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Fujitsu MHV2100BH, MHV2080BH, MHV2040BH, MHV2060BH manual Servo Control, Servo control circuit

Models: MHV2100BH MHV2040BH MHV2060BH MHV2080BH

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Theory of Device Operation

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

4-12

C141-E224

Image 68

Fujitsu MHV2100BH, MHV2080BH, MHV2040BH, MHV2060BH manual Servo Control, Servo control circuit

Contents

MHV2100BH, MHV2080BH MHV2060BH, MHV2040BH Disk Drives Product ManualFor Safe Operation Handling of This ManualRevision History This page is intentionally left blank Preface Overview of ManualConventions Conventions for Alert MessagesOperating Environment Liability Exception This page is intentionally left blank Important Alert Items Important Alert MessagesThis page is intentionally left blank Disk Drives Product Manual Disk Drives Maintenance ManualManual Organization This page is intentionally left blank Contents Theory of Device Operation Device ConfigurationInstallation Conditions Contents Interface3.1 101 Power Save Controlled by Interface Power Management IPM OperationsGlossary GL-1 Acronyms and Abbreviations AB-1 Index IN-1 Illustrations FiguresResponse to power-on when the host is powered on Tables Examples of model names and product numbersRelationship between combination of Identifier This page is intentionally left blank Device Overview Adaptability FeaturesFunctions and performance Error correction and retry by ECC Low noise and vibrationHigh resistance against shock Connection to Sata interfaceDevice Specifications Specifications summarySpecifications 1 MHV2100BH MHV2080BH MHV2060BH MHV2040BHSpecifications 2 Model and product numberMHV2100BH Examples of model names and product numbersRipple Power RequirementsInput Voltage Current Requirements and Power Dissipation Current and power dissipationEnvironmental Specifications Current fluctuation Typ. at +5 V when power is turned onPower on/off sequence Environmental specificationsAcoustic noise specification Shock and vibration specificationAcoustic Noise Shock and VibrationService life Data assurance in the event of power failureReliability Mean time between failures MtbfError Rate Unrecoverable read errorPositioning error Media DefectsAdvanced Power Management Recommended power-off sequenceAdvanced Power Management Device-initiated interface power management Dipm Interface Power Management IPMHost-initiated interface power management Hipm Interface power management Elimination of Hazardous SubstancesThis page is intentionally left blank Device Configuration Device Configuration System Configuration Sata interfaceDrive connection Read/write circuitThis page is intentionally left blank Installation Conditions Dimensions DimensionsOrientation MountingIntegration Guidance C141-E144 PCA FrameLimitation of mounting Location of breather Ambient temperature Service area Handling cautionsHios ESDSumitomo 3M Device connector Connections with Host SystemRecommended connector specifications for the host system Connector specifications for host systemSignal segment and power supply segment Sata interface cable connection This page is intentionally left blank Theory of Device Operation Outline SubassembliesDisk SpindleCircuit Configuration Air filterServo circuit Spindle motor driver circuitPower supply configuration PCA Power-on Sequence Power-on operation sequenceSelf-calibration contents Self-calibrationCommand processing during self-calibration Execution timing of self-calibrationRead/write Circuit Read/write preamplifier PreAMPWrite circuit Write precompensationProgrammable filter circuit Read circuitAGC circuit Digital PLL circuit FIR circuitD converter circuit Viterbi detection circuitServo Control Servo control circuitPower amplifier Microprocessor unit MPUServo burst capture circuit A converter DACDriver circuit VCM current sense resistor CSRData-surface servo format Inner guard bandData area Outer guard bandPhysical sector servo configuration on disk surface Servo frame format Actuator motor control Operation to move the head to the reference cylinderSeek operation Track following operationStart mode Acceleration modeStable rotation mode Spindle motor controlThis page is intentionally left blank Interface Interface signals Physical Interface5VDC/GND Comreset / CominitComwake Signal interface regulation Out of band signalingAlign ContEOF PmackRIP ROKRrdy SOFFER Electrical specificationsPhysical Layer Electrical Requirements 1/3 Physical Layer Electrical Requirements 2/3 Physical Layer Electrical Requirements 3/3 Connector pinouts Connector pinouts5 P11 function Staggered Spin-upDriving Ready LED Requirements for P11 as an output pinExample of the circuit for driving Ready LED Hot Plug Conceptual diagram of communication layers Logical InterfaceCommunication layers Physical layerLink layer Transport layerOutline of the Shadow Block Register Shadow Block RegisterOutline of the frame information structure FIS FIS typesRegister Host to Device Register Host to Device FIS layoutRegister Device to Host DMA Active Device to HostDMA Setup Device to Host or Host to Device Bidirectional TAGBist Active Bidirectional Bist combinationsData Host to Device or Device to Host Bidirectional Data FIS Bidirectional layoutError Field Shadow block registersUNC SfrrFeatures Field exp Sector Count Field expSector Number Field exp Cylinder Low Field expCylinder High Field exp Device/Head FieldHS3 HS2 HS1 HS0 HS3Bit Device Write Fault DF bit Bit Error ERR bitStatus field Bit 7 Busy BSY bitCommand Field Bit 2 Software Reset SrstDevice Control Field EStatus FieldCommand code and parameters 1/3 Host CommandsCommand code and parameters Command code and parameters 2/3 Command code and parameters 3/3 Command descriptions Error reporting conditions Recalibrate X’10’ to X’1F’Read 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’ Execute Device Diagnostic X’90’ Diagnostic codeInitialize Device Parameters X’91’ Download Microcode X’92’ Operation of Download MicrocodeError reporting conditions Standby Immediate X’94’ or X’E0’ Idle Immediate X’95’ or X’E1’ Standby X’96’ or X’E2’ Idle X’97’ or X’E3’ Host Commands Check Power Mode X’98’ or X’E5’ ’FF’Comreset Sleep X’99’ or X’E6’Smart X’B0’ 10 Features Field values subcommands and functions 1/3 10 Features Field values subcommands and functions 2/3 Smart Enable OperationsSmart Disable Operations Smart Read LOGSmart Return Status 10 Features Field values subcommands and functions 3/3’DB’ Smart ENABLE/DISABLE Auto OFF-LINE Key C2h Key 4Fh 1FF 12 Format of guarantee failure threshold value data11 Format of device attribute value data Data format version number Attribute IDStatus Flag Current attribute valueAttribute value for the worst case so far Raw attribute value14 Self-test execution status 13 Off-line data collection statusSelf-test execution status 16 Failure prediction capability flag 17 Drive error logging capability15 Off-line data collection capability Guarantee failure threshold Smart error loggingChecksum 18 Log Directory Data Format19 Data format of Smart Summary Error Log 1/2 19 Data format of Smart Summary Error Log 2/2 Command data structureError data structure Total number of drive errors20 Data format of Smart Comprehensive Error Log Smart Self-Test21 Smart self-test log data format 1FCSelf-test number Self-test indexCurrent LBA under test 22 Selective self-test log data structureTest Span Feature Flags 23 Selective self-test feature flagsCurrent Span under test Selective Self-test pending time minDevice Configuration XB1 Device Configuration RestoreDevice Configuration Freeze Device Configuration IdentifyDevice Configuration Restore Features Field = C0h Device Configuration Freeze Lock Features Field = C1hDevice Configuration Identify Features Field = C2h Device Configuration SET Features Field = C3h24 Device Configuration Identify data structure 1/2 Word Value Content24 Device Configuration Identify data structure 2/2 Read Multiple X’C4’ 10 Execution example of Read Multiple command LBA LSB Write Multiple X’C5’ At command issuance Shadow Block Registers setting contents SET Multiple Mode X’C6’ Interface Read DMA X’C8’ or X’C9’ LBA Write 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’ 25 Information to be read by Identify Device command 1/3 ’3FFF’25 Information to be read by Identify Device command 2/3 25 Information to be read by Identify Device command 3/3 MHV2100BH MHV2080BHHost Commands Word 59 Transfer sector count currently set by READ/WRITE Host Commands Interface Bit Interface Device always returns the fixed value indicated on the left Interface SET Features X’EF’ 26 Features field values and settable modes 1/226 Features field values and settable modes 2/2 Data Transfer Mode Advanced Power Management APM Serial ATA Functions Automatic Acoustic Management AAM27 Contents of Security SET Password data Error reporting conditions Security UNLOCKX’F2’ When the master password is selectedWhen the user password is selected Host Commands Security Erase Prepare X’F3’ Security Erase Unit X’F4’ Security Freeze Lock X’F5’ Error reporting conditions 29 Contents of security password Error reporting conditions Read Native MAX Address X’F8’ LbalsbSET MAX X’F9’ SET MAX AddressSET MAX SET Password Features Field = 01h Password information SET MAX Lock Features Field = 02h SET MAX Unlock Features Field = 03h SET MAX Freeze Lock Features Field = 04h Read Sector S EXT X’24’ Description Read DMA EXT X’25’ Description Read Native MAX Address EXT X’27’ Read Multiple EXT X’29’ Read LOG EXT X2F Sector offset 30 Data format of Read Log Ext log page 10h 31 Tag field information32 Data format of Read Log Ext log page 11h 33 Counter Identifier informationWrite 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-E224 137 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 Error posting 34 Command code and parameters 1/2Command Name Sfrw SfrrDWF 34 Command code and parameters 2/2TK0NF Command Protocol Non-data command protocolExecute Device Diagnostic Initialize Device Parameters DataHost PIO data-in command protocol PIO data-out command protocol 12 PIO data-in command protocol13 PIO data-out command protocol DMA data-in command protocol Read DMA EXT Identfy Device Identfy Device DMADMA data-out command protocol Write DMA EXT FUA EXTNative Command Queuing protocol Read FP DMA Queued Write FP DMA Queued16 Read FP DMA Queued command protocol 17 Write FP DMA Queued command protocol Power-on and Comreset 18 Power-on sequence19 Comreset sequence This page is intentionally left blank Operations Reset and Diagnosis Response to power-onReset and Diagnosis Response to Comreset Response to ComresetSoftware settings preservation Comreset preservation requirementsSET Address MAX EXT Response to a software reset Response to a software resetPower Save Power save modeActive mode Active idle modeStandby mode Sleep modePower commands Partial mode Power Save Controlled by Interface Power Management IPMPower save mode of the interface Slumber mode MB buffer Read-ahead CacheData buffer structure Data that is a target of caching Commands that are targets of cachingCaching operation Invalidating caching-target data Using the read segment buffer Miss-hitSequential hit Full hitHAP end location of the previous read command Partial hit Command that are targets of caching Write CacheCache operation Invalidation of cached dataStatus report in the event of an error Comreset and software reset responseCashing function when power supply is turned on Enabling and disablingThis page is intentionally left blank Glossary Power save mode Host receptacleMaster Device PIO Programmed input-outputRotational delay Seek timeSerial-ATA Slave DeviceThis page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank Index CachingIndex Example of model name and product Mean time between failure Mtbf Read Native MAX Address 4-3Status, off-line data collection Comment Form JapanThis page is intentionally left blank C141-E224-01EN This page is intentionally left blank