Circuit for fetching (1-7) run-length-limited coded write data

Details Circuit for fetching (1-7) run-length-limited coded write data Circuit for fetching (1-7) run-length-limited coded write data

1988-09-19

1990-04-10

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

049165585

ABSTRACT:
In writing (1-7) RLL coded write data into a magnetic disk, a write data fetching circuit wherein a clock signal of a frequency three times a fundamental frequency of a write clock signal is generated based on a signal from a servo head of the magnetic disk, three clock signals are generated from the clock signal, one of the three clock signals and the write clock signal are synchronized, and the write data output in accordance with the write clock signal is subjected to (1-7) RLL encoding using a clock signal synchronized with one of the three clock signals, whereby stable (1-7) RLL encoding is made possible without the use of a precise clock signal with a 50 percent duty ratio.

REFERENCES:
patent: 4768208 (1988-08-01), Cornett
patent: 4823209 (1989-04-01), Minuhin

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