IDT 89HPES34H16, User Manual, Page: 19 / 182

Notes
PES34H16 User Manual 1 - 1 October 30, 2008
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Chapter 1
PES34H16 Device Overview
Introduction
The 89HPES34H16 is a member of the IDT PRECISE™ family of PCI Express® switching solutions.
The PES34H16 is a 34-lane, 16-port peripheral chip that performs PCI Express packet switching with a
feature set optimized for high-performance applications such as servers, storage, and communications/
networking. It provides connectivity and switching functions between a PCI Express upstream port and up
to fifteen downstream ports and supports switching between downstream ports.
List of Features
– Sixteen maximum switch ports
• Up to three x8 ports that bifurcate up to six x4 ports
• Ten x1 ports
– Thirty-four 2.5 Gbps embedded SerDes
• Supports pre-emphasis and receive equalization on per-port basis
– Low-latency cut-through switch architecture
– Support for Max Payload Size up to 2048 bytes
– Supports two virtual channels and eight traffic classes
– PCI Express Base Specification Revision 1.1 compliant

Flexible Architecture with Numerous Configuration Options
– Port arbitration schemes utilizing round robin algorithms
– Automatic per port link width negotiation from x8 to x4 to x2 or x1
– Automatic lane reversal on all ports
– Automatic polarity inversion on all lanes
– Supports locked transactions, allowing use with legacy software
– Ability to load device configuration from serial EEPROM
– Ability to control device via SMBus

Highly Integrated Solution
– Requires no external components
– Incorporates on-chip internal memory for packet buffering and queueing
– Integrates thirty-four 2.5 Gbps embedded full duplex SerDes, 8B/10B encoder/decoder (no sepa-
rate transceivers needed)

Reliability, Availability, and Serviceability (RAS) Features
– Redundant upstream port failover capability
– Supports optional PCI Express end-to-end CRC checking