PARALLEL PORT....................................................................................................................................................75
IBM XT/AT COMPATIBLE, BI-DIRECTIONAL AND EPP MODES ..................................................................76
EXTENDED CAPABILITIES PARALLEL PORT.................................................................................................80
PARALLEL PORT FLOPPY DISK CONTROLLER...........................................................................................91
FDC SWAP BIT..........................................................................................................................................................91
FLOPPY ON PARALLEL PORT PIN....................................................................................................................93
POWER MANAGEMENT.......................................................................................................................................94
SERIAL IRQ ..............................................................................................................................................................97
TIMING DIAGRAMS FOR SER_IRQ CYCLE....................................................................................................97
8042 KEYBOARD CONTROLLER DESCRIPTION .........................................................................................100
LATCHES ON KEYBOARD AND MOUSE IRQS..........................................................................................................106
KEYBOARD AND MOUSE PME GENERATION ..........................................................................................................107
GENERAL PURPOSE I/O.....................................................................................................................................109
GPIO PINS.............................................................................................................................................................109
EITHER EDGE TRIGGERED INTERRUPTS..................................................................................................114
LED FUNCTIONALITY .......................................................................................................................................114
WATCH DOG TIMER..........................................................................................................................................114
SYSTEM MANAGEMENT INTERRUPT (SMI) ................................................................................................115
PME SUPPORT.......................................................................................................................................................117
‘WAKE ON SPECIFIC KEY’ OPTION...............................................................................................................118
FAN SPEED CONTROL AND MONITORING..................................................................................................120
FAN SPEED CONTROL ...........................................................................................................................................120
FAN TACHOMETER INPUTS ....................................................................................................................................121
SECURITY FEATURE ..........................................................................................................................................124
GPIO DEVICE DISABLE REGISTER CONTROL.......................................................................................................124
DEVICE DISABLE REGISTER ..................................................................................................................................124
GAME PORT LOGIC ............................................................................................................................................124
POWER CONTROL REGISTER ................................................................................................................................126
VREF PIN ..............................................................................................................................................................126
ISA IRQ TO SERIAL IRQ CONVERSION CAPABILITY...............................................................................127
RUNTIME REGISTERS........................................................................................................................................128
CONFIGURATION ................................................................................................................................................151
OPERATIONAL DESCRIPTION.........................................................................................................................168
MAXIMUM GUARANTEED RATINGS*............................................................................................................168
DC ELECTRICAL CHARACTERISTICS..........................................................................................................168
TIMING DIAGRAMS ..............................................................................................................................................171
SMSC LPC47B27x
- 5 -
Rev. 08-10-04
DATASHEET
SMSC [ SMSC CORPORATION ]
