Magnetic disk storage apparatus with phase sync circuit having c

Details Magnetic disk storage apparatus with phase sync circuit having c Magnetic disk storage apparatus with phase sync circuit having c

1994-01-04

1995-04-04

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

331 25, 327157, G11B 509, H03K 500, H03L 700

Patent

active

054042500

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.

REFERENCES:
patent: 4422109 (1983-12-01), Sampei et al.
patent: 4494080 (1985-01-01), Call
patent: 4849714 (1989-07-01), Takahashi et al.
patent: 4862296 (1989-08-01), Murabayashi et al.
patent: 4894734 (1990-01-01), Fischler et al.
patent: 4980653 (1990-12-01), Shepherd
patent: 5187615 (1993-02-01), Miyazawa et al.

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