Seagate ST9146802SS, ST973402SS manual Receiver signal characteristics, Maximum allowable jitter

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9.5.2.3Receiver signal characteristics

Table 28 defines the compliance point requirements of the signal at the receiver end of a TxRx connection as measured into the test loads specified in figure 18 and figure 19.

Table 28: Receiver signal characteristics

Signal characteristic

Units

1.5 Gbps

3.0 Gbps

 

 

 

 

Jitter (see figure 15)b

N/A

See table 29

See table 29

2 x Z2

mV(P-P)

1,200

1,600

 

 

 

 

2 x Z1

mV(P-P)

325

275

 

 

 

 

X1a

UI

0.275

0.275

X2

UI

0.50

0.50

 

 

 

 

Skewd

ps

80

75

Max voltage (non-op)

mV(P-P)

2.000

2.000

 

 

 

 

Minimum OOB ALIGN burst amplitudec

mV(P-P)

240

240

Maximum noise during OOB idle timec

mV(P-P)

120

120

Max near-end crosstalke

mV(P-P)

100

100

 

 

 

 

aThe value for X1 shall be half the value given for total jitter in table 29. The test or analysis shall include the effects of a single pole high-pass frequency-weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1,667).

bThe value for X1 applies at a total jitter probability of 10-12. At this level of probability direct visual comparison between the mask and actual signals is not a valid method for determining compliance with the jitter output requirements.

cWith a measurement bandwidth of 1.5 times the baud rate (i.e. 4.5 GHz for 3.0 Gbps).

dThe skew measurement shall be made at the midpoint of the transition with a repeating 0101b pattern on the physical link. The same stable trigger, coherent to the data stream, shall be used for both the Rx+ and Rx- signals. Skew is defined as the time difference between the means of the midpoint crossing times of the Rx+ signal and the Rx- signal.

eNear-end crosstalk is the unwanted signal amplitude at receiver terminals DR, CR, and XR coupled from signals and noise sources other than the desired signal. Refer to SFF-8410.

9.5.2.3.1Jitter

Table 29 defines the maximum allowable jitter.

Table 29: Maximum allowable jitter

1.5 Gbps m, n

 

3.0 Gbps m, n

 

Deterministic jitterq

 

Total jitterc,d,e,f

Deterministic jittere

 

Total jitterc,d,e,f

0.35

 

0.55

0.35

 

0.55

 

 

 

 

 

 

aUnits are in UI.

bThe values for jitter in this section are measured at the average amplitude point.

cTotal jitter is the sum of deterministic jitter and random jitter. If the actual deterministic jitter is less than the maximum specified, then the random jitter may increase as long as the total jitter does not exceed the specified maximum total jitter.

dTotal jitter is specified at a probability of 10-12.

eThe deterministic and total values in this table apply to jitter after application of a single pole high-pass frequency- weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1 667).

fIf total jitter received at any point is less than the maximum allowed, then the jitter distribution of the signals is allowed

to be asymmetric. The total jitter plus the magnitude of the asymmetry shall not exceed the allowed maximum total jitter. The numerical difference between the average of the peaks with a BER < 10-12and the average of the individual events is the measure of the asymmetry. Jitter peak-to-peak measured < (maximum total jitter - Asymmetry).

Savvio 10K.2 SAS Product Manual, Rev. D

65

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Contents ST9146802SS ST973402SS Savvio 10K.2 SASPage Contents Interface requirements Defect and error managementInstallation Seagate Technology support servicesSavvio 10K.2 SAS disc drive List of FiguresPage Savvio 10K.2 SAS disc drive ScopeSavvio 10K.2 SAS Product Manual, Rev. D Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean MIC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickEuropean Union Restriction of Hazardous Substances RoHS Reference documentsSavvio 10K.2 SAS Product Manual, Rev. D General description Performance Standard featuresMedia description Programmable drive capacity Factory-installed accessoriesReliability Formatted capacitiesFactory-installed options Access time Performance characteristicsInternal drive characteristics Seek performance characteristicsGeneral performance characteristics Format command execution time for 512-byte sectors minutesCache operation Start/stop timePrefetch/multi-segmented cache control Prefetch operation Caching write dataPage Savvio 10K.2 SAS Product Manual, Rev. D Unrecoverable 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 failuresImplementation Temperature Log Page 0Dh Parameter Code DescriptionDrive Self Test DST DST failure definitionShort test Function Code 001b State of the drive prior to testingInvoking DST Short and extended testsShipping Product warrantyLog page entries AbortProduct repair and return information ST9146802SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirementsST973402SS Gbit mode Amps ST973402SS DC power requirementsGeneral DC power requirement notes Current profiles Power sequencingConducted noise immunity ST973402SS current profile ST973402SS in 3 Gbit operation Power dissipationST9146802SS 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 Acoustics Mounting configuration dimensions Mechanical specificationsSavvio 10K.2 SAS Product Manual, Rev. D Drive error recovery procedures Defect and error managementDrive internal defects/errors Page Background Media Scan SAS system errorsIdle Read After Write Media Pre-ScanDeferred Auto-Reallocation Drive orientation InstallationAir flow CoolingGrounding Drive mountingSavvio 10K.2 SAS Product Manual, Rev. D Interface requirements SAS featuresDual port support Command name Command code Supported Scsi commands supportedCommands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Bytes Data hex Mode Sense dataInquiry data Savvio inquiry dataPage Mode Data Header 08 8b b9 98 00 00 02 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or conditionSAS physical interface Datum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical descriptionReady LED Out Signal characteristicsPower SAS transmitters and receiversEye masks Eye masks overview LED drive signalDifferential signals General interface characteristicsJitter tolerance masks Receive eye maskFrequency in kHz Peak-toSinusoidal JitterSignal characteristica Units Gbps Transmitter signal characteristicsGbps m, n Deterministic jitterq Receiver signal characteristicsSignal characteristic Units Gbps Maximum allowable jitterImpedance requirements Sheet 1 Impedance specificationsReceiver jitter tolerance Compliant jitter test pattern CjtpatElectrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Tctf ISI loss example at 1.5 Gbps Receiver characteristicsTechnical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Numerics IndexPage SAS See also cooling Page Seagate Technology LLC
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ST973402SS, ST9146802SS specifications

The Seagate ST973402SS and ST9146802SS are high-performance, enterprise-grade hard drives designed to meet the demanding needs of data-intensive applications. These drives are part of Seagate's Savvio and Barracuda product lines, aimed specifically at businesses and institutions requiring reliability, speed, and efficiency in storage solutions.

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