4
EPP 1.7 Operation....................................................................................................................... 97
Extended Capabilities Parallel Port............................................................................................... 99
Vocabulary .................................................................................................................................100
ECP Implementation Standard....................................................................................................101
PARALLEL PORT FLOPPY DISK CONTROLLER.........................................................................112
FDC on Parallel Port Pin.............................................................................................................113
POWER MANAGEMENT ...............................................................................................................114
FDC Power Management............................................................................................................114
DSR From Powerdown ...............................................................................................................114
Wake Up From Auto Powerdown ................................................................................................114
Register Behavior .......................................................................................................................114
Pin Behavior...............................................................................................................................115
UART Power Management..........................................................................................................117
Parallel Port................................................................................................................................117
MPU-401 Power Management.....................................................................................................117
SERIAL IRQ...................................................................................................................................118
ISA IRQ TO SERIAL IRQ CONVERSION CAPABILITY...............................................................122
8042 KEYBOARD CONTROLLER DESCRIPTION.........................................................................123
Keyboard Interface......................................................................................................................124
External Keyboard and Mouse Interface......................................................................................125
Keyboard Power Management ....................................................................................................125
Interrupts....................................................................................................................................126
Memory Configurations...............................................................................................................126
Register Definitions.....................................................................................................................126
External Clock Signal..................................................................................................................127
Default Reset Conditions.............................................................................................................127
Latches On Keyboard and Mouse IRQs.......................................................................................130
Keyboard and Mouse Wake-up...................................................................................................131
GENERAL PURPOSE I/O ..............................................................................................................133
GPIO Pins..................................................................................................................................133
Description .................................................................................................................................134
GPIO Control..............................................................................................................................135
GPIO Operation..........................................................................................................................137
GPIO PME and SMI Functionality...............................................................................................138
Either Edge Triggered Interrupts .................................................................................................140
LED Functionality .......................................................................................................................140
Watch Dog Timer .......................................................................................................................140
SYSTEM MANAGEMENT INTERRUPT (SMI)................................................................................142
SMI Registers.............................................................................................................................142
ACPI Support Register for SMI Generation..................................................................................143
PME SUPPORT .............................................................................................................................144
WAKE ON SPECIFIC KEY OPTION ...........................................................................................146
FAN SPEED CONTROL AND MONITORING.................................................................................147
Fan Speed Control......................................................................................................................147
Fan Tachometer Input.................................................................................................................148
SECURITY FEATURE....................................................................................................................153
GPIO Device Disable Register Control........................................................................................153
Device Disable Register..............................................................................................................153
GAME PORT LOGIC .....................................................................................................................154