PLX Confidential

Software Usage Model

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

virtual PCI to PCI bridge device and has 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 8525 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 PEX 8525 switch supports the INTx interrupt message

type (compatible with PCI 2.3 Interrupt signals) or Message

Signaled Interrupts (MSI) when enabled. Interrupts/messages

are generated by PEX 8525 for hot plug events, doorbell

interrupts, baseline error reporting, and advanced error

reporting.

Development Tools

PLX offers hardware and software tools to enable rapid

customer design activity. These tools consist of a hardware

module (PEX 8525 RDK), hardware documentation, and a

Software Development Kit (SDK).

Figure 8. PEX 8525 RDK

The RDK hardware module includes the PEX 8525 with one

x8 (card-edge slot) port, two x4 ports and one x8 port (see

Figure 8). The RDK is available with a x8 card edge

connector/adapter. The adapters for x4 and x1 edge connectors

are available to plug the RDK in smaller slots. The PEX 8525

RDK board can be installed on a motherboard or used as a

riser card. The PEX 8525 RDK can be used to test and

validate customer software. Additionally, it can be used as an

evaluation vehicle for the PEX 8525 features and benefits. The

PEX 8525 RDK provides everything that a user needs to get

their hardware and software development started.

SDK

The SDK tool set

includes:

- Linux & Windows

drivers

- C/C++ Source code,

Objects, libraries

- User’s Guides &

Application examples

PLX Technology, Inc.

870 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 8525-AA25BI

24-Lane PCI Express Switch (31x31mm

PEX 8525-AA25BI G

24-Lane PCI Express Switch, Pb-Free (31x31mm

PEX 8525-AA RDK

PEX 8525 Rapid Development Kit w/ x8 Edge Connector

© 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.

8525-SIL-PB-P-1.2

01/07

Windows/Linux Apps

PEX API

PCIe

Driver

PnP

Driver

PCI Express Interface

Kernel

Space

User

Space

Hardware

Windows/Linux Apps

PEX API

PCIe

Driver

PnP

Driver

PCI Express Interface

Kernel

Space

User

Space

Hardware

HD Power

Connector

Port 1 – x8

PERST#

Midbus Site

(Upstream Port)

Midbus Site

PORT 8 - X8

PORT 10 - X4

PORT 9 - X4

Port 8 Status LED

Manual

Reset

HotPlug

Ckt

RefClk

EEPROM

EEPROM

EEPROM

EEPROM

PEX 8525

PEX 8525

Port 10 Status LED

Port 9 Status LED

DIP Switch

for Config

DIP Switch

for Config

DIP Switch

for Config

DIP Switch

for Config

JTAG

JTAG

JTAG

JTAG