Seagate ST336938LW, ST318418N manual Terminator requirements, Terminator power Drives, LW drives

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Barracuda 36ES2 Product Manual, Rev. B

9.8Terminator requirements

N models have active, permanently mounted LSI terminator circuits on board the PCB.

All single initiator/single target (non-daisy-chain) applications require that the Initiator and disc drive be termi- nated. Daisy-chain applications require that only the units at each end of the daisy-chain be terminated. All other peripherals on the chain must not be terminated (see Figure 21).

Note. Remove drive terminator enabling jumper TE where terminators are not required. Removal of termina- tor power source selection jumper TP (see Figure 14) does not disconnect the terminator resistors from the circuit.

It is required that ANSI SCSI-2 Standard’s Alternative 2 termination (active termination) be used for applica- tions with single-ended mode, especially if the bus will be operated at transfer rates above 5 Mbytes/sec.

Note. Active terminators are required for use in the daisy chain as described above. Do not use passive ter- minators at any transfer speed. Do not mix active and passive terminators on the same SCSI bus.

Caution: LW models do not have onboard internal terminators. The user, systems integrator or host equip- ment manufacturer must provide a terminator arrangement external to the drive when termination is required. For LW drives, terminator modules can be purchased that plug between the SCSI I/O cable and the drive I/O connector or on the end of a short I/O cable stub extending past the last cable connector.

ANSI Standard X3T10/1143D contains additional details about SCSI bus terminator and terminator power requirements.

9.9Terminator power

N drives

You can configure terminator power in four different ways. See Section 8.1 for illustrations that show how to place jumpers enabling each of the following terminator power configurations:

1.Drive accepts terminator power through SCSI bus pin 26 on N models.

2.Drive supplies power to the SCSI bus.

3.Drive provides terminator power for optional internal terminator resistors using the drive’s power connector.

4.Drive provides power to its own terminators and to the SCSI bus terminator power line.

SCSI devices providing terminator power (TERMPWR) must have the following characteristics:

8-bit SCSI:

V TERM = 4.25 V to 5.25 V

800 mA minimum source drive capability

1.0A maximum

16-bit SCSI:

V TERM = 4.25 V to 5.25 V

1,500 mA minimum source drive capability

3.0 A maximum

LW drives

You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device supply terminator power to the external terminator. See Section 8.1 for illustrations that show how to place jumpers for this configuration.

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Contents Product Manual, Volume Page Product Manual, Volume Page Revision status summary sheet Revision Date Writer/Engineer Sheets AffectedPage Contents Seagate Technology support services Defect and error managementInstallation Interface requirementsList of Figures Barracuda 36ES2 Product Manual, Rev. B ViiPage Scope Barracuda 36ES2 family drive ST336938LW shownBarracuda 36ES2 Product Manual, Rev. B Applicable standards and reference documentation Korean MIC Australian C-TickTaiwanese Bsmi General description Performance Standard featuresMedia characteristics ReliabilityOptions factory installed Factory installed accessoriesProgrammable drive capacity Performance characteristics Start/stop time Ultra2 Scsi Ultra160 ScsiPrefetch/multi-segmented cache control Cache operation Caching write dataPrefetch operation Barracuda 36ES2 Product Manual, Rev. B Reliability specifications Service life Reliability and servicePreventive maintenance Service philosophy7 S.M.A.R.T Controlling S.M.A.R.TDetermining rate Performance impactReporting control Predictive failuresImplementation State of the drive prior to testingDST Failure Definition Invoking DSTExtended test Function Code 010b Product warrantyShort test Function Code 001b Log page entriesProduct repair and return information Barracuda 36ES2 Product Manual, Rev. B AC power requirements Physical/electrical specificationsDC power requirements Conducted noise immunity Power sequencing3 12 V Current profile +5 Volt Current during spindle start Typical Amper es Amps Power dissipation ST336938/ST318438 Barracuda 36ES2 Product Manual, Rev. B ST336918/ST318418 Temperature Environmental limitsShock and vibration Barracuda 36ES2 Product Manual, Rev. B Relative humidityEffective altitude sea level ShockRecommended mounting Barracuda 36ES2 Product Manual, Rev. B Vibration Air cleanlinessAcoustics Mechanical specifications Dimension TableMounting configuration dimensions Barracuda 36ES2 Product Manual, Rev. B Drive error recovery procedures Defect and error managementDrive internal defects Scsi systems errors Formatting InstallationConfigure drive options Drive ID/option select headerDo not install jumpers retain cover J6 jumper header for N model J5 jumper header on LW models only J2 option select header for LW models Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Function description Cooling Drive orientationAir flow Barracuda 36ES2 Product Manual, Rev. B Drive mounting GroundingBarracuda 36ES2 Product Manual, Rev. B Interface requirements Scsi interface messages supportedScsi interface commands supported Commands supported by Barracuda 36ES2 family drives Barracuda 36ES2 Product Manual, Rev. B Vendor ID Implemented operating definition page 81h Inquiry Vital Product dataUnit serial number page 80h Firmware numbers page C0hJumper settings page C2h Mode Sense data DEF CHG Barracuda 36ES2 Product Manual, Rev. B Condition/features supported Supported Status supported 2 REQ/ACK offset DC cable and connectorPhysical interface Model drive physical interface 50-pin Scsi I/O connector Pin Power Scsi interface physical description Scsi interface cable requirementsBarracuda 36ES2 Product Manual, Rev. B Mating connectors Mating connectors for N model drivesScsi daisy chain interface cabling for N drives Nonshielded 68 pin Scsi device connector used on LW drives Scsi daisy chain interface cabling for LW drives GND GND DBP1 +DBP1 Electrical description Multimode signalsMultimode-SE and LVD alternatives Input characteristics LVD output signalsSingle-ended drivers/receivers for N models Transmitter characteristicsReceiver characteristics Single-ended drivers/receivers for LW modelsGeneral cable characteristics Low voltage differential I/O circuitsTerminator requirements Terminator power DrivesLW drives Page Drive activity LED Following table provides drive activity LED statusPresales Support Seagate Technology support services Online ServicesAutomated Services Technical SupportUSA/Canada/Latin America Support Services Customer Service CSOEuropean Support Services Asia/Pacific Support Services Africa/Middle East Support ServicesCall Center Toll-free Direct dial Barracuda 36ES2 Product Manual, Rev. B Index Diffsens LED PCB System chassis Barracuda 36ES2 Product Manual, Rev. B
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