Device Overview
PCI Express® switching solutions. The PES22H16G2 is a 22-lane, 16-
port system interconnect switch optimized for PCI Express Gen2 packet
switching in high-performance applications, supporting multiple simulta-
neous peer-to-peer traffic flows. It provides connectivity and switching
functions between a PCI Express upstream port and up to fifteen down-
stream ports and supports switching between downstream ports.
provides the most efficient system interconnect switching solution for
applications requiring high throughput, low latency, and simple board
layout with a minimum number of board layers. Each lane is capable of 5
GT/s of bandwidth in both directions and is fully compliant with PCI
Express Base specification 2.0.
Features
© 2008 Integrated Device Technology, Inc.
The 89HPES22H16G2 is a member of the IDT PRECISE™ family of
Utilizing standard PCI Express Gen2 interconnect, the PES22H16G2
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High Performance Non-Blocking Switch Architecture
– Sixteen maximum switch ports
– Integrated SerDes supports 5.0 GT/s Gen2 and 2.5 GT/s
– Delivers 22 GBps (176 Gbps) of aggregate switching capacity
– Supports up to 128 Bytes to 2 KB maximum payload size
– Low latency cut-through architecture
– Supports one virtual channel and eight traffic classes
– PCI Express Base Specification 2.0 compliant
– Implements the following optional PCI Express features
– x4, x2, and x1 ports
– Automatic per port link width negotiation (x4 --> x2 --> x1)
– Crosslink support
– Automatic lane reversal
Standards and Compatibility
Port Configurability
• Two x4 ports
• Fourteen x1 ports
• Advanced Error Reporting (AER) on all ports
• End-to-End CRC (ECRC)
• Access Control Services (ACS)
• Power Budgeting Enhanced Capability
• Device Serial Number Enhanced Capability
• Sub-System ID and Sub-System Vendor ID Capability
• Internal Error Reporting ECN
• Multicast ECN
• VGA and ISA enable
• L0s and L1 ASPM
• ARI ECN
• Ability to merge adjacent x4 ports to create a x8 port
Gen1 operation
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc.
®
22-Lane 16-Port PCIe® Gen2
System Interconnect Switch
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– Autonomous and software managed link width and speed
– Per lane SerDes configuration
– IDT proprietary feature that creates logically independent
– Supports up to 16 fully independent switch partitions
– Configurable downstream port device numbering
– Supports dynamic reconfiguration of switch partitions
– Supports Root (BIOS, OS, or driver), Serial EEPROM, or
– Common switch configurations are supported with pin strap-
– Supports in-system Serial EEPROM initialization/program-
– Port arbitration
– Request metering
– High performance switch core architecture
– Compliant to the PCI-SIG multicast ECN
– Supports arbitrary multicasting of Posted transactions
– Supports 64 multicast groups
– Multicast overlay mechanism support
– ECRC regeneration support
– Supports 100 MHz and 125 MHz reference clock frequencies
– Flexible port clocking modes
Switch Partitioning
Initialization / Configuration
Quality of Service (QoS)
Multicast
Clocking
• De-emphasis
• Receive equalization
• Drive strength
• Dynamic port reconfiguration — downstream, upstream
• Dynamic migration of ports between partitions
• Movable upstream port within and between switch partitions
• Round robin
• Weighted Round Robin (WRR)
• IDT proprietary feature that balances bandwidth among
• Combined Input Output Queued (CIOQ) switch architecture
• Common clock
• Non-common clock
• Local port clock with SSC and port reference clock input
control
switches in the device
SMBus switch initialization
ping (no external components)
ming
switch ports for maximum system throughput
with large buffers
89HPES22H16G2
Product Brief
September 25, 2008
