Seagate ST9146853SS SAS-2 Specification compliance, Additional information, LED drive signal

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The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper +3.3 volt supply through an appropriate current limiting resistor. The LED and the current limiting resis- tor are external to the drive. See Table 15 for the output characteristics of the LED drive signals.

Table 15:	LED drive signal

State		Test condition	Output voltage

LED off, high		0 V ≤VOH ≤3.6 V	-100 µA < IOH < 100 µA
LED on, low		IOL = 15 mA	0 ≤VOL ≤0.225 V

12.5.2Differential signals

The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard.

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	1500	3000	6000

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 6Gb/s 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.

62	Savvio 15K.3 SAS Product Manual, Rev. A

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Contents Standard Models Self-Encrypting Drive Models ST9300653SSST9300553SS ST9146853SSST9146753SSST9300453SS ST9146653SS SED FIPS140-2 ModelsPage Contents About Fips About self-encrypting drives Defect and error managementInstallation Interface requirementsPage Savvio 15K.3 SAS Product Manual, Rev. a List of Figures Page Seagate Technology support services Seagate Online Support and ServicesScope Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityAustralian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean KCCEuropean Union Restriction of Hazardous Substances RoHS Scsi Commands Reference Manual SAS Interface Manual Reference documentsGeneral description Standard features Media descriptionReliability PerformanceFormatted capacities Factory installed options Programmable drive capacitySeek performance characteristics Performance characteristicsInternal drive characteristics Access timeGeneral performance characteristics Format command execution timeStart/stop time Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationRecoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenanceControlling S.M.A.R.T Maximum processing delay4 S.M.A.R.T Performance impactPredictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor DST failure definition State of the drive prior to testingDrive Self Test DST ImplementationExtended test Function Code 010b Short and extended testsShort test Function Code 001b Log page entriesProduct repair and return information Product warrantyShipping StoragePowerChoiceTM power management Physical/electrical specificationsPowerChoice modes AC power requirements DC power requirements300GB models DC power requirements Regulation146GB models DC power requirements Power sequencing General DC power requirement notesConducted noise immunity Current profiles Current profile for 300GB modelsCurrent profile for 146GB models 300GB models in 6Gb operation Power dissipation300GB models in 3Gb operation 146GB models in 6Gb operation 146GB models in 3Gb operationEnvironmental limits Temperature a. OperatingRelative humidity Shock and vibration Effective altitude sea level a. OperatingShock Vibration a. Operating-normal Recommended mountingCorrosive environment Air cleanlinessAcoustics Mechanical specifications DimensionsPurpose About FipsLevel 2 security About self-encrypting drives Controlled accessAdmin SP Data encryptionDrive locking Default passwordRandom number generator RNG Data bandsSupported commands Authenticated firmware downloadPower requirements Cryptographic eraseDrive internal defects/errors Defect and error managementDrive error recovery procedures SAS system errors Background Media ScanDeferred Auto-Reallocation Media Pre-ScanIdle Read After Write Levels of PI Setting and determining the current Type LevelProtection Information PI Identifying a Protection Information driveInstallation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsSupported commands Scsi commands supportedDual port support Supported commands Supported commands Supported commands Inquiry data Mode Sense dataSavvio inquiry data Page Mode Data Header Mode Data Header Miscellaneous features Miscellaneous operating features and conditionsMiscellaneous status SAS physical interface Datum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers Signal characteristicsPower Ready LED OutDifferential signals SAS-2 Specification complianceLED drive signal General interface characteristicsIndex NumericsPage Msid Mtbf See also cooling Page Savvio 15K.3 SAS Product Manual, Rev. a