pex8524 PLX, pex8524 Datasheet

pex8524

Manufacturer Part Number

pex8524

Description

Flexible

Manufacturer

PLX

Datasheet

1.PEX8524.pdf (4 pages)

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Features

PEX 8524 General Features

o 24-lane PCI Express switch

o Up to six configurable ports

o 31mm x31mm, 644 pin PBGA package

o Typical Power: 3.9 Watts

PEX 8524 Key Features

o Standard Compliant

o High Performance

o Non-Transparent Bridging

o Flexible Configuration

o PCI Express Power Management

o Quality of Service (QoS)

o Reliability, Availability,

- Integrated SerDes

- PCI Express Base Specification, r1.1

- Non-blocking switch fabric

- Full line rate on all ports

- Configurable Non-Transparent port

- Six highly flexible & configurable

- Configurable with strapping pins,

- Lane and polarity reversal

- Link power management states: L0,

- Device states: D0 and D3hot

- Two Virtual Channels per port

- Eight Traffic Classes per port

- Fixed and Round-Robin Virtual

Serviceability

- 6 Standard Hot-Plug Controllers

- Upstream port as hot-plug client

- Transaction Layer end-to-end CRC

- Poison bit

- Advanced Error Reporting

- Lane Status bits and GPO available

- Per port performance monitoring

- JTAG boundary scan

for Multi-Host or Intelligent I/O

Support

ports (x1, x2, x4, x8, or x16)

EEPROM, or Host software

L0s, L1, L2/L3 Ready, and L3

Channel Port Arbitration

N Average packet size

N Number of packets

N CRC errors and more

Version 1.4 2007

x x x x x x x x

Multi-purpose, Feature Rich ExpressLane™ PCI Express Switch

The ExpressLane

enabling users to add scalable high bandwidth, non-blocking interconnection to a

wide variety of applications including servers, storage systems, communications

platforms, blade servers, and embedded-control products. The PEX 8524 is well

suited for fan-out, aggregation, dual-graphics, peer-to-peer, and intelligent I/O

module applications.

Highly Flexible Port Configurations

The ExpressLane PEX 8524 offers highly configurable ports. There are a maximum

of 6 ports that can be configured to any legal width from x1 to x16, in any

combination to support your specific bandwidth needs. The ports can be configured

for symmetric (each port having the same lane width and traffic load) or

asymmetric (ports having different lane widths) traffic. In the event of asymmetric

traffic, the PEX 8524 features a flexible central packet memory that allocates a

memory buffer for each port as required by the application or endpoint. This buffer

allocation along with the device's flexible packet flow control minimizes

bottlenecks when the upstream and aggregated downstream bandwidths do not match

(are asymmetric). Any of the ports can be designated as the upstream port, which can

be changed dynamically.

End-to-end Packet Integrity

The PEX 8524 provides end-to-end CRC protection (ECRC) and Poison bit support

to enable designs that require end-to-end data integrity. These features are optional

in the PCI Express specification, but PLX provides them across its entire

ExpressLane switch product line.

Non-Transparent “Bridging” in a PCI Express Switch

The ExpressLane PEX 8524 product supports full non-transparent bridging (NTB)

functionality to allow implementation of multi-host systems and intelligent I/O

modules in communications, storage, blade server, and graphics fan-out

applications. To ensure quick product migration, the non-transparency features are

implemented in the same fashion as in standard PCI applications.

Non-transparent bridges allow systems to isolate memory domains by presenting the

processor subsystem as an endpoint, rather than another memory system. Base

address registers are used to translate addresses; doorbell registers are used to send

interrupts between the address domains; and scratchpad registers are accessible from

both address domains to allow inter-processor communication.

Two Virtual Channels

The ExpressLane PEX 8524 switch supports 2 full-featured Virtual Channels (VCs)

and a full 8 Traffic Classes (TCs). The mapping of Traffic Classes to port-specific

Virtual Channels allows for different mappings for different ports. In addition, the

devices offer user-selectable Virtual Channel arbitration algorithms to enable users

to fine tune the Quality of Service (QoS) required for a specific application.

Low Power with Granular SerDes Control

The PEX 8524 provides low power capability that is fully compliant with the PCI

Express power management specification. In addition, the SerDes physical links can

be turned off when unused for even lower power.

Flexible & Versatile PCI Express Switch

PEX 8524

PEX 8524 device offers PCI Express switching capability

Related parts for pex8524

pex8524 Summary of contents

Page 1

... The PEX 8524 provides end-to-end CRC protection (ECRC) and Poison bit support to enable designs that require end-to-end data integrity. These features are optional in the PCI Express specification, but PLX provides them across its entire ExpressLane switch product line. Non-Transparent “Bridging” PCI Express Switch ...

Page 2

... SerDes Power and Signal Management The ExpressLane PEX 8524 supports software control of the SerDes outputs to allow optimization of power and signal strength in a system. The PLX SerDes implementation supports four levels of power – off, low, typical, and high. The SerDes block also supports loop-back modes and advanced reporting of error conditions, which enables efficient debug and management of the entire system ...

Page 3

... The PEX 8524 enables designers to take, for example, two x8 PCIe ports and expand them into ten ports. Some of these PCIe ports can be bridged to PCI or PCI-X using bridging products from PLX. Figure 7 illustrates one of the many configurations the PEX 8524 can support. Figure 7. PCIe Port Expansion ...

Page 4

... Software Development Kit (SDK). Figure 8. PEX 8524RDK Product Ordering Information Part Number PLX Technology, Inc. PEX8524-BC25BI 870 Maude Ave. PEX8524-BC25BI G Sunnyvale, CA 94085 USA PEX 8524-BC RDK Tel: 1-800-759-3735 x4 Adapter Tel: 1-408-774-9060 x1 Adapter Fax: 1-408-774-2169 Email: info@plxtech.com Please visit the PLX Web site at Web Site: www ...

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