Seagate BARRACUDA ST31000524AS User Manual download pdf (Page 10)

10 Barracuda SATA Product Manual, Rev. A

Introduction www.seagate.com

The Serial ATA host adapter and drive share the function of emulating parallel ATA device behavior to provide

backward compatibility with existing host systems and software. The Command and Control Block registers, PIO

and DMA data transfers, resets, and interrupts are all emulated.

The Serial ATA host adapter contains a set of registers that shadow the contents of the traditional device

registers, referred to as the Shadow Register Block. All Serial ATA devices behave like Device 0 devices. For

additional information about how Serial ATA emulates parallel ATA, refer to the “Serial ATA International

Organization: Serial ATA Revision 3.0”. The specification can be downloaded from www.sata-io.org.

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Seagate BARRACUDA ST31000524AS User Manual Page 10