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:
Jul. 18, 1995
Filed:
Nov. 17, 1992
Applicant:
Inventors:
David M Purdham, Brooklyn Park, MN (US);
David C Johnson, Roseville, MN (US);
Assignee:
Unisys Corporation, Blue Bell, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 511 ; 371 492 ;
Abstract
A method of and apparatus for continuous parity checking within a CMOS SRAM memory system. Each cell has added circuitry which permits continuous reading of the binary state of the cell. The states of each cell are combined to produce a parity determination for a given data array. By continuously monitoring parity in this manner, the time of failure as well as the fact of failure can be determined.