Maxtor D540X-4K manual TTQTfirmware%QTTGEVKQP. %QFG%%%QPVTQN

Basic Principles of Operation

The integrated µProcessor, Disk Controller, and ATA Interface Electronics have nine functional modules (described below):

•µProcessor

•Digital Synchronous Spoke (DSS)

•Error Correction Code (ECC) Control

•Formatter

•Buffer Controller

•Servo Controller, including PWM

•Serial Interface

•ATA Interface Controller

•Motor Controller

z2TQEGUUQTThe µProcessor￿core provides local processor services to the drive electronics under program control. The µProcessor manages the resources of the Disk Controller, and ATA Interface internally. It also manages the Read/Write ASIC (Application Specific Integrated Circuit), and the Spindle/VCM driver externally.

&KIKVCNThe￿DSS5[PJTQPQWUdecodes servo￿5RQMGinformation written on the drive at the factory to determine the position of the read/write head. It interfaces with the read/write channel, process timing and position information, and stores it in registers that are read by the servo

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The Error Correction Code (ECC) Control block utilizes a Reed-Solomon encoder/ decoder circuit that is used for disk read/write operations. It uses a total of 36 redundancy bytes organized as 32 ECC (Error Correction Code) bytes with four interleaves, and four cross-check bytes. The ECC uses eight bits per symbol and four interleaves. This allows quadruple-burst error correction of at least 96, and as many as 128 bits in error.

￿￿￿￿￿(QTOCVVGTThe Formatter controls the operation of the read and write channel portions of the ASIC. To initiate a disk operation, the µProcessor loads a command into the ASIC registers.

The Formatter also directly drives the read and write gates (RG, WG) and Command Mode Interface of the Read/Write ASIC and the R/W Preamplifier, as well as passing write data to the Precompensator circuit in the Read/Write ASIC.

5-6 Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT