VT8235 datasheet(8/145 Pages) VIA

8 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-2-

Product Features

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Concurrent PCI Bus Controller

− 33 MHz operation

− Supports up to six PCI masters

− Peer concurrency

− Concurrent multiple PCI master transactions; i.e., allow PCI masters from both PCI buses active at the same time

− Zero wait state PCI master and slave burst transfer rate

− PCI to system memory data streaming up to 132Mbyte/sec (data sent to north bridge via high speed V-Link

Interface)

− PCI master snoop ahead and snoop filtering

− Eight DW of CPU to PCI posted write buffers

− Byte merging in the write buffers to reduce the number of PCI cycles and to create further PCI bursting possibilities

− Enhanced PCI command optimization (MRL, MRM, MWI, etc.)

− Four lines of post write buffers from PCI masters to DRAM

− Sixteen levels (double-words) of prefetch buffers from DRAM for access by PCI masters

− Delay transaction from PCI master accessing DRAM

− Transaction timer for fair arbitration between PCI masters (granularity of two PCI clocks)

− Symmetric arbitration between Host/PCI bus for optimized system performance

− Complete steerable PCI interrupts

− PCI-2.2 compliant, 32 bit 3.3V PCI interface with 5V tolerant inputs

Fast Ethernet Controller

− High performance PCI master interface with scatter / gather and bursting capability

− Standard MII interface to external PHYceiver

− 1 / 10 / 100 MHz full and half duplex operation

− Independent 2K byte FIFOs for receive and transmit

− Flexible dynamically loadable EEPROM algorithm

− Physical, Broadcast, and Multicast address filtering using hashing function

− Magic packet and wake-on-address filtering

− Software controllable power down

UltraDMA-133 / 100 / 66 / 33 Master Mode EIDE Controller

− Dual channel master mode hard disk controller supporting four Enhanced IDE devices

− Transfer rate up to 133MB/sec to cover PIO mode 4, multi-word DMA mode 2 drives, and UltraDMA-133 interface

− Increased reliability using UltraDMA-133/100/66 transfer protocols

− Thirty-two levels (doublewords) of prefetch and write buffers

− Dual DMA engine for concurrent dual channel operation

− Bus master programming interface for SFF-8038i rev.1.0 and Windows-95 compliant

− Full scatter gather capability

− Support ATAPI compliant devices including DVD devices

− Support PCI native and ATA compatibility modes

− Complete software driver support

Direct Sound Ready AC97 Digital Audio Controller

− AC-Link access to 4 CODECs (AC97 + AMC97 + MC97)

− Multichannel Audio

− Bus Master Scatter / Gather DMA

− Dedicated read and write channels supporting simultaneous stereo playback and record

− Dedicated read and write channels supporting simultaneous modem receive and transmit

− 1 stereo DirectSound channel with source / volume control / mixer

− 1 shared FM / SPDIF PCM read channel

− 1 dedicated channel supporting multi-channel audio

− 32-byte line-bufers for each SGD channel

− Programmable 8bit / 16bit mono / stereo PCM data format support

− AC97 2.1 compliant

VT8235 Datasheet(PDF) 8 Page - VIA Technologies, Inc.

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