VT82C686B ¦Super South§ South Bridge

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fixed 686B part # in figures 1 & 7 DH Added 1.5V interface note to FERR# and APCD1-0 Removed RTC ports 72-73 and Rx75[6] (and fixed GPO6 description) Fixed Func 1 Rx45[5-4] & default, PM I/O Rx20-25[5], 2A[10] Added Func 2/3/4 Rx6[4]/Rx34, F4Rx68-6F power management capabilities Added Func 4 SMB I/O Rx54, 90-93, D2-D6 and Func 5/6 Rx48[3] Fixed mechanical drawing for proper orientation of marking relative to pin 1 Revision 1.8 8/1/00 Removed Super-I/O “high speed baud rate support” DH Fixed VREF pin direction and voltage, Added F4 Rx55[3] Removed ambient temp spec and added max power dissipation Revision 1.8 August 1, 2000 -i- Revision History 7HFKQRORJLHV ,QF 'HOLYHULQJ 9DOXH VT82C686B TABLE OF CONTENTS 3& &203/,$17 3&,72,6$ %5,'*( .....................................................................................................................................I 7(03(5$785( 92/7$*( $1' )$163((' 021,725,1*..............................................................................................I 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........................................................................................................................................................................................
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