Manuals / Fujitsu / Computer Equipment / Computer Drive

Fujitsu MHV2040BH, MHV2100BH, MHV2080BH, MHV2060BH manual Using the read segment buffer, Miss-hit

Models: MHV2100BH MHV2040BH MHV2060BH MHV2080BH

1 274

Download 274 pages 5.42 Kb

Page 250

Operations

6.4.3 Using the read segment buffer

Methods of using the read segment buffer are explained for following situations.

6.4.3.1 Miss-hit

In this situations, the top block of read requested data is not stored at all in the data buffer. As a result, all of the read requested data is read from disk media.

1)HAP (host address pointer) and DAP (disk address pointer) are defined in the head of the segment allocated from Buffer. (If pre-read is executed, HAP is set at the requested data reading position.)

HAP (host address pointer)

Read segment

DAP (disk address pointer)

2)During reading of read requested data, the request data that has already been read is sent to the host system.

HAP

Read requested data is stored until this point

Read requested data			Free space

DAP

3)When reading of read requested data is completed and transfer of the read requested data to the host system is completed, reading of the disk continues until a certain amount of data is stored.

HAP (stop)

Read requested data	Read-ahead data

DAP

4)The following cache valid data is for the read command that is executed next:

Cache valid data

LAST LBA START LBA

6-16

C141-E224

Image 250

Fujitsu MHV2040BH, MHV2100BH, MHV2080BH, MHV2060BH manual Using the read segment buffer, Miss-hit

Contents

MHV2100BH, MHV2080BH MHV2060BH, MHV2040BH Disk Drives Product ManualFor Safe Operation Handling of This ManualRevision History This page is intentionally left blank Preface Overview of ManualOperating Environment Conventions for Alert MessagesConventions Liability Exception This page is intentionally left blank Important Alert Items Important Alert MessagesThis 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 Contents Interface3.1 101 Power Save Controlled by Interface Power Management IPM OperationsGlossary GL-1 Acronyms and Abbreviations AB-1 Index IN-1 Illustrations FiguresResponse to power-on when the host is powered on Tables Examples of model names and product numbersRelationship between combination of Identifier This page is intentionally left blank Device Overview Functions and performance FeaturesAdaptability High resistance against shock Error correction and retry by ECCLow noise and vibration Connection to Sata interfaceSpecifications 1 Device SpecificationsSpecifications summary MHV2100BH MHV2080BH MHV2060BH MHV2040BHMHV2100BH Specifications 2Model and product number Examples of model names and product numbersInput Voltage Power RequirementsRipple Current Requirements and Power Dissipation Current and power dissipationPower on/off sequence Environmental SpecificationsCurrent fluctuation Typ. at +5 V when power is turned on Environmental specificationsAcoustic Noise Acoustic noise specificationShock and vibration specification Shock and VibrationReliability Service lifeData assurance in the event of power failure Mean time between failures MtbfPositioning error Error RateUnrecoverable read error Media DefectsAdvanced Power Management Recommended power-off sequenceAdvanced Power Management Host-initiated interface power management Hipm Interface Power Management IPMDevice-initiated interface power management Dipm Interface power management Elimination of Hazardous SubstancesThis page is intentionally left blank Device Configuration Device Configuration Drive connection System ConfigurationSata interface Read/write circuitThis page is intentionally left blank Installation Conditions Dimensions DimensionsIntegration Guidance C141-E144 MountingOrientation Limitation of mounting FramePCA Location of breather Ambient temperature Service area Handling cautionsSumitomo 3M ESDHios Device connector Connections with Host SystemSignal 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 Disk OutlineSubassemblies SpindleServo circuit Circuit ConfigurationAir filter Spindle motor driver circuitPower supply configuration PCA Power-on Sequence Power-on operation sequenceSelf-calibration contents Self-calibrationCommand processing during self-calibration Execution timing of self-calibrationWrite circuit Read/write CircuitRead/write preamplifier PreAMP Write precompensationAGC circuit Read circuitProgrammable filter circuit D converter circuit Digital PLL circuitFIR circuit Viterbi detection circuitServo Control Servo control circuitServo burst capture circuit Power amplifierMicroprocessor unit MPU A converter DACDriver circuit VCM current sense resistor CSRData area Data-surface servo formatInner guard band Outer guard bandPhysical sector servo configuration on disk surface Servo frame format Seek operation Actuator motor controlOperation to move the head to the reference cylinder Track following operationStable rotation mode Start modeAcceleration mode Spindle motor controlThis page is intentionally left blank Interface Interface signals Physical InterfaceComwake Comreset / Cominit5VDC/GND Signal interface regulation Out of band signalingEOF AlignCont PmackRrdy RIPROK SOFPhysical Layer Electrical Requirements 1/3 Electrical specificationsFER Physical Layer Electrical Requirements 2/3 Physical Layer Electrical Requirements 3/3 Connector pinouts Connector pinoutsDriving Ready LED 5 P11 functionStaggered Spin-up Requirements for P11 as an output pinExample of the circuit for driving Ready LED Hot Plug Conceptual diagram of communication layers Logical InterfaceLink layer Communication layersPhysical layer Transport layerOutline of the Shadow Block Register Shadow Block RegisterRegister Host to Device Outline of the frame information structure FISFIS types Register Host to Device FIS layoutRegister Device to Host DMA Active Device to HostDMA Setup Device to Host or Host to Device Bidirectional TAGBist Active Bidirectional Bist combinationsData Host to Device or Device to Host Bidirectional Data FIS Bidirectional layoutUNC Error FieldShadow block registers SfrrSector Number Field exp Features Field expSector Count Field exp Cylinder Low Field expHS3 HS2 HS1 HS0 Cylinder High Field expDevice/Head Field HS3Status field Bit Device Write Fault DF bitBit Error ERR bit Bit 7 Busy BSY bitDevice Control Field Command FieldBit 2 Software Reset Srst EStatus FieldCommand code and parameters Host CommandsCommand 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 LBAWrite 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 codeInitialize Device Parameters X’91’ Download Microcode X’92’ Operation of Download MicrocodeError 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 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’DB’ Smart ENABLE/DISABLE Auto OFF-LINE 10 Features Field values subcommands and functions 3/3Smart Return Status Key C2h Key 4Fh 11 Format of device attribute value data 12 Format of guarantee failure threshold value data1FF Data format version number Attribute IDAttribute value for the worst case so far Status FlagCurrent attribute value Raw attribute valueSelf-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 Checksum Guarantee failure thresholdSmart error logging 18 Log Directory Data Format19 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 errors20 Data format of Smart Comprehensive Error Log Smart Self-TestSelf-test number 21 Smart self-test log data format1FC Self-test indexTest Span 22 Selective self-test log data structureCurrent LBA under test Current Span under test Feature Flags23 Selective self-test feature flags Selective Self-test pending time minDevice Configuration Freeze Device Configuration XB1Device Configuration Restore Device Configuration IdentifyDevice Configuration Restore Features Field = C0h Device Configuration Freeze Lock Features Field = C1hDevice Configuration Identify Features Field = C2h Device Configuration SET Features Field = C3h24 Device Configuration Identify data structure 1/2 Word Value Content24 Device Configuration Identify data structure 2/2 Read Multiple X’C4’ 10 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’ Interface Read DMA X’C8’ or X’C9’ LBA 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’ 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 MHV2100BH MHV2080BHHost Commands Word 59 Transfer sector count currently set by READ/WRITE Host Commands Interface Bit Interface Device always returns the fixed value indicated on the left Interface SET Features X’EF’ 26 Features field values and settable modes 1/226 Features field values and settable modes 2/2 Data Transfer Mode Advanced Power Management APM Serial ATA Functions Automatic Acoustic Management AAM27 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 Read Native MAX Address X’F8’ LbalsbSET MAX X’F9’ SET MAX AddressSET 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 information32 Data format of Read Log Ext log page 11h 33 Counter Identifier informationWrite 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 137 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 SfrrTK0NF 34 Command code and parameters 2/2DWF Execute Device Diagnostic Initialize Device Parameters Command ProtocolNon-data command protocol DataHost PIO data-in command protocol PIO data-out command protocol 12 PIO data-in command protocol13 PIO data-out command protocol DMA data-in command protocol Read DMA EXT Identfy Device Identfy Device DMADMA data-out command protocol Write DMA EXT FUA EXTNative Command Queuing protocol Read FP DMA Queued Write FP DMA Queued16 Read FP DMA Queued command protocol 17 Write FP DMA Queued command protocol Power-on and Comreset 18 Power-on sequence19 Comreset sequence This page is intentionally left blank Operations Reset and Diagnosis Response to power-onReset and Diagnosis Response to Comreset Response to ComresetSoftware settings preservation Comreset preservation requirementsSET Address MAX EXT Response to a software reset Response to a software resetActive mode Power SavePower save mode Active idle modeStandby mode Sleep modePower 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 Using the read segment buffer Miss-hitSequential hit Full hitHAP end location of the previous read command Partial hit Cache operation Command that are targets of cachingWrite Cache Invalidation of cached dataCashing function when power supply is turned on Status report in the event of an errorComreset and software reset response Enabling and disablingThis page is intentionally left blank Glossary Master Device Power save modeHost receptacle PIO Programmed input-outputSerial-ATA Rotational delaySeek time Slave DeviceThis page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank Index CachingIndex Example of model name and product Mean time between failure Mtbf Read Native MAX Address 4-3Status, off-line data collection Comment Form JapanThis page is intentionally left blank C141-E224-01EN This page is intentionally left blank