A semiconductor memory device is installed in one of a single data output and a parallel data output model, and a single data output unit associated with a first diagnostic unit and a parallel data output unit with a second diagnostic unit are incorporated in the semiconductor memory device for selective...http://www.google.fr/patents/US5079747?utm_source=gb-gplus-shareBrevet US5079747 - Semiconductor memory device having diagnostic unit operable on parallel data bits
Semiconductor memory device having diagnostic unit operable on parallel data ...
