Servo frame format | Fujitsu MHU2100AT specs

4.7 Servo Control

4.7.3 Servo frame format

As the servo information, the IDD uses the two-phase servo generated from the gray code and servo A to D. This servo information is used for positioning operation of radius direction and position detection of circumstance direction.

The servo frame consists of 6 blocks; write/read recovery, servo mark, gray code, servo A to D, and PAD. Figure 4.8 shows the servo frame format.

Figure 4.8 Servo frame format

(1) Write/read recovery

This area is used to absorb the write/read transient and to stabilize the AGC.

(2) Servo mark

This area generates a timing for demodulating the gray code and position- demodulating the servo A to D by detecting the servo mark.

(3) Gray code (including sector address bits)

This area is used as cylinder address. The data in this area is converted into the binary data by the gray code demodulation circuit

(4) Servo A, servo B, servo C, servo D

This area is used as position signals between tracks and the IDD control at on- track so that servo A level equals to servo B level.

(5) PAD

This area is used as a gap between servo and data.

C141-E202-01EN

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Fujitsu MHU2100AT manual Servo frame format

Contents

MHU2100AT Disk Drive Product Manual 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 MHU2100AT Disk Drive Maintenance ManualMHU2100AT Disk Drive Product Manual This page is intentionally left blank Contents Theory of Device Operation Installation Conditions Interface Contents 100 120 Operations Glossary GL-1 Acronyms and Abbreviations AB-1 Index IN-1 Figures Illustrations Execution example of Read Multiple command Tables Surface temperature measurement points and standard 25 Relationship between combination of Identifier This page is intentionally left blank Device Overview Functions and performance FeaturesAdaptability Connection to ATA interface Error correction and retry by ECCData buffer Read-ahead cache system Specifications summary Device SpecificationsSpecifications 1 Model and product number Specifications 2MHU2100AT Examples of model names and product numbers Input Voltage Power RequirementsRipple Current 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 Advanced Power Management This page is intentionally left blank Device Configuration Device Configuration ATA interface System Configuration2 1 drive connection Read/write circuit 3 2 drives connection 2 drives configuration Installation Conditions Dimensions Dimensions Integration Guidance C141-E144 MountingOrientation Limitation of mounting FramePCA Location of breather Ambient temperature Handling cautions Service area Handling cautions Cable Connections Device connector Cable connector specifications Cable connector specificationsDevice connection FCI Power supply connector CN1 Jumper SettingsLocation of setting jumpers Master drive-slave drive setting Factory default setting 14 Csel setting Csel setting 16 Example 2 of Cable Select Power Up in Standby setting 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 Control Microprocessor unit MPU Power amplifierServo burst capture circuit A converter DAC Driver circuit Spindle motor control circuitVCM current sense resistor CSR Inner guard band Data-surface servo formatData area Outer guard band 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 modeStable rotation mode Spindle motor control Theory of Device Operation Interface Physical Interface Interface signals Signal assignment on the interface connector Signal assignment on the connectorDA1 PDIAG-, Cblid DA0 DA2 Dasp GND Diow MstrStop Dior Cblid PdiagDasp Iordy Logical Interface I/O registers 1 I/O registersDA2 DA1 DA0 Error register X’1F1’ Command block registersData register X’1F0’ UNC Idnf SET Multiple Mode Features register X’1F1’Sector Count register X’1F2’ Cylinder Low register X’1F4’ Sector Number register X’1F3’Cylinder High register X’1F5’ DEV HS3 HS2 HS1 HS0 Device/Head register X’1F6’Status register X’1F7’ BSY Interface Control block registers Command register X’1F7’Alternate Status register X’3F6’ Command code and parameters Host CommandsDevice Control register X’3F6’ HOB Srst Command Name Command code and parameters 1Parameter Used EXT Flush Cache EXT Command code and parameters 2 Host Commands Command descriptions Host Commands Recalibrate X’10’ to X’1F’ MSB Read Sectors X’20’ or X’21’ End head No. / LBA MSB Read Long X’22’ or X’23’ Write Sectors X’30’ or X’31’ 1F7 HST Status information 1F6 HDH Write Long X’32’ or X’33’ Write Verify X’3C’ Read Verify Sectors X’40’ or X’41’ Seek X’70’ to X’7F’ Diagnostic code Execute Device Diagnostic X’90’ Host Commands Initialize Device Parameters X’91’ Download Micro Code X’92’ Operation of Download Micro Code 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’ Smart X’B0 Features Register values subcommands and functions 1 Smart Enable Operations Features Register values subcommands and functions 2Smart Disable Operations Smart Read LOG Smart ENABLE/DISABLE Auto OFF-LINE Features Register values subcommands and functions 3’DA’ Smart Return Status Interface 1FF Format of device attribute value dataFormat of insurance failure threshold value data 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 10 Off-line data collection status11 Self-test execution status 12 Off-line data collection capability Off-line data collection capabilityFailure prediction capability flag 13 Failure prediction capability flag 14 Error logging capability Error logging capabilityCheck sum Insurance failure threshold Smart error logging 16 Data format of Smart Summary Error Log Error data structure Command data structureTotal number of drive errors 17 Data format of Smart Comprehensive Error Log 18 Smart self-test log data format Smart Self-Test1FC Self-test number Test Span 19 Selective self-test log data structureCurrent LBA under test Current Span under test 20 Selective self-test feature flags Feature FlagsSelective Self-test pending time min Device Configuration Restore Device Configuration XB1Device Configuration Freeze Device Configuration Identify Device Configuration Freeze Lock FR = C1h Device Configuration Restore FR = C0hDevice Configuration Identify FR = C2h Device Configuration SET FR = C3h Host Commands 21 Device Configuration Identify data structure Read Multiple X’C4’ Execution example of Read Multiple command MSB Write Multiple X’C5’ Interface SET Multiple Mode X’C6’ Interface Read DMA X’C8’ or X’C9’ End head No. / LBA MSB 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’ ’3FFF’ 22 Information to be read by Identify Device command 1 22 Information to be read by Identify Device command 2 Word Command without interrupt supports 2, 4, 8 and 16 sectors = Supports the Host Protected Area feature set = Supports the CFA Compact Flash Association feature set Interface Host Commands Diagnosis Word Bit Reserved Security level High, 1 Maximum 23 Features register values and settable modes SET Features X’EF’’AA’ ’BB’ Data Transfer Mode Advanced Power Management APM Automatic Acoustic Management AAM 24 Contents of Security SET Password data At command issuance I-O register contents 1F7 hCM 1F6 hDH 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’ At command issuance I-O register contents 1F7 hCM 1F6 hDH 26 Contents of security password Host Commands Read Native MAX Address X’F8’ SET MAX Address SET MAX X’F9’ SET MAX SET Password FR = 01h SET MAX Lock FR = 02h SET MAX Unlock FR = 03h SET MAX Freeze Lock FR = 04h Interface Read Sectors EXT X’24’ Option customizing Description Read DMA EXT X’25’ Option customizing Description HOB=0 Error reporting conditionsHOB=1 Read Multiple EXT X’29’ Option customizing Description Read LOG EXT X2F Optional command Customize Description Interface Write Sectors EXT X’34’ Option customizing Description Write DMA EXT X’35’ Option customizing Description SET MAX Address EXT X’37’ Option customizing Description SET MAX LBA Write Multiple EXT X’39’ Option customizing Description Write LOG EXT X’3F’ Optional command Customize Description Host Commands Read Verify Sectors EXT X’42 Option customizing Description Flush Cache EXT X’EA’ Option customizing Description 27 Command code and parameters 1 Error posting 27 Command code and parameters 2 PIO Data transferring commands from device to host Command ProtocolExecute Device Diagnostic Initialize Device Parameters Read Sectors Command protocol Protocol for command abort PIO Data transferring commands from host to device Write Sectors command protocol Commands without data transfer DMA data transfer commands Other commandsRead Multiple EXT Write Multiple EXT Sleep Read DMA EXT Write DMA EXT Indentify Device DMA Normal DMA data transfer Overview Ultra DMA Feature Set Ultra DMA data in commands Phases of operationInitiating an Ultra DMA data in burst Data in transfer Pausing an Ultra DMA data in burst Terminating an Ultra DMA data in burst Interface Ultra DMA Feature Set Initiating an Ultra DMA data out burst Ultra DMA data out commands Data out transfer Pausing an Ultra DMA data out burst Terminating an Ultra DMA data out burst Ultra DMA Feature Set Ultra DMA CRC rules 28 Recommended series termination for Ultra DMA Series termination required for Ultra DMADIOR-HDMARDY-HSTROBE DIOW-STOP PIO data transfer TimingPIO data transfer timing Multiword data transfer 10 Multiword DMA data transfer timing mode 11 Initiating an Ultra DMA data in burst Ultra DMA data transfer Strobe Name Mode Comment MIN MAX 29 Ultra DMA data burst timing requirements 2 30 Ultra DMA sender and recipient timing requirements Mode Name Comment Dstrobe at device Sustained Ultra DMA data in burstDD150 at device Dstrobe at host DD150 at host Dmarq Host pausing an Ultra DMA data in burstDmack Stop Device terminating an Ultra DMA data in burst Host Host terminating an Ultra DMA data in burstDA0, DA1, DA2 CS0, CS1 16 Initiating an Ultra DMA data out burst Hstrobe at host DD150 at host Sustained Ultra DMA data out burstHstrobe at device DD150 at device Device DMACK- host Stop host DDMARDY- device Device pausing an Ultra DMA data out burstHstrobe host DD150 Host 19 Host terminating an Ultra DMA data out burst Host terminating an Ultra DMA data out burst Dmarq device DMACK- host Device terminating an Ultra DMA data out burstDD150 Host Master and slave devices are present 2-drives configuration Power-on and resetOnly master device is present This page is intentionally left blank Operations Response to power-on Device Response to the Reset Response to power-on Response to hardware reset Response to hardware reset Response to software reset Response to software reset Response to diagnostic command Response to diagnostic command Power save mode Power SaveActive mode Active idle mode Sleep mode Standby mode Defect Processing Power commandsSpare area Sector slip processing Alternating processing for defective sectorsTrack slip processing Automatic alternating processing Automatic alternating processing Data buffer structure Read-ahead Cache8MB buffer 8,388,608 bytes Read Sectors EXT Read Multiple EXT Read DMA EXT Caching operation Commands that are targets of cachingRead Multiple EXT Read Dmaext Data that is a target of caching Operations Miss-hit Using the read segment buffer Sequential Hit Full hit Partial hit Write Cache Command that are targets of cachingCache operation Invalidation of cached data Reset response Status report in the event of an errorCashing function when power supply is turned on Enabling and disabling Write Cache This page is intentionally left blank Glossary Rotational delay Power save modePIO Programmed input-output Positioning VCM Status This page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank AAM Index Index Information to be read by Identify Read Native MAX Address Read Sectors Command Surface temperature measurement This page is intentionally left blank Japan Comment Form This page is intentionally left blank C141-E202-01EN This page is intentionally left blank