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Fujitsu MHV2080BH manual Microprocessor unit MPU, Servo burst capture circuit, A converter DAC

Models: MHV2100BH MHV2040BH MHV2120BH MHV2060BH MHV2080BH

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4.7 Servo Control

(1) Microprocessor unit (MPU)

The MPU executes startup of the spindle motor, movement to the reference cylinder, seek to the specified cylinder, and calibration operations.

The main internal operations of the MPU are shown below.

a.Spindle motor start

Starts the spindle motor and accelerates it to normal speed when power is applied.

b.Move head to reference cylinder

Drives the VCM to position the head at the any cylinder in the data area. The logical initial cylinder is at the outermost circumference (cylinder 0).

c.Seek to specified cylinder

Drives the VCM to position the head to the specified cylinder.

d.Calibration

Senses and stores the thermal offset between heads and the mechanical forces on the actuator, and stores the calibration value.

(2) Servo burst capture circuit

The servo burst capture circuit reproduces signals (position signals) that indicate the head position from the servo data on the data surface. From the servo area on the data area surface, via the data head, the burst signals of EVEN1, ODD, EVEN2 are output as shown in Figure 4.8 in subsequent to the servo mark, gray code that indicates the cylinder position, and index information. The servo signals do A/D-convert by Fourier-demodulator in the servo burst capture circuit. At that time the AGC circuit is in hold mode. The A/D converted data is recognized by the MPU as position information.

(3) D/A converter (DAC)

The control program calculates the specified data value (digital value) of the VCM drive current, and the value is converted from digital-to-analog so that an analog output voltage is sent to the power amplifier.

(4) Power amplifier

The power amplifier feeds currents, corresponding to the DAC output signal voltage to the VCM.

(5) Spindle motor control circuit

The spindle motor control circuit controls the sensor-less spindle motor. A spindle driver IC with a built-in PLL(FLL) circuit that is on a hardware unit controls the sensor-less spindle motor.

C141-E224

4-13

Image 67

Fujitsu MHV2080BH, MHV2120BH manual Microprocessor unit MPU, Servo burst capture circuit, A converter DAC, Power amplifier

Contents

Disk Drives Product Manual MHV2120BH, MHV2100BH, MHV2080BH MHV2060BH, MHV2040BH 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 Disk Drives Maintenance ManualDisk Drives Product Manual This page is intentionally left blank Contents Installation Conditions Device ConfigurationTheory of Device Operation Interface Contents Xii C141-E224 104 IN-1 OperationsGL-1 Acronyms and Abbreviations AB-1 Figures Illustrations Response to power-on Examples of model names and product numbers Tables 133 Device Overview Functions and performance FeaturesAdaptability Connection to Sata interface Error correction and retry by ECCLow noise and vibration High resistance against shock Specifications summary Device SpecificationsSpecifications 1/2 Examples of model names and product numbers Model and product number Slope of an input voltage at rise Power RequirementsInput Voltage Ripple Negative voltage at +5 V when power is turned off Current and power dissipation Current Requirements and Power Dissipation Environmental specifications Environmental SpecificationsCurrent fluctuation Typ. at +5 V when power is turned on Power on/off sequence Shock and Vibration Acoustic noise specificationShock and vibration specification Acoustic Noise Data assurance in the event of power failure Service lifeMean time to repair Mttr Media Defects Error RateUnrecoverable read error Positioning error Recommended power-off sequence Advanced Power Management APM Advanced Power Management Host-initiated interface power management Hipm Interface Power Management IPMDevice-initiated interface power management Dipm Restriction of Use of Hazardous Substances Interface power management Device Configuration Device Configuration Read/write circuit System ConfigurationSata interface Drive connection 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 Spindle OutlineSubassemblies Disk Spindle motor driver circuit Circuit ConfigurationAir filter Servo 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 Write precompensation Read/write CircuitRead/write preamplifier PreAMP Write circuit AGC circuit Read circuitProgrammable filter 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 VCM current sense resistor CSR Driver circuit Outer guard band Data-surface servo formatInner guard band Data area 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 Comwake Comreset / Cominit5VDC/GND Out of band signaling Signal interface regulation Pmack AlignCont EOF SOF RIPROK Rrdy Physical Layer Electrical Requirements 1/3 Electrical specificationsFER Physical Layer Electrical Requirements 2/3 Physical Layer Electrical Requirements 3/3 Connector pinouts Connector pinouts Requirements for P11 as an output pin 5 P11 functionStaggered Spin-up Driving Ready LED Example of the circuit for driving Ready LED 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 Register Host to Device FIS layout Outline of the frame information structure FISFIS types 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 HostData FIS Bidirectional layout 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 HS3 Cylinder High Field expDevice/Head Field HS3 HS2 HS1 HS0 Bit 7 Busy BSY bit Bit Device Write Fault DF bitBit Error ERR bit Status field EStatus Field Command FieldBit 2 Software Reset Srst Device Control 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 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’ 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’ Comreset Smart X’B0’ 10 Features Field values subcommands and functions 1/3 Smart Read LOG 10 Features Field values subcommands and functions 2/3Smart Enable Operations Smart Disable Operations ’DB’ Smart ENABLE/DISABLE Auto OFF-LINE 10 Features Field values subcommands and functions 3/3’DA’ Smart Return Status Key C2h 11 Format of device attribute value data 12 Format of guarantee failure threshold value data1FF Attribute ID Data format version number Raw attribute value Status FlagCurrent attribute value Attribute value for the worst case so far Self-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 Checksum 19 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 structure Smart Self-Test 20 Data format of Smart Comprehensive Error Log Self-test index Self-test number Test 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 test Device Configuration Identify Device Configuration XB1Device 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 Word Value Content 24 Device Configuration Identify data structure 1/2 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’ ’3FFF’ 25 Information to be read by Identify Device command 1/3 25 Information to be read by Identify Device command 2/3 MHV2120BH MHV2100BH MHV2080BH MHV2060BH MHV2040BH ’3FFF’ 25 Information to be read by Identify Device command 3/3 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 26 Features field values and settable modes 1/2 SET Features X’EF’ 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 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 29 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’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 31 Tag field information 30 Data format of Read Log Ext log page 10h 33 Counter Identifier information 32 Data format of Read Log Ext log page 11h 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 Sfrw Sfrr Error posting34 Command code and parameters 1/2 Command Name TK0NF 34 Command code and parameters 2/2DWF Data Command ProtocolNon-data command protocol Execute Device Diagnostic Initialize Device Parameters 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 Identfy Device 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 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 Power save mode of the interface Power Save Controlled by Interface Power Management IPMPartial mode Slumber mode Data buffer structure Read-ahead CacheMB 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 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 Glossary PIO Programmed input-output Power save modeHost receptacle Master Device Slave Device Rotational delaySeek time Serial-ATA This page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank Caching Index Index Example of model name and product Mean time between failure Mtbf 4-3 Read Native MAX Address Status, off-line data collection Japan Comment Form This page is intentionally left blank C141-E224-02EN MHV2120BH, MHV2100BH, MHV2080BH, MHV2060BH, MHV2040BHPage