1 of 2 february 8, 2007 ? 2007 integrated device technology, inc. idt and the idt logo are trademarks of integrated device technology, inc. device overview the 89HPES24N3A is a member of the idt precise? family of pci express? switching solutions offering the next-generation i/o inter- connect standard. the pes24n3a is a 24-lane, 3-port peripheral chip that performs pci express packet switching with a feature set optimized for high performance applications such as servers, storage, and commu- nications/networking. it provides high-performance i/o connectivity and switching functions between a pci express upstream port and two downstream ports or peer-to-peer sw itching between downstream ports. the 89HPES24N3A offers an enhanced architecture and feature set in a package that is pin-compatible with the first generation 89hpes24n3 24-lane, 3-port pcie switch. features high performance pci express switch ? twenty-four 2.5 gbps pci express lanes ? three switch ports ? upstream port configurable up to x8 ? downstream ports configurable up to x8 ? low-latency cut-through switch architecture ? support for max payload size up to 2048 bytes ? one virtual channel ? eight traffic classes ? pci express base specification revision 1.1 compliant flexible architecture with numerous configuration options ? automatic per port link width negotiation to x8, x4, x2 or x1 ? automatic lane reversal on all ports ? automatic polarity inversion on all lanes ? ability to load device configuration from serial eeprom legacy support ? pci compatible intx emulation ? bus locking highly integrated solution ? requires no external components ? incorporates on-chip internal memory for packet buffering and queueing ? integrates twenty-four 2.5 gbps embedded serdes with 8b/ 10b encoder/decoder (no separate transceivers needed) reliability, availability, an d serviceability (ras) features ? supports ecrc and advanced error reporting ? internal end-to-end parity protection on all tlps ensures data integrity even in systems that do not implement end-to-end crc (ecrc) ? supports pci express native hot-plug, hot-swap capable i/o ? compatible with hot-plug i/o expanders used on pc and server motherboards block diagram figure 1 internal block diagram 24 pci express lanes x8 upstream port and two x8 downstream ports serdes phy logical layer serdes phy logical layer serdes phy logical layer ... multiplexer / demultiplexer 3-port switch core frame buffer route table port arbitration scheduler transaction layer data link layer serdes phy logical layer serdes phy logical layer serdes phy logical layer ... multiplexer / demultiplexer transaction layer data link layer serdes phy logical layer serdes phy logical layer serdes phy logical layer ... multiplexer / demultiplexer transaction layer data link layer 89HPES24N3A product brief 24-lane 3-port pci express? switch
2 of 2 february 8, 2007 idt corporate headquarters 6024 silver creek valley road san jose, ca 95138 for sales: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com for tech support: email: ssdhelp@idt.com phone: 408-284-8208 power management ? utilizes advanced low-power design techniques to achieve low typical power consumption ? supports pci power management interface specification (pci-pm 1.1) ? supports device power management states: d0, d3 hot and d3 cold ? unused serdes are disabled testability and debug features ? ability to read and write any internal register via the smbus eight general purpose input/output pins ? each pin may be individually configured as an input or output ? each pin may be individually configured as an interrupt input ? some pins have selectable alternate functions packaged in 27x27mm 420 ball bga with 1mm ball spacing product description utilizing standard pci express interconnect, the pes24n3a provides the most efficient high-performance i/o connectivity solution for applica- tions requiring high throughput, low latency, and simple board layout with a minimum number of board layers. it provides 12 gbps (96 gbps) of aggregated, full-duplex switching capacity through 24 integrated serial lanes, using proven and robust idt technology. each lane provides 2.5 gbps of bandwidth in both directions and is compliant with pci express base specification 1.1. the pes24n3a is based on a flexible and efficient layered architec- ture. the pci express layers consist of serdes, physical, data link and transaction layers. the pes24n3a can operate either as a store and forward switch or a cut-through switch depending on the packet size and is designed to switch memory and i/o transactions. it supports eight traffic classes (tcs) and one virtual channel (vc) with sophisticated resource management. this includes system selectable algorithms such as round robin, weighted round-robin, and strict priority schemes guar- anteeing bandwidth allocation and/or latency for critical traffic classes in applications such as high throughput 10 gigabit i/os, sata controllers, and fibre channel hbas. figure 2 i/o expansion application memory memory memory processor memory north bridge pes24n3a pes24n3a pes24n3a i/o 10gbe i/o 10gbe i/o sata i/o sata pci express slots
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