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Seagate ST336918N, ST318418N, ST318438LW Output characteristics, Input characteristics, voltage

Models: ST318438LW ST336938LW ST336918N ST318418N

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Output characteristics

Barracuda 36ES2 Product Manual, Rev. B

69

Output characteristics

Each signal (Vs) driven by LVD interface drivers shall have the following output characteristics when measured at the disc drive connector:

Steady state Low level output voltage* = –.95 V = < Vs = < –1.55 V (signal negation/logic 0)
Steady state High level output voltage* = –.95 V = < Vs = < 1.55 V (signal assertion/logic 1)

					voltage		ranges 0.700 V = < Vcm = < 1.800 V.

Differential voltage = +0.6 V minimum with common-mode
*These voltages shall be measured between the output terminal and							the SCSI device’s logic ground reference.



The output characteristics shall additionally conform to EIA RS-485.

Figure 22. LVD output signals

Input characteristics

Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics when measured at the disk drive connector:

Steady state Low level output voltage* = 0.030 V = < Vs = < 3.6 V (signal negation/logic 0) Steady state High level output voltage* = –3.6 V = < Vs = < –0.030 V (signal assertion/logic 1)

Differential voltage = +0.30 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V. (X3T10/1302D)

*These voltages shall be measured between theoutput terminal and theSCSI device’s logic ground reference.

Input characteristics shall additionally conform to EIARS-485-983.

Manual background

Figure 23. Typical SE-LVD alternative transmitter receiver circuits

Image 79

Seagate ST336918N manual Output characteristics, Input characteristics, Barracuda 36ES2 Product Manual, Rev. B, voltage

Contents

ST336938LW Product Manual, VolumeBarracuda 36ES2 Family ST336918NPage ST336938LW Product Manual, VolumeBarracuda 36ES2 Family ST336918NPage Writer/Engineer Revision status summary sheetRevision DatePage 6.0 Physical/electrical specifications Contents4.0 Performance characteristics 5.0 Reliability specifications9.0 Interface requirements 7.0 Defect and error management8.0 Installation 10.0 Seagate Technology support servicesBarracuda 36ES2 Product Manual, Rev. B List of FiguresPage Barracuda 36ES2 Product Manual, Rev. B 1.0 ScopeFigure 1. Barracuda 36ES2 family drive ST336938LW shown Barracuda 36ES2 Product Manual, Rev. B 2.1.2 Electromagnetic susceptibility 2.0 Applicable standards and reference documentation2.1 Standards 2.1.1 Electromagnetic compatibilityReference documents Australian C-TickKorean MIC Taiwanese BSMIBarracuda 36ES2 Product Manual, Rev. B 3.0 General description3.4 Reliability 3.1 Standard features3.2 Media characteristics 3.3 Performance3.6 Programmable drive capacity 3.7 Factory installed accessories3.8 Options factory installed 3.5 Unformatted and formatted capacities4.2.1 Access time 4.0 Performance characteristics4.1 Internal drive characteristics transparent to user 4.2 SCSI performance characteristics visible to user4.3 Start/stop time Ultra2 SCSIUltra160 SCSI Notes for SectionBarracuda 36ES2 Product Manual, Rev. B 4.5 Cache operation4.5.1 Caching write data In general, 2,048 Kbytes of the physical buffer space in the drive can be used as storage space for cache oper- ations. The buffer can be divided into logical segments Mode Select Page 08h, byte 13 from which data is read and to which data is written. The drive maintains a table of logical block disk medium addresses of the data stored in each segment of the buffer. If cache operation is enabled RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI Interface Product Manual, part number 75789509, data requested by the host with a Read command is retrieved from the buffer if it is there, before any disc access is initiated. If cache operation is not enabled, the buffer still segmented with required number of segments is still used, but only as circular buffer segments during disc medium read operations disregarding Prefetch operation for the moment. That is, the drive does not check in the buffer segments for the requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. On a cache miss, all data transfers to the host are in accordance with buffer-full ratio rules. On a cache hit the drive ignores the buffer-full ratio rules. See explanations associated with Mode page 02h disconnect/reconnect control in the SCSI Interface Product ManualTables 8 and 9 show Mode default settings for the drives 4.5.2 Prefetch operationBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B 5.1.3 Write errors 5.0 Reliability specifications5.1 Error rates 5.1.2 Read errors5.2.4 Service philosophy 5.2 Reliability and service5.2.2 Preventive maintenance 5.2.3 Service lifeCase 1 - All bus devices powered off during removal or insertion 5.2.6 Hot plugging Barracuda 36ES2 disc drives5.2.7 S.M.A.R.T Controlling S.M.A.R.TPredictive failures Performance impactReporting control Determining rate5.2.8.2.2 Invoking DST 5.2.8.2.1 State of the drive prior to testing5.2.8.1 DST Failure Definition 5.2.8.2 Implementation5.2.8.2.4 Log page entries 5.2.9 Product warrantyShort test Function Code 001b Extended test Function Code 010bBarracuda 36ES2 Product Manual, Rev. B Product repair and return informationSeagate repair centers may refuse receipt of components improperly packaged or obviously damaged in tran- sit. Contact your Authorized Seagate Distributor to purchase additional boxes. Seagate recommends shipping by an air-ride carrier experienced in handling computer equipment Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B 6.0 Physical/electrical specifications6.1 AC power requirements 6.2 DC power requirementsBarracuda 36ES2 Product Manual, Rev. B 6.2.2 Power sequencing6.2.1 Conducted noise immunity 6.2.3 12 V - Current profileNominal average DC curve Barracuda 36ES2 Product Manual, Rev. B+5 Volt Current during spindle start - Typical Amper es AmpsWatts 6.3 Power dissipation ST336938/ST318438Barracuda 36ES2 Product Manual, Rev. B AmperesWatts ST336918/ST318418Barracuda 36ES2 Product Manual, Rev. B Amperesa. Operating 6.4.1 Temperature6.4 Environmental limits Barracuda 36ES2 Product Manual, Rev. B6.4.4.1 Shock 6.4.2 Relative humidity6.4.3 Effective altitude sea level 6.4.4 Shock and vibrationFigure 7. Recommended mounting Barracuda 36ES2 Product Manual, Rev. BZ X YZ Y X 6.4.7 Electromagnetic susceptibility 6.4.5 Air cleanliness6.4.4.2 Vibration 6.4.6 AcousticsBarracuda 36ES2 Product Manual, Rev. B 6.5 Mechanical specificationsHeight Dimension Table Figure 9. N mounting configuration dimensionsBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B 7.0 Defect and error management7.2 Drive error recovery procedures 7.1 Drive internal defectsBarracuda 36ES2 Product Manual, Rev. B 7.3 SCSI systems errors1 These values are subject to change 8.1 Drive ID/option select header 8.0 InstallationConfigure drive options FormattingDo not install jumpers retain cover Shipped with cover installedBarracuda 36ES2 Product Manual, Rev. B Drive Activity LED Shipped with cover installedDo not install jumpers retain cover Barracuda 36ES2 Product Manual, Rev. BUsage Plug Barracuda 36ES2 Product Manual, Rev. BHost AlternateJumper Positions Barracuda 36ES2 Product Manual, Rev. BFigure 13. J2 option select header for LW models Figure 14. J2 option select header for N models2 These signals are also on J1 I/O connector J5, Pins 1-12. See Figure 8.1.1 Notes for Figures 14 throughBarracuda 36ES2 Product Manual, Rev. B jumper 8.1.2 Function descriptioninstallation Barracuda 36ES2 Product Manual, Rev. BBarracuda 36ES2 Product Manual, Rev. B 8.1.3 Drive orientation8.2 Cooling 8.2.1 Air flowk * x = F 15lb = 67N 8.3 Drive mounting8.4 Grounding Barracuda 36ES2 Product Manual, Rev. BBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B 9.0 Interface requirements9.1 General description 9.2 SCSI interface messages supportedBarracuda 36ES2 Product Manual, Rev. B 9.3 SCSI interface commands supportedBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Data HEX Barracuda 36ES2 Product Manual, Rev. BTable 6 Barracuda 36ES2 family drive Standard Inquiry data BytesFirmware numbers page C0h 9.3.1 Inquiry Vital Product dataUnit serial number page 80h Implemented operating definition page 81hBarracuda 36ES2 Product Manual, Rev. B Jumper settings page C2hThe Mode Sense command provides a means for the drive to report its operating parameters to the initiator. The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change- able values 9.3.2 Mode Sense dataBarracuda 36ES2 Product Manual, Rev. B Definitions Barracuda 36ES2 Product Manual, Rev. BBarracuda 36ES2 Product Manual, Rev. B Mode Page 10 Byte Header Data and Parameter Data BytesCondition/features supported 9.4 SCSI bus conditions and miscellaneous features supportedBarracuda 36ES2 Product Manual, Rev. B Supported Conditions or featureBarracuda 36ES2 Product Manual, Rev. B Supported9.5.2 REQ/ACK offset 9.6.1 DC cable and connector9.5 Synchronous data transfer 9.5.1 Synchronous data transfer periods supportedPower Figure 16. N model drive physical interface 50-pin SCSI I/O connectorBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B PowerTable 12 Interface transfer rates supported 9.6.2 SCSI interface physical description9.6.3 SCSI interface cable requirements Barracuda 36ES2 Product Manual, Rev. BMating panel mount connector 3M -CHE-2050-J01A10-KLE 9.6.4 Mating connectors9.6.4.1 Mating connectors for N model drives with adjacent pins 100 mils apart. The connector is keyed see FigureBarracuda 36ES2 Product Manual, Rev. B 1 Closed end type 50-pin connector used. Terminators enabledBarracuda 36ES2 Product Manual, Rev. B 9.6.4.2 Mating connectors for LW model drivesadapter for Pin 1 location Barracuda 36ES2 Product Manual, Rev. BFigure 21. SCSI daisy chain interface cabling for LW drives check yourBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B 9.7.1 Multimode-SE and LVD alternatives Multimode signalsNotes for Tables 13 through 9.7 Electrical descriptionvoltage Output characteristicsInput characteristics Barracuda 36ES2 Product Manual, Rev. B9.7.1.2 Single-ended drivers/receivers for LW models Transmitter characteristicsReceiver characteristics 9.7.1.1 Single-ended drivers/receivers for N modelsOther signals 9.7.1.4 General cable characteristics9.7.1.3 Low voltage differential I/O circuits Table 16 Cable characteristics for single-ended circuits1. Drive accepts terminator power through SCSI bus pin 26 on N models 9.9 Terminator power N drives9.8 Terminator requirements LW drivesDisc drive SCSI timing 9.10Barracuda 36ES2 Product Manual, Rev. B Format with Immediate option on 9.11 Drive activity LEDPowered down by removal of DC power Barracuda 36ES2 Product Manual, Rev. BTechnical Support 10.0 Seagate Technology support services Online ServicesAutomated Services Presales SupportWarranty Service Customer Service CSOUSA/Canada/Latin America Support Services European Support ServicesWarranty Service Africa/Middle East Support ServicesAsia/Pacific Support Services FAX Services-All European CountriesBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B SymbolsIndex NumericsBarracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B X3T10/1143D write error 13 unrecoverableBarracuda 36ES2 Product Manual, Rev. B write operation 10 write protect 41 write retry countPage 920 Disc Drive, Scotts Valley, California 95066-4544, USA Seagate Technology LLCPublication Number 100182971, Rev. B, Printed in USA