The ExpressLane™ PEX 8748 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, communications, and graphics platforms. The PEX 8748 is well suited for fan-out, aggregation, and peer-to-peer traffic patterns.

Highlights

■ PEX 8748 General Features

o 48-lane, 12-port PCIe Gen 3 switch

- Integrate 8.0 GT/s SerDes d

o 27 x 27mm2, 676-pin FCBGA package

o Typical Power: 8.0 Watts

■ PEX 8748 Key Features

o St ndards Compliant a

- PCI Express Base Specification, r3.0 (compatible w/ PCIe r1.0a/1.1 & 2.0)

- PCI Power Management Spec, r1.2

- Microsoft Vista Compliant

- Supports Access Control Services

- Dynamic link-width control

- Dynamic SerDes speed control

o Hi Performance gh

♦ performancePAK

• Read Pacing (bandwidth throttling)

• Multicast

• Dynamic Buffer/FC Credit Pool

- Non-blocking switch fabric

- Full line rate on all ports

- Packet Cut-Thru with 100ns max packet latency (x16 to x16)

- 2KB Max Payload Size

o Flexible Configuration

- Ports configurable as x1, x2, x4, x8, x16

- Registers configurable with strapping pins, EEPROM, I2C, or host software

- Lane and polarity reversal

- Compatible with PCIe 1.0a PM

o Multi-Host & Fail-Over Support

- Configurable Non-Transparent (NT) port

- Failover with NT port

- Up to 6 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

• Per Port Performance Monitoring

▪ Per port payload & header counters

• SerDes Eye Capture

• PCIe Packet Generator

• Error Injection and Loopback

- 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

- JTAG AC/DC boundary scan