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. 13, 1996
Filed:
Jul. 22, 1992
John R Kinsel, San Jose, CA (US);
Silicon Graphics, Inc., Mountain View, CA (US);
Abstract
An error detection system wherein 64 bits of data word are protected by 8 check bits which yield 8-bit syndromes. Single-bit errors are indicated by syndromes that contain exactly three '1's or by syndromes that contain exactly five '1's in which bits 0-3 or 4-7 of the syndrome are all '1.' Single-bit errors that occur from faulty check bits are indicated by syndromes that contain exactly one '1.' All two-bit errors, and four-bit errors within a nibble, are indicated by syndromes that contain an even number of '1's (i.e., an even number of '1's). Three-bit errors within a nibble are indicated by syndromes that contain five '1's in which bits 0-3 of the syndrome and bits 4-7 of the syndrome are not all '1.' Four-bit errors within a nibble are indicated by syndromes that contain four '1's. In another embodiment of the invention, 25 bits of data word are protected by 7 check bits yielding 7-bit syndromes. Single-bit errors are indicated by syndromes that contain exactly three '1' s except single-bit errors that occur from faulty check bits are indicated by syndromes that contain exactly one '1'. Two-bit errors are indicated by syndromes that contain an even number of '1's, and three-bit errors within a nibble are indicated by syndromes that contain five '1's or seven '1's. Four-bit errors within a nibble are indicated by syndromes that contain four '1's or six '1's.