inside the device.

The PEX 8680
also provides
Product Ordering Information

PEX8680-AA50BC F
80-Lane, 20-Port PCI Express Switch, Pb-Free 35x35mm2

PEX8680-16U8D BB PEX 8680 Rapid Development Kit with
x16 Upstream and Eight x8 Downstream

Figure PEX8680-16U8D BB RDK

Development Tools

PLX offers hardware and software tools to enable rapid customer design activity. These tools consist of a hardware module PEX 8680 RDK , hardware documentation available at and a Software Development Kit also available at

PLX Technology, Inc. All rights reserved. PLX, the PLX logo, ExpressLane, Read Pacing and Dual Cast are trademarks of PLX Technology, Inc. All other product names that appear in this material are for identification purposes only and are acknowledged to be trademarks or registered trademarks of their respective companies. Information supplied by PLX is believed to be accurate and reliable, but PLX assumes no responsibility for any errors that may appear in this material. PLX reserves the right, without notice, to make changes in product design or specification.

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PLX Technology,

Page 5 of 5
5/14/2009, Version
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Datasheet ID: PEX8680-16U8D BB RDK 520513