Excavating
Patent
1991-02-15
1993-05-11
Canney, Vincent P.
Excavating
371 403, H03M 1300
Patent
active
052107604
ABSTRACT:
Pointer control logic for error correcting codes includes a set of registers the contents of which are rotated whenever data from a track with a pointer are processed. In that manner, a given one register always contains pointer data for the track under consideration (if that track has a pointer). The pointer control logic includes programmable initializing values to stress write operations as desired. Further, the logic contains multiple and programmable pointer dropping thresholds so that pointer registers can be candidates for dropping dependent on the type of error encountered. Provision is made for extending pointer life when errors are encountered, registers are full, and no register has dropped below the pointer dropping threshold.
REFERENCES:
patent: 5109385 (1992-04-01), Karp et al.
patent: 5136592 (1992-08-01), Weng
Bentley Steven R.
Callsen Gary W.
Karp James M.
West Stephen C.
Canney Vincent P.
International Business Machines - Corporation
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