Signal characteristics, Power, Ready LED Out | Seagate ST9500431SS

12.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 13. The receiver is AC cou- pling to eliminate ground shift noise.

		TX
	Transmitter	Differential
	Transmitter	Transfer Medium
	100	Transfer Medium
	100
		TY

Figure 13. 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 11 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 12.

Table 12: 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

60	Constellation SAS Product Manual, Rev. E

Image 68

Seagate ST9500431SS manual Signal characteristics, SAS transmitters and receivers, Power, Ready LED Out conditions

Contents

ST9500430SSST9500431SS ST9500432SSStandard Model Self-Encrypting Drive Model SED Fips 140-2 Model Revision history Contents Defect and error management InstallationAbout Fips About self-encrypting drives Interface requirements Power Constellation SAS Product Manual, Rev. E List of Figures GB model current profiles Constellation SAS Product Manual, Rev. E Seagate Technology support services Seagate Online Support and Services Scope Applicable standards and reference documentation StandardsElectromagnetic compatibility Electromagnetic susceptibility Electromagnetic compliance Electromagnetic compliance for the European UnionAustralian C-Tick Korean KCC Reference documents European Union Restriction of Hazardous Substances RoHS General description Standard features Media description Performance ReliabilityFormatted capacities Programmable drive capacity Factory-installed options Performance characteristics Internal drive characteristicsSeek performance characteristics Access time General performance characteristics Start/stop time Prefetch/multi-segmented cache control Cache operation Caching write data Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable Errors Reliability and service Seek errorsInterface errors Preventive maintenance 4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting control Thermal monitor Temperature Log Page 0Dh Parameter Code DescriptionPredictive failures State of the drive prior to testing Drive Self Test DSTDST failure definition Implementation Short and extended tests Short test Function Code 001bExtended test Function Code 010b Log page entries Product repair and return information Product warrantyShipping PowerChoice modes Physical/electrical specificationsPowerChoiceTM power management AC power requirements DC power requirementsPage Conducted noise immunity General DC power requirement notesPower sequencing Current profiles GB model current profiles Power dissipation ST9500430SS, ST9500431SS and ST9500432SS in 3 Gbit operation ST9500430SS, ST9500431SS and ST9500432SS in 6 Gbit operation Temperature a. Operating Environmental limits Relative humidity Effective altitude sea level a. OperatingShock and vibration ShockPage Recommended mounting Corrosive environment Air cleanlinessVibration a. Operating-normal Acoustics Mechanical specifications Mounting configuration dimensions Level 2 security About FipsPurpose Controlled access Admin SPAbout self-encrypting drives Data encryption Default password Random number generator RNGDrive locking Data bands Authenticated firmware download Power requirementsSupported commands Cryptographic erase Drive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Deferred Auto-Reallocation Background Media ScanMedia Pre-Scan Idle Read After Write Installation Drive orientation Cooling Air flow Drive mounting Grounding SAS features Interface requirements Dual port support Scsi commands supported Supported commands Supported commands Supported commands Supported commands Constellation inquiry data Mode Sense dataInquiry data Page Mode Data Header Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Datum B Section C C Section a a Physical characteristics Connector requirementsElectrical description Pin descriptions Signal characteristics PowerSAS transmitters and receivers Ready LED Out SAS-2 Specification Compliance LED drive signalDifferential signals General interface characteristics Constellation SAS Product Manual, Rev. E Index Numerics KCC Msid Mtbf See also cooling Page Constellation SAS Product Manual, Rev. E Page Seagate Technology LLC