Seagate ST3300557SS SAS-2 Specification compliance, Additional information, LED drive signal

Page 67

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 25 for the output characteristics of the LED drive signals.

Table 25:

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

 

 

 

 

10.5.2Differential signals

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

Table 26 defines the general interface characteristics.

Table 26: 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

 

 

 

 

 

10.6SAS-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.

10.7Additional 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.

Cheetah 15K.7 SAS Product Manual, Rev. A

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Contents Standard models Self-Encrypting Drive models Cheetah 15K.7 SASPage Contents Interface requirements Defect and error managementInstallation About self-encrypting drivesSeagate Technology support services Cheetah 15K.7 SAS Product Manual, Rev. a Model Number Capacity Self-Encrypting Drive SED ScopeElectromagnetic susceptibility Standards, compliance and reference documentsStandards Electromagnetic compatibilityEuropean Union Restriction of Hazardous Substances RoHS ComplianceReference documents General description Media description Standard featuresPerformance Programmable drive capacity Factory-installed optionsReliability Formatted capacitiesSeek time Performance characteristicsInternal drive characteristics Access timeGeneral performance characteristics Format command execution time minutesStart/stop time Cache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataUnrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsMilliseconds 4 S.M.A.R.TControlling S.M.A.R.T Performance impactThermal monitor Reporting controlDetermining rate Predictive failuresDST failure definition Temperature Log Page 0Dh Parameter Code DescriptionState of the drive prior to testing Drive Self Test DSTExtended test Function Code 010b Invoking DSTShort and extended tests Short test Function Code 001bProduct repair and return information Product warrantyAbort ShippingAC power requirements Physical/electrical specificationsDC power requirements ST3600057SS ST3600957SS Gbit mode Amps 600 GB DC power requirementsST3450857SS ST3450757SS Gbit mode Amps 450 GB DC power requirementsST3300657SS ST3300557SS Gbit mode Amps 300 GB DC power requirementsConducted noise immunity Power sequencingCurrent profiles Typical 600GB current profiles Typical 300GB current profiles ST3600057SS model Power dissipationST3450857SS model Environmental limits TemperatureST3300657SS model Shock Relative humidityEffective altitude sea level Shock and vibrationPackage size Packaged/product weight Drop height Recommended mounting VibrationRoHS compliance statement Air cleanlinessAcoustics Corrosive environmentPhysical dimensions Mechanical specificationsData encryption Controlled accessAdmin SP About self-encrypting drivesData bands Authenticated firmware downloadRandom number generator RNG Drive lockingSupported commands Power requirementsDrive internal defects/errors Defect and error managementDrive error recovery procedures Page Background Media Scan SAS system errorsDeferred Auto-Reallocation Media Pre-ScanIdle Read After Write Drive orientation InstallationCooling Grounding Drive mountingInterface requirements SAS featuresDual port support Scsi commands supportedCommands supported by Cheetah 15K.6 SAS family drives Command name Command code SupportedCommands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Cheetah 15K.7 inquiry data Bytes Data hex Inquiry dataMode Sense data Mode Pages 10.3.2.1 ST3600057SS and ST3600957SS Mode Sense dataDEF CHG Mode Data Header Block Descriptor Mode Pages 10.3.2.2 ST3450857SS and ST3450757SS Mode Sense dataDEF CHG Read Capacity Data Buffer C D E F Mode Pages 10.3.2.3 ST3300657SS and ST3300557SS Mode Sense dataMiscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or conditionPhysical interface SAS physical interfaceDatum B Connector requirements Physical characteristicsSAS pin descriptions Pin Signal name Signal typeElectrical description Pin descriptionsReady LED Out Signal characteristicsPower SAS transmitters and receiversGeneral interface characteristics SAS-2 Specification complianceLED drive signal Differential signalsPresales Support Seagate Technology support servicesTechnical Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call CenterToll-freeDirect dialFAX Cheetah 15K.7 SAS Product Manual, Rev. a Numerics IndexPage SAS Smart
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