Seagate ST336938LW Electrical description, Multimode-SE and LVD alternatives, Multimode signals

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Barracuda 36ES2 Product Manual, Rev. B

Notes [ ] for Tables 13 through 15.

[1]See Section 9.6.4.2 for detailed electrical characteristics of these signals.

[2]The conductor number refers to the conductor position when using 0.025-inch (0.635 mm) centerline flat ribbon cable. Other cables types may be used to implement equivalent contact assignments.

[3]Connector contacts are on 0.050 inch (1.27 mm) centers.

[4]Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator.

[5]Asserted by host to enable Motor Start option (enables starting motor via SCSI bus command).

[6]Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay of 12 sec- onds times drive ID). This and [3] above are mutually exclusive options.

[7]Binary code on A3, A2, A1 and A0 asserted by host to set up SCSI bus ID in drive.

[8]GND provides a means for differential devices to detect the presence of a single ended device on the bus. Drive will not operate I/O bus at Ultra2 SCSI data rates if this is grounded.

[9]Signals [4] through [7] are used in place of installing jumpers and cables on option select connectors J2 and J6. See Section 8.1.1 notes.

[10]“NC” means no connection.

[11]8 bit devices which are connected to the 16 data bit LVD I/O shall leave the following signals open: –DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.

8 bit devices which are connected to the 16 data bit single-ended (SE) I/O shall have the following signals open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.

All other signals should be connected as shown.

[12]The conductor number refers to the conductor position (right to left in Figure 18) when using 0.050-inch (1.27 mm) centerline flat ribbon cable. Other cable types may be used to implement equivalent contact assignments.

[13]Connector contacts are on 0.100-inch (2.54 mm) centers.

9.7Electrical description

Barracuda 36ES2 LW model drives are multimode devices. That is, their I/O circuits can operate as either sin- gle-ended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).

See ANSI Standard X3T10/1302D for details electrical specifications.

9.7.1Multimode—SE and LVD alternatives

When the interface “DIFFSNS” line is between +0.35 V and +0.5 V, the drive interface circuits operate single- ended and up to and including 20 M transfers/s (Fast-20 or Ultra SCSI). When “DIFFSNS” is between +0.7 V and +1.9 V, the drive interface circuits operate low voltage differential and up to and including 160 M transfers/ s or less (Fast-160 or Ultra160 SCSI).

This multimode design does not allow dynamically changing transmission modes. Drives must operate only in the mode for which the installation and interface cabling is designed. Multimode I/O circuits used by these drives do not operate at high voltage differential levels and should never be exposed to high voltage differential environments unless the common mode voltages in the environment are controlled to safe levels for single- ended and low voltage differential devices (see the ANSI SPI-3 specification X3T10/1302D).

Multimode signals

Multimode circuit SE alternative signal characteristics are the same as described elsewhere in Section 9.7.1. The SE alternative for these circuits is selected as described above. SE cables and termination must be used.

LW model drives do not have onboard terminators. The Multimode signal lines (either SE or LVD) should be terminated with 110 ohm active terminator circuits at each end of the total cable. Termination of the I/O lines must be provided for by the Host equipment designers or end users.

The SE and differential alternatives are mutually exclusive.

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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 Australian C-Tick Korean MICTaiwanese Bsmi General description Performance Standard featuresMedia characteristics ReliabilityFactory installed accessories Options factory installedProgrammable drive capacity Performance characteristics Ultra2 Scsi Ultra160 Scsi Start/stop timePrefetch/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 Physical/electrical specifications AC power requirementsDC power requirements Power sequencing Conducted noise immunity3 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 Air cleanliness Barracuda 36ES2 Product Manual, Rev. B VibrationAcoustics Mechanical specifications Dimension TableMounting configuration dimensions Barracuda 36ES2 Product Manual, Rev. B Defect and error management Drive error recovery proceduresDrive 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 Drive orientation CoolingAir 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 DC cable and connector 2 REQ/ACK offsetPhysical 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 Multimode signals Electrical descriptionMultimode-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 power Drives Terminator requirementsLW drives Page Drive activity LED Following table provides drive activity LED statusPresales Support Seagate Technology support services Online ServicesAutomated Services Technical SupportCustomer Service CSO USA/Canada/Latin America Support ServicesEuropean Support Services Africa/Middle East Support Services Asia/Pacific 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