A hold circuit holds results of processing in an arithmetic circuit collectively receiving four bits from inputs. The inventive arithmetic unit collectively processes an input data string, which has generally been processed bit by bit, by four bits at a time, whereby a CRC arithmetic operation can be...http://www.google.de/patents/US6725415?utm_source=gb-gplus-sharePatent US6725415 - Arithmetic unit performing cyclic redundancy check at high speed
