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:
Oct. 02, 1984
Filed:
Mar. 30, 1982
Russell W LaVallee, Poughkeepsie, NY (US);
Philip M Ryan, Hopewell Junction, NY (US);
Vincent F Sollitto, Jr, Rhinebeck, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A single error correcting memory is constructed from partially good components on the design assumption that the components are all-good. Those small number of logical lines containing double-bit errors are replaced when detected with good lines selected from a replacement area of the memory. The replacement area is provided by a flexibly dynamically deallocated portion of the main memory so that it can be selected from any section of the original memory by inserting the appropriate page address in the replacement-page register. With such a memory architecture until the first double-bit error is detected (either in testing or actual use) all pages may be used for normal data storage. When such an error is detected some temporarily unused page in the memory is deal-located, that is rendered unavailable for normal storage, and dedicated to providing substitute lines. The same procedure is followed for subsequent faults. If the replacement area itself becomes defective, a different page may be chosen to provide substitute lines simply by providing a different address in the replacement page register.