82801BA Datasheet, PDF (6/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

Contents
1
Introduction ................................................................................................................1-1
1.1 About this Document ....................................................................................1-1
1.2 Overview.......................................................................................................1-3
2
Signal Description......................................................................................................2-1
2.1 Hub Interface to Host Controller ...................................................................2-1
2.2 Link to LAN Connect.....................................................................................2-1
2.3 EEPROM Interface .......................................................................................2-2
2.4 Firmware Hub Interface ................................................................................2-2
2.5 PCI Interface.................................................................................................2-2
2.6 IDE Interface.................................................................................................2-5
2.7 LPC Interface................................................................................................2-6
2.8 Interrupt Interface .........................................................................................2-6
2.9 USB Interface ...............................................................................................2-7
2.10 Power Management Interface.......................................................................2-7
2.11 Processor Interface.......................................................................................2-9
2.12 SMBus Interface .........................................................................................2-10
2.13 System Management Interface...................................................................2-10
2.14 Real Time Clock Interface ..........................................................................2-11
2.15 Other Clocks ...............................................................................................2-11
2.16 Miscellaneous Signals ................................................................................2-11
2.17 AC’97 Link ..................................................................................................2-12
2.18 General Purpose I/O...................................................................................2-12
2.19 Power and Ground......................................................................................2-13
2.20 Pin Straps ...................................................................................................2-14
2.20.1 Functional Straps ...........................................................................2-14
2.20.2 Test Signals ...................................................................................2-15
2.20.2.1 Test Mode Selection.......................................................2-15
2.20.2.2 Test Straps (82801BA ICH2 only) ..................................2-15
2.20.3 External RTC Circuitry ...................................................................2-16
2.20.4 V5REF / Vcc3_3 Sequencing Requirements .................................2-16
3
Power Planes and Pin States ....................................................................................3-1
3.1 Power Planes................................................................................................3-1
3.2 Integrated Pull-Ups and Pull-Downs.............................................................3-1
3.3 IDE Integrated Series Termination Resistors ...............................................3-2
3.4 Output and I/O Signals Planes and States ...................................................3-2
3.5 Power Planes for Input Signals.....................................................................3-6
4
System Clock Domains..............................................................................................4-1
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82801BA ICH2 and 82801BAM ICH2-M Datasheet