IBM C1B 1.12 Brick On Sled Carrier 128-pin HPC, SSA manual Spindle Synchronization

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U S E R RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS

O E M F U N C T I O N A L S P E C I F I C A T I O N U L T R A S T A R X P ( D F H C ) SSA M O D E L S 1.12/2.25 G B - 1.0" H I G H

5.7 Spindle Synchronization

5.7.1 Synchronization overview

Spindle synchronization of drives is achieved by one node transmitting a special Sync character or a Sync pulse once per every revolution of its drive. The transmitting is done either on SSA Link (sending Sync character) or on a hard-wire (Sending Sync pulse) that connects all the drives via the SSA Option Port 'Sync' pin. Thesynchronization mode is controlled by the R P L field of the Mode Select Page 04h parameter (see Ultrastar X P ( D F H C ) S S A Models Interface Specification for more details). The drive can operate in one of three modes:

5.7.2 Synchronization Mode

Mode

Operation

No Sync

Spindle synchronization is disabled.

Slave Sync

Spindle synchronization is attempted by synchronizing the spindle motor to the Sync

 

special character on SSA link (or the Sync pulse on Sync hard-wire) that is driven by

 

another node.

Master Sync

Spindle synchronization is not attempted by this device. It generates a Sync special

 

character via SSA link (or a Sync pulse via a hard-wire) once per its spindle revo-

 

lution.

Master Sync Control

Master Sync Control is not supported.

5.7.3 Synchronization time

It will take 6 seconds to synchronize the Slave drive to the Master drive. While the Slave drive is synchro- nizing to these characters, it is not able to read or write data. Once synchronized the drive will maintain ± 20 microseconds synchronization tolerance.

When operating in Slave Sync mode, the drive must receive the Spindle Sync special characters at a period of 8.333 milliseconds with a tolerance of ± .025% (2.08 microseconds).

5.7.4 Synchronization with Offset

The Rotational Offset value is the amount of rotational skew that the Target uses when synchronized. The rotational skew is applied in the retarded direction (lagging the synchronized spindle master control). The value in the field is the numerator of a fractional multiplier that has 256 as its denominator (e.g., a value of 128 indicates a one-half revolution skew). A value of 00h indicates that rotational offset is not used. The rotational offset is only used when the Drive is running in the Slave Sync R P L mode.

5.7.5 Synchronization Route

5.7.5.1 Over SSA Link

Spindle Sync special characters are forwarded from one SSA link to the other with a delay of 350 nanoseconds with a tolerance of ± 50 nanoseconds. This delay can be increased by 50 nanoseconds when the drive is sending the second of a double character sequence ( R R or ACK) and by 50 nanoseconds when sending a SAT or SAT' character.

Source filename=SYNC

I B M Corporation

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Contents Form Factor Disk Drive Version BM Corporation Preface Source filename=STSSHEXT When Operating Limits ReliabilityContaminants Acoustic Levels Source filename=STSSHEXT General Features FeaturesInterface Controller Features DescriptionModels Reliability FeaturesGeneral SpecificationsSectors/logical block sct/lba User bytes/sector ub/sctUser bytes/logical block ub/lba Sectors/track sct/trkFor Each Notch Capacity EquationsFor Entire Drive 1 C1x Models Power Requirements by ModelInput Voltage + 5 Volts Supply + 1 2 Volts SupplyPower Calculation Examples Example 3. Power CalculationExample 1. Calculate the mean 12 volt average current Example 4. Calculate the 12 volt peak current Things to check when measuring 12 V supply currentVolt current during read/write operations C1x Models Typical 12 volt current C1x Models Typical 12 volt spin-up current C1x Models 2 C2x Models Power Calculation Examples Example 4. Calculate the 12 volt peak current Volt current during read/write operations C2x Models Typical 12 volt current C2x Models Typical 12 volt spin-up current C2x Models 3 C4x Models Power Calculation Examples Example 4. Calculate the 12 volt peak current Volt current during read/write operations C4x Models Typical 12 volt current C4x Models Typical 12 volt spin-up current C4x Models Power supply methods CxB Models4.2 DC/DC Converter Hot plug/unplug support Grounding Requirements of the Disk EnclosureM Corporation Event Nominal Maximum Bring-up Sequence and Stop TimesBring-up Sequence Times and Stop Time for C2x Models Source filename=PERFORM Environment Definition PerformanceWorkload Definition # of segments Ub/lba +Sequential Command Execution TimeRandom Basic Component DescriptionsData Transfer to/from Disk Data Transfer to/from SSA Link CommentsTheoretical Data Sector Transfer Rate Approximating Performance for Different EnvironmentsWhen Write Caching is Enabled When Read Caching is EnabledWhen Adaptive Caching is Enabled When Read-ahead is EnabledFor Queued Commands When No Seek is RequiredReordered Commands Back-To-Back CommandsSkew Cylinder to Cylinder SkewTrack to Track Skew Idle Time Functions Servo Bias Measurements Servo Run Out MeasurementsPredictive Failure Analysis Channel CalibrationCommand Timeout Limits Save Logs and PointersDisk Sweep M Corporation Mechanical Weight and DimensionsSmall Form Factor Models CxC ClearancesDimensions are in millimeters Location of Side Mounting Holes of C4C Models Source filename=MECHANIC Unitized Connector Locations Source filename=MECHANIC Carrier Models CxB Dimensions CxB Models M Corporation Handle Docking and Ejection System Auto-docking Assembly Side Rails Side Rail Positioning E D Locations front view CxB Models M Corporation Electrical Connector and Indicator LocationsElectrical Interface SSA Unitized ConnectorPin Carrier ConnectorRow SSA Link Electrical Characteristics Option Pins and IndicatorsSSA Link Cable Device Fault Pin/Indicator Option Port Pin Device Activity Pin/Indicator Option Port PinWrite Protect Option Port Pin Ground long Option Port PinEarly Power Off Warning or Power Fail Power Port Pin Front Jumper Connector12 12V Charge and 5V Charge Power Port pin 1 Programmable pin 1 Option Port PinSpindle Synchronization Over Sync Hard-wire M Corporation Source filename=RELIABLE Seek Error Rate Error DetectionPower On Hours Examples ReliabilityUseful Life Power on/off cyclesMaximum on/off cycles Product LifeMean Time Between Failure *MTBF Install Defect FreeSpql Shipped product quality level Sample Failure Rate ProjectionsConnector Insertion Cycles Periodic MaintenanceInstall Defect Free percentage Percent ESD ProtectionOperating Limits Temperature Measurement PointsP F E T Maximum ReliabilityVibration and Shock Temperature Measurement Points for all Models bottom viewDrive Mounting Guidelines Output Vibration LimitsOperating Vibration V4S Nonoperating VibrationContaminants Operating ShockNonoperating Shock Acoustic Levels Upper Limit Sound Power Requirements Bels for C4x ModelsSource filename=STANDARD Safety StandardsElectromagnetic Compatibility EMC M Corporation Serial Storage Architecture S S a P H Transport Bibliography
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