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| Version 0.8 2007 Features PEX 8624 General Features o 24-lane, 6-port PCIe Gen2 switch - Integrated 5.0 GT/s SerDes o 19 x 19mm2, 324-pin FCBGA package o Typical Power: < 4.0 Watts PEX 8624 PCIe Gen2, 5.0GT/s 24-lane, 6-port Switch The ExpressLaneTM PEX 8624 device offers PCI Express switching capability enabling users to add scalable high bandwidth, non-blocking interconnection to a wide variety of applications including workstations, storage systems, and communications platforms. The PEX 8624 is well suited for fan-out, aggregation, and peer-to-peer applications. High Performance & Low Packet Latency The PEX 8624 architecture supports packet cut-thru with a maximum latency of 145ns (x8 to x8). This, combined with large packet memory 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 max payload size of 2048 bytes, enabling the user to achieve even higher throughput. Data Integrity The PEX 8624 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 as packets pass through the switch. Flexible Register & Port Configuration The PEX 8624's 6 ports can be configured to lane widths of x1, x2, x4, or x8. Flexible buffer allocation, along with the device's flexible packet flow control, maximizes throughput for applications where more traffic flows in the downstream, rather than upstream, direction. Any port can be designated as the upstream port, which x4 x8 can be changed dynamically. The PEX 8624 also provides several ways to configure its registers. The device can be PEX 8624 PEX 8624 configured through strapping pins, I2C interface, host software, or an optional x4 x4 x4 x4 5 x4 serial EEPROM. This allows x8 x8 for easy debug during the development phase, performance monitoring PEX 8624 during the operation phase, PEX 8624 and driver or software upgrade. Figure 1 shows some of the PEX 8624's x8 x4 x4 x8 x8 common port configurations. Figure 1. Common Port Configurations PEX 8624 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 - Non-blocking switch fabric - Full line rate on all ports - Packet Cut-Thru with 145ns max packet latency (x8 to x8) - 2KB Max Payload Size - Read Pacing (bandwidth throttling) - Dual-Cast o Flexible Configuration - Ports configurable as x1, x2, x4, x8 - Registers configurable with strapping pins, EEPROM, I2C, or host software - Lane and polarity reversal - Compatible with PCIe 1.0a PM o Dual-Host & Fail-Over Support - Configurable Non-Transparent port - Moveable upstream port - Crosslink port capability o Quality of Service (QoS) - Eight traffic classes per port - Weighted round-robin source port arbitration o Reliability, Availability, Serviceability - 3 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 - Performance Monitoring * Per port payload & header counters - JTAG AC/DC boundary scan Preliminary - PLX Confidential Dual-Host & Failover Support The PEX 8624 product supports a Non-Transparent (NT) Port, which enables the implementation of multihost systems in communications, storage, and blade server applications. Secondary Secondary Primary Primary Host Host Host Host The NT port CPU CPU allows systems to Blade Blade isolate host memory domains Non-Transparent Port by presenting the processor I/O subsystem as an endpoint rather NT I/O than another PEX 8624 memory system. I/O Base address Figure 2. Non-Transparent Port registers are used to translate addresses; doorbell registers are used to send interrupts between the address domains; and scratchpad registers (accessible by both CPUs) allow interprocessor communication (see Figure 2). Dual Cast The PEX 8624 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 dual-graphics, storage, security, and redundant applications. Read Pacing The Read Pacing feature allows users to throttle the amount of read requests being made by downstream devices. When 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. Hot Plug for High Availability Hot plug capability allows users to replace hardware modules and perform maintenance without powering down the system. The PEX 8624 hot plug capability feature makes it suitable for High Availability (HA) applications. Three downstream ports include a Standard Hot Plug Controller. If the PEX 8624 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 8624 is equipped with a hot-plug control/status register to support hot-plug capability through external logic via the I2C interface. SerDes Power and Signal Management The PEX 8624 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 management of the entire system. Interoperability The PEX 8624 is designed to be fully compliant with the PCI Express Base Specification r2.0, and is backwards compatible to PCI Express Base Specification r1.1 and r1.0a. Additionally, it supports auto-negotiation, lane reversal, and polarity reversal. Furthermore, the PEX 8624 is designed for Microsoft Vista compliance. All PLX switches undergo thorough interoperability testing in PLX's Interoperability Lab and compliance testing at the PCI-SIG plug-fest. Applications & Usage Models Suitable for host-centric as well as peer-to-peer traffic patterns, the PEX 8624 can be configured for a broad range of form factors and applications. Host Centric Fan-out The PEX 8624, with its symmetric or asymmetric lane configuration capability, allows user-specific tuning to a variety of host-centric applications. Figure 3 shows a typical workstation 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 8624 has an 8-lane upstream port, and four downstream ports using x4 links. The PEX 8624 can also be used to create PCIe Gen1 (2.5 Gbps) ports. The PEX 8624 is backwards compatible with PCIe Gen1 devices. Therefore, the PEX 8624 enables a Gen 2 native Chip Set to fan-out to Gen 1 endpoints. In Figure 3, the PCIe slots connected to the PEX 8624's downstream ports can be populated with either PCIe Gen1 or PCIe Gen 2 devices. Conversely, the PEX 8624 can also be used to create Gen 2 ports on a Gen 1 native Chip Set in the same fashion. Preliminary - PLX Confidential CPU CPU CPU CPU I/O Blades Switch Fabric Chipset Endpoint Memory x16 x16 x8 PEX 8624 Endpoint x4 x4 x4 x4 NT PEX 8624 Backplane PCIe Gen1 or PCIe Gen2 slots Figure 3. Fan-in/out Usage Advanced Mezzanine Cards The PEX 8624's fan-out capabilities can be utilized on Advanced Mezzanine Cards (AMC) for I/O expansion. In the example shown below in Figure 4, the PEX 8624 is used on a Quad-Port Network Interface Card (NIC) in an AMC form factor. The PEX 8624 uses a x8 upstream link to the host and four x4 downstream links to to fanout to the four MAC/PHY controllers. 10GE 10GE 10GE 10GE MAC/PHY MAC/PHY MAC/PHY MAC/PHY Figure 5. Bladed Embedded System Failover Storage Systems with Dual Cast The PEX 8624's Dual Cast feature proves to be very useful in storage systems. In the example shown in Figure 6, the Dual Cast feature enables the PEX 8624 to copy data coming from the host to two downstream ports (see yellow traffic patterns) in one transaction as opposed to having to execute two separate transactions to send data to the redundant chassis. By offloading the task of backing up data onto the secondary system, processor and system performance is enhanced. The PEX 8624's NT port is used to isolate the backup system from the primary system. CPU CPU CPU CPU CPU CPU CPU CPU x4 x4 x8 x4 x4 Backup System PEX 8624 Chipset x8 Memory Chipset x8 Memory Figure 4. Quad-Port 10GE NIC AMC PEX 8624 x8 NT PEX 8624 x4 x4 x4 Embedded Systems The PEX 8624 is well suited for embedded applications as well. Embedded applications, like the example shown in Figure 5, commonly use a number of independent modules for functions such as control plane processing, data acquisition, or image processing to name a few possibilities. Figure 5 represents a bladed embedded system utilizing a PEX 8624 to fan-out to the I/O Modules. The PEX 8624's NT port isolates the processors on the two switch fabrics. x4 NT NT PEX 8616 x4 FC Control PEX 8616 x4 FC Control x4 FC Control x4 FC Control 8 Disk Chassis 8 Disk Chassis Figure 6. Dual Cast in Storage Systems Preliminary - PLX Confidential Software Usage Model From a system model viewpoint, each PCI Express port is a virtual PCI to PCI bridge device and has its own set of PCI Express configuration registers. It is through the upstream port that the BIOS or host can configure the other ports using standard PCI enumeration. The virtual PCI to PCI bridges within the PEX 8624 are compliant to the PCI and PCI Express system models. The Configuration Space Registers (CSRs) in a virtual primary/secondary PCI to PCI bridge are accessible by type 0 configuration cycles through the virtual primary bus interface (matching bus number, device number, and function number). Interrupt Sources/Events The PEX 8624 switch supports the INTx interrupt message type (compatible with PCI 2.3 Interrupt signals) or Message Signaled Interrupts (MSI) when enabled. Interrupts/messages are generated by PEX 8624 for hot plug events, doorbell interrupts, baseline error reporting, and advanced error reporting. Development Tools PLX offers hardware and software tools to enable rapid customer design activity. These tools consist of a hardware module (PEX 8624 RDK), hardware documentation (available at www.plxtech.com), and a Software Development Kit (also available at www.plxtech.com). ExpressLane PEX 8624 RDK The PEX 8624 RDK is a hardware module containing the PEX 8624 which plugs right into your system. The PEX 8624 RDK can be used to test and validate customer software, or used as an evaluation vehicle for PEX 8624 features and benefits. The PEX 8624 RDK provides everything that a user needs to get their hardware and software development started. For more information, please refer to the PEX 8624 RDK Product Brief. Software Development Kit (SDK) PLX's Software Development Kit is available for download at www.plxtech.com/sdk. The software development kit includes drivers, source code, and GUI interfaces to aid in configuring and debugging the PEX 8624. For more information, please refer to the PEX 8624 RDK Product Brief. Product Ordering Information PLX Technology, Inc. 870 Maude Ave. Sunnyvale, CA 94085 USA Tel: 1-800-759-3735 Tel: 1-408-774-9060 Fax: 1-408-774-2169 Email: info@plxtech.com Web Site: www.plxtech.com Part Number PEX8624-AA50BC G PEX8624-AA RDK Description 24-Lane, 6-Port PCI Express Switch, Pb-Free (19x19mm2) PEX 8624 Rapid Development Kit Please visit the PLX Web site at http://www.plxtech.com or contact PLX sales at 408-774-9060 for sampling. (c) 2007 PLX Technology, Inc. All rights reserved. PLX and the PLX logo are registered trademarks of PLX Technology, Inc. ExpressLane is a trademark of PLX Technology, Inc., which may be registered in some jurisdiction. 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 Technology, Inc. assumes no responsibility for any errors that may appear in this material. PLX Technology, Inc. reserves the right, without notice, to make changes in product design or specification. PEX8624-SIL-PB-P1-0.8 09/07 Preliminary - PLX Confidential |
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