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Fujitsu MHW2120BS, MHW2100BS, MHW2080BS, MHW2040BS, MHW2060BS Servo Control, Servo control circuit

Models: MHW2040BS MHW2100BS MHW2060BS MHW2120BS MHW2080BS

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4.7 Servo Control

4.7 Servo Control

The actuator motor and the spindle motor are submitted to servo control. The actuator motor is controlled for moving and positioning the head to the track containing the desired data. To turn the disk at a constant velocity, the actuator motor is controlled according to the servo data that is written on the data side beforehand.

4.7.1 Servo control circuit

Figure 4.6 is the block diagram of the servo control circuit. The following describes the functions of the blocks:

	(1)
	MPU/HDC/RDC
	(2)
Head	Servo	MPU
	burst	core
	capture

Position Sense

CSR: Current Sense Resister

VCM: Voice Coil Motor

(3)	SVC
(3)	(4)
DAC	Power	VCM current
	Amp
	(7)	CSR
		VCM
(5)	(6)
Spindle	Driver	Spindle
motor		motor
control

Figure 4.6 Block diagram of servo control circuit

C141-E249

4-13

Image 67

Fujitsu MHW2120BS, MHW2100BS, MHW2080BS, MHW2040BS, MHW2060BS manual Servo Control, Servo control circuit

Contents

Disk Drives Product Manual Handling of This Manual For Safe OperationRevision History This page is intentionally left blank Overview of Manual Operating Environment Conventions for Alert MessagesConventions Liability Exception This page is intentionally left blank Important Alert Messages Important Alert ItemsThis page is intentionally left blank Disk Drives Product Manual Disk Drives Maintenance ManualThis page is intentionally left blank Contents Theory of Device Operation Installation ConditionsInterface Contents101 Operations AB-1 GL-1IN-1 Illustrations 171 Tables Recommended connector specifications for the host106 Device Overview Functions and performance FeaturesAdaptability Connection to Sata interface Error correction and retry by ECCLow noise and vibration High resistance against shockSpecifications summary Device SpecificationsSpecifications 1/2 Examples of model names and product numbers Model and product numberSlope of an input voltage at rise Power RequirementsInput Voltage RipplePower Requirements Current and power dissipation Current Requirements and Power DissipationCurrent fluctuation Typ. at +5 V when power is turned on Environmental SpecificationsEnvironmental specifications Shock and Vibration Acoustic noise specificationShock and vibration specification Acoustic NoiseMean time to repair Mttr Service lifeData assurance in the event of power failure MTBF=Media Defects Error RateUnrecoverable read error Positioning errorRecommended power-off sequence Advanced Power Management APMAdvanced Power Management Host-initiated interface power management Hipm Interface Power Management IPMDevice-initiated interface power management Dipm Interface power management Device Configuration Device Configuration Read/write circuit System ConfigurationSata interface Drive connectionThis page is intentionally left blank Installation Conditions Dimensions DimensionsOrientation MountingFrame PCA Limitation of mountingLocation of breather Ambient temperature Handling cautions Service areaHios ESDConnections with Host System Device connectorSignal segment and power supply segment Connector specifications for host systemRecommended connector specifications for the host system Sata interface cable connection This page is intentionally left blank Theory of Device Operation Spindle OutlineSubassemblies DiskSpindle motor driver circuit Circuit ConfigurationAir filter Servo circuitPower supply configuration PCA Power-on Sequence Power-on operation sequence Self-calibration Self-calibration contentsExecution timing of self-calibration Command processing during self-calibrationWrite precompensation Read/write CircuitRead/write preamplifier PreAMP Write circuitAGC circuit Read circuitProgrammable filter circuit Viterbi detection circuit Digital PLL circuitFIR circuit D converter circuitServo control circuit Servo ControlA converter DAC Power amplifierMicroprocessor unit MPU Servo burst capture circuitData-surface servo format Physical sector servo configuration on disk surface Servo frame format Track following operation Actuator motor controlOperation to move the head to the reference cylinder Seek operationSpindle motor control Start modeAcceleration mode Stable rotation modeThis page is intentionally left blank Interface Physical Interface Interface signalsComwake Comreset / Cominit5VDC/GND Out of band signaling Signal interface regulationPmack AlignCont EOFSOF RIPROK RrdyFER Electrical specificationsPhysical Layer Electrical Requirements 2/3 Physical Layer Electrical Requirements 3/3 COMINIT/COMRESETConnector pinouts Connector pinoutsRequirements for P11 as an output pin 5 P11 functionStaggered Spin-up Driving Ready LEDExample of the circuit for driving Ready LED Hot Plug Logical Interface Conceptual diagram of communication layersTransport layer Communication layersPhysical layer Link layerShadow Block Register Outline of the Shadow Block RegisterRegister Host to Device FIS layout Outline of the frame information structure FISFIS types 3.2DMA Active Device to Host Register Device to HostTAG DMA Setup Device to Host or Host to Device BidirectionalBist combinations Bist Active BidirectionalData Host to Device or Device to Host Bidirectional PIO Setup Device to HostData FIS Bidirectional layout Block at the conclusion of all subsequent Data to Device 11 Set Device Bits FIS Set Device Bits Device to HostShadow block registers Error FieldUNC Cylinder Low Field exp Features Field expSector Count Field exp Sector Number Field expHS3 Cylinder High Field expDevice/Head Field HS3 HS2 HS1 HS0Bit 7 Busy BSY bit Bit Device Write Fault DF bitBit Error ERR bit Status fieldEStatus Field Command FieldBit 2 Software Reset Srst Device Control FieldCommand code and parameters Host CommandsCommand code and parameters 1/3 Command code and parameters 2/3 Command code and parameters 3/3 Command descriptions Recalibrate X’10’ to X’1F’ Error reporting conditionsRead Sectors X’20’ or X’21’ LBA LSB LBAWrite Sectors X’30’ or X’31’ 00 *1 Error information Write Verify X’3C’ Host Commands Read Verify Sectors X’40’ or X’41’ Host Commands Seek X’70’ to X’7F’ Diagnostic code Execute Device Diagnostic X’90’Initialize Device Parameters X’91’ Operation of Download Microcode Download Microcode X’92’Error reporting conditions Standby Immediate X’94’ or X’E0’ Interface Unload Feature Unload Immediate Command Standby X’96’ or X’E2’ Idle X’97’ or X’E3’ Interface ’FF’ Check Power Mode X’98’ or X’E5’Sleep X’99’ or X’E6’ ComresetSmart X’B0’ 10 Features Field values subcommands and functions 1/3 Smart Write LOG 10 Features Field values subcommands and functions 2/3Smart Enable Operations Smart Read LOG’DA’ Smart Return Status 10 Features Field values subcommands and functions 3/3Smart Disable Operations ’DB’ Smart ENABLE/DISABLE Auto OFF-LINEKey C2h 11 Format of device attribute value data 12 Format of guarantee failure threshold value data1FF Attribute ID Data format version numberRaw attribute value Status FlagCurrent attribute value Attribute value for the worst case so farSelf-test execution status 13 Off-line data collection status14 Self-test execution status 15 Off-line data collection capability 17 Drive error logging capability16 Failure prediction capability flag 18 Log Directory Data Format Guarantee failure thresholdSmart error logging Checksum19 Data format of Smart Summary Error Log 1/2 Total number of drive errors 19 Data format of Smart Summary Error Log 2/2Command data structure Error data structureSmart Self-Test 20 Data format of Smart Comprehensive Error LogSelf-test index Self-test numberTest Span 22 Selective self-test log data structureCurrent LBA under test Selective Self-test pending time min Feature Flags23 Selective self-test feature flags Current Span under test24 SCT command and the function Smart Command Transport SCTSCT Status Request SN = E0h, FR = D5h SET MAX EXT, DCO 25 Format of SCT Status Response 1/225 Format of SCT Status Response 2/2 26 SCT Status code SCT Command SET SN = E0h, FR = D6 28 Write Same 1/2 27 Action code28 Write Same 2/2 29 Error Recovery ControlFeature Control Command 30 Feature Control Command31 SCT Data Table 32 had Temperature SCT Read Data SN = E1h, FR = D5 SCT Write Data SN = E1h, FR = D6 Device Configuration Identify Device Configuration XB1Device Configuration Restore Device Configuration FreezeDevice Configuration Freeze Lock Features Field = C1h Device Configuration Restore Features Field = C0hDevice Configuration SET Features Field = C3h Device Configuration Identify Features Field = C2hWord Value Content 33 Device Configuration Identify data structure 1/233 Device Configuration Identify data structure 2/2 Read Multiple X’C4’ 12 Execution example of Read Multiple command Start sector No Write Multiple X’C5’ Start sector No SET Multiple Mode X’C6’ Interface Read DMA X’C8’ or X’C9’ LSB / LBA MSB / LBAWrite DMA X’CA’ or X’CB’ Interface Read Buffer X’E4’ Flush Cache X’E7’ Write Buffer X’E8’ Identify Device X’EC’ Identify Device DMA X’EE’ ’3FFF’ 34 Information to be read by Identify Device command 1/334 Information to be read by Identify Device command 2/3 34 Information to be read by Identify Device command 3/3 MHW2120BS MHW2100BS MHW2080BS MHW2060BS MHW2040BS ’3FFF’ Command without interrupt supports 2, 4, 8 and 16 sectors Host Commands Interface C141-E249 113 Interface C141-E249 115 Bit = Supports the Mode Word C141-E249 117 = SCT Error Recovery Control supported 35 Features field values and settable modes 1/2 SET Features X’EF’35 Features field values and settable modes 2/2 See Table Data Transfer Mode Advanced Power Management APM Serial ATA Functions 36 Write-Read-Verify feature sector counts Write-Read-Verify feature optionalAutomatic Acoustic Management AAM 37 Contents of Security SET Password data Error reporting conditions When the user password is selected When the master password is selectedSecurity UNLOCKX’F2’ Host Commands Security Erase Prepare X’F3’ Security Erase Unit X’F4’ Security Freeze Lock X’F5’ Error reporting conditions 39 Contents of security password Error reporting conditions Lbalsb Read Native MAX Address X’F8’SET MAX Address SET MAX X’F9’SET MAX SET Password Features Field = 01h Password information DH CH CL SN SC ER SET MAX Lock Features Field = 02hSET MAX Unlock Features Field = 03h SET MAX Freeze Lock Features Field = 04h CL EXP Read Sector S EXT X’24’ DescriptionSN EXP Read DMA EXT X’25’ Description Read Native MAX Address EXT X’27’ Read Multiple EXT X’29’ Read LOG EXT X2F CL EXP SN EXP 41 Tag field information 40 Data format of Read Log Ext log page 10h43 Counter Identifier information 42 Data format of Read Log Ext log page 11hSC EXP SCT Status Request SN = E0hError information 152 C141-E249 Write Sector S EXT X’34’ Description Write DMA EXT X’35’ Description SET MAX Address EXT X’37’ SET MAX LBA Write Multiple EXT X’39’ Write LOG EXT X3F Error information C141-E249 159 SCT Command SET SN = E0h SCT Write Data SN = E1h Read Verify Sector S EXT X’42’ Flush Cache EXT X’EA’ Write Multiple FUA EXT XCE Write DMA FUA EXT X3D Read FP DMA Queued Write FP DMA Queued Sfrw Sfrr Error posting44 Command code and parameters 1/2 Command Name44 Command code and parameters 2/2 Data Command ProtocolNon-data command protocol Execute Device Diagnostic Initialize Device ParametersHost PIO data-in command protocol 14 PIO data-in command protocol PIO data-out command protocol15 PIO data-out command protocol Read DMA EXT Identfy Device Identfy Device DMA DMA data-in command protocolWrite DMA EXT FUA EXT DMA data-out command protocolRead FP DMA Queued Write FP DMA Queued Native Command Queuing protocol18 Read FP DMA Queued command protocol 19 Write FP DMA Queued command protocol 20 Power-on sequence Power-on and Comreset21 Comreset sequence This page is intentionally left blank Operations Response to power-on Reset and DiagnosisReset and Diagnosis Response to Comreset Response to ComresetComreset preservation requirements Software settings preservationSET Address MAX EXT Response to a software reset Response to a software resetActive idle mode Power SavePower save mode Active modeSleep mode Standby modePower commands Power save mode of the interface Power Save Controlled by Interface Power Management IPMPartial mode Slumber mode Read Multiple EXT Read DMA EXT Read FP DMA Queued Read-ahead CacheData buffer structure Example of 8 MB bufferCaching operation Commands that are targets of cachingData that is a target of caching Invalidating caching-target data Miss-hit Using the read segment bufferSequential hit Full hit Partial hit Invalidation of cached data Command that are targets of cachingWrite Cache Cache operationEnabling and disabling Status report in the event of an errorComreset and software reset response Cashing function when power supply is turned onThis page is intentionally left blank Actuator Bios standard for drivesCommand Connector Connector Plug Host system sideMaster Device Power save modeRotational delay Host receptacleStatus Seek timeSerial-ATA Slave DeviceThis page is intentionally left blank Amnf BiosAbrt AICThis page is intentionally left blank Index Index Example of model name and product Mode Read Native MAX Address Read/write circuit block diagramSmart summary error log, data Japan Comment FormThis page is intentionally left blank C141-E249-01EN Page