4
LED Functionality........................................................................................................................140
WATCH DOG TIMER .....................................................................................................................141
SYSTEM MANAGEMENT INTERRUPT (SMI).................................................................................141
SMI Registers..............................................................................................................................142
ACPI Support Register for SMI Generation...................................................................................143
PME SUPPORT..............................................................................................................................143
WAKE ON SPECIFIC KEY OPTION...............................................................................................145
FAN SPEED CONTROL AND MONITORING..................................................................................146
Fan Speed Control ......................................................................................................................146
Fan Tachometer Input .................................................................................................................147
SECURITY FEATURE....................................................................................................................151
GPIO Device Disable Register Control.........................................................................................151
Device Disable Register...............................................................................................................151
SMBus CONTROLLER..................................................................................................................151
Overview.....................................................................................................................................151
Configuration Registers ...............................................................................................................152
Runtime Registers.......................................................................................................................152
Pin Multiplexing...........................................................................................................................159
SMBus Timeouts.........................................................................................................................159
RUNTIME REGISTERS..................................................................................................................160
Runtime Registers Block Summary..............................................................................................160
Runtime Registers Block Description............................................................................................164
CONFIGURATION..........................................................................................................................196
OPERATIONAL DESCRIPTION .....................................................................................................221
Maximum Guaranteed Ratings.....................................................................................................221
DC Electrical Characteristics........................................................................................................221
TIMING DIAGRAMS.......................................................................................................................225
ECP Parallel Port Timing.............................................................................................................236
PACKAGE OUTLINE .....................................................................................................................249
APPENDIX - TEST MODES............................................................................................................250
Board Test Mode.........................................................................................................................250
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