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82801HB

Intel® I/O Controller Hub 8 (ICH8) Family

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Contents

1 Introduction ............................................................................................................ 45

1.1 Overview ......................................................................................................... 48

1.2 Intel® ICH8 Family High-Level Component Differences ........................................... 55

2 Signal Description ................................................................................................... 57

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10

2.11

2.12

2.13

2.14

2.15

2.16

2.17

2.18

2.19

2.20

2.21

2.22

2.23

2.24

2.25

2.26

Direct Media Interface (DMI) to Host Controller ..................................................... 60

PCI Express* .................................................................................................... 60

LAN Connect Interface ....................................................................................... 61

Gigabit LAN Connect Interface ............................................................................ 61

Firmware Hub Interface...................................................................................... 62

PCI Interface .................................................................................................... 63

Serial ATA Interface........................................................................................... 66

IDE Interface (Mobile Only) ................................................................................ 68

LPC Interface .................................................................................................... 69

Interrupt Interface ............................................................................................ 70

USB Interface ................................................................................................... 71

Power Management Interface.............................................................................. 72

Processor Interface............................................................................................ 75

SMBus Interface................................................................................................ 77

System Management Interface ............................................................................ 77

Real Time Clock Interface ................................................................................... 78

Other Clocks ..................................................................................................... 79

Miscellaneous Signals ........................................................................................ 79

Intel® High Definition Audio Link ......................................................................... 80

Serial Peripheral Interface (SPI) .......................................................................... 81

Intel® Quick Resume Technology (Intel® ICH8DH Only) ......................................... 82

Controller Link .................................................................................................. 82

Intel® Quiet System Technology (Desktop Only) ................................................... 83

General Purpose I/O Signals ............................................................................... 83

Power and Ground ............................................................................................. 86

Pin Straps ........................................................................................................ 88

2.26.1 Functional Straps ................................................................................... 88

2.26.2 External RTC Circuitry ............................................................................. 90

3 Intel® ICH8 Pin States............................................................................................. 91

3.1 Integrated Pull-Ups and Pull-Downs ..................................................................... 91

3.2 IDE Integrated Series Termination Resistors (Mobile Only)...................................... 92

3.3 Output and I/O Signals Planes and States............................................................. 92

3.4 Power Planes for Input Signals .......................................................................... 102

4 Intel® ICH8 and System Clock Domains................................................................. 107

5 Functional Description ........................................................................................... 109

5.1 PCI-to-PCI Bridge (D30:F0) .............................................................................. 109

5.1.1 PCI Bus Interface ................................................................................. 109

5.1.2 PCI Bridge As an Initiator ...................................................................... 109

5.1.2.1

5.1.2.2

5.1.2.3

5.1.2.4

Memory Reads and Writes........................................................ 110

Configuration Reads and Writes ................................................ 110

Locked Cycles ........................................................................ 110

Target / Master Aborts............................................................. 110

5.1.2.5 Secondary Master Latency Timer............................................... 110

5.1.2.6 Dual Address Cycle (DAC) ........................................................ 110

5.1.2.7 Memory and I/O Decode to PCI................................................. 111

5.1.3 Parity Error Detection and Generation ..................................................... 111

Intel® ICH8 Family Datasheet

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