Magnetic disk storage apparatus with phase sync circuit having controllable response characteristics
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United States of America Patent
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May 27, 1997
Issued Date -
N/A
app pub date -
Dec 21, 1994
filing date -
Oct 30, 1989
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A magnetic disk storage apparatus provides with a phase locked loop or a phase sync circuit including a phase comparator, a charge pump, a filter and a voltage-controlled oscillator. The phase sync circuit includes a register which is connected to an information processing system and adapted to store therein the response characteristics of the phase comparator, the charge pump, the filter and the voltage-controlled oscillator as instructed from the information processing system. In this way, in accordance with the information on the response characteristics from the information processing system, the phase sync circuit is controlled thereby to assure a stable operation even in the case of the data transfer speed varying between inner and outer track such as occurs in a magnetic disk.
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