Maxtor D540X-4K manual On the drive

Basic Principles of Operation

￿￿￿￿￿$WHHGTThe￿%QPVTQNNGTBuffer Controller supports a 1.75 MB buffer. The 16-bit width implementation provides a 60 MB/s maximum buffer bandwidth. This increased bandwidth allows the µProcessor to have direct access to the buffer, eliminating the need for a separate µProcessor RAM IC.

The Buffer Controller supports both drive and host address rollover and reloading, to allow for buffer segmentation. Drive and host addresses may be separately loaded for automated read/write functions.

The Buffer Controller operates under the direction of the µProcessor.

￿￿￿￿￿5GTXQThe￿2TQEGUUQTServo Processor in the Read Write Channel ASIC provides servo data recovery and burst demodulation to extract the actuator position information. This information is processed in the controller ASIC/microprocessor, and a control signal is output to the VCM in the Power ASIC. This controls the current in the actuator coil which controls the position of the actuator.

4GCFThe￿9TKVGRead/Write￿+PVGTHCEGinterface allows the integrated µprocessor, disk controller to communicate with the Read/Write chip.

#6#The￿+PVGTHCEGATA Interface￿%QPVTQNNGTController portion of the ASIC provides data handling, bus control, and transfer management services for the ATA interface. Configuration and control of the interface is accomplished by the µController across the MAD bus. Data

￿￿transfer operations are controlled by the Buffer Controller module.

/QVQTThe￿%QPVTQNNGTMotor Controller controls the spindle and voice coil motor (VCM) mechanism

￿￿￿on the drive.

4GCFThe￿9TKVGRead/Write￿#5+%ASIC integrates an Advanced Partial Response Maximum Likelihood (PRML) processor, a selectable code rate Encoder-Decoder (ENDEC), and a Servo Processor with data rates up to 270 MHz (259 Mb/s). Programming is done through a fast 40 MHz serial interface. The controller and data interface through an 8-bit wide data interface. The Read/Write ASIC is a low power 3.3 Volts, single supply, with selective power down capabilities.

The Read/Write ASIC comprises 12 main functional modules (described below):

•Pre-Compensator

•Variable Gain Amplifier (VGA)

•Butterworth Filter

•FIR Filter

Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT 5-7