Seagate ST43400N/ND user manual Synchronizing the spindle, System diagram for spindle sync

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Installation

29

 

 

Synchronizing the spindle

The spindle sync feature makes it possible to synchronize the spindle rotation of a group of disc drives. This reduces the latency normally encountered when the initiator switches between multiple disc drives.

Figure 14 shows two system configurations. In one type of system, one of the disc drives in the system provides the reference clock. In the other type, an external signal source provides the reference clock.

Internal Source

Spindle

SyncJ05

Cable

T

Drive

SP

Select

Plug

J05

Drive

(master)

J05

Drive

SP

 

External Source

 

 

Spindle

 

 

 

 

 

 

 

 

 

 

 

Signal Source

Sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cable

 

 

 

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J05

Drive

SP

J05

Drive

SP

32 loads

maximum

Terminator

J05

T

SP

Drive

32 loads

maximum

Terminator

J05

T

SP

Drive

Master designated by jumper or by initiator

Figure 14. System diagram for spindle sync

Image 34
Contents Elite Disc Drive ST43400N/ND Contents Preface Electrostatic discharge protectionImportant safety information and precautions ST43400N/ND User’s Manual SeaFONE 408 Technical support servicesSeaFAX 408 SeaBOARDGeneral description ST43400N/ND disc driveSize Dimensions Characteristics Conditions Specifications Page Drive functional block diagram Site requirements InstallationEnvironmental requirements Airflow requirements Suggested airflow Space requirements Mounting orientationsDimensions of the drive and power supply Power requirements Grounding requirements Interface requirementsScsi Unshielded single-ended I/O cabling Signal Name Pin Number Unshielded differential I/O cabling Signal Name Pin Number Inspection Unpacking, inspection, and repackingUnpacking RepackingInstallation procedures Setting the control board jumpersJ4A Installing the power supply Power supply installation Installing an optional bezel Attaching a bezel Mounting the drive Mounting the drive Connecting the system I/O cabling O cable attachmentTerminator attachment-single-ended I/O Grounding the system Terminator attachment-differential I/OSystem diagram for spindle sync Synchronizing the spindleJ4A Installation Verification Switches and indicators OperationSwitches and indicators Switch or Indicator Function Operating instructions Parts data Options and accessories Part Number Description Maintenance Observing maintenance precautionsArranging for depot repair Removing and replacing a driveRemoving and replacing a power supply Packing a drive for shipmentPage Maintenance Publication Number 83327630, Rev. a