VT8231 datasheet(11/132 Pages) ETC

11 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-5-

Overview

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OVERVIEW

The VT8231 South Bridge is a high integration, high performance, power-efficient, and high compatibility device that supports

Intel, AMD, and VIA / Cyrix based processor to PCI bus bridge functionality to make a complete Microsoft PC99-compliant PCI /

LPC system. The VT8231 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 VT8231 also supports the UltraDMA-33, 66, and 100

standards to allow reliable data transfer rates up to 100 MB/sec throughput. The IDE controller is SFF-8038i v1.0 and

Microsoft Windows-family compliant.

b) Integrated LAN Fast Ethernet controller (MAC) with Media Independent Interface (MII) to external PHY.

The LAN

controller operates at 1 / 10 / 100 Mbit/sec transfer rates using either full and half duplex operation and has separate 2Kbyte

FIFOs for receive and transmit of full ethernet packets. The internal high-performance PCI interface has scatter / gather and

bursting capability and can align bytes in the transmit data buffer to reduce CPU utilization. The LAN interface can perform

address filtering on physical, broadcast, and multicast packets. The interface can also be configured for system wake up on

link status change, receipt of magic packet, unicast physical address match on incoming packets, and predefined pattern

match in the incoming data.

c) LPC (Low Pin Count) interface for BIOS ROM plus optional conventional BIOS ROM support

d) Universal Serial Bus controller that is USB v1.1 and Universal HCI v1.1 compliant. The VT8231 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.

e) Keyboard controller with PS2 mouse support

f) Real Time Clock with 256 byte extended CMOS. In addition to standard RTC functionality, the integrated RTC also includes

the date alarm, century field, and other enhancements for compatibility with the ACPI standard.

g) 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.

h) Hardware monitoring subsystem for managing system / motherboard voltage levels, temperatures, and fan speeds

i) Full System Management Bus (SMBus) interface with one master / slave port and one slave-only port

j) 16550-compatible serial I/O port with “Fast-IR” infrared communications port option.

k) 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.

l) Game port and MIDI port

m) Standard floppy disk drive interface

n) ECP/EPP-capable parallel port with floppy disk controller pinout option

o) Serial IRQ for docking and non-docking applications

p) Plug and Play controller that allows complete steerability of all PCI interrupts and internal interrupts 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.

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