Seagate ST3146756SS (FDE) manual Signal characteristics, SAS transmitters and receivers, Power

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9.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 17. The receiver is AC cou- pling to eliminate ground shift noise.

 

TX

Transmitter

Differential

Transfer Medium

100

 

 

TY

Figure 17. 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 25 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 26.

Table 26: 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

 

Toggles on/off

 

 

 

Write Same command in progress

 

Toggles on/off

 

 

 

 

Cheetah 15K.6 SAS Product Manual, Rev. B

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Contents ST3146356SS ST3450856SSST3300656SS Page Contents Interface requirements Defect and error managementInstallation Seagate Technology support servicesModel Number Full Disk Encryption FDE ScopeCheetah 15K.6 SAS Product Manual, Rev. B Electromagnetic susceptibility Standards, compliance and reference documentsStandards Electromagnetic compatibilityEuropean Union Restriction of Hazardous Substances RoHS ComplianceReference documents Cheetah 15K.6 SAS Product Manual, Rev. B General description Performance Standard featuresMedia description Programmable drive capacity Factory-installed optionsReliability Formatted capacitiesCheetah 15K.6 SAS Product Manual, Rev. B Seek time Performance characteristicsInternal drive characteristics Access time176 144 100 Format command execution time minutesGeneral performance characteristics Start/stop timeCache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataUnrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsMilliseconds 4 S.M.A.R.TControlling S.M.A.R.T Performance impactThermal monitor Reporting controlDetermining rate Predictive failuresDST failure definition Temperature Log Page 0Dh Parameter Code DescriptionState of the drive prior to testing Drive Self Test DSTExtended test Function Code 010b Invoking DSTShort and extended tests Short test Function Code 001bProduct repair and return information Product warrantyAbort ShippingCheetah 15K.6 SAS Product Manual, Rev. B ST3450856SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirementsST3300656SS Gbit mode Amps ST3450056SS FDE DC power requirementsST3300656SS DC power requirements ST3450056SS FDE Gbit mode AmpsST3146356SS Gbit mode Amps ST3300056SS FDE DC power requirementsST3146356SS DC power requirements ST3300056SS FDE Gbit mode AmpsST3146756SS FDE Gbit mode Amps ST3146756SS FDE DC power requirementsCurrent profiles Power sequencingConducted noise immunity Typical 450GB current profiles Typical 146GB current profiles ST3450856SS model Power dissipationST3450056SS FDE model ST3300656SS model ST3300056SS FDE model ST3146356SS model ST3146756SS FDE model in 3 Gbit operation Environmental limits TemperatureShock Relative humidityEffective altitude sea level Shock and vibrationRecommended mounting Package size Packaged/product weight Drop heightCorrosive environment Air cleanlinessVibration AcousticsMechanical specifications Physical dimensions Cheetah 15K.6 SAS Product Manual, Rev. B Drive error recovery procedures Defect and error managementDrive internal defects/errors 51.87 Media Pre-Scan SAS system errorsBackground Media Scan Idle Read After Write Deferred Auto-ReallocationCooling InstallationDrive orientation Air flow Grounding Drive mountingCheetah 15K.6 SAS Product Manual, Rev. B Interface requirements SAS featuresDual port support Command name Command code Supported Scsi commands supportedCommands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Bytes Data hex Inquiry dataMode Sense data Mode Pages 2.1 ST3450856SS/ST3450056SS Mode Sense data2.2 ST3300656SS/ST3300056SS Mode Sense data 2.3 ST3146356SS/ST3146756SS Mode Sense data SAS physical interface Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusPhysical interface Datum B Connector requirements Physical characteristicsSAS pin descriptions Pin Signal name Signal typeElectrical description Pin descriptionsReady LED Out Signal characteristicsPower SAS transmitters and receiversEye masks Eye masks overview LED drive signalDifferential signals General interface characteristicsNormalized time in UI Receive eye maskJitter tolerance masks Absolute amplitudeFrequency in kHz Peak-toSinusoidal JitterSignal characteristica Units Gbps Transmitter signal characteristicsMaximum allowable jitter Receiver signal characteristicsSignal characteristic Units Gbps Impedance requirements Sheet 1 Impedance specificationsReceiver jitter tolerance Compliant jitter test pattern CjtpatElectrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah 15K.6 SAS Product Manual, Rev. B Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Numerics IndexIraw SAS See also cooling
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