82801BA datasheet(6/498 Pages) INTEL

6 / 498 page

82801BA ICH2 and 82801BAM ICH2-M

Datasheet

Contents

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

1.1

About this Document ....................................................................................1-1

1.2

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

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

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

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

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