Signal characteristics | Seagate ST936751SS, ST973451SS specification

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 13 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 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

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 15 for the output characteristics of the LED drive signals.

Table 15:	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

9.5.2Differential signals

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

Savvio 15K SAS Product Manual, Rev. B

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Seagate ST936751SS, ST973451SS manual Signal characteristics

Contents

100407739 Rev. B Savvio 15K SASPage Revision status summary sheet Savvio 15K SAS Product Manual, Rev. B Contents Interface requirements Defect and error managementInstallation Seagate Technology support services List of Figures Page Scope Savvio 15K SAS Product Manual, Rev. B Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibility Korean MIC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-Tick European Union Restriction of Hazardous Substances RoHS Reference documents Savvio 15K SAS Product Manual, Rev. B General description Media description Standard featuresPerformance Programmable drive capacity Factory-installed accessoriesReliability Formatted capacities Options Access time Gen 2.0 LP data Performance characteristicsInternal drive characteristics Seek performance characteristics General performance characteristics Format command execution time Prefetch/multi-segmented cache control Start/stop timeCache operation Prefetch operation Caching write data Unrecoverable Errors Reliability specificationsError rates Recoverable Errors Preventive maintenance Reliability and serviceSeek errors Interface errors Reporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impact Parameter Code Description Temperature Log Page 0DhPredictive failures Thermal monitor Invoking DST State of the drive prior to testingDST failure definition Implementation Log page entries Product warrantyShort test Function Code 001b Extended test Function Code 010b Product repair and return information Shipping Savvio 15K SAS Product Manual, Rev. B ST973451SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirements General DC power requirement notes ST936751SS DC power requirements Conducted noise immunity Power sequencingCurrent profiles Typical ST936751SS current profile ST973451SS in 3 Gbit operation Power dissipationST973451SS in 1.5 Gbit operation ST936751SS in 1.5 Gbit operation ST936751SS in 3 Gbit operation Environmental limits TemperatureRelative humidity Shock and vibration Effective altitude sea levelShock Recommended mounting Vibration Air cleanlinessCorrosive environment Acoustics Mounting configuration dimensions Mechanical specifications Drive internal defects/errors Defect and error managementDrive error recovery procedures SAS system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Idle Read After Write Drive orientation Installation Air flow Cooling Grounding Drive mounting Savvio 15K SAS Product Manual, Rev. B Interface requirements SAS features Dual port support Commands supported by Savvio SAS family drive Scsi commands supported Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Inquiry data Mode Sense dataSavvio inquiry data Page Mode Data Header 04 45 dc cc 00 00 02 Miscellaneous features Miscellaneous operating features and conditionsMiscellaneous status SAS physical interface Datum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical description SAS transmitters and receivers SAS pin descriptions Signal characteristics Eye masks Eye masks overview General interface characteristicsReceive eye mask Z1 OP Jitter tolerance masks Jitter Transmitter signal characteristicsPeak-to Sinusoidal Receiver signal characteristics Receiver jitter tolerance Maximum allowable jitterCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1 Impedance specifications Impedance requirements Sheet 2 Transmitter characteristicsElectrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Savvio 15K SAS Product Manual, Rev. B Technical Support Seagate Technology support servicesInternet Presales Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics IndexPage SAS See also cooling