User Guide

Hardware Functional Overview
4-8 FIC A440 Series Service Manual
4.5.2 VT82C686A Features
The VT82C686A PSIPC (PCI Super-I/O Integrated Peripheral Controller) is a high-
integration, high performance, power-efficient, and high compatibility device that supports
Intel and non-Intel based processor to PCI bus bridge functionality to make a complete
Microsoft PC99-compliant PCI/ISA system.
The VT82C686A functions and capabilities include:
•
Inter-operable with VIA and other Host-to-PCI Bridges
- Combine with VT8601 for a complete 66 / 100 / 133 MHz Socket 370 or Slot-1
system with integrated 2D / 3D graphics (Apollo ProMedia)
- Inter-operable with Intel or other Host-to-PCI bridges for a complete PC99
compliant PCI / AGP / ISA system
•
PCI to ISA Bridge
- Integrated ISA Bus Controller with integrated DMA, timer, and interrupt
controller
- Integrated Keyboard Controller with PS2 mouse support
- Integrated DS12885-style Real Time Clock with extended 256 byte CMOS RAM
and Day/Month Alarm for ACPI
- Integrated USB Controller with root hub and four function ports
- Integrated UltraDMA-33/66 master mode EIDE controller with enhanced PCI
bus commands
- PCI-2.2 compliant with delay transaction and remote power management
- Distributed DMA support for ISA legacy DMA across the PCI bus
- Fast reset and Gate A20 operation
- Flash EPROM, 4Mb EPROM and combined BIOS support
- Supports positive and subtractive decoding
•
UltraDMA-33 / 66 Master Mode PCI EIDE Controller
- Dual channel master mode PCI supporting four Enhanced IDE devices
- Transfer rate up to 33MB/sec to cover PIO mode 4, multi-word DMA mode 2
drives, and UltraDMA-33 interface
- Support ATAPI compliant devices including DVD devices
- Support PC native and ATA compatibility modes
- Complete software driver support
•
Integrated Super IO Controller
- Supports 2 serial ports, IR port, parallel port, and floppy disk controller functions
- Two UARTs for Complete Serial Ports
- Infrared-IrDA (HPSIR) and ASK (Amplitude Shift Keyed) IR port multiplexed
on COM2
- Multi-mode parallel port
- Floppy Disk Controller
•
SoundBlaster Pro Hardware and Direct Sound Ready AC97 Digital Audio Controller
- Dual full-duplex Direct Sound channels between system memory and AC97 link
- PCI master interface with scatter / gather and bursting capability
- 32 byte FIFO of each direct sound channel
- Standard v1.0 or v2.0 AC97 Codec interface for single or cascaded AC97
Codec’s from multiple vendors
- Loopback capability for re-directing mixed audio streams into USB and 1394
speakers
- Hardware SoundBlaster Pro for Windows DOS box and real-mode DOS legacy
compatibility