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1 pre-compensator, 2 variable gain amplifier (vga), 3 butterworth filter – Maxtor D540X-4K User Manual

Page 56: 4 fir (finite impulse response) filter, 5 flash a/d converter, 6 viterbi detector, 7 endec, 8 servo processor, 9 clock synthesizer, 10 pll

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Basic Principles of Operation

5-8

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

• Flash A/D Converter

• Viterbi Detector

• ENDEC

• Servo Processor

• Clock Synthesizer

• PLL

• Serial Interface

• TA Detection and Correction

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The pre-compensator introduces pre-compensation to the write data received from
the sequencer module in the DCIIA. The pre-compensated data is then passed to the
R/W Pre-Amplifier and written to the disk. Pre-compensation reduces the write
interference from adjacent write bit.

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Digital and analog controlled AGC function with input attenuator for extended range.

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Continuous time data filter which can be programmed for each zone rate.

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Digitally controlled and programmable filter for partial response signal conditioning.

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Provides very high speed digitization of the processed read signal.

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Decodes ADC result into binary bit stream.

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Provides 16/17 or 24/25 code conversion to NRZ. Includes preamble and sync mark
generation and detection.

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Servo processor with servo data recovery and burst demodulation.

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Provides programmable frequencies for each zone data rate.

2..

Provides digital read clock recovery.