System for aligning control words for identifying boundaries of

Details System for aligning control words for identifying boundaries of System for aligning control words for identifying boundaries of

1997-06-17

1999-12-07

Lee, Thomas C.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711 4, 711118, 711133, 714 8, 714798, G06F 704

Patent

active

06000018&

ABSTRACT:
A disk sequencer, which is loaded with control words from a format table and a frame number associated with the first control word loaded, automatically cycles through loaded control words and finds a control word that corresponds to the current position of a data sector. The disk sequencer includes a first counter that is initialized according to a frame number read from a servo sector or according to an index mark and incremented for each end-of-servo pulse so that the first counter accurately indicates the current position of a data head to a data frame granularity. A second counter is loaded with a data frame number associated with the control words, and the second counter is incremented each time the last control word for a data frame is discarded. For automatic alignment, the disk sequencer cycles through and discards control words until comparison of the counts in the two counters indicates the control words are properly aligned.

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