VT82C686B
Revision 1.71 June 9, 2000
-ii-
Table of Contents
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TABLE OF CONTENTS
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REVISION HISTORY........................................................................................................................................................................I
TABLE OF CONTENTS .................................................................................................................................................................. II
LIST OF FIGURES..........................................................................................................................................................................IV
LIST OF TABLES ...........................................................................................................................................................................IV
OVERVIEW ....................................................................................................................................................................................... 4
PINOUTS ............................................................................................................................................................................................ 6
PIN DIAGRAM................................................................................................................................................................................. 6
PIN LISTS........................................................................................................................................................................................ 7
PIN DESCRIPTIONS......................................................................................................................................................................... 9
REGISTERS ..................................................................................................................................................................................... 27
REGISTER OVERVIEW ................................................................................................................................................................. 27
REGISTER DESCRIPTIONS............................................................................................................................................................ 39
Legacy I/O Ports ................................................................................................................................................................... 39
Keyboard Controller Registers.............................................................................................................................................................. 40
DMA Controller I/O Registers .............................................................................................................................................................. 42
Interrupt Controller Registers ............................................................................................................................................................... 43
Timer / Counter Registers ..................................................................................................................................................................... 43
CMOS / RTC Registers......................................................................................................................................................................... 44
Super-I/O Configuration Index / Data Registers ............................................................................................................... 45
Super-I/O Configuration Registers ..................................................................................................................................... 45
Super-I/O I/O Ports .............................................................................................................................................................. 48
Floppy Disk Controller Registers.......................................................................................................................................................... 48
Parallel Port Registers ........................................................................................................................................................................... 49
Serial Port 1 Registers........................................................................................................................................................................... 50
Serial Port 2 Registers........................................................................................................................................................................... 51
SoundBlaster Pro Port Registers......................................................................................................................................... 52
FM Registers ......................................................................................................................................................................................... 52
Mixer Registers ..................................................................................................................................................................................... 52
Sound Processor Registers .................................................................................................................................................................... 52
Game Port Registers ............................................................................................................................................................. 53
PCI Configuration Space I/O............................................................................................................................................... 54
Function 0 Registers - PCI to ISA Bridge........................................................................................................................... 55
PCI Configuration Space Header .......................................................................................................................................................... 55
ISA Bus Control.................................................................................................................................................................................... 55
Plug and Play Control ........................................................................................................................................................................... 59
Distributed DMA / Serial IRQ Control ................................................................................................................................................. 61
Miscellaneous / General Purpose I/O.................................................................................................................................................... 62
Function 1 Registers - Enhanced IDE Controller .............................................................................................................. 68
PCI Configuration Space Header .......................................................................................................................................................... 68
IDE-Controller-Specific Confiiguration Registers ................................................................................................................................ 70
IDE I/O Registers.................................................................................................................................................................................. 74
Function 2 Registers - USB Controller Ports 0-1 ............................................................................................................... 75
PCI Configuration Space Header .......................................................................................................................................................... 75
USB-Specific Configuration Registers.................................................................................................................................................. 76
USB I/O Registers................................................................................................................................................................................. 77
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