VT8235 datasheet(10/145 Pages) VIA

10 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

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Overview

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OVERVIEW

The VT8235 South Bridge is a high integration, high performance, power-efficient, and high compatibility device that supports

Intel and non-Intel based processor to V-Link bus bridge functionality to make a complete Microsoft PC2001-compliant PCI/LPC

system. The VT8235 includes standard intelligent peripheral controllers:

a) IEEE 802.3 compliant 10 / 100 Mbps PCI bus master Ethernet MAC with standard MII interface to external PHYceiver.

b) 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 VT8235 also supports the UltraDMA-133, 100, 66, and

33 standards to allow reliable data transfer at rates up to 133 MB/sec. The IDE controller is SFF-8038i v1.0 and Microsoft

Windows-family compliant.

c) Universal Serial Bus controller that is USB v2.0 / 1.1 and Universal HCI v2.0 / 1.1 compliant. The VT8235 includes three

root hubs with six 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.

d) Keyboard controller with PS2 mouse support.

e) 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.

f) 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.

g) Full System Management Bus (SMBus) interface.

h) Integrated bus-mastering dual full-duplex direct-sound AC97-link-compatible sound system.

i) 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.

The VT8235 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 VT8235 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.

VT8235 датащи(PDF) 10 Page - VIA Technologies, Inc.