Seagate ST3400755SS Signal characteristics, SAS transmitters and receivers, Power, Ready LED Out

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9.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 29. The receiver is AC cou- pling to eliminate ground shift noise.

		TX
	Transmitter	Differential
	Transmitter	Transfer Medium
	100	Transfer Medium
	100
		TY

Figure 29. SAS transmitters and receivers

.01

.01

RX

Receiver

100

RY

9.4.7Power

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 sup- ply 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.

9.5Signal characteristics

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 10 for signal type and signal name information.

9.5.1Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 11.

Table 11: 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, each cylinder change		Toggles on/off

Cheetah NS SAS Product Manual, Rev. B

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Contents ST3400755SS Cheetah NS SASPage Contents Installation Defect and error managementSeagate Technology support services Interface requirementsTypical ST3400755SS drive +5V and +12V current profiles List of FiguresCheetah NS SAS Product Manual, Rev. B Scope Cheetah NS SAS Product Manual, Rev. B Standards Standards, compliance and reference documentsElectromagnetic compatibility Electromagnetic susceptibilityCompliance Reference documents Cheetah NS SAS Product Manual, Rev. B General description Media description Standard featuresPerformance ReliabilityFormatted capacities Factory-installed optionsProgrammable drive capacity ST3400755SSCheetah NS SAS Product Manual, Rev. B Internal drive characteristics Performance characteristicsAccess time Seek performanceGeneral performance characteristics Format command execution time minutesStart/stop time Cache operation Prefetch/multi-segmented cache controlCaching write data Prefetch operation Error rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsSeek errors Reliability and serviceInterface errors Preventive maintenanceControlling S.M.A.R.T 4 S.M.A.R.TPerformance impact Reporting controlPredictive failures Temperature Log Page 0DhThermal monitor DST failure definition State of the drive prior to testingImplementation Invoking DSTShort test Function Code 001b Product warrantyExtended test Function Code 010b Log page entriesProduct repair and return information ShippingCheetah NS SAS Product Manual, Rev. B AC power requirements Physical/electrical specificationsDC power requirements ST3400755SS DC power requirementsPower sequencing General DC power requirement notesConducted noise immunity Current profilesTypical ST3400755SS drive +5V and +12V current profiles Power dissipationEnvironmental limits TemperatureEffective altitude sea level Relative humidityShock and vibration ShockRecommended mounting Package size Packaged/product weight Drop heightVibration Air cleanlinessAcoustics Corrosive environmentChina Restriction of Hazardous Substances RoHS Directive X表示该部件（于同类物品程度上）所含的危险和有毒物质中国RoHS MCV标准所定义的门槛值。Physical dimensions Mechanical specificationsCheetah NS SAS Product Manual, Rev. B Drive internal defects/errors Defect and error managementDrive error recovery procedures 77.87 Background Media Scan SAS system errorsMedia Pre-Scan Idle Read After Write Deferred Auto-ReallocationDrive orientation InstallationAir flow CoolingGrounding Drive mountingCheetah NS SAS Product Manual, Rev. B Interface requirements SAS featuresDual port support Commands supported by Cheetah NS SAS family drives Scsi commands supportedCommand name Command code Supported Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Inquiry data Mode Sense dataCheetah NS SAS inquiry data Bytes Data hex Page Mode Pages 2.1 ST3400755SS Mode Sense dataMiscellaneous features Miscellaneous operating features and conditionsSupported Feature or condition Miscellaneous statusSAS physical interface Datum B Connector requirements Physical characteristicsElectrical description Pin Signal name Signal typePin descriptions SAS pin descriptionsPower Signal characteristicsSAS transmitters and receivers Ready LED OutDifferential signals LED drive signalGeneral interface characteristics Eye masks Eye masks overviewJitter tolerance masks Receive eye maskAbsolute amplitude Normalized time in UISinusoidal Peak-toJitter Frequency in kHzSignal characteristica Units Gbps Transmitter signal characteristicsSignal characteristic Units Gbps Receiver signal characteristicsMaximum allowable jitter Gbps m, n Deterministic jitterqReceiver jitter tolerance Impedance specificationsCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1Impedance requirements Sheet 2 Transmitter characteristicsElectrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah NS SAS Product Manual, Rev. B Internet Seagate Technology support servicesPresales Support Technical SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics IndexPage SAS See also cooling