Seagate ST400FX0002 Signal characteristics, SAS transmitters and receivers, Power, Ready LED Out

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11.4.6SAS 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
	Transmitter	Transfer Medium
	100	Transfer Medium
	100
		TY

Figure 17. SAS transmitters and receivers

.01

.01

RX

Receiver 100

RY

11.4.7Power

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.

11.5Signal characteristics

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 21 for signal type and signal name information.

11.5.1Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 22.

Table 22: Ready LED Out conditions

Normal command activity		LED status

Ready LED Meaning bit mode page 19h	0		1

Drive stopped, not ready, and no activity	Off		Off

Drive stopped, not ready, and activity	On		On
(command executing)
Drive started, ready, and no activity	On		Off

Drive started, ready, and activity	Off		On
(command executing)
Drive transitioning from not-ready state to		Blinks steadily
ready state or the reverse.	(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)

FORMAT UNIT in progress,		Toggles on/off

Pulsar XT.2 SAS Product Manual, Rev. B

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Contents Standard Models Self-Encrypting Drive Models ST400FX0002ST400FX0012 ST200FX0002 ST100FX0002Revision history Contents About self-encrypting drives Physical/electrical specificationsDefect and error management InstallationPage Pulsar XT.2 SAS Product Manual, Rev. B List of Figures Page Seagate Online Support and Services Seagate Technology support servicesScope Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean KCC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickChina Restriction of Hazardous Substances RoHS Directive Reference documentsGeneral description Standard featuresPerformance Media descriptionReliability Formatted capacities Factory-installed optionsProgrammable drive capacity Thin Provisioning Drive Configuration Access time Performance characteristicsInternal drive characteristics Performance characteristicsPerformance Format Mode Dcrt Bit IP Bit 400GB 200GB 100GBCache control Start/stop timeCaching write data Error rates Reliability specificationsEndurance Management Lifetime Endurance Management Reliability and servicePreventive maintenance Data RetentionPerformance impact Maximum processing delay Fully-enabled delay4 S.M.A.R.T Controlling S.M.A.R.TThermal monitor Predictive failuresImplementation State of the drive prior to testingDrive Self Test DST DST failure definitionLog page entries Short and extended testsShort test Function Code 001b Extended test Function Code 010bStorage Product warrantyShipping Product repair and return informationPower specifications Physical/electrical specificationsAC power requirements 400GB standard model DC power requirements DC power requirements200GB standard model DC power requirements 100GB standard model DC power requirements Current profiles General DC power requirement notesPower sequencing Conducted noise immunityCurrent profiles for 200GB models 400GB models in 6Gb operation Power dissipation200GB models in 6Gb operation Environmental limits Temperature a. Operating100GB models in 6Gb operation Effective altitude sea level a. Operating Relative humidityShock and vibration Recommended mounting ShockVibration a. Operating-normal Air cleanlinessCorrosive environment Mounting configuration dimensions 400GB models Mechanical specificationsWeight Pounds 100 grams Data encryption Controlled accessAdmin SP About self-encrypting drivesData bands Default passwordRandom number generator RNG Drive lockingCryptographic erase Authenticated firmware downloadPower requirements Supported commandsDrive internal defects/errors Defect and error managementSSD Physical format address descriptor Bit Byte Auto-Reallocation Drive error recovery proceduresSAS system errors Background Media ScanIdentifying a Protection Information drive Setting and determining the current Type LevelProtection Information PI Levels of PIDrive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresDual port support Supported commands Scsi commands supportedPersistent Reserve Read Capacity Write Inquiry data Mode Sense dataPage 14 1a 00 1a Mode Sense data for 400GB drivesMode Pages Mode Sense data for 200GB drivesMode Sense values for 100GB drives SAS physical interface Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusDatum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical descriptionReady LED Out Signal characteristicsPower SAS transmitters and receiversGeneral interface characteristics SAS-2 Specification complianceLED drive signal Differential signalsNumerics IndexPage RNG See also cooling Page Americas Seagate Technology LLC