Efficient crc remainder coefficient generation and checking device and method
CA 2129236 C · Owner: Motorola, Inc. · Inventors: Pasco-Anderson, James A.; Li, Shiping
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Various parallel CRC remainder coefficient generation devices (100 200, 300, 500, 600, 700) and methods (1100 1200) are described for, providing efficient error detection in various digital data communication systems (800, 900 ,1000). A K-bit CRC remainder is calculated from m bits at time, where m can be less than equal to, or greater than K, and, where the processing of each of the m bits requires a total of j K-bit table look-up into a total of j tables (410, 412 414, 516, 518, 520, 522, 616, 614, 712 714) of 2b entries each, where m = jb. Also required are one m-bit exclusive-or operation (208, 306 506, 608, 706), a total of, (j-l)K-bit exclusive-or operations (422 532, 626, 628, 720), …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 6, 1993 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.