Samsung M8 manual Read/Write IC, Power Management, Time Base Generator, Automatic Gain Control

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5.2.2.6Power Management

Power management features are incorporated into each block of the Spinpoint M8. This allows the designer to tailor the amount of power management to the specified design. Other power management features include:

Independent power management control for each block.

DSP block powered down and up when needed.

Disk Sequencer and associated disk logic powered up when the Disk Sequencer is started.

Weak pull-up structure on input pins to prevent undesirable power consumption due to floating CMOS inputs.

5.2.3Read/Write IC

The Read/Write IC, shown in Figure 5-3 provides read/write-processing functions for the drive. The Read/Write IC receives the Read GATE and Write GATE signals, write data, and servo AGC and gates from the Interface Controller. The Read/Write IC sends decoded read data and the read reference clock. It receives write data from the Interface Controller.

The 88C9310 which is embedded in 88i9322 is a sampled-data digital PRML channel designed to work with a disk controller and a read/write preamplifier to provide the signal processing elements required to build a state of the art high density, high speed disk drive.The 88C9310 implements a noise predictive, PRML Viterbi read channel (supporting) zone-bit recording,

The read/write channel functions include a time base generator, AGC circuitry, asymmetry correction circuitry (ASC), analog anti-aliasing low-pass filter, analog to digital converter (ADC), digital FIR filter, timing recovery circuits, Viterbi detector, sync mark detection, Iterative code ENDEC, serializer and de-serializer, and write pre- compensation circuits. Servo functions include servo data detection and PES demodulation. Additionally the 88C9310 contains specialized circuitry to perform various parametric measurements on the processed read signal. This allows for implementation of self-tuning and optimization capability in every drive built using the 88C9310.

A 12-bit NRZ interface is provided to support high speed data transfers and from the controller. Programming of the 88C9310 is performed through a serial interface. The serial interface is also used to read various channel parameters that are computed on the fly.

5.2.3.1Time Base Generator

The time base generator provides the write frequency and serves as a reference clock to the synchronizer during non-read mode.

5.2.3.2Automatic Gain Control

The AGC accepts a differential signal from the pre-amp, and provide constant output amplitude to the analog filter. It’s capable of accepting signal ranges from 50 mV to 400mVppd.

5.2.3.3Asymmetry Correction Circuitry (ASC)

The ASC circuit is designed to correct for amplitude asymmetry introduced by MR heads. The compensation range of this circuit is +/-25%. This circuit allows optimal bias current to be used independent of the asymmetry effect.

Spinpoint M8 Product Manual REV 2.3

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Contents M8 Product Manual Page Table of Contents Servo System Read and Write Operations Read Fpdma Queued 60h Read Log Extended 2Fh Read Long 22h Table of Tables Scope User DefinitionManual Organization Sata ReferenceDescription IntroductionKey Features Standards and Regulations Hardware RequirementsSpecifications Specification SummarySpecifications Spindle speed RPM RPM ClassPhysical Specifications Logical ConfigurationsPhysical Specifications Physical dimensionsPerformance Specifications Power consumption Power consumptionPower Requirements RatedEnvironmental Specifications Environmental Specifications15.0 Reliability Specifications Installation Space RequirementsUnpacking Instructions MountingMounting Dimensions OrientationClearance Mounting-Screw ClearanceCable Connectors VentilationSata Connectivity Serial ATA Power ManagementHDD Power, Sata Interface, and Factory Jumper Connector Pin Locations on the Drive Pcba Drive Installation DC Power Connector and SATA-Bus Interface Cable ConnectionsHead / Disk Assembly HDA Base Casting AssemblyDC Spindle Motor Assembly Disk Drive OperationCoverAssembly Disk Stack Assembly Head Stack AssemblyVoice Coil Motor and Actuator Latch Assemblies Air Filtration SystemDigital Signal Process and Interface Controller Drive ElectronicsDisk Controller DDR Host Interface Control Block Buffer Control BlockDisk Control Block Disk Ldpc Control BlockFrequency Synthesizer Power Management Read/Write ICTime Base Generator Automatic Gain ControlAnalog Anti-Aliasing Low Pass Filter Analog to Digital Converter ADC and FIRServo System Read and Write OperationsRead Channel Firmware Features Write ChannelRead Caching Write Caching Defect Management Automatic Defect AllocationMulti-burst ECC Correction SmartSata II Interface Sata TerminologySpinpoint M8 Product Manual REV Physical Interface Signal Summary Signal DescriptionsWhen read When written 2 I/O Register AddressControl Block Register Descriptions RegistersCommand Block Register Descriptions Features Register and Feature Extended Register Ex F1hError Register Ex F1h Device Control Register ex F6hCommand Register Ex F7h Device Register Ex F6hStatus Register Ex F7h Sata II Feature SET Device Activity SignalStaggered Spin-up Disable Control Auto-Activate in DMA Setup FISPhy. Event Counters Software Settings Preservation Sata Power ManagementATA Command Descriptions Command TableCommand Code Parameters Command Descriptions Check Power Mode E5hDevice Configuration Overlay B1h Device Configuration Overlay Feature Register ValuesCommand Download Micro Code 92hDevice Configuration Identify data structure Word Content Execute Device Diagnostics 90h Diagnostic CodesFlush Cache E7h, EAh extended Format Track 50hContent Description Identify Device information=the fields reported in word 88 are valid EXT =Media Card Pass Through command feature set supported Word Content Description WWNAutomatic Standby Timer Periods Idle E3hIdle Immediate E1h Initialize Device Parameters 91h NOP 00hRead Buffer E4h Read DMA C8h, 25h extendedRead Multiple Command C4h, 29h extended Read Log Extended 2FhRead Long 22h Read Native Max Address F8h, 27h extended Read Sectors 20h, 24h extendedRead Verify Sectors 40h, 41h extended Security Disable Password F6h Recalibrate 10hSecurity Erase Prepare F3h Security Erase Unit F4hSecurity Set Password F1h Security Erase Unit Password Word ContentSecurity Set Password data content Security Freeze Lock F5hSet Features EFh Identifier Level Command resultSecurity Unlock F2h Seek 7xh11 Set Features Register Definitions 12 Transfer Mode ValuesSet Multiple Mode C6h 13 Set Max Feature Register ValuesSet Max Address F9h, 37h extended Sleep E6h14 Smart Feature Registers Values Smart disable operations D9hSmart enable/disable attribute auto-save D2h Smart B0hSmart enable operations D8h Smart execute off-line immediate D4hSmart read data D0h 15 Device Smart Data StructureData Structure Revision Number Bit Name Description 16 Smart Attribute Status Flags17 Smart Attribute Data List 18 Off-line Data Collection Status ValuesSelf-test execution status byte 19 Self-test Execution Status ValuesSmart read log sector D5h Smart return status DAhSmart write log sector D6h Standby Immediate E0h Write Buffer E8hWrite DMA CAh, 35h extended Write Fpdma Queued 61hWrite Multiple Command C5h, 39h extended Write Long 32hWrite Sectors 30h, 34h extended Spinpoint M8 Product Manual REV Maintenance Maintenance PrecautionsGeneral Information HDD handling guide -Please handle HDD by side surfaces Service and Repair HDD handling guide Prevent Shocks