Seagate ST100FX0002 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 23 for the output characteristics of the LED drive signals.

Table 23:	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

11.5.2Differential signals

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

Table 24 defines the general interface characteristics

Table 24: General interface characteristics

Characteristic	Units	1.5Gb/s	3.0Gb/s	6.0Gb/s

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

11.6SAS-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.

11.7Additional 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.

60	Pulsar XT.2 SAS Product Manual, Rev. B

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Contents ST400FX0002ST400FX0012 ST200FX0002 ST100FX0002 Standard Models Self-Encrypting Drive ModelsRevision history Contents Physical/electrical specifications Defect and error managementInstallation About self-encrypting drivesPage Pulsar XT.2 SAS Product Manual, Rev. B List of Figures Page 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 KCCReference documents China Restriction of Hazardous Substances RoHS DirectiveStandard features General descriptionReliability Media descriptionPerformance Programmable drive capacity Factory-installed optionsFormatted capacities Thin Provisioning Drive Configuration Performance characteristics Internal drive characteristicsPerformance characteristics Access timeFormat Mode Dcrt Bit IP Bit 400GB 200GB 100GB PerformanceCaching write data Start/stop timeCache control Reliability specifications Error ratesEndurance Management Reliability and service Preventive maintenanceData Retention Lifetime Endurance ManagementMaximum processing delay Fully-enabled delay 4 S.M.A.R.TControlling S.M.A.R.T Performance impactPredictive failures Thermal monitorState 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 ShippingProduct repair and return information StorageAC power requirements Physical/electrical specificationsPower specifications DC power requirements 400GB standard model DC power requirements200GB standard model DC power requirements 100GB standard model DC power requirements General DC power requirement notes Power sequencingConducted noise immunity Current profilesCurrent profiles for 200GB models 200GB models in 6Gb operation Power dissipation400GB models in 6Gb operation 100GB models in 6Gb operation Temperature a. OperatingEnvironmental limits Shock and vibration Relative humidityEffective altitude sea level a. Operating Shock Recommended mountingCorrosive environment Air cleanlinessVibration a. Operating-normal Mechanical specifications Mounting configuration dimensions 400GB modelsWeight Pounds 100 grams Controlled access Admin SPAbout self-encrypting drives Data encryptionDefault password Random number generator RNGDrive locking Data bandsAuthenticated firmware download Power requirementsSupported commands Cryptographic eraseSSD Physical format address descriptor Bit Byte Defect and error managementDrive internal defects/errors Drive error recovery procedures SAS system errorsBackground Media Scan Auto-ReallocationSetting and determining the current Type Level Protection Information PILevels of PI Identifying a Protection Information driveInstallation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Supported commandsPersistent Reserve Read Capacity Write Mode Sense data Inquiry dataPage Mode Sense data for 400GB drives 14 1a 00 1aMode Sense data for 200GB drives Mode PagesMode Sense values for 100GB drives Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interfaceDatum 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 NumericsPage RNG See also cooling Page Seagate Technology LLC Americas