The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1993
Filed:
Feb. 15, 1991
Steven R Bentley, Tucson, AZ (US);
Gary W Callsen, Centreville, VA (US);
James M Karp, Tucson, AZ (US);
Stephen C West, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
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.