发明名称 Multi-spindle synchronization control system for magnetic disk apparatus
摘要 A multi-spindle synchronization control system for a magnetic disk apparatus includes a plurality of magnetic disk units each for receiving a reference clock pulse to control rotation of a spindle motor and detecting rotation of the spindle motor to generate an index pulse, a crystal oscillator for generating a master clock having a predetermined frequency, a counter for converting the master clock into a master index pulse generated upon each rotation of the spindle motor, and a plurality of spindle synchronization control circuits, each connected to a corresponding one of the plurality of magnetic disk units, for detecting a timing relationship between the master index pulse and the index pulse from the corresponding magnetic disk unit, omitting some pulses of the master clock in accordance with the detection result, and counting down the partially-omitted pulse train to output the reference clock pulse.
申请公布号 US4918544(A) 申请公布日期 1990.04.17
申请号 US19880207984 申请日期 1988.06.17
申请人 NEC CORPORATION 发明人 ISHIZUKA, HIROMI;MACHIDA, TAKASHI
分类号 G11B19/28;G11B27/10 主分类号 G11B19/28
代理机构 代理人
主权项
地址