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™ Serial ATA Controller Performance

By integrating the Serial ATA controller in the South Bridge, the VT8237 not only

delivers superior data transfer rates of up to 150 MB/s per SATA device compared to

a maximum of 133MB/s for Parallel ATA devices, but also eliminates the 132MB/s

bottleneck on the PCI bus that has significantly inhibited the performance of discrete

Serial ATA controllers.

As shown in Figure 3, the integrated VIA DriveStation™ Serial ATA Controller delivers

an increase of over 25% in data transfer speeds compared to a discrete Promise

PDC20376 Serial ATA controller using the popular HD Tach Burst Speed benchmark

over a single Serial ATA drive. HD Tach Burst Speed measures the speed in which

data from the HDD’s cache is transferred to the system, and represents the

theoretical peak of the system’s data transfer.

Figure 3: Serial ATA Performance: HD Tach Burst Speed Benchmark

Quick and Easy Set Up, & Hot Plug Capabilities

Setting up a Serial ATA Drive using the VIA DriveStation™ Serial ATA Controller is

intuitive and straightforward. In addition, no configuration at all is necessary when

installing an additional Serial ATA drive because there is no need for jumpers to

determine master/slave settings. The VIA DriveStation™ Serial ATA Controller also

supports hot-plug capabilities when the appropriate BIOS and OS support is enabled.

VIA DriveStation™ SATALite Interface

In its default configuration, the VIA DriveStation™ Serial ATA Controller supports up

to two Serial ATA devices and four Parallel ATA 133 devices directly. Two extra Serial

ATA ports can be supported through the implementation of the SATALite interface

with a single external PHY on the secondary Parallel-ATA interface, replacing one

Parallel ATA channel, as shown in Figure 4. Unlike IDE-to-SATA bridge solutions, that

are limited by the 133MB/s and half-duplex speed of the IDE bus, the SATALite

interface enables the two additional Serial ATA ports to be operated simultaneously

at full-duplex at up to 150MB/s speed.

Copyright © VIA Technologies, Inc, 2003.

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