82801BA datasheet(9/498 Pages) INTEL

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82801BA ICH2 and 82801BAM ICH2-M

Datasheet

5.11

Processor Interface (D31:F0)......................................................................5-66

5.11.1 Processor Interface Signals ...........................................................5-66

5.11.1.1 A20M# ............................................................................5-66

5.11.1.2 INIT#...............................................................................5-66

5.11.1.3 FERR#/IGNNE# (Coprocessor Error).............................5-67

5.11.1.4 NMI .................................................................................5-67

5.11.1.5 STPCLK# and CPUSLP# Signals ..................................5-68

5.11.1.6 CPUPWRGOOD Signal..................................................5-68

5.11.2 Dual Processor Issues (82801BA ICH2 only) ................................5-68

5.11.2.1 Signal Differences (82801BA ICH2 only) .......................5-68

5.11.2.2 Power Management (82801BA ICH2 only) ....................5-68

5.11.3 Speed Strapping for Processor......................................................5-69

5.12

Power Management (D31:F0).....................................................................5-71

5.12.1 ICH2 and System Power States ....................................................5-72

5.12.2 System Power Planes....................................................................5-74

5.12.3 ICH2 Power Planes........................................................................5-74

5.12.4 SMI#/SCI Generation .....................................................................5-74

5.12.5 Dynamic Processor Clock Control .................................................5-77

5.12.5.1 Throttling Using STPCLK# .............................................5-78

5.12.5.2 Transition Rules Among S0/Cx and Throttling States ....5-78

5.12.6 Dynamic PCI Clock Control (82801BAM ICH2-M) .........................5-79

5.12.6.1 Conditions for Stopping the PCI Clock

(82801BAM ICH2-M) ......................................................5-79

5.12.6.2 Conditions for Maintaining the PCI Clock

(82801BAM ICH2-M) ......................................................5-79

5.12.6.3 Conditions for Stopping the PCI Clock

(82801BAM ICH2-M) ......................................................5-79

5.12.6.4 Conditions for Re-Starting the PCI Clock

(82801BAM ICH2-M) ......................................................5-80

5.12.6.5 Other Causes of CLKRUN# Going Active

(82801BAM ICH2-M) ......................................................5-80

5.12.6.6 LPC Devices and CLKRUN# (82801BAM ICH2-M) .......5-80

5.12.7 Sleep States...................................................................................5-81

5.12.7.1 Initiating Sleep State.......................................................5-81

5.12.7.2 Exiting Sleep States .......................................................5-81

5.12.7.3 Sx–G3–Sx, Handling Power Failures .............................5-83

5.12.8 Thermal Management....................................................................5-84

5.12.8.1 THRM# Signal ................................................................5-84

5.12.8.2 THRM# Initiated Passive Cooling...................................5-84

5.12.8.3 THRM# Override Software Bit ........................................5-84

5.12.8.4 Processor-Initiated Passive Cooling

(Via Programmed Duty Cycle on STPCLK#)..................5-85

5.12.8.5 Active Cooling.................................................................5-85

5.12.9 Intel® SpeedStep™ Technology Protocol

(82801BAM ICH2-M only)..............................................................5-85

5.12.9.1 Intel® SpeedStep™ Technology Processor

Requirements (82801BAM ICH2-M)...............................5-86

5.12.9.2 Intel® SpeedStep™ Technology States

(82801BAM ICH2-M) ......................................................5-86

5.12.9.3 Voltage Regulator Interface (82801BAM ICH2-M) .........5-87

82801BA Datasheet(PDF) 9 Page - Intel Corporation

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