VT82C686B
The VT82C686B also enhances the functionality of the standard ISA peripherals. The integrated interrupt controller supports both
edge and level triggered interrupts channel by channel. The integrated DMA controller supports type F DMA in addition to
standard ISA DMA modes. Compliant with the PCI-2.2 specification, the VT82C686B supports delayed transactions and remote
power management so that slower ISA peripherals do not block the traffic of the PCI bus. Special circuitry is built in to allow
concurrent operation without causing dead lock even in a PCI-to-PCI bridge environment. The chip also includes eight levels
(doublewords) of line buffers from the PCI bus to the ISA bus to further enhance overall system performance.
CA
CD
MA/Command
MD
CPU / Cache
North Bridge
System Memory
DIMM Module ID
Sideband Signals:
PCI
Init / CPUreset
IRQ / NMI
SMB
USB Ports 0-3
SMI / StopClk
FERR / IGNNE
SLP# (Slot-1)
Keyboard / Mouse
MIDI / Game Ports
Parallel Port
Expansion
Cards
VT82C686A
352 BGA
Boot ROM
Serial Ports 1 and 2
Infrared Comm Port
RTC
Crystal
IDE Primary and Secondary
Floppy Disk Interface
AC97 Link
Expansion
Cards
Hardware Monitor Inputs
GPIO, Power Control, Reset
ISA
Figure 1. PC System Configuration Using the VT82C686B
Revision 1.71 June 9, 2000
-5-
Overview
ETC [ ETC ]
