About The Serial Ata Interface; Ioedc Overview - Seagate ST3750641NS Product Manual

Barracuda es+ serial ata
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1.1

About the Serial ATA interface

The Serial ATA interface provides several advantages over the traditional (parallel) ATA interface. The primary
advantages include:
• Easy installation and configuration with true plug-and-play connectivity. It is not necessary to set any jump-
ers or other configuration options.
• Thinner and more flexible cabling for improved enclosure airflow and ease of installation.
• Scalability to higher performance levels.
In addition, Serial ATA makes the transition from parallel ATA easy by providing legacy software support. Serial
ATA was designed to allow you to install a Serial ATA host adapter and Serial ATA disc drive in your current
system and expect all of your existing applications to work as normal.
The Serial ATA interface connects each disc drive in a point-to-point configuration with the Serial ATA host
adapter. There is no master/slave relationship with Serial ATA devices like there is with parallel ATA. If two
drives are attached on one Serial ATA host adapter, the host operating system views the two devices as if they
were both "masters" on two separate ports. This essentially means both drives behave as if they are Device 0
(master) devices.
Note.
The host adapter may, optionally, emulate a master/slave environment to host software where two
devices on separate Serial ATA ports are represented to host software as a Device 0 (master) and
Device 1 (slave) accessed at the same set of host bus addresses. A host adapter that emulates a
master/slave environment manages two sets of shadow registers. This is not a typical Serial ATA
environment.
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 regis-
ters, referred to as the Shadow Register Block. All Serial ATA devices behave like Device 0 devices. For addi-
tional information about how Serial ATA emulates parallel ATA, refer to the "Serial ATA: High Speed Serialized
AT Attachment" specification. The specification can be downloaded from www.serialata.org.
1.2

IOEDC overview

• This is a protection scheme designed to protect the integrity of the user data sent to/from the host computer.
It is a detection code, not a correction code.
• Detection code is utilized to report an error to a higher level system layer with the expectation that the sys-
tem layer will be able to either retry the transfer of the bad data or correct the bad data through some other
higher layer mechanism.
• For example, some RAID systems are capable of fixing bad data sent from a disc drive, providing the disc
drive correctly identifies the bad data. IOEDC, consists of appending a two byte detection code (parity) to
every 512 byte interface block (payload).
2
Barracuda ES+ Serial ATA Product Manual, Rev. B

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