XIO2221 datasheet(2/196 Pages) TI1

2 / 196 page

XIO2221

SCPS216A – JULY 2009 – REVISED FEBRAURY 2010

www.ti.com

Contents

Introduction

...................................................................................................................... 13

1.1

XIO2221 Features

......................................................................................................... 13

Overview

.......................................................................................................................... 14

2.1

Description

................................................................................................................. 14

2.2

Related Documents

....................................................................................................... 16

2.3

Documents Conventions

.................................................................................................. 16

2.4

Ordering Information

...................................................................................................... 16

2.5

Terminal Assignments

.................................................................................................... 17

2.6

Terminal Descriptions

..................................................................................................... 21

Feature/Protocol Descriptions

............................................................................................. 28

3.1

Power-Up/Power-Down Sequencing

.................................................................................... 28

3.1.1

Power-Up Sequence

........................................................................................... 29

3.1.2

Power-Down Sequence

........................................................................................ 30

3.2

XIO2221 Reset Features

................................................................................................. 31

3.3

PCI Express (PCIe) Interface

............................................................................................ 32

3.3.1

External Reference Clock

..................................................................................... 32

3.3.2

Beacon and Wake

.............................................................................................. 32

3.3.3

Initial Flow Control Credits

.................................................................................... 32

3.3.4

PCIe Message Transactions

.................................................................................. 33

3.4

PCI Interrupt Conversion to PCIe Messages

.......................................................................... 34

3.5

Two-Wire Serial-Bus Interface

........................................................................................... 35

3.5.1

Serial-Bus Interface Implementation

......................................................................... 35

3.5.2

Serial-Bus Interface Protocol

.................................................................................. 36

3.5.3

Serial-Bus EEPROM Application

............................................................................. 38

3.5.4

Accessing Serial-Bus Devices Through Softwaree

........................................................ 40

3.6

Advanced Error Reporting Registers

................................................................................... 40

3.7

Data Error Forwarding Capability

....................................................................................... 40

3.8

General-Purpose I/O (GPIO) Interface

................................................................................. 41

3.9

Set Slot Power Limit Functionality

....................................................................................... 41

3.10

PCIe and PCI Bus Power Management

................................................................................ 41

3.11

1394b OHCI Controller Functionality

................................................................................... 43

3.11.1

1394b OHCI Power Management

............................................................................ 43

3.11.2

1394b OHCI and V AUX ........................................................................................ 43

3.11.3

1394b OHCI and Reset Options

.............................................................................. 43

3.11.4

1394b OHCI PCI Bus Master

................................................................................. 43

3.11.5

1394b OHCI Subsystem Identification

....................................................................... 44

3.11.6

1394b OHCI PME Support

.................................................................................... 44

Classic PCI Configuration Space

......................................................................................... 45

4.1

Vendor ID Register

........................................................................................................ 46

4.2

Device ID Register

........................................................................................................ 46

4.3

Command Register

........................................................................................................ 46

4.4

Status Register

............................................................................................................ 48

4.5

Class Code and Revision ID Register

.................................................................................. 49

4.6

Cache Line Size Register

................................................................................................ 49

4.7

Primary Latency Timer Register

......................................................................................... 49

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