Seagate ST3450657SS SAS transmitters and receivers, Power, Signal Characteristics, Ready LED Out

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11.4.6 SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 15. The receiver is AC coupling to eliminate ground shift noise.

Figure 15. SAS transmitters and receivers

11.4.7 Power

The drive receives power (+5 volts and +12 volts) through the SAS device connector.

Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.

Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.

Current to the drive through the long power pins may be limited by the system to reduce inrush current to the drive during hot plugging.

11.5SIGNAL CHARACTERISTICS

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 13 for signal type and signal name information.

11.5.1 Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 14.

Table 14 Ready LED Out conditions

NORMAL COMMAND ACTIVITY

LED STATUS

 

 

 

 

 

Ready LED Meaning bit mode page 19h

0

 

1

 

 

 

 

Spun down and no activity

Off

 

Off

 

 

 

 

Spun down and activity (command executing)

On

 

On

 

 

 

 

Spun up and no activity

On

 

Off

 

 

 

 

Spun up and activity (command executing)

Off

 

On

 

 

 

 

Spinning up or down

 

Blinks steadily

 

(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)

 

 

 

Format in progress

 

Toggles on/off

 

 

 

Write Same command in progress

 

Toggles on/off

 

 

 

 

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 resistor are external to the drive. See Table 15 for the output characteristics of the LED drive signals.

CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F

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Contents Standard models Self-Encrypting Drive models SED Fips 140-2 modelsPage Contents Defect and Error Management InstallationAbout Fips About SELF-ENCRYPTING Drives Interface RequirementsCheetah 15K.7 SAS Product MANUAL, REV. F III Seagate Technology Support Services SED ScopeFips 140-2 L Evel Compliance STANDARDS, Compliance and Reference DocumentsStandards Australian C-Tick Korean KCCTaiwanese Bsmi European Union Restriction of Hazardous Substances RohsGeneral Description Performance Standard FeaturesMedia Description FACTORY-INSTALLED Options ReliabilityFormatted Capacities ST3600057SS ST3450857SS ST3300657FCPerformance Characteristics Internal Drive CharacteristicsAccess time Format command execution time minutesPREFETCH/MULTI-SEGMENTED Cache Control General performance characteristicsSTART/STOP Time Cache Operation Caching write data Prefetch operationReliability and Service Reliability SpecificationsError Rates Preventive maintenance Hot plugging the drive4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact MillisecondsReporting control Determining rateTemperature Log Page 0Dh Parameter Code DescriptionDrive Self Test DST DST failure definitionState of the drive prior to testing ImplementationInvoking DST Short and extended testsProduct warranty Log page entriesAbort ShippingPHYSICAL/ELECTRICAL Specifications AC Power RequirementsDC Power Requirements 600 GB DC power requirements450 GB DC power requirements 300 GB DC power requirements Current profiles Power sequencingConducted noise immunity Typical 450GB current profiles Power Dissipation Environmental Limits Temperature a. Operating300GB model Relative humidity Effective altitude sea level a. OperatingShock and vibration ShockVibration Recommended mountingAir cleanliness AcousticsCorrosive environment RoHS compliance statementMechanical Specifications Units of Measure mm inchesSeagate Enterprise SED PurposeValidation Program Controlled Access About SELF-ENCRYPTING DrivesData Encryption Random Number Generator RNGAuthenticated Firmware Download Power RequirementsSupported Commands Drive LockingDrive Error Recovery Procedures Defect and Error ManagementDrive Internal DEFECTS/ERRORS SAS System Errors Read and write retry count maximum recovery timesBackground Media Scan Media PRE-SCANDeferred AUTO-REALLOCATION Idle Read After WriteCooling InstallationDrive Orientation Drive Mounting GroundingSAS Features Interface RequirementsTask management functions Task management responsesScsi Commands Supported Commands supported by Cheetah 15K.7 SAS family drivesCommands supported by Cheetah 15K.7 SAS family drives Commands supported by Cheetah 15K.7 SAS family drives Cheetah 15K.7 inquiry data Mode Sense dataInquiry data Cheetah 15K.7 SAS Product MANUAL, REV. F 11.3.2.1 600GBmodel Mode Sense data 11.3.2.2 450GB model Mode Sense data 11.3.2.3 300GB model Mode Sense data Miscellaneous Operating Features and Conditions Supported Feature or conditionMiscellaneous features SAS physical interfaceDatum B This Area Physical characteristics Connector requirementsElectrical description Pin descriptionsPower Signal CharacteristicsSAS transmitters and receivers Ready LED OutDifferential signals SAS-2 Specification ComplianceBPS Additional InformationIndex Page SAS See also cooling Seagate Technology LLC Americas
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