公开(公告)号：SG86330A1

公开(公告)日：2002-02-19

申请号：SG1998002745

申请日：1998-08-04

Applicant: IBM

Inventor： TATSUYA SAKAI ,  MASAYUKI MURAKAMI ,  NAOYUKI KAGAMI ,  YUZO NAKAGAWA

IPC: G11B21/10 ,  G11B5/596 ,  G11B5/00 ,  G11B19/02 ,  G11B19/00 ,  G11B5/09 ,  G11B5/55

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.