82801FB Datasheet, PDF (3/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Contents
Contents
1 Introduction .............................................................................................................................43
1.2 Overview............................................................................................................................. 46
2 Signal Description.................................................................................................................53
2.1 Direct Media Interface (DMI) to Host Controller.................................................................. 56
2.2 PCI Express* ...................................................................................................................... 56
2.3 Link to LAN Connect ...........................................................................................................57
2.4 EEPROM Interface ............................................................................................................. 57
2.5 Firmware Hub Interface ......................................................................................................57
2.6 PCI Interface ....................................................................................................................... 58
2.7 Serial ATA Interface............................................................................................................ 60
2.8 IDE Interface ....................................................................................................................... 61
2.9 LPC Interface...................................................................................................................... 62
2.10 Interrupt Interface ............................................................................................................... 63
2.11 USB Interface ..................................................................................................................... 64
2.12 Power Management Interface............................................................................................. 65
2.13 Processor Interface............................................................................................................. 67
2.14 SMBus Interface ................................................................................................................. 68
2.15 System Management Interface........................................................................................... 68
2.16 Real Time Clock Interface ..................................................................................................69
2.17 Other Clocks ....................................................................................................................... 69
2.18 Miscellaneous Signals ........................................................................................................ 69
2.19 AC ’97/Intel^® High Definition Audio Link ............................................................................. 70
2.20 General Purpose I/O ...........................................................................................................71
2.21 Power and Ground.............................................................................................................. 73
2.22 Pin Straps ........................................................................................................................... 74
2.22.1 Functional Straps ................................................................................................... 74
2.22.2 External RTC Circuitry ........................................................................................... 76
2.22.3 Power Sequencing Requirements ......................................................................... 76
2.22.3.1 V5REF / Vcc3_3 Sequencing Requirements ......................................... 76
2.22.3.2 3.3 V/1.5 V Standby Power Sequencing Requirements ........................ 76
2.22.3.3 3.3 V/2.5 V Power Sequencing Requirements....................................... 77
2.22.3.4 Vcc1_5/V_Processor_IO Power Sequencing Requirements ................. 77
3 Pin States.................................................................................................................................. 79
3.1 Integrated Pull-Ups and Pull-Downs ................................................................................... 79
3.2 IDE Integrated Series Termination Resistors ..................................................................... 80
3.3 Output and I/O Signals Planes and States ......................................................................... 80
3.4 Power Planes for Input Signals........................................................................................... 89
4 System Clock Domains .......................................................................................................95
5 Functional Description........................................................................................................97
5.1 PCI-to-PCI Bridge (D30:F0) ................................................................................................ 97
5.1.1 PCI Bus Interface................................................................................................... 97
5.1.2 PCI Bridge As an Initiator ...................................................................................... 97
5.1.2.1 Memory Reads and Writes .................................................................... 98
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
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