Seagate ST500NM0041 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 19. The receiver is AC cou- pling to eliminate ground shift noise.

		TX
	T	l
	T	T M
		T M
		100
		T

Figure 19. SAS transmitters and receivers

01

01

X

100

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 15 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 16.

Table 16: 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

70	Constellation ES.1 SAS Product Manual, Rev. E

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Contents ST1000NM0041 ST500NM0041 Standard Models Self-Encrypting Drive ModelsSED Fips 140-2 Models ST2000NM0041 Revision history Contents About Fips About self-encrypting drives Defect and error managementInstallation Interface requirementsPage Constellation ES.1 SAS Product Manual, Rev. E List of Figures Constellation ES.1 SAS Product Manual, Rev. E Seagate Technology support services Seagate Online Support and ServicesScope Model Number Self-Encrypting Drive SED Fips 140-2 LevelElectromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityAustralian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean KCCEuropean Union Restriction of Hazardous Substances RoHS China Restriction of Hazardous Substances RoHS DirectiveReference documents Self-Encrypting Drives Reference ManualGeneral description Standard features Media descriptionPerformance Formatted capacities Factory-installed optionsReliability Programmable drive capacitySeek performance characteristics Performance characteristicsInternal drive characteristics Access timeGeneral performance characteristics Start/stop timePrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationRecoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenancePerformance impact 4 S.M.A.R.TControlling S.M.A.R.T Reporting controlTemperature Log Page 0Dh Parameter Code Description Predictive failuresThermal monitor DST failure definition State of the drive prior to testingDrive Self Test DST ImplementationExtended test Function Code 010b Short and extended testsShort test Function Code 001b Log page entriesStorage Product warrantyShipping Product repair and return informationPhysical/electrical specifications PowerChoiceTM power managementPowerChoice modes AC power requirements DC power requirementsRegulation ±5% Constellation ES.1 SAS Product Manual, Rev. E Constellation ES.1 SAS Product Manual, Rev. E General DC power requirement notes Power sequencingConducted noise immunity Current profiles TB model current profilesConstellation ES.1 SAS Product Manual, Rev. E GB model current profiles Power dissipation 2TB models in 3Gb operation2TB models in 6Gb operation 1TB models in 3Gb operation 1TB models in 6Gb operation 500GB models in 3Gb operation 500GB models in 6Gb operation Temperature a. Operating Environmental limitsRelative humidity Effective altitude sea level a. Operating Shock and vibrationShock Vibration a. Operating-normal Recommended mountingAir cleanliness AcousticsCorrosive environment Mechanical specifications Mounting configuration dimensionsValidation Program About FipsPurpose Seagate Enterprise SEDExample of Fips tamper evidence labels About self-encrypting drives Controlled accessAdmin SP Data encryptionDrive locking Authenticated firmware downloadRandom number generator RNG Data bandsSanitize Cryptographic Erase Power requirementsSupported commands RevertSPDefect and error management Drive internal defects/errorsDrive error recovery procedures SAS system errors Background Media Scan Media Pre-ScanDeferred Auto-Reallocation Protection Information PI Setting and determining the current Type LevelIdle Read After Write Levels of PIIdentifying a Protection Information drive Installation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Supported commandsSupported commands Supported commands Supported commands Mode Sense data Inquiry dataConstellation ES.1 inquiry data Page Mode Sense data changeable and default values for 2TB drives Mode Sense data changeable and default values for 1TB drives 3a 38 60 30 00 00 02 Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interface Datum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers Signal characteristicsPower Ready LED OutDifferential signals SAS-2 Specification ComplianceLED drive signal General interface characteristicsConstellation ES.1 SAS Product Manual, Rev. E Index NumericsKCC Msid Mtbf See also cooling Page Constellation ES.1 SAS Product Manual, Rev. E Page Seagate Technology LLC Americas