US Patent RE42135 Multi-protocol data classification using on-chip cam

An apparatus is equipped with a content addressable memory (CAM) to store one or more key entries corresponding to a data class represented by the CAM. Each of the one or more key entries is associated with a key tag corresponding to one of one or more subclasses of the data class. The apparatus is further equipped with logic coupled to the CAM to extract a data key from a data stream, to compare all or part of the data key with the one or more key entries to determine if the data key is a member of the data class, and to classify the data key as belonging to one of the one or more subclasses of the data class if the data key is determined to be a member of data class.