Seagate ST3500620SS, ST31000640SS manual Receiver signal characteristics, Maximum allowable jitter

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9.5.2.3Receiver signal characteristics

Table 17 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 19 and figure 20.

Table 17: Receiver signal characteristics

Signal characteristic

Units

1.5 Gbps

3.0 Gbps

 

 

 

 

Jitter (see figure 16)b

N/A

See table 18

See table 18

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 18. 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 18 defines the maximum allowable jitter.

Table 18: Maximum allowable jitter

1.5 Gbps m, n

 

3.0 Gbps m, n

 

Deterministic jitterq

 

Total jitter c,d,e,f

Deterministic jitter e

 

Total jitter c,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).

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Barracuda ES.2 SAS Product Manual, Rev. E

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Contents Barracuda ES.2 SAS ST31000640SS ST3750630SS ST3500620SSPage Contents Defect and error management InstallationSeagate Technology support services Interface requirementsScope Barracuda ES.2 SAS Product Manual, Rev. E Standards, compliance and reference documents StandardsElectromagnetic compatibility Electromagnetic susceptibilityCompliance Reference documents Barracuda ES.2 SAS Product Manual, Rev. E General description Barracuda ES.2 drive illustrationStandard features Media descriptionPerformance ReliabilityProgrammable drive capacity Factory-installed optionsFormatted capacities Barracuda ES.2 SAS Product Manual, Rev. E Performance characteristics Internal drive characteristicsAccess time Seek performanceStart/stop time Format command execution time minutesGeneral performance characteristics Caching write data Prefetch/multi-segmented cache controlCache operation Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Seek errorsInterface errors Preventive maintenance4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlThermal monitor Temperature Log Page 0DhPredictive failures State of the drive prior to testing DST failure definitionImplementation Invoking DSTProduct warranty Short test Function Code 001bExtended test Function Code 010b Log page entriesShipping Product repair and return informationBarracuda ES.2 SAS Product Manual, Rev. E Physical/electrical specifications AC power requirementsDC power requirements ST31000640SS DC power requirementsST3750630SS DC power requirements ST3500620SS DC power requirementsGeneral DC power requirement notes Power sequencingConducted noise immunity Current profilesTypical ST31000640SS drive +5V and +12V current profiles Power dissipation Typical ST3500620SS drive +5V and +12V current profilesBarracuda ES.2 SAS Product Manual, Rev. E Temperature a. Operating Environmental limitsRelative humidity Effective altitude sea level a. OperatingShock and vibration ShockPackage size Packaged/product weight Drop height Air cleanliness Vibration a. Operating-normalAcoustics Corrosive environmentX表示该部件(于同类物品程度上)所含的危险和有毒物质超出中国RoHS MCV标准所定义的门槛值。 Mechanical specifications Physical dimensionsDrive error recovery procedures Defect and error managementDrive internal defects/errors 108.29 Media Pre-Scan SAS system errorsBackground Media Scan Deferred Auto-Reallocation Idle Read After WriteInstallation Drive orientationCooling Air flowDrive mounting GroundingBarracuda ES.2 SAS Product Manual, Rev. E SAS features Interface requirementsDual port support Scsi commands supported Commands supported by Barracuda ES.2 SAS family drivesCommands supported by Barracuda ES.2 SAS family drives Commands supported by Barracuda ES.2 SAS family drives Commands supported by Barracuda ES.2 SAS family drives Mode Sense data Inquiry dataPage 2.1 ST31000640SS Mode Sense data Mode Pages2.2 ST3750630SS Mode Sense data 2.3 ST3500620SS Mode Sense data Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Datum B Physical characteristics Connector requirementsSAS pin descriptions Electrical descriptionPin descriptions Signal characteristics PowerSAS transmitters and receivers Ready LED OutLED drive signal Differential signalsGeneral interface characteristics Eye masks Eye masks overviewReceive eye mask Jitter tolerance masksPeak-to SinusoidalJitter Frequency in kHzTransmitter signal characteristics Receiver signal characteristics Maximum allowable jitterImpedance specifications Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5, 437dB Shows the zero-length test load Receiver characteristics Barracuda ES.2 SAS Product Manual, Rev. E Seagate Technology support services InternetPresales Support Technical SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index Page SAS See also cooling Page Seagate Technology LLC

ST31000640SS, ST3500620SS, ST3750630SS specifications

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