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VIA
VIA

VT82C686B Datasheet

Super South / South Bridge


VT82C686B Datasheet Preview


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REVISION HISTORY
VT82C686B
Document Release
Revision 1.6
Revision 1.7
Revision 1.71
Date
5/22/00
6/8/00
6/9/00
Revision
Initial release based on 82C686A Data Sheet revision 1.6
“CD/CE” info and “CD-CG”silicon revision comments removed
Added Function 0 Rx8 Revision ID of “2x” for 686B
Added UDMA100 support to title, feature bullets, and overview
Removed external APIC support, added IRQ0 input & internal THRM# output
Updated pin descriptions: MCCS# (U5/U8 select), GPI3, GPI10, GPI11,
GPO6, GPO10, GPO11, GPO21, GPIOC, GPIOD, CHAS, ATEST,
THRM, LID
Updated bit descriptions F0 Rx8,41[6],59,74[7],75[6],76[4-3],77[4],85[7-6]
Updated bit descriptions F1 Rx41[3-0],42,44[4,2],45[4,1-0],46[5-0],4E-4F,
53-50[28,26-24,20-19,12,4-3],54[5,1,0],70[1-0],74-5,78[1-0],7C-D,C0-7
Updated bit descriptions F2/3 Rx43
Updated bit descriptions F4 Rx41[1], 4D[3], 55[2], 57[0], D2[2]
Updated bit descriptions ACPI I/O Rx5-4[8],
Updated bit descriptions SMBus I/O Rx
Updated bit descriptions F5 Rx
Changed Audio / Game / MIDI ports to dedicated pins (SDD removed)
Strap description removed from SPKR pin
Initials
DH
DH
DH
Revision 1.71 June 9, 2000
-i-
Revision History
Page 3

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TABLE OF CONTENTS
VT82C686B
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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
Revision 1.71 June 9, 2000
-ii-
Table of Contents
Page 4
Part Number VT82C686B
Manufactur VIA
Description Super South / South Bridge
Total Page 30 Pages
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