Seagate ST9146753SS Signal characteristics, SAS transmitters and receivers, Power, Ready LED Out

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12.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 16. The receiver is AC cou- pling to eliminate ground shift noise.

		TX
	Transmitter	Differential
	Transmitter	Transfer Medium
	100	Transfer Medium
	100
		TY

Figure 16. SAS transmitters and receivers

.01

.01

RX

Receiver 100

RY

12.4.7Power

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.

12.5Signal 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.

12.5.1Ready 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, each cylinder change		Toggles on/off

Savvio 15K.3 SAS Product Manual, Rev. A

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Contents ST9300453SS ST9146653SS ST9300653SSST9300553SS ST9146853SSST9146753SSStandard Models Self-Encrypting Drive Models SED FIPS140-2 ModelsPage Contents Installation Defect and error managementAbout Fips About self-encrypting drives Interface requirementsPage Savvio 15K.3 SAS Product Manual, Rev. a List of Figures Page Seagate Online Support and Services Seagate Technology support servicesScope Standards Applicable standards and reference documentationElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance for the European Union Electromagnetic complianceAustralian C-Tick Korean KCCEuropean Union Restriction of Hazardous Substances RoHS Reference documents Scsi Commands Reference Manual SAS Interface ManualGeneral description Media description Standard featuresPerformance ReliabilityFormatted capacities Programmable drive capacity Factory installed optionsInternal drive characteristics Performance characteristicsSeek performance characteristics Access timeFormat command execution time General performance characteristicsStart/stop time Cache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataError rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsSeek errors Reliability and serviceInterface errors Preventive maintenance4 S.M.A.R.T Maximum processing delayControlling S.M.A.R.T Performance impactTemperature Log Page 0Dh Parameter Code Description Predictive failuresThermal monitor Drive Self Test DST State of the drive prior to testingDST failure definition ImplementationShort test Function Code 001b Short and extended testsExtended test Function Code 010b Log page entriesShipping Product warrantyProduct repair and return information StoragePhysical/electrical specifications PowerChoiceTM power managementPowerChoice modes DC power requirements AC power requirementsRegulation 300GB models DC power requirements146GB models DC power requirements General DC power requirement notes Power sequencingConducted noise immunity Current profile for 300GB models Current profilesCurrent profile for 146GB models Power dissipation 300GB models in 6Gb operation300GB models in 3Gb operation 146GB models in 3Gb operation 146GB models in 6Gb operationTemperature a. Operating Environmental limitsRelative humidity Effective altitude sea level a. Operating Shock and vibrationShock Recommended mounting Vibration a. Operating-normalAir cleanliness Corrosive environmentAcoustics Dimensions Mechanical specificationsAbout Fips PurposeLevel 2 security Admin SP Controlled accessAbout self-encrypting drives Data encryptionRandom number generator RNG Default passwordDrive locking Data bandsPower requirements Authenticated firmware downloadSupported commands Cryptographic eraseDefect and error management Drive internal defects/errorsDrive error recovery procedures Background Media Scan SAS system errorsMedia Pre-Scan Deferred Auto-ReallocationIdle Read After Write Protection Information PI Setting and determining the current Type LevelLevels of PI Identifying a Protection Information driveDrive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresScsi commands supported Supported commandsDual port support Supported commands Supported commands Supported commands Mode Sense data Inquiry dataSavvio inquiry data Page Mode Data Header Mode Data Header Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interface Datum B Section C C Section a a Connector requirements Physical characteristicsElectrical description Pin descriptionsPower Signal characteristicsSAS transmitters and receivers Ready LED OutLED drive signal SAS-2 Specification complianceDifferential signals General interface characteristicsNumerics IndexPage Msid Mtbf See also cooling Page Savvio 15K.3 SAS Product Manual, Rev. a