
3
TABLE OF CONTENTS
FEATURES
........................................................................................................................................... 1
GENERAL DESCRIPTION
................................................................................................................. 6
DESCRIPTION OF PIN FUNCTIONS
............................................................................................... 7
BUFFER TYPE DESCRIPTIONS
.................................................................................................... 11
REFERENCE DOCUMENTS
........................................................................................................... 13
FUNCTIONAL DESCRIPTION
......................................................................................................... 14
SUPER
I/O
REGISTERS
............................................................................................................... 14
HOST
PROCESSOR
INTERFACE
.............................................................................................. 14
FLOPPY DISK CONTROLLER....................................................................................................... 16
FDC INTERNAL REGISTERS
................................................................................................. 16
COMMAND SET/DESCRIPTIONS
.......................................................................................... 41
Force Write Protect
.................................................................................................................. 70
SERIAL PORT (UART)
..................................................................................................................... 70
REGISTER DESCRIPTION
...................................................................................................... 70
INFRARED INTERFACE
.................................................................................................................. 88
PARALLEL PORT
............................................................................................................................. 88
IBM XT/AT COMPATIBLE, BI-DIRECTIONAL AND EPP MODES........................................ 90
EXTENDED CAPABILITIES PARALLEL PORT
.......................................................................... 96
PARALLEL
PORT
FLOPPY
DISK
CONTROLLER
.................................................................. 108
POWER MANAGEMENT
................................................................................................................ 110
FDC Power Management
...................................................................................................... 110
UART Power Management
................................................................................................... 115
Parallel Port
.............................................................................................................................. 115
V
BAT
Support
............................................................................................................................ 115
V
TR
Support
.............................................................................................................................. 115
Internal PWRGOOD
................................................................................................................ 116
CIRCC PLL Power Control
................................................................................................... 116
32.768 kHz Standby Clock Output
...................................................................................... 116
BIOS BUFFER
.................................................................................................................................. 121
GENERAL PURPOSE I/O
.............................................................................................................. 123