Theory and design of SEC-DED-AUED codes

To construct a single error correcting/double error detecting/all unidirectional error detecting (SEC-DED-AUED) codes a common method is to choose a SEC-DED code and then append a stream of extra bits such that the new code can detect all the unidirectional errors. An efficient method for constructing a class of SEC-DED-AUED codes is presented. The encoding/decoding algorithms proposed with this method can be implemented with simple and fast hardware. In a ROM-based implementation it results in significant saving of word length