Seagate ST336605LW/LC/LCV manual 2 REQ/ACK offset, Physical interface, DC cable and connector

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52	Cheetah 73LP Product Manual, Rev. E

9.5Synchronous data transfer

9.5.1Synchronous data transfer periods supported

Table 10 and Section 9.5.2 list Synchronous Data transfer periods supported by the drive. The data transfer period to be used by the drive and the initiator is established by an exchange of messages during the Message Phase of operation. See the section on message protocol in the SCSI Interface Product Manual, part number 75789509.

Table 10: Synchronous data transfer periods

	M (decimal)	Transfer period	Transfer rate
	M (decimal)	(nanoseconds)	(megatransfers/second)
		(nanoseconds)	(megatransfers/second)
	9	12.5	80.0	[1] [2]
	10	25	40.0	[1]
	12	50	20.0
	25	100	10.0
	50	200	5.0

[1]This transfer rate is only allowed when using the LVD interface.

[2]You must use the Parallel Protocol Request message with this transfer rate.

9.5.2REQ/ACK offset

The maximum value supported by the Cheetah 73LP family drives for REQ/ACK offset is 63 (3Fh).

9.6Physical interface

This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O interface. See Section 9.8 and Section 9.9 for additional terminator information.

Figures 19 and 20 show the locations of the DC power connector, SCSI interface connector, drive select head- ers, and option select headers.

Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI operational aspects of Seagate drive interfaces are given in the SCSI Interface Product Manual, part number 75789509.

9.6.1DC cable and connector

LW and LWV model drives receive DC power through a 4 pin connector (see Figure 21 for pin assignment) mounted at the rear of the main PCBA. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used.

Type of cable	Connector	Contacts (20-14 AWG)
14 AWG	MP 1-480424-0	AMP 60619-4	(Loose Piece)
		AMP 61117-4	(Strip)

LC and LCV model drives receive power through the 80-pin I/O connector. See Tables 14 and 15.

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Contents ST373405LW/LWV/LC/LCV ST336605LW/LC/LCV Page ST373405LW/LWV/LC/LCV ST336605LW/LC/LCV Page Revision status summary sheet Revision Date Writer/Engineer Sheets AffectedPage Contents Seagate Technology support services Defect and error managementInstallation Interface requirementsList of Figures Cheetah 73LP Product Manual, Rev. E ViiPage Scope Cheetah 73LP family drive ST373405LW shownCheetah 73LP Product Manual, Rev. E Applicable standards and reference documentation Taiwanese Bsmi Australian C-TickKorean MIC General description Cheetah 73LP family drive Performance Cheetah 73LP Product Manual, Rev. E Standard featuresMedia characteristics ReliabilityAccessories user installed Factory installed accessoriesOptions factory installed Unformatted and formatted capacitiesPerformance characteristics Prefetch/multi-segmented cache control Ultra2 Scsi Ultra3 ScsiStart/stop time Cheetah 73LP Product Manual, Rev. E Cache operation Caching write dataPrefetch operation Reliability specifications Service life Reliability and servicePreventive maintenance Service philosophy7 S.M.A.R.T Controlling S.M.A.R.TReporting control Performance impactMilliseconds Determining rateImplementation State of the drive prior to testingDST Failure Definition Invoking DSTExtended test Function Code 010b Short and extended testsShort test Function Code 001b Log page entriesProduct repair and return information Cheetah 73LP Product Manual, Rev. E Product warrantyShipping Cheetah 73LP Product Manual, Rev. E DC power requirements Physical/electrical specificationsAC power requirements 3 12 V Current profile Power sequencingConducted noise immunity Typical ST336605 drive +12 V current profile Typical ST336605 drive +5 V current profile Amperes 000 900 800 700 600 Relative humidity TemperatureCheetah 73LP Product Manual, Rev. E Environmental limits Effective altitude sea levelShock and vibration ShockRecommended mounting Acoustics Air cleanlinessVibration LW and LWV mounting configuration dimensions LC and LCV mounting configuration dimensions Drive internal defects Defect and error managementDrive error recovery procedures Scsi systems errors Formatting InstallationConfigure drive options Drive ID/option select headerDo not install jumpers retain cover J5 jumper header on LW/LWV models only J2 option select header Cheetah 73LP Product Manual, Rev. E Function description Does not apply to LC/LCV modelDrive orientation CoolingCheetah 73LP Product Manual, Rev. E Drive mounting GroundingCheetah 73LP Product Manual, Rev. E Interface requirements Scsi interface messages supportedScsi interface commands supported Cheetah 73LP Product Manual, Rev. E Cheetah 73LP Product Manual, Rev. E Inquiry Vital Product data Mode Sense data DEF CHG Cheetah 73LP Product Manual, Rev. E Condition/feature supported by Physical interface DC cable and connector2 REQ/ACK offset Pin Power Scsi interface physical description Scsi interface cable requirementsMating connectors for LC and LCV model drives Mating connectorsMating connectors for LW and LWV model drives ST373405LC/LCV and ST336605LC/LCVCheetah 73LP Product Manual, Rev. E Right-angle to Pcba connectors Scsi ID650±.005 155 100 346 Front View GND +DBP1 62Cheetah 73LP Product Manual, Rev. E REQ +REQ Multimode-SE and LVD alternatives LVD output characteristicsElectrical description General cable characteristics Single-ended drivers/receiversCables for low voltage differential drivers/receivers Terminator requirementsLC and LCV drives Disc drive Scsi timing Spindle status Command status LED status Drive activity LEDCheetah 73LP Product Manual, Rev. E Presales Support Seagate Technology support services Online ServicesAutomated Services Technical SupportEuropean Support Services Customer Service CSOUSA/Canada/Latin America Support Services Call Center Toll-free Direct dial Africa/Middle East Support ServicesAsia/Pacific Support Services Cheetah 73LP Product Manual, Rev. E Index Cheetah 73LP Product Manual, Rev. E Cheetah 73LP Product Manual, Rev. E Scam Scsi Scsi ID 80Cheetah 73LP Product Manual, Rev. E