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. 04, 1991
Filed:
Jul. 06, 1989
Hitachi, Ltd., Tokyo, JP;
Abstract
A method and apparatus for quickly masking defective memory elements with substitute memory elements includes first and second memory blocks. The first memory block includes a first memory array and a second spare memory array. The second memory block includes a second memory array and a first spare memory array. A first word from the first memory array is selected concurrently with a first substitute word from the first spare memory. An address signal is decoded and then compared with data representative of a defective word. In the event it is determined, as a result of this comparison, that the first word is defective, the first substitute word is then communicated to a common data bus. Alternatively, the first word is communicated to the common data bus.