24-Lane 3-Port
PCI Express® Switch
89HPES24N3A
Product Brief
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 switching 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, and 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
3-Port Switch Core
Frame Buffer
Route Table
Port
Arbitration
Scheduler
Transaction Layer
Data Link Layer
Transaction Layer
Data Link Layer
Transaction Layer
Data Link Layer
Multiplexer / Demultiplexer
Phy
Logical
Layer
Phy
Logical
Layer
Phy
Logical
Layer
Multiplexer / Demultiplexer
Phy
Logical
Layer
Phy
Logical
Layer
Phy
Logical
Layer
Multiplexer / Demultiplexer
Phy
Logical
Layer
Phy
Logical
Layer
Phy
Logical
Layer
...
...
...
SerDes
SerDes
SerDes
SerDes
SerDes
SerDes
SerDes
SerDes
SerDes
24 PCI Express Lanes
x8 Upstream Port and Two x8 Downstream Ports
Figure 1 Internal Block Diagram
IDT and the IDT logo are trademarks of Integrated Device Technology, Inc.
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2007 Integrated Device Technology, Inc.
February 8, 2007
IDT
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
◆
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.
Processor
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.
North
Bridge
Memory
Memory
Memory
Memory
PES24N3A
PES24N3A
PES24N3A
PCI Express
Slots
I/O
10GbE
I/O
10GbE
I/O
SATA
I/O
SATA
Figure 2 I/O Expansion Application
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
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