Block pattern detection circuitry

Details Block pattern detection circuitry Block pattern detection circuitry

G - Physics

06

F

352/19.6

G06F 11/00 (2006.01) G11B 20/00 (2006.01) G11B 20/12 (2006.01) G11B 20/18 (2006.01) G11B 27/30 (2006.01)

Patent

CA 1279928

ABSTRACT OF THE DISCLOSURE Block pattern detection circuitry for the read subsystem of a streaming tape drive system comprises a state machine, a pattern decoder, a tape mark detector, a block/gap filter, a block/gap meter, a verify count section, and a block read/verify section. The incorporation of a hardware state machine within the block detect circuitry permits the application of historical detect data in the interpretation of present detect data. This provides more certain pattern recognitions. Also, state data is fed back to the block/gap filter allowing precise block boundary , triggers which are used by position capture circuity and the drive controller to effect more precise re-try positioning. The use of the block/gap filter increases the detect circuitry's immunity to noise. The advantage is enhanced where the block/gap filter uses stochastic thresholding, which is also advantageously employed by the tape mark detector.

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