Storage apparatus using variable read clock frequencies for read

Details Storage apparatus using variable read clock frequencies for read Storage apparatus using variable read clock frequencies for read

1998-02-03

2000-01-11

Dinh, Tan

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 48, G11B 1722, G11B 509

Patent

active

060143495

ABSTRACT:
A frequency synthesizer generates, through setting of a frequency control value, a reference clock having a frequency necessary to read data from a medium. When reading data from an arbitrary position on the medium, a setting control unit sets in the frequency synthesizer a frequency control value corresponding to the zone position, thereby allowing the frequency synthesizer to control a reference clock frequency, and sets in a single or a plurality of processing units other than the frequency synthesizer a predetermined control value corresponding to the read position on the medium. A settling wait processing unit calculates a settling time T1 required for a frequency of the frequency synthesizer to become stable and a setting processing time T2 necessary for the setting control of the other processing unit, and defines as a wait time Tw a difference (T1-T2) between the settling time T1 and the setting processing time T2, during which wait time Tw a migration to the subsequent processing is kept waiting.

REFERENCES:
patent: 5400309 (1995-03-01), Satomura
patent: 5561652 (1996-10-01), Fujiwara et al.
patent: 5623468 (1997-04-01), Takeda et al.
patent: 5717669 (1998-02-01), Kimura et al.

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