Seagate ST93811AS, ST98823AS, ST96812AS, ST94813AS, ST9120821AS Deferred spinup, Additional details

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Figure 2. Typical +5V only startup and operation current profile

2.9.2Deferred spinup

Momentus 5400.2 SATA drives provide a deferred spinup feature which storage subsystem controllers can use to sequence disc drive initialization. This is beneficial to systems which include multiple Serial ATA hard disc drives because it allows subsystem controllers to stagger the spinup of each drive to accommodate available power supply current. This feature does not impact time-to-ready in typical desktop systems.

To accommodate the deferred spinup of multiple disc drives in an enclosure, Momentus 5400.2 SATA disc drives will spin up only after power is applied to the drive and after successful PHY (Physical layer) initializa- tion. PHY initialization occurs after the PHY enters the DP7:DR_Ready state. This state is reached after a suc- cessful exchange of Out-Of-Band (OOB) signals with a functional host-side Serial ATA port. In desktop systems, SATA transceivers should initialize OOB as soon as power comes ready to guarantee the drive spins up quickly. Seagate disc drives will not spin up without an operational host-side Serial ATA transceiver.

Additional details

Upon system power up, PHY communication is initiated with a COMRESET signal, which is generated by the host-side transceiver. COMRESET is followed by a COMINIT signal generated by the disc drive transceiver. COMRESET and COMINIT are followed by an exchange of COMWAKE signals and Align primitives. The disc drive will spin up after the successful exchange of Align primitives cause the PHY to come ready.

For more details, refer to:

•Section 6.8 of the Serial ATA 1.0 High-Speed Serialized AT Attachment specification

•Section 6.2 of the Serial ATA II: Extensions to Serial ATA 1.0 specification

•SATA 1.0 design guides

Note. These specifications and guides are available on the Serial ATA web site (www.serialata.org).

Momentus 5400.2 SATA Product Manual, Rev. C

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Contents Momentus 5400.2 Sata Page Contents Momentus 5400.2 Sata Product Manual, Rev. C List of Figures Page Momentus 5400.2 Sata disc drive IntroductionAbout the Serial ATA interface Specification summary table Drive specificationsWarranty information for your drive Cylinders Read/write heads Sectors per track 16,383 Default logical geometryLBA mode Formatted capacityRecording and interface technology Physical characteristicsDrive specification Physical organizationTypical seek times msec Read Write Seek timeStart/stop times Typical seek timesPower specifications Additional details Deferred spinupIdle mode Power-management modesPower management modes Active modeEnvironmental specifications Vibration ShockOperating shock Nonoperating shockRadio frequency environments AcousticsElectromagnetic immunity Drive level acousticsAgency certification Safety certificationMeasurement type Specification ReliabilityKorean RRL Australian C-Tick N176FCC verification Environmental protection Corrosive environmentEuropean Union Restriction of Hazardous Substances RoHS Handling and static-discharge precautions Configuring and mounting the driveSerial ATA cables and connectors Configuring the driveDrive mounting Mounting dimensions-top, side and end viewMomentus 5400.2 Sata Product Manual, Rev. C Segment Pin Function Definition Serial ATA connector pin definitionsSignal Serial ATA Sata interfaceP10 Ground 2nd mate P11 Reserved Pin Function DefinitionCommand name Command code in hex ATA-standard commands Supported ATA commandsATA-standard security commands Command name Command code in hexMomentus 5400.2 Sata Product Manual, Rev. C Word Description Value Identify Device commandXx07H Bit Word Description if bit is set to Bit WordSet Features command values Set Features command3 S.M.A.R.T. commands A.R.T. commandsCode in features register A.R.T. command Technical Support Seagate Technology support servicesInternet Presales SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index ITE Sata Momentus 5400.2 Sata Product Manual, Rev. C Page Seagate Technology LLC
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