Seagate ST31000640SSIM manual Receiver jitter tolerance, Compliant jitter test pattern Cjtpat

Page 71

9.5.2.3.2Receiver jitter tolerance

Table 19 defines the amount of jitter the receiver shall tolerate.

Table 19: Receiver jitter tolerance

 

1.5 Gbpsa

 

 

3.0 Gbpsa

 

Sinusoidal

Deterministic

Total

Sinusoidal

Deterministic

Total

jitterb,c

jittere,f,h

jitterh

jitterb,d

jittere,g,h

jitterh

0.10

0.35

0.65

0.10

0.35

0.65

 

 

 

 

 

 

aUnits are in UI.

bThe jitter values given are normative for a combination of deterministic jitter, random jitter, and sinusoidal jitter that receivers shall be able to tolerate without exceeding a BER of 10-12. Receivers shall tolerate sinusoidal jitter of progressively greater amplitude at lower frequencies, according to the mask in figure 18 with the same deterministic jitter and random jitter levels as were used in the high frequency sweep.

cSinusoidal swept frequency: 900 kHz to > 5 MHz.

dSinusoidal swept frequency: 1.800 kHz to > 5 MHz.

eNo value is given for random jitter. For compliance with this standard, the actual random jitter amplitude shall be the value that brings total jitter to the stated value at a probability of 10-12. The additional 0.1 UI of sinusoidal jitter is added to ensure the receiver has sufficient operating margin in the presence of external interference.

fDeterministic jitter: 900 kHz to 750 MHz.

gDeterministic jitter: 1.800 kHz to 1.500 MHz.

hThe 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).

9.5.2.3.3Compliant jitter test pattern (CJTPAT)

The CJTPAT within a compliant protocol frame is used for all jitter testing unless otherwise specified. See the SAS Interface Manual for definition of the required pattern on the physical link and information regarding spe- cial considerations for scrambling and running disparity.

9.5.2.3.4Impedance specifications

Table 20 defines impedance requirements.

Table 20: Impedance requirements (Sheet 1 of 2)

Requirement

Units

1.5 Gbps

3.0 Gbps

 

 

 

 

Time domain reflectometer rise time 20 % to 80 %a,b

ps

100

50

Media (PCB or cable)

 

 

 

 

 

 

 

Differential impedanceb,c,d

ohm

100 ± 10

100 ± 10

Differential impedance imbalanceb,c,d,g

ohm

5

5

Common mode impedanceb,c,d

ohm

32.5 ± 7.5

32.5 ± 7.5

Mated connectors

 

 

 

 

 

 

 

Differential impedanceb,c,d

ohm

100 ± 15

100 ± 15

Differential impedance imbalanceb,c,d,g

ohm

5

5

Common mode impedanceb,c,d

ohm

32.5 ± 7.5

32.5 ± 7.5

Receiver termination

 

 

 

 

 

 

 

Differential impedanceb,e,f

ohm

100 ± 15

100 ± 15

Differential impedance imbalanceb,e,f,g

ohm

5

5

Receiver termination time constantb,e,f

ps

150 max

100 max

Barracuda ES.2 SAS Product Manual, Rev. G

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Contents ST31000640SS ST3750630SS ST3500620SS Barracuda ES.2 SASPage General description Performance characteristicsReliability specifications Physical/electrical specificationsInterface requirements Defect and error managementInstallation Seagate Technology Support Services Barracuda ES.2 SAS Product Manual, Rev Scope Barracuda ES.2 SAS Product Manual, Rev. G Electromagnetic susceptibility Standards, compliance and reference documentsStandards Electromagnetic compatibilityCompliance Reference documents Barracuda ES.2 SAS Product Manual, Rev. G Barracuda ES.2 drive illustration General descriptionReliability Standard featuresMedia description PerformanceProgrammable drive capacity Factory-installed optionsFormatted capacities Barracuda ES.2 SAS Product Manual, Rev. G Seek performance Performance characteristicsInternal drive characteristics Access timeStart/stop time Format command execution time minutesGeneral performance characteristics Caching write data Prefetch/multi-segmented cache controlCache operation Prefetch operation Unrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsReporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impactThermal monitor Temperature Log Page 0DhPredictive failures Invoking DST State of the drive prior to testingDST failure definition ImplementationLog page entries Product warrantyShort test Function Code 001b Extended test Function Code 010bProduct repair and return information ShippingBarracuda ES.2 SAS Product Manual, Rev. G ST31000640SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirementsST3500620SS DC power requirements ST3750630SS DC power requirementsCurrent profiles General DC power requirement notesPower sequencing Conducted noise immunityTypical ST31000640SS drive +5V and +12V current profiles Typical ST3500620SS drive +5V and +12V current profiles Power dissipationBarracuda ES.2 SAS Product Manual, Rev. G Environmental limits Temperature a. OperatingShock Relative humidityEffective altitude sea level a. Operating Shock and vibrationPackage size Packaged/product weight Drop height Corrosive environment Air cleanlinessVibration a. Operating-normal AcousticsSee Section Barracuda ES.2 SAS Product Manual, Rev. G Physical dimensions Mechanical specificationsDrive error recovery procedures Defect and error managementDrive internal defects/errors 108.29 Media Pre-Scan SAS system errorsBackground Media Scan Idle Read After Write Deferred Auto-ReallocationDrive orientation InstallationAir flow CoolingGrounding Drive mountingBarracuda ES.2 SAS Product Manual, Rev. G Interface requirements SAS featuresDual port support Command name Command code Supported Scsi commands supportedCommands 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 Commands supported by Barracuda ES.2 SAS family drives Barracuda ES.2 SAS inquiry data Bytes Data hex Mode Sense dataInquiry data Page Mode Pages 2.1 ST31000640SS Mode Sense data2.2 ST3750630SS Mode Sense data 2.3 ST3500620SS Mode Sense data Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or conditionSAS physical 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 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 Shows the zero-length test load Receiver characteristics Barracuda ES.2 SAS Product Manual, Rev. G
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