82801AB datasheet(6/414 Pages) INTEL

6 / 414 page

82801AA and 82801AB

Datasheet

Contents

Introduction ................................................................................................................1-1

1.1

About this Manual .........................................................................................1-1

1.2

Overview .......................................................................................................1-3

Signal Description......................................................................................................2-1

2.1

Hub Interface ................................................................................................2-1

2.2

Firmware Hub Interface ................................................................................2-1

2.3

PCI Interface .................................................................................................2-2

2.4

IDE Interface .................................................................................................2-4

2.5

Low Pin Count (LPC) Interface .....................................................................2-5

2.6

Interrupt Interface .........................................................................................2-6

2.7

USB Interface ...............................................................................................2-6

2.8

Power Management Interface.......................................................................2-7

2.9

Processor Interface.......................................................................................2-8

2.10

SMBus Interface ...........................................................................................2-9

2.11

System Management Interface .....................................................................2-9

2.12

Real Time Clock Interface ............................................................................2-9

2.13

Other Clocks ...............................................................................................2-10

2.14

Miscellaneous Signals ................................................................................2-10

2.15

AC’97 Link ..................................................................................................2-10

2.16

General Purpose I/O...................................................................................2-11

2.17

Power and Ground......................................................................................2-12

2.18

Pin Straps ...................................................................................................2-12

2.18.1 Functional Strap.............................................................................2-12

2.18.2 Test Straps ....................................................................................2-13

2.18.3 External RTC Circuitry ...................................................................2-13

2.18.4 5VREF / Vcc3_3 Sequencing Requirements .................................2-14

Power Planes and Pin States ....................................................................................3-1

3.1

Power Planes................................................................................................3-1

3.2

Output and I/O Signal Planes and States .....................................................3-1

3.3

Power Planes for Input Signals.....................................................................3-4

3.4

Integrated Pull-Ups and Pull-Downs.............................................................3-5

3.5

IDE Integrated Series Termination Resistors ...............................................3-5

Clock Domains...........................................................................................................4-1

Functional Description ...............................................................................................5-1

5.1

Hub Interface to PCI Bridge (D30:F0)...........................................................5-1

5.1.1

PCI Bus Interface.............................................................................5-1

5.1.2

PCI-to-PCI Bridge Model .................................................................5-1

5.1.3

IDSEL to Device Number Mapping ..................................................5-2

5.1.4

SERR#/PERR#/NMI# Functionality .................................................5-2

82801AB Datasheet(PDF) 6 Page - Intel Corporation

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