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:
Jun. 14, 2005
Filed:
May. 09, 2003
R. Dean Adams, St. George, VT (US);
Thomas J. Eckenrode, Endicott, NY (US);
Steven L. Gregor, Endicott, NY (US);
Gary S. Koch, Jeffersonville, VT (US);
R. Dean Adams, St. George, VT (US);
Thomas J. Eckenrode, Endicott, NY (US);
Steven L. Gregor, Endicott, NY (US);
Gary S. Koch, Jeffersonville, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A built-in self test system () and method for two-dimensional memory redundancy allocation. The built-in self test system is adapted to allocate two redundant columns () and one redundant row () to an embedded memory () as needed to repair single cell failures (SCFs) within the rows () and columns of the memory. The self-test system includes a left-priority encoder (), a right-priority encoder (), and a greater-than-two detector (). The left-priority encoder encodes the location of the first SCF most proximate the most-significant bit of the corresponding word. The right-priority encoder encodes the location of the first SCF most proximate the least-significant bit of the corresponding word. The greater-than-two detector determines whether a word contains more than two SCFs. If the greater-than-two detector detects that a word contains more than two SCFs, the built-in self test system identifies the corresponding row as being a must-fix row, since the number of SCFs exceeds the number of redundant columns.