Servo mark detection device

Details Servo mark detection device Servo mark detection device

1997-12-22

2000-01-11

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 51, G11B 509

Patent

active

060142766

ABSTRACT:
A servo mark detection device includes a synchronizing circuit, first and second shift registers, a frame pattern detection circuit, a control circuit, and a servo mark comparator. The synchronizing circuit detects a peak of the signal amplitude of a data pattern and outputs a synchronization data signal synchronized with a clock. The first shift register sequentially stores the synchronization data signal and outputs a latch data signal. The detection circuit determines the frame pattern of the latch data signal, outputs a determination data signal, determines a phase shift of the latch data signal with respect to the clock, and outputs a phase correction signal. The control circuit outputs a frame pulse signal at a predetermined clock period, outputs a frame pulse signal at a timing corrected with respect to the predetermined clock period on the basis of the phase correction signal, and outputs a check window signal when a predetermined number of frame pulse signals are output. The second shift register sequentially latches the determination data signal in synchronism with the frame pulse signal, and outputs a servo mark data signal. The comparator compares the servo mark signal with a predetermined reference pattern when the check window signal is active, and outputs a servo mark detection signal.

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