Seagate ST91000640SS 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	1.5Gb/s	3.0Gb/s	6.0Gb/s

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.

68	Constellation.2 SAS Product Manual, Rev. H

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Contents ST91000640SSST91000641SS ST9500620SSST9500621SS ST91000642SS ST9500622SSStandard Models Self-Encrypting Drive Models SED Fips 140-2 ModelsRevision history Contents Defect and error management InstallationAbout Fips About self-encrypting drives Interface requirementsPage Constellation.2 SAS Product Manual, Rev. H List of Figures Constellation.2 SAS Product Manual, Rev. H Seagate Technology support services Seagate Online Support and ServicesScope Applicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance Electromagnetic compliance for the European UnionAustralian C-Tick Korean KCCEuropean Union Restriction of Hazardous Substances RoHS China Restriction of Hazardous Substances RoHS DirectiveReference documents Self-Encrypting Drives Reference ManualGeneral description Standard features Media descriptionPerformance ReliabilityFormatted capacities Programmable drive capacityFactory-installed options Performance characteristics Internal drive characteristicsSeek performance characteristics Access timeGeneral performance characteristics Start/stop timePrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationReliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenance4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlPredictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor State of the drive prior to testing Drive Self Test DSTDST failure definition ImplementationShort and extended tests Short test Function Code 001bExtended test Function Code 010b Log page entriesProduct warranty ShippingStorage Product repair and return informationPowerChoiceTM power management Physical/electrical specificationsPowerChoice modes AC power requirements DC power requirements1000GB drive Standard & SED model DC power requirements 500GB drive Standard & SED model DC power requirements Power sequencing General DC power requirement notesConducted noise immunity Current profiles TB model current profilesGB model current profiles Power dissipation 1TB model drive in 3Gb operation1TB model drive in 6Gb operation 500GB model drive in 3Gb operation 500GB model drive in 6Gb operation Environmental limits Temperature a. OperatingRelative humidity Shock and vibration Effective altitude sea level a. OperatingShock Recommended mounting Air cleanliness Vibration a. Operating-normalAcoustics Corrosive environmentSee Section Constellation.2 SAS Product Manual, Rev. H Mechanical specifications Mounting configuration dimensionsAbout Fips PurposeValidation Program Seagate Enterprise SEDExample of Fips tamper evidence labels Controlled access Admin SPAbout self-encrypting drives Data encryptionAuthenticated firmware download Random number generator RNGDrive locking Data bandsPower requirements Supported commandsDrive internal defects/errors Defect and error managementDrive error recovery procedures SAS system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Setting and determining the current Type Level Idle Read After WriteProtection Information PI Levels of PIIdentifying a Protection Information drive Installation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Supported commandsSupported commands Supported commands Supported commands Inquiry data Mode Sense dataConstellation.2 inquiry data Page Block Descriptor 00 00 00 00 3a 38 60 30 00 00 00 00 00 00 02 Miscellaneous features Miscellaneous operating features and conditionsMiscellaneous status SAS physical interface Datum B Section C C Section a a Physical characteristics Connector requirementsElectrical description Pin descriptionsSignal characteristics PowerSAS transmitters and receivers Ready LED OutSAS-2 Specification Compliance LED drive signalDifferential signals General interface characteristicsIndex NumericsKCC Msid Mtbf See also cooling Page Constellation.2 SAS Product Manual, Rev. H Page Seagate Technology LLC Americas