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:
Jan. 27, 2004
Filed:
Oct. 25, 2000
Daniel R. Cassiday, Topsfield, MA (US);
Randall D. Rettberg, Danville, CA (US);
David L. Satterfield, Tewksbury, MA (US);
Thomas J. Moser, Acton, MA (US);
Sun Microsystems, Inc., Palo Alto, CA (US);
Abstract
System and method for rapidly calculating CRC values for messages including encoded bits is described. Tabularized CRC values are used in combination with a logical grid to quickly determine an appropriate CRC value of a message. This determination can take into account encoded inversion bits in the message. A collection of pre-calculated CRC values are arranged in a single-column table and then implemented with selected bits of a message by superimposing the bits in each CRC value onto a logical grid. Vertical lines of the grid are associated with 30 exclusive OR (XOR) gates and horizontal lines are associated with bits in an 88-bit message (or the 30 bits of a CRC value or with 8 bits of a sequence number). Through this grid, the inputs to the XOR gates are determined, thereby facilitating rapid calculations of CRC values due to the high processing speeds possible in XOR gates.