VT82C686B
OVERVIEW
The VT82C686B 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. In addition to complete ISA extension bus functionality, the VT82C686B includes
standard intelligent peripheral controllers:
a) Master mode enhanced IDE controller with dual channel DMA engine and interlaced dual channel commands. Dedicated
FIFO coupled with scatter and gather master mode operation allows high performance transfers between PCI and IDE
devices. In addition to standard PIO and DMA mode operation, the VT82C686B also supports the UltraDMA-33 standard to
allow reliable data transfer rates up to 33MB/sec throughput. The VT82C686B also supports the UltraDMA-66 and
UltraDMA-100 (ATA-100) standards. The IDE controller is SFF-8038I v1.0 and Microsoft Windows-family compliant.
b) Universal Serial Bus controller that is USB v1.1 and Universal HCI v1.1 compliant. The VT82C686B includes the root hub
with four function ports with integrated physical layer transceivers. The USB controller allows hot plug and play and
isochronous peripherals to be inserted into the system with universal driver support. The controller also implements legacy
keyboard and mouse support so that legacy software can run transparently in a non-USB-aware operating system
environment.
c) Keyboard controller with PS2 mouse support.
d) Real Time Clock with 256 byte extended CMOS. In addition to the standard ISA RTC functionality, the integrated RTC also
includes the date alarm, century field, and other enhancements for compatibility with the ACPI standard.
e) Notebook-class power management functionality compliant with ACPI and legacy APM requirements. Multiple sleep states
(power-on suspend, suspend-to-DRAM, and suspend-to-Disk) are supported with hardware automatic wake-up. Additional
functionality includes event monitoring, CPU clock throttling and stop (Intel processor protocol), PCI bus clock stop control,
modular power, clock and leakage control, hardware-based and software-based event handling, general purpose I/O, chip
select and external SMI.
f) Hardware monitoring subsystem for managing system / motherboard voltage levels, temperatures, and fan speeds
g) Full System Management Bus (SMBus) interface.
h) Two 16550-compatible serial I/O ports with infrared communications port option on the second port.
i) Integrated PCI-mastering dual full-duplex direct-sound AC97-link-compatible sound system. Hardware soundblaster-pro and
hardware-assisted FM blocks are included for Windows DOS box and real-mode DOS compatibility. Loopback capability is
also implemented for directing mixed audio streams into USB and 1394 speakers for high quality digital audio.
j) Two game ports and one MIDI port
k) ECP/EPP-capable parallel port
l) Standard floppy disk drive interface
m) Distributed DMA capability for support of ISA legacy DMA over the PCI bus. Serial IRQ is also supported for docking and
non-docking applications.
n) Plug and Play controller that allows complete steerability of all PCI interrupts and internal interrupts / DMA channels to any
interrupt channel. One additional steerable interrupt channel is provided to allow plug and play and reconfigurability of on-
board peripherals for Windows family compliance.
o) Internal I/O APIC (Advanced Programmable Interrupt Controller)
Revision 1.71 June 9, 2000
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Overview
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