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Fujitsu MHV2100BH, MHV2120BH, MHV2080BH, MHV2040BH, MHV2060BH Servo Control, Servo control circuit

Models: MHV2100BH MHV2040BH MHV2120BH 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 66

Fujitsu MHV2100BH, MHV2120BH, MHV2080BH, MHV2040BH, MHV2060BH manual Servo Control, Servo control circuit

Contents

MHV2120BH, MHV2100BH, MHV2080BH MHV2060BH, MHV2040BH Disk Drives Product Manual For Safe Operation Handling of This Manual Revision History This page is intentionally left blank Preface Overview of Manual Conventions for Alert Messages Operating EnvironmentConventions Liability Exception This page is intentionally left blank Important Alert Items Important Alert Messages This page is intentionally left blank Disk Drives Maintenance Manual Manual OrganizationDisk Drives Product Manual This page is intentionally left blank Contents Device Configuration Installation ConditionsTheory of Device Operation Contents Interface Xii C141-E224 104 Acronyms and Abbreviations AB-1 OperationsGL-1 IN-1 Illustrations Figures Response to power-on Tables Examples of model names and product numbers 133 Device Overview Features Functions and performanceAdaptability High resistance against shock Error correction and retry by ECCLow noise and vibration Connection to Sata interface Device Specifications Specifications summarySpecifications 1/2 Model and product number Examples of model names and product numbers Ripple Power RequirementsInput Voltage Slope of an input voltage at rise Negative voltage at +5 V when power is turned off Current Requirements and Power Dissipation Current and power dissipation Power on/off sequence Environmental SpecificationsCurrent fluctuation Typ. at +5 V when power is turned on Environmental specifications Acoustic Noise Acoustic noise specificationShock and vibration specification Shock and Vibration Service life Data assurance in the event of power failureMean time to repair Mttr Positioning error Error RateUnrecoverable read error Media Defects Advanced Power Management APM Recommended power-off sequence Advanced Power Management Interface Power Management IPM Host-initiated interface power management HipmDevice-initiated interface power management Dipm Interface power management Restriction of Use of Hazardous Substances Device Configuration Device Configuration Drive connection System ConfigurationSata interface Read/write circuit This page is intentionally left blank Installation Conditions Dimensions Dimensions Mounting Integration Guidance C141-E144Orientation Frame Limitation of mountingPCA Location of breather Ambient temperature Service area Handling cautions ESD Sumitomo 3MHios Device connector Connections with Host System Connector specifications for host system Signal segment and power supply segmentRecommended connector specifications for the host system Sata interface cable connection This page is intentionally left blank Theory of Device Operation Disk OutlineSubassemblies Spindle Servo circuit Circuit ConfigurationAir filter Spindle motor driver circuit Power supply configuration PCA Power-on Sequence Power-on operation sequence Self-calibration contents Self-calibration Command processing during self-calibration Execution timing of self-calibration Write circuit Read/write CircuitRead/write preamplifier PreAMP Write precompensation Read circuit AGC circuitProgrammable filter circuit D converter circuit Digital PLL circuitFIR circuit Viterbi detection circuit Servo Control Servo control circuit Servo burst capture circuit Power amplifierMicroprocessor unit MPU A converter DAC Driver circuit VCM current sense resistor CSR Data area Data-surface servo formatInner guard band Outer guard band Physical sector servo configuration on disk surface Servo frame format Seek operation Actuator motor controlOperation to move the head to the reference cylinder Track following operation Stable rotation mode Start modeAcceleration mode Spindle motor control This page is intentionally left blank Interface Interface signals Physical Interface Comreset / Cominit Comwake5VDC/GND Signal interface regulation Out of band signaling EOF AlignCont Pmack Rrdy RIPROK SOF Electrical specifications Physical Layer Electrical Requirements 1/3FER Physical Layer Electrical Requirements 2/3 Physical Layer Electrical Requirements 3/3 Connector pinouts Connector pinouts Driving Ready LED 5 P11 functionStaggered Spin-up Requirements for P11 as an output pin Example of the circuit for driving Ready LED Hot Plug Conceptual diagram of communication layers Logical Interface Link layer Communication layersPhysical layer Transport layer Outline of the Shadow Block Register Shadow Block Register Register Host to Device Outline of the frame information structure FISFIS types Register Host to Device FIS layout Register Device to Host DMA Active Device to Host DMA Setup Device to Host or Host to Device Bidirectional TAG Bist Active Bidirectional Bist combinations PIO Setup Device to Host Data Host to Device or Device to Host BidirectionalData FIS Bidirectional layout Interface Set Device Bits Device to Host 11 Set Device Bits FIS UNC Error FieldShadow block registers Sfrr Sector Number Field exp Features Field expSector Count Field exp Cylinder Low Field exp HS3 HS2 HS1 HS0 Cylinder High Field expDevice/Head Field HS3 Status field Bit Device Write Fault DF bitBit Error ERR bit Bit 7 Busy BSY bit Device Control Field Command FieldBit 2 Software Reset Srst EStatus Field Host Commands Command code and parametersCommand code and parameters 1/3 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 LBA Write 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 code Initialize Device Parameters X’91’ Download Microcode X’92’ Operation of Download Microcode 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 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 Smart Disable Operations 10 Features Field values subcommands and functions 2/3Smart Enable Operations Smart Read LOG 10 Features Field values subcommands and functions 3/3 ’DB’ Smart ENABLE/DISABLE Auto OFF-LINE’DA’ Smart Return Status Key C2h 12 Format of guarantee failure threshold value data 11 Format of device attribute value data1FF Data format version number Attribute ID Attribute value for the worst case so far Status FlagCurrent attribute value Raw attribute value 13 Off-line data collection status Self-test execution status14 Self-test execution status 17 Drive error logging capability 15 Off-line data collection capability16 Failure prediction capability flag Checksum Guarantee failure thresholdSmart error logging 18 Log Directory Data Format 19 Data format of Smart Summary Error Log 1/2 Error data structure 19 Data format of Smart Summary Error Log 2/2Command data structure Total number of drive errors 20 Data format of Smart Comprehensive Error Log Smart Self-Test Self-test number Self-test index 22 Selective self-test log data structure Test SpanCurrent LBA under test Current Span under test Feature Flags23 Selective self-test feature flags Selective Self-test pending time min Device Configuration Freeze Device Configuration XB1Device Configuration Restore Device Configuration Identify Device Configuration Restore Features Field = C0h Device Configuration Freeze Lock Features Field = C1h Device Configuration Identify Features Field = C2h Device Configuration SET Features Field = C3h 24 Device Configuration Identify data structure 1/2 Word Value Content 24 Device Configuration Identify data structure 2/2 Read Multiple X’C4’ 12 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’ Host Commands Read DMA X’C8’ or X’C9’ LBA Write DMA X’CA’ or X’CB’ Host Commands 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 MHV2120BH MHV2100BH MHV2080BH MHV2060BH MHV2040BH ’3FFF’ Interface Command without interrupt supports 2, 4, 8 and 16 sectors Interface Host Commands Interface Host Commands Device always returns the fixed value indicated on the left Host Commands SET Features X’EF’ 26 Features field values and settable modes 1/2 26 Features field values and settable modes 2/2 Data Transfer Mode Advanced Power Management APM Serial ATA Functions Automatic Acoustic Management AAM 27 Contents of Security SET Password data Error reporting conditions When the master password is selected When the user 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 29 Contents of security password Error reporting conditions Read Native MAX Address X’F8’ Lbalsb SET MAX X’F9’ SET MAX Address SET 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 information 32 Data format of Read Log Ext log page 11h 33 Counter Identifier information 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-E224 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 Command Name Error posting34 Command code and parameters 1/2 Sfrw Sfrr 34 Command code and parameters 2/2 TK0NFDWF Execute Device Diagnostic Initialize Device Parameters Command ProtocolNon-data command protocol Data Host PIO data-in command protocol PIO data-out command protocol 14 PIO data-in command protocol 15 PIO data-out command protocol DMA data-in command protocol Read DMA EXT Identfy Device Identfy Device DMA DMA data-out command protocol Write DMA EXT FUA EXT Native Command Queuing protocol Read FP DMA Queued Write FP DMA Queued 18 Read FP DMA Queued command protocol 19 Write FP DMA Queued command protocol Power-on and Comreset 20 Power-on sequence 21 Comreset sequence This page is intentionally left blank Operations Reset and Diagnosis Response to power-on Reset and Diagnosis Response to Comreset Response to Comreset Software settings preservation Comreset preservation requirements SET Address MAX EXT Response to a software reset Response to a software reset Active mode Power SavePower save mode Active idle mode Standby mode Sleep mode Power commands Power Save Controlled by Interface Power Management IPM Power save mode of the interfacePartial mode Slumber mode Read-ahead Cache Data buffer structureMB buffer Commands that are targets of caching Caching operationData that is a target of caching Invalidating caching-target data Using the read segment buffer Miss-hit Sequential hit Full hit HAP end location of the previous read command Partial hit Cache operation Command that are targets of cachingWrite Cache Invalidation of cached data Cashing function when power supply is turned on Status report in the event of an errorComreset and software reset response Enabling and disabling This page is intentionally left blank Glossary Master Device Power save modeHost receptacle PIO Programmed input-output Serial-ATA Rotational delaySeek time Slave Device This page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank Index Caching Index Example of model name and product Mean time between failure Mtbf Read Native MAX Address 4-3 Status, off-line data collection Comment Form Japan This page is intentionally left blank MHV2120BH, MHV2100BH, MHV2080BH, MHV2060BH, MHV2040BH C141-E224-02ENPage