Disk drive, servo control unit, and control unit
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United States of America Patent
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-
Jan 13, 2004
Grant Date -
Sep 26, 2002
app pub date -
Aug 13, 1998
filing date -
Aug 13, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A disk drive, a servo controller, and a controller which have realized high-degree control by lightening processing load to a microprocessor unit (MPU) without increasing cost is disclosed. An analog/digital (AD) converter (ADC) performs the AD conversions of the regenerated levels A, B, C, and D of burst patterns supplied from a channel and retains the converted levels in an ADC register. A servo assist (SA) computes parameters, such as the position error of a head, independently of an MPU, based on the regenerated levels of the burst patterns retained in the ADC register and an instruction from the MPU retained in a SRAM. Based on the computed parameters, the SA computes servo data (DACOUT) for driving a voice coil motor and supplies the servo data to the DAC section of a VCM driver section through a SIO.
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