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Fujitsu MHY2040BH, MHY2160BH, MHY2200BH, MHY2250BH, MHY2100BH Servo Control, Servo control circuit

Models: MHY2120BH MHY2200BH MHY2100BH MHY2160BH MHY2040BH MHY2060BH MHY2080BH MHY2250BH

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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-E262

4-13

Image 71

Fujitsu MHY2040BH, MHY2160BH, MHY2200BH, MHY2250BH, MHY2100BH, MHY2120BH, MHY2080BH manual Servo Control, Servo control circuit

Contents

Disk Drives PRODUCT/MAINTENANCE Manual Handling of This Manual For Safe Operation Revision History This page is intentionally left blank Acronyms and Abbreviations Conventions for Alert MessagesOperating Environment Overview of Manual Preface Liability Exception Conventions Hot Plug Static, Damage Important Alert ItemsImportant Alert Messages Damage or Device damage Device damageData corruption Manual Organization Disk Drives PRODUCT/MAINTENANCE Manual This page is intentionally left blank Contents Theory of Device Operation Installation Conditions Interface Contents 100 Operations Maintenance and Diagnosis Glossary GL-1 Acronyms and Abbreviations AB-1 Index IN-1 Figures Illustrations Response to power-on when the device is powered on Tables Surface temperature measurement points and standard values 105 This page is intentionally left blank Device Overview Adaptability FeaturesFunctions and performance High resistance against shock Wide temperature rangeError correction and retry by ECC Low noise and vibration Self-diagnosis Device SpecificationsSpecifications summary Specifications 1/2 Model and product number Specifications 2/2 Examples of model names and product numbers Slope of an input voltage at rise Power RequirementsInput Voltage Ripple Permissible level − 0.2 Current and power dissipation Current Requirements and Power Dissipation Environmental specifications Environmental SpecificationsCurrent fluctuation Typ. at +5 V when power is turned on Shock and Vibration Acoustic noise specificationShock and vibration specification Acoustic Noise Mean time between failures Mtbf Service lifeData assurance in the event of power failure Reliability Media Defects Error RateUnrecoverable read error Positioning error Recommended power-off sequence Advanced Power Management APM Advanced Power Management Device-initiated interface power management Dipm Interface Power Management IPMHost-initiated interface power management Hipm Interface power management This page is intentionally left blank Device Configuration Spindle motor Device ConfigurationDisk Head Drive connection System ConfigurationSata interface This page is intentionally left blank Installation Conditions Dimensions Dimensions Frame MountingIntegration Guidance C141-E144 Orientation PCA Limitation of mounting Location of breather Ambient temperature Handling cautions Service area Hios ESDSumitomo 3M Connections with Host System Device connector Connector specifications for host system Signal segment and power supply segment Sata interface cable connection This page is intentionally left blank Theory of Device Operation Spindle OutlineSubassemblies Disk Spindle motor driver circuit Circuit ConfigurationAir filter Servo circuit Power supply configuration PCA Power-on Sequence Power-onStart Self-calibration Self-calibration contents Execution timing of self-calibration Command processing during self-calibration Write precompensation Read/write CircuitRead/write preamplifier PreAMP Write circuit Programmable filter circuit Read circuitAGC circuit Viterbi detection circuit Digital PLL circuitFIR circuit D converter circuit Servo control circuit Servo Control A converter DAC Power amplifierMicroprocessor unit MPU Servo burst capture circuit Data-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 operation Spindle motor control Start modeAcceleration mode Stable rotation mode This page is intentionally left blank Interface Physical Interface Interface signals 5VDC/GND Comreset / CominitComwake Out of band signaling Signal interface regulation Primitives descriptions Electrical specifications Connector pinouts Connector pinouts Driving Activity LED 5 P11 functionStaggered Spin-up Example of the circuit for driving Activity LED Requirements for P11 as an output pin Hot Plug Logical Interface Conceptual diagram of communication layers Transport layer Communication layersPhysical layer Link layer Shadow Block Register Outline of the Shadow Block Register FIS types Outline of the frame information structure FIS Register Host to Device FIS layout Register Host to Device DMA Active Device to Host Register Device to Host TAG DMA Setup Device to Host or Host to Device Bidirectional Bist combinations Bist Active Bidirectional Data Host to Device or Device to Host Bidirectional PIO Setup Device to Host Interface 11 Set Device Bits FIS Set Device Bits Device to Host Sfrr Error FieldShadow block registers UNC Cylinder Low Field exp Features Field expSector Count Field exp Sector Number Field exp HS2 HS1 HS0 Cylinder High Field expDevice/Head Field HS3 DSC DRQ ERR Status fieldBSY EStatus Field Command FieldBit 2 Software Reset Srst Device Control Field Command code and parameters 1/3 Host CommandsCommand code and parameters Command code and parameters 2/3 Command code and parameters 3/3 Command descriptions Recalibrate X 10 to X 1F Error reporting conditions Read Sectors X 20 or X LBA LBA LSB Write Sectors X 30 or X 00 *1 Error information Write Verify X 3C Host Commands Read Verify Sectors X 40 or X Host Commands Seek X 70 to X 7F Diagnostic code Execute Device Diagnostic X Initialize Device Parameters X Download Microcode X Operation of Download Microcode Microcode Standby Immediate X 94 or X E0 Host Commands Unload Feature Unload Immediate Command Standby X 96 or X E2 Idle X 97 or X E3 Host Commands Check Power Mode X 98 or X E5 Sleep X 99 or X E6 Comreset Smart X B0 Features Field values subcommands and functions 1/3 Smart Write LOG Features Field values subcommands and functions 2/3Smart Enable Operations Smart Read LOG Smart Return Status Features Field values subcommands and functions 3/3Smart Disable Operations Smart ENABLE/DISABLE Auto OFF-LINE Key C2h Key 4Fh 1FF 11 Format of guarantee failure threshold value data10 Format of device attribute value data Attribute ID Data format version number Raw attribute value Status FlagCurrent attribute value Attribute value for the worst case so far 13 Self-test execution status 12 Off-line data collection statusSelf-test execution status 15 Failure prediction capability flag Off-line data collection capability14 Off-line data collection capability Failure prediction capability flag Checksum Error logging capability16 Drive error logging capability Guarantee failure threshold 18 Data format of Smart Summary Error Log 1/2 Smart error logging Total number of drive errors 18 Data format of Smart Summary Error Log 2/2Command data structure Error data structure Smart Self-Test 19 Data format of Smart Comprehensive Error LogStatus Self-test index 20 Smart self-test log data format1FC Self-test number Current LBA under test 21 Selective self-test log data structureTest Span Current Span under test Feature Flags22 Selective self-test feature flags Smart Command Transport SCT SCT Read Data 23 SCT command and the functionSCT Command SET SCT Status Request SCT Status Request SN = E0h, FR = D5h SET MAX EXT, DCO 24 Format of SCT Status Response 1/2 24 Format of SCT Status Response 2/2 25 SCT Status code SCT Command SET SN = E0h, FR = D6 27 Write Same 1/2 26 Action code 27 Write Same 2/2 28 Error Recovery Control 29 Feature Control Command 30 SCT Data Table 31 had Temperature SCT Read Data SN = E1h, FR = D5h SCT Write Data SN = E1h, FR = D6h Device Configuration Identify Device Configuration X B1Device Configuration Restore Device Configuration Freeze Device Configuration Freeze Lock Features Field = C1h Device Configuration Restore Features Field = C0h Device Configuration SET Features Field = C3h Device Configuration Identify Features Field = C2h 32 Device Configuration Identify data structure 1/2 32 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 33 Information to be read by Identify Device command 1/3 33 Information to be read by Identify Device command 2/3 33 Information to be read by Identify Device command 3/3 MHY2100BH MHY2080BH MHY2060BH MHY2040BH MHY2250BH MHY2200BH MHY2160BH MHY2120BHFffffff Command without interrupt supports 1, 2, 4, 8 and 16 sectors Word 63 Multiword DMA transfer mode C141-E262 111 Interface C141-E262 113 Bits 13-0 Same definition as Word Undefined = Read and Write DMA EXT GPL optional commands are Host Commands Download 34 Features field values and settable modes 1/2 SET Features X EF 34 Features field values and settable modes 2/2 Error reporting conditions Data Transfer Mode Advanced Power Management APM Serial ATA Functions Automatic Acoustic Management AAM Write-Read-Verify feature optional 35 Contents of Security SET Password data Error reporting conditions Security Unlock X 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 37 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 SET MAX Lock Features Field = 02h SET MAX Unlock Features Field = 03h SET MAX Freeze Lock Features Field = 04h Read Sector S EXT X Description Read DMA EXT X Description Read Native MAX Address EXT X Read Multiple EXT X Read LOG EXT X 2F Sector offset 39 Tag field information 38 Data format of Read Log Ext log page 10h 41 Counter Identifier information 40 Data format of Read Log Ext log page 11h FR EXP SCT Status Request SN = E0hSC EXP SCT Read Data SN = E1h, FR = D5 Write Sector S EXT X Description Write DMA EXT X Description SET MAX Address EXT X SET MAX LBA Write Multiple EXT X Write DMA FUA EXT X 3D Write LOG EXT X 3F Error information 160 C141-E262 SCT Command SET SN = E0h SCT Write Data SN = E1h Read Verify Sector S EXT X Write Uncorrectable EXT X 42 Operation mode Read LOG DMA EXT X Description Write LOG DMA EX X Description Read FP DMA Queued X Description Write FP DMA Queued X Write Multiple FUA EXT X CE Flush Cache EXT X EA Sfrw Sfrr Error posting43 Command code and parameters 1/2 Command Name DWF 43 Command code and parameters 2/2 Data Command ProtocolExecute Device Diagnostic Initialize Device Parameters Non-data command protocol Host PIO data-in command protocol 14 PIO data-in command protocol PIO data-out command protocol 15 PIO data-out command protocol Read DMA EXT Identfy Device DMA Read LOG DMA EXT DMA data-in command protocol Write DMA EXT FUA EXT Write LOG DMA EXT DMA data-out command protocol Read FP DMA Queued Write FP DMA Queued Native Command Queuing protocol 18 Read FP DMA Queued command protocol 19 Write FP DMA Queued command protocol 20 Power-on sequence Power-on and Comreset 21 Comreset sequence This page is intentionally left blank Operations Response to power-on Reset and Diagnosis Reset and Diagnosis Response to Comreset Response to Comreset Comreset preservation requirements Software settings preservation SET Address MAX EXT Response to a software reset Response to a software reset Active idle mode Power SavePower save mode Active mode Sleep mode Standby mode Power commands Partial mode Power Save Controlled by Interface Power Management IPMPower save mode of the interface Slumber mode Read Sector S EXT Read-ahead CacheData buffer structure Example of 8 MB buffer Data that is a target of caching Commands that are targets of cachingCaching operation Invalidating caching-target data Miss-hit Using the read segment buffer Sequential hit Full hit Partial hit Invalidation of cached data Command that are targets of cachingWrite Cache Cache operation Enabling and disabling Status report in the event of an errorComreset and software reset response Cashing function when power supply is turned on This page is intentionally left blank Maintenance and Diagnosis Rules for maintenance Maintenance Maintenance requirements Data corruption Maintenance levels Disk drive revision number label Disk drive revision number Display of disk drive revision number Test Self-diagnosticsTools and test equipment Test flowchart Disposition for Error Field contents Status Field contents Operation test Diagnostic testOperation Confirmation Troubleshooting disk drive replaced in field Troubleshooting ProcedureTroubleshooting procedure VDC System level and field troubleshooting Troubleshooting at factory Spare Disk Drive Disk Drive Removal Procedure This page is intentionally left blank Glossary PIO Programmed input-output Power save modeRotational delay Master Device Status Serial-ATASlave Device This page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank Caching Index Index Example of model name and product Mode Read Native MAX Address Read/write circuit block diagram Shadow block register, outline Japan Comment Form This page is intentionally left blank C141-E262-01EN Page