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:
Feb. 02, 1982
Filed:
Dec. 31, 1979
Applicant:
Inventor:
Wing N Toy, Glen Ellyn, IL (US);
Assignee:
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364740 ;
Abstract
A circuit for the detection of errors in single and double word arithmetic logic unit operations. A microprogram processor achieves self-checking of arithmetic logic unit functions by performing single-word operations in the duplex mode and double-word operations in the simplex mode. The double-word operation is checked by performing the operation twice, generating a parity bit for each output word and comparing the parity bits generated for the two operations.