Stable rotation mode | Fujitsu MHT2040BH, MHT2060BH, MHT2080BH

4.7 Servo Control

(3) Stable rotation mode

The SVC calculates a time for one revolution of the spindle motor based on the PHASE signal. The MPU takes a difference between the current time and a time for one revolution at 4,200 rpm that the MPU already recognized. Then, the MPU keeps the rotational speed to 4,200 rpm by charging or discharging the charge pump for the different time. For example, when the actual rotational speed is 4,000 rpm, the time for one revolution is 15.000 ms. And the time for one revolution at 4,200 rpm is 14.286 ms. Therefore, the MPU charges the charge pump for 0.714 ms ⋅ k (k: constant value). This makes the flowed current into the motor higher and the rotational speed up. When the actual rotational speed is faster than 4,200 rpm, the MPU discharges the pump the other way. This control (charging/discharging) is performed every 1 revolution.

C141-E203-01EN

4-19

Image 73

Fujitsu MHT2040BH, MHT2060BH, MHT2080BH manual Stable rotation mode

Contents

Disk Drives Product Manual MHT2080BH, MHT2060BH, MHT2040BH Handling of This Manual For Safe Operation Revision History This page is intentionally left blank Overview of Manual Preface Operating Environment Conventions for Alert MessagesConventions Liability Exception This page is intentionally left blank Important Alert Messages Important Alert Items This page is intentionally left blank Manual Organization MHT2040BH Disk Drives Maintenance ManualMHT2040BH Disk Drives Product Manual This page is intentionally left blank Contents Theory of Device Operation Installation Conditions Interface 102 Operations Acronyms and Abbreviations AB-1 GL-1IN-1 Figures Illustrations Response to power-on when the host is powered Tables Recommended connector specifications for the host system Relationship between combination of Identifier and Security Device Overview Functions and performance FeaturesAdaptability Interface Specifications summary Device SpecificationsSpecifications 1/2 MHT2080BH MHT2060BH MHT2040BH Model and product number Specifications 2/2MHT2080BH Examples of model names and product numbers Input Voltage Power RequirementsRipple Current and power dissipation Current Requirements and Power Dissipation Current fluctuation Typ. at +5 V when power is turned on Environmental SpecificationsPower on/off sequence Environmental specifications Shock and vibration specification Acoustic noise specificationAcoustic Noise Shock and Vibration Data assurance in the event of power failure Service lifeReliability Mean time between failures Mtbf Unrecoverable read error Error RatePositioning error Media Defects Advanced Power Management Advanced power management Host-initiated Interface Power Management Hipm Interface Power Management IPMDevice-initiated Interface Power Management Dipm Interface power management This page is intentionally left blank Device Configuration Device Configuration Sata interface System ConfigurationDrive connection Read/write circuit This page is intentionally left blank Installation Conditions Dimensions Dimensions Integration Guidance C141-E144 MountingOrientation Limitation of mounting FramePCA Location of breather Ambient temperature Handling cautions Service area Sumitomo 3M ESDHios Connections with Host System Device connector Signal 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 Subassemblies OutlineDisk Spindle Air filter Circuit ConfigurationServo circuit Spindle motor driver circuit Power Supply Configuration PCA Power-on operation sequence Power-on Sequence Self-calibration Self-calibration contents Execution timing of self-calibration Command processing during self-calibration Read/write preamplifier PreAMP Read/write CircuitWrite circuit RLL code Meeprml AGC circuit Read circuitProgrammable filter circuit FIR circuit Digital PLL circuitD converter circuit Viterbi detection circuit Servo control circuit Servo ControlMicroprocessor unit MPU Servo burst capture circuit Power amplifierA converter DAC Spindle motor control circuit Inner guard band IGB Data-surface servo formatData area Outer guard band OGB Physical sector servo configuration on disk surface Servo frame format Operation to move the head to the reference cylinder Actuator motor controlSeek operation Track-following operation Acceleration mode Start modeSpindle motor control Stable rotation mode This page is intentionally left blank Interface Physical Interface Interface signals Comwake Comreset / Cominit5VDC/GND Out of band signaling Signal interface regulation Primitives descriptions Physical Layer Electrical Requirements 1/2 Electrical specifications Physical Layer Electrical Requirements 2/2 COMRESET/COminit Connector pinouts Connector pinouts Logical Interface Conceptual diagram of communication layers Physical layer Communication layersLink layer Transport layer Shadow Block Register Outline of the Shadow Block Register FIS types Outline of the frame information structure FISRegister Host to Device Register Host to Device FIS layout 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 FIS Bidirectional layout Data Host to Device or Device to Host Bidirectional Shadow block registers Error FieldUNC Sector Count Field exp Features Field expSector Number Field exp Cylinder Low Field exp Device/Head Field Cylinder High Field expHS3 HS2 HS1 HS0 HS3 Bit Error ERR bit Bit Device Write Fault DF bitStatus field Bit 7 Busy BSY bit Bit 2 Software Reset Srst Command FieldDevice Control Field EStatus Field Command 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 conditions Read Sectors X’20’ or X’21’ LBA LBA LSB Read Long X’22’ or X’23’ Write Sectors X’30’ or X’31’ 00 *1 Error information Write Long X’32’ or X’33’ Cylinder No. LSB 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’ Idle Immediate X’95’ or X’E1’ Standby X’96’ or X’E2’ Idle X’97’ or X’E3’ Host Commands ’FF’ 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 Enable Operations Features Field values subcommands and functions 2/3Smart Disable Operations Smart Read LOG ’DB’ Smart ENABLE/DISABLE Auto OFF-LINE Features Field values subcommands and functions 3/3Smart Return Status Key C2h 10 Format of device attribute value data 11 Format of guarantee failure threshold value data1FF Attribute ID Data format version number Current attribute value Status FlagAttribute value for the worst case so far Raw attribute value Self-test execution status 12 Off-line data collection status13 Self-test execution status 14 Off-line data collection capability 16 Drive error logging capability15 Failure prediction capability flag Smart error logging Guarantee failure thresholdChecksum 17 Log Directory Data Format 18 Data format of Smart Summary Error Log 1/2 Command data structure 18 Data format of Smart Summary Error Log 2/2Error data structure Total number of drive errors Smart Self-Test 19 Data format of Smart Comprehensive Error Log 1FC 20 Smart self-test log data formatSelf-test number Self-test index Test Span 21 Selective self-test log data structureCurrent LBA under test 22 Selective self-test feature flags Feature FlagsCurrent Span under test Selective Self-test pending time min Device Configuration Restore Device Configuration XB1Device Configuration Freeze Device Configuration Identify 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 Word Value Content 23 Device Configuration Identify data structure Read Multiple X’C4’ 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’ ’3FFF’ 24 Information to be read by Identify Device command 1/3 24 Information to be read by Identify Device command 2/3 24 Information to be read by Identify Device command 3/3 Interface Bit 0 Reserved C141-E203-01EN FIS Host Commands Word Bit Bit 0 1 = Supports the Mode C141-E203-01EN Interface 25 Features field values and settable modes 1/2 SET Features X’EF’ 25 Features field values and settable modes 2/2 Data Transfer Mode Advanced Power Management APM Automatic Acoustic Management AAM Serial ATA Functions 26 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 28 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 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 30 Tag field information 29 Data format of Read Log Ext log page 10h 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 132 C141-E203-01EN 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 31 Command code and parameters 1/2 Error postingCommand Name Sfrw Sfrr 31 Command code and parameters 2/2 Non-data command protocol Command ProtocolExecute Device Diagnostic Initialize Device Parameters Host PIO data-in command protocol Piosu Data PIO data-out command protocol Piosu 12 PIO data-out command protocol Read DMA EXT Identfy DMA DMA data-in command protocol Write DMA EXT FUA EXT DMA data-out command protocol Read FP DMA Queued Write FP DMA Queued Native Command Queuing protocol 15 Read FP DMA Queued command protocol 16 Write FP DMA Queued command protocol 17 Power-on sequence Power-on and Comreset 18 Comreset sequence Operations Response to power-on Reset and Diagnosis Reset and Diagnosis Response to Comreset Response to Comreset Response to a software reset Response to a software reset Power save mode Power SaveActive mode Active idle mode Sleep mode Standby mode Power commands Power save mode of the interface Interface Power SavePartial mode Slumber mode Data buffer structure Read-ahead Cache8MB buffer Caching operation Commands that are targets of cachingData that is a target of caching Invalidating caching-target data Miss-hit Using the read segment buffer Full hit Sequential hit HAP end location of the previous read command Partial hit Write Cache Command that are targets of cachingCache operation Invalidation of cached data Comreset and software reset response Status report in the event of an errorCashing function when power supply is turned on Enabling and disabling This page is intentionally left blank Glossary Rotational delay Power save modePIO Programmed input-output Positioning Acronyms and Abbreviations This page is intentionally left blank Index Block diagram Index Device-initiated interface power Frame information structure FIS Moving head to reference cylinder .4-13 RLL algorithm run length limited Read Native MAX Address Sensing and compensating for IN-8 C141-E203-01EN Disk Drives Product Manual Comment FormJapan This page is intentionally left blank C141-E203-01EN This page is intentionally left blank