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. 07, 2005
Filed:
Feb. 22, 2002
Vicente V. Cavanna, Loomis, CA (US);
Patricia A. Thaler, Carmichael, CA (US);
Vicente V. Cavanna, Loomis, CA (US);
Patricia A. Thaler, Carmichael, CA (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
Methods for adjusting an m-bit CRC of sub-messages are provided. Such adjustments enable the computation of the CRC of a message by XORing the partial or incremental CRCs of composite sub-messages corresponding to the sub-messages. In a first method, the contents of an m-bit memory location are field squared and stepped to the next state as determined by the Galois field generated by the CRC generating polynomial to adjust the m-bit CRC. In a second method, the partial m-bit CRC of a sub-message is calculated according to CRC generating polynomial, P(x). A variable Y is calculated using a lookup table, where Y=xmodulo P(x). The partial m-bit CRC and Y are multiplied together and divided by P(x). The remainder of the division forms the adjusted m-bit CRC.