www.plxtech.com flexible & versatile pci express ? switch . features ? pex 8505 general features o 5-lane pci express switch - gen 1 (2.5gbps) integrated serdes o up to five ports (x1, x2) o 15mm x 15mm, 196-ball pbga pkg. o typical power: 0.8 watts ? pex 8505 key features o standards compliant - pci express base specification, r1.1 - pci power management interface specification r1.2 o high performance - cut-thru with low packet latency - max payload size of 1024 bytes - non-blocking internal architecture - full line rate on all ports o flexible configuration - five flexible & co nfigurable ports (x1, x2) - lane and polarity reversal - configurable with strapping pins, eeprom, i 2 c or host software o pci express power management - link power management states: l0, l0s, l1, l2/l3 ready and l3 - device states: d0 and d3hot o quality of service (qos) - one virtual channel per port - eight traffic classes per port - weighted round-robin ingress port arbitration o reliability, availability, serviceability - three standard hot-plug controllers supporting pci shpc spec r1.0 - transaction layer end-to-end crc - poison bit support - basic and advanced error reporting support - per port error diagnostics ? bad dllps ? bad tlps ? crc errors and more - fatal error (fatal_err#) signal (legacy serr equivalent) - inta# signal - port status bits - eight software controllable general purpose output (gpo) signals - jtag boundary scan low-power 5-lane, 5-port expresslane tm pcie switch the pex 8505 device offers pci express switching capability conforming to the pci express base specification revision 1.1. this device enables users to add scalable high bandwidth, non-blocking interconnects at the lowest cost to a wide variety of applications including communications platforms, consumer products, servers, storage systems, blade servers, industrial systems and embedded-control products. the pex 8505 can be used as a fan-out , or peer-to-peer switch, and is well-suited for control plane applications, i/ o expansion, video surveillance, ulti-function printers, dvrs, industrial contr ol systems, medical imaging s and amc modules. r cks when the upstream and aggregated downstream bandwidths do not uch as docking stations, control planes, s. re ation, but plx provides them across its entire . ing during the operation phase, and driver or software upgrade. sal , o undergoes thorough interoperability physical links can be programmed for desired power or turned off when unused. m systems, embedded system port configurations the pex 8505 offers five lanes and up to five ports supporting x1 and x2 lane widths. the pex 8505 features a flexible central packet memory that allocates a memory buffer for each port as required by the application or endpoint. this buffe allocation along with the device's flexible packet flow control minimizes ottlene b match. high performance the pex 8505 architectur e supports packet cut-thru with low latency (138ns). this, combined with large packet memory (up to 1024 byte maximum payload size) and non-blocking internal switch architecture , provides full line rate on all orts for performance hungry applications s p embedded systems and amc module end-to-end packet integrity the pex 8505 provides end-to-end crc protection (ecrc) and poison-bit support to enable designs that require end-to-end data integrity . these features a ptional in the pci express specific o expresslane switch product line configuration flexibility the pex 8505 provides several ways to configure its operations. the device can be configured through strapping pins, i 2 c interface , cpu configuration cycles, or an ptional serial eeprom. this allows for easy debug during the development phase, o performance monitor interoperability the pex 8505 is designed to be fully compliant with the pci-sig pci express base specification revision 1.1. additionally, it supports auto-negotiation , lane rever nd polarity reversal . the pex 8505 als a testing in plx?s interoperability lab. low power with granular serdes control the pex 8505 provides low power capability that is fully compliant with the pci express power management specification. for even lower power, the serdes version 1.2 2008 pex 8505
port configurations the lane width of each port can be individually configured through auto-negotiation, hardware strapping, host software configuration, i 2 c interface, or through an optional eeprom. the pex 8505 supports three port configurations: 1) one x1 upstream port and four x1 downstream ports 2) one x2 upstream port and three x1 downstream ports 3) one x2 upstream port, one x2 downstream port, one x1 downstream port figure 1. 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 8505 hot-plug capability and advanced error reporting features make it suitable for high availability (ha) applications . ports 1, 2 & 3 include a standard hot- plug controller . if the pex 8505 is used in an application where one or more of its downstream ports connect to pci express slots, hot-plug controllers on the three downstream ports can be used to manage the hot plug event of its associated slot. fully compliant power management for applications that require power management, the expresslane pex 8505 devices support both link (l0, l0s, l1, l2/l3 ready and l3) and device (d0 and d3hot) power management states, in complian ce with the pci express power management specification. serdes power and signal management the expresslane pex 8505 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 arbitration the pex 8505 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 and the system bandwidth. pex 8505 x1 pex 8505 x2 x1 x2 x1 x1 x1 pex 8505 x1 x1 x1 x1 x1 pex 8505 pex 8505 x1 pex 8505 pex 8505 x2 x1 x2 x1 x1 x1 pex 8505 x1 x1 x1 x1 x1 pex 8505 pex 8505 x1 x1 x1 x1 x1 applications suitable for control plane applications, multi-function printers, dvrs, industrial control systems, medical imaging systems, embedded systems & amc modules, the pex 8505 can be configured for a wide variety of form factors and applications. control plane application the pex 8505 is ideal for migrating existing pci control planes in routers to high-speed pci express interface to meet increased packet processing need s. figure 2 shows a controller card with a pex 8505 connecting the control processor to as many as four devices each via a x1 port. this usage model provides connectivity to multiple devices giving the processor control over multiple devices in mid-range routers. pex 8505 control processor fpga asic fpga asic memory pex 8505 control processor fpga asic fpga asic memory figure 2. control plane i/o expansion the pex 8505 can be used in i/o expansion applications. together with a pci express-to-pci bridge, the pex 8505 is capable of providing legacy pci i/o expansion support. each x1 port in the pex 8505 provides 250mb/s bandwidth per direction and it is more than capable of supporting the various bus widths and bus speeds of legacy pci. please visit the www.plxtech.com/bridges for additional information on plx?s pci express bridge family. www.plxtech.com
pex 8505 pci bus pcie sound card pex 8111 via 17242 stereo codec pci bus pex 8111 cvbs 2if conexant cx23882 ts conexant demod cx22702 philips hybrid tuner if pcie tv tuner card south bridge end point pex 8505 pex 8505 pci bus pcie sound card pex 8111 pex 8111 via 17242 via 17242 stereo codec stereo codec pci bus pex 8111 pex 8111 cvbs 2if conexant cx23882 conexant cx23882 ts conexant demod cx22702 conexant demod cx22702 philips hybrid tuner philips hybrid tuner if pcie tv tuner card south bridge figure 3. i/o expansion video surveillance a video surveillance application is another example for an embedded application. when used together with a pex 8311, pci express-to-local bus bridges, the pex 8505 can connect to other embedded devices, such as fpgas. this allows video capture devices to interface to a pci express host taking advantage of the pci express performance. for more information on the pci express-to-local bus bridge, please visit plx?s website at www.plxtech.com/bridges . figure 4. video surveillance printer application in a printer application, low po wer and low latency devices are commonly used. figure 5 shows an example of a printer application. in this example, the low power processor used provides a limited number of pci express ports. the pex 8505 can be used to provide four additional pci express ports for the connectivity of other system peripherals such as ethernet as well any proprietary pci express based asics. the peer-to-peer feature in the pex 8505, allows a peripheral connected on a downstream port the ability to transfer data directly to another peripheral device. as shown in figure 5, the asic connected to the scanner side can transfer data directly to the pcie slot and/or the asic connected on the marking engine side resulting in a low latency data transfer. in this case, the processor is not directly involved in the transfer. pcie slot or cable x1 pex 8505 processor proprietary asic proprietary asic ethernet r marking engine scanne x1 x1 x1 x1 pcie slot or cable x1 pex 8505 processor proprietary asic proprietary asic ethernet r marking engine scanne x1 x1 x1 x1 south bridge end point figure 5. printer engine software usage model from a system model viewpoint, each pci express port is a virtual pci to pci bridge device with 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 8505 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 configurati on cycles through the virtual primary bus interface (matching bus number, device number, and function number). camera camera camera jpeg jpeg fifo fifo fpga fpga cpu cpu camera camera camera pex 8311 pex 8311 pex 8505 control processor . . camera camera camera camera camera camera jpeg jpeg fifo fifo fpga fpga cpu cpu cpu cpu camera camera camera camera camera camera pex 8311 pex 8311 pex 8311 pex 8311 pex 8505 pex 8505 control processor . . interrupt sources/events the expresslane pex 8505 switch supports the intx interrupt message type (compatible with the pci 2.3 interrupt signals) or message signaled interrupts (msi) when enabled. interrupts/messages are generated by the pex 8505 for hot plug events, baseline error re porting, and advanced error reporting. www.plxtech.com
www.plxtech.com development tools plx offers the pex 8505rdk which includes hardware and software tools to enable rapid customer design activity. these tools consist of a hardware module, hardware documentation and a software development kit (sdk). expresslane pex 8505rdk the rdk hardware includes three modules: the pex 8505 base board, the port expander which provides four x1 ports, and a pci express adapter board which provides connection to the host slot. the pex 8505rdk hardware module is configured as a bench-top board to provide five ports. the adapter board routes the pci express signals from the host slot to a standard (pci sig defined) pci express x1 cable connector. the connection between the pex 8505 and the host is made via the x1 cable. the pex 8505rdk can be used to test and validate customer software. additionally, it can be used as an evaluation vehicle for the pex 8505 features and benefits. sdk the sdk tool set includes: - linux and windows drivers - c/c++ source code, objects, libraries - user?s guides, application examples, tutorials port expander pcie x1 cable connector pex 8505rdk j 5 p 1 pex 8505 rdk slot x1 x1 x1 x1 atx atx refclk pwdgd cpwron # cperst # crefclk cprstn # perst# refclk cable adapter board pcie x1 cable connector windows/linux apps pex api pcie driver nt pnp driver pci express interface kernel space user space hardware windows/linux apps pex api pcie driver nt pnp driver pci express interface kernel space user space hardware figure 6. pex 8505rdk product ordering information part number description pex 8505-aa25bi 5-lane, 5-port pci express switch pex 8505-aa25bi g 5-lane, 5-port pci express switch pb-free pex 8505-aa rdk kit pex 8505 rapid development kit base board; x1 pcie cable; x1 pcie cable adapter and rdk port expander please visit the plx web site at http://www.plxtech.com/8505 or contact plx sales at 408-774-9060 for sampling. plx technology, inc. 870 w. maude ave. sunnyvale, ca 94085 usa www.plxtech.com ? 2008 plx technology, inc. all rights reserved. plx and the plx l ogo are registered trademarks of plx technology, inc. express lane 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 purpo ses 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 p lx technology, inc. assumes no responsibility for any errors that may appear in this material. plx technology, in c. reserves the right, without notice, to make changes in produc t design or specification. 8505-sil-pb-1.2 04/08
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