VT8237 データシートの表示（PDF） - Unspecified

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VT8237

Bringing Serial ATA and RAID to the Mainstream

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VIA VT8237 South Bridge

VIA DriveStation™ Controller Suite

The VIA DriveStation™ Controller Suite in the VIA VT8237

provides the most comprehensive set of high-performance

integrated storage interface technologies available on the

market today. It not only enables high-speed 150MB/s dual

channel connections to new generation Serial ATA Hard Drives

while retaining support for today’s Parallel ATA-133 devices, but also combines

exceptionally fast disk data transfer rates and optimal data integrity with easy

installation and manageability through V-RAID, the first native RAID controller

integrated into a South Bridge supporting multiple RAID configurations.

Serial ATA Explained

Serial ATA is in the process of succeeding Parallel ATA to become the

standard drive interface for all desktop and notebook PCs, and is

projected to represent over 90 percent of total desktop and mobile PC

hard disk drive shipments by 2005. Serial ATA will also enable high-

performance desktop-class drives to displace SCSI drives in entry-level

server environments. Parallel ATA has been the storage interface in

PCs for over 10 years, debuting at 3.3 MB/s and, culminating in

133MB/s with the ATA-133 standard, it has reached its performance limit. The key

advantages of Serial ATA can be summarized as follows:

• Higher Performance: With transfer speeds debuting at 150MB/s full-

duplex, compared with a maximum of 133MB/s half-duplex for Parallel

ATA, Serial ATA delivers all the bandwidth necessary to deal with the

increasingly demanding requirements of today’s and tomorrow’s digital

media applications, as well as offering improved data integrity.

• Easier Configuration: Using the appropriate controller driver, Serial

ATA devices can be instantly recognized by the operating system, and

can even be plugged in ‘on the fly’ while the system is running. Any

Serial ATA device will be detected as a ‘Master’ only, meaning that no

fiddling about with Master/Slave configurations is required. To enable

a smooth migration path from Parallel to Serial ATA, Serial ATA is

backward compatible with software that was originally designed to

work with Parallel ATA.

• System Design Innovation: As the industry moves towards smaller

form factor designs, Serial ATA brings a number of benefits to system

designers. The significantly reduced size of Serial ATA cable (see

Figure 2) allows for easier installation and improved airflow within the

system case, which is particularly important in a more compact

chassis. Serial ATA also enables a reduced connector pin count, with

only seven pins versus the forty pins required for an IDE interface.

This smaller connector size means less consumption of valuable board

layout space, which will be a welcome benefit to motherboard

designers. Serial ATA also brings a reduction in controller chip power

consumption compared to Parallel ATA, thus lowering the voltage

interface-signaling requirement and enabling reduced die size.

Furthermore, Serial ATA cables can be up to one meter in length, more

Copyright © VIA Technologies, Inc, 2003.

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