Seagate ST9146652SS, ST973452SS, ST973352SS SAS-2 Specification compliance, Additional information

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Table 16 defines the general interface characteristics.

Table 16: General interface characteristics

Characteristic	Units	1.5 Gbps	3.0 Gbps	6.0 Gbps

Bit rate (nominal)	Mbaud	1,500	3,000	6,000

Unit interval (UI)(nominal)	ps	666.6	333.3	166.6

Impedance (nominal, differential )	ohm	100	100	100

Transmitter transients, maximum	V	± 1.2	± 1.2	± 1.2

Receiver transients, maximum	V	± 1.2	± 1.2	± 1.2

12.6SAS-2 Specification compliance

Seagate SAS-2 drives are entirely compatible with the latest SAS-2 Specification (T10/1760-D) Revision 16.

The most important characteristic of the SAS-2 drive at 6 Gbps is that the receiver is capable of adapting the equalizer to optimize the receive margins. The SAS-2 drive has two types of equalizers:

1.A Decision Feedback Equalizer (DFE) which utilizes the standard SAS-2 training pattern transmitted dur- ing the SNW-3 training gap. The DFE circuit can derive an optimal equalization characteristic to compen- sate for many of the receive losses in the system.

2.A Feed Forward Equalizer (FFE) optimized to provide balanced receive margins over a range of channels bounded by the best and worst case channels as defined by the relevant ANSI standard.

12.7Additional information

Please contact your Seagate representative for SAS electrical details, if required.

For more information about the Phy, Link, Transport, and Applications layers of the SAS interface, refer to the Seagate SAS Interface Manual, part number 100293071.

For more information about the SCSI commands used by Seagate SAS drives, refer to the Seagate SCSI Commands Reference Manual, part number 100293068.

Savvio 15K.2 SAS Product Manual, Rev. E

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Contents SED Fips 140-2 Models ST9146852SSST9146752SS ST973452SSST973352SSST9146652SS ST973252SS Standard Models Self-Encrypting Drive ModelsPage Contents Interface requirements Defect and error managementInstallation About Fips About self-encrypting drivesPage Savvio 15K.2 SAS Product Manual, Rev. E List of Figures Page Seagate Online Support and Services Seagate Technology support servicesScope Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean MIC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickEuropean Union Restriction of Hazardous Substances RoHS Reference documentsGeneral description Media description Standard featuresFormatted capacities PerformanceReliability Options Programmable drive capacityAccess time Performance characteristicsInternal drive characteristics Seek performance characteristicsStart/stop time Format command execution timeGeneral performance characteristics Cache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataUnrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsReporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impactThermal monitor Temperature Log Page 0Dh Parameter Code DescriptionPredictive failures Implementation State of the drive prior to testingDrive Self Test DST DST failure definitionLog page entries Short and extended testsShort test Function Code 001b Extended test Function Code 010bProduct repair and return information Product warrantyShipping DC power requirements Physical/electrical specificationsAC power requirements Gbit mode Amps 146GB models DC power requirements73GB models DC power requirements Conducted noise immunity General DC power requirement notesPower sequencing Current profile for 146GB models Current profilesCurrent profile for 73GB models 146GB models in 3.0 Gbit operation Power dissipation146GB models in 6.0 Gbit operation 73GB models in 3.0 Gbit operation 73GB models in 6.0 Gbit operationRelative humidity Temperature a. OperatingEnvironmental limits Shock Effective altitude sea level a. OperatingShock and vibration Recommended mounting Corrosive environment Air cleanlinessVibration a. Operating-normal Acoustics Dimensions Mechanical specificationsLevel 2 security About FipsPurpose Data encryption Controlled accessAdmin SP About self-encrypting drivesData bands Default passwordRandom number generator RNG Drive lockingCryptographic erase Authenticated firmware downloadPower requirements Supported commandsDrive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Deferred Auto-Reallocation Background Media ScanMedia Pre-Scan Idle Read After Write Drive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresDual port support Supported commands Scsi commands supportedSupported commands Supported commands Supported commands Savvio inquiry data Mode Sense dataInquiry data Page Mode Data Header 00 00 05 12 8B 00 10 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Datum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical descriptionSAS transmitters and receivers SAS pin descriptionsSignal characteristics Additional information SAS-2 Specification complianceGeneral interface characteristics Savvio 15K.2 SAS Product Manual, Rev. E Numerics IndexIraw Msid Mtbf See also cooling