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© 2007 PLX Technology, Inc. All rights reserved. PLX and the PLX logo are registered trademarks of PLX Technology, Inc. ExpressLane is a trademark of PLX Technology, Inc.,

which may be registered in some jurisdiction. All other product names that appear in this material are for identification purposes only and are acknowledged to be trademarks or

registered trademarks of their respective companies. Information supplied by PLX is believed to be accurate and reliable, but PLX Technology, Inc. assumes no responsibility for

any errors that may appear in this material. PLX Technology, Inc. reserves the right, without notice, to make changes in product design or specification.

8509-SIL-PB-1.2

March 2007

Software Usage Model

From a system model viewpoint, each PCI Express port is a

virtual PCI to PCI bridge device with its own set of PCI

Express configuration registers. It is through the upstream port

that the BIOS or host can configure the other ports using

standard PCI enumeration. The virtual PCI to PCI bridges

within the PEX 8509 are compliant to the PCI and PCI

Express system models. The Configuration Space Registers

(CSRs) in a virtual primary/secondary PCI to PCI Bridge are

accessible by type 0 configuration cycles through the virtual

primary bus interface (matching bus number, device number,

and function number).

Interrupt Sources/Events

The ExpressLane PEX 8509 switch supports the INTx

interrupt message type (compatible with the PCI 2.3 Interrupt

signals) or Message Signaled Interrupts (MSI) when enabled.

Interrupts/messages are generated by the PEX 8509 for hot

plug events, baseline error reporting, and advanced error

reporting.

Development Tools

PLX offers the PEX 8509RDK which includes hardware and

software tools to enable rapid customer design activity. These

tools consist of a hardware module, hardware documentation

and a Software Development Kit (SDK).

The RDK hardware module includes the PEX 8509 with one

upstream x4 port and four downstream x1 ports.

The PEX 8509RDK hardware module can be installed in a

motherboard, used as a riser card, or configured as a bench-top

board.

The PEX 8509RDK can be used to test and validate customer

software. Additionally, it can be used as an evaluation vehicle

for the PEX 8509 features and benefits.

SDK

The SDK tool set includes:

- Linux and Windows drivers

- C/C++ Source code, Objects, libraries

- User’s Guides, Application examples, Tutorial

PLX Technology, Inc.

870 W. Maude Ave.

Sunnyvale, CA 94085 USA

Tel: 1-800-759-3735

Tel: 1-408-774-9060

Fax: 1-408-774-2169

Email: info@plxtech.com

Web Site: www.plxtech.com

Product Ordering Information

Part Number

Description

PEX 8509-AA25BI

8-Lane, 8-port PCI Express Switch

PEX 8509-AA25BI G

8-Lane, 8-port PCI Express Switch Pb-Free

PEX 8509RDK-4

PEX 8509 Rapid Development Kit with x4 connector (5 ports)

PEX 8509RDK-1

PEX 8509 Rapid Development Kit with port expander (8 ports)

Please visit the PLX Web site at www.plxtech.com or contact PLX sales at 408-774-9060 for sampling.

Figure 7. PEX 8509RDK