An integrated circuit having a signal bus carrying address signals includes mode selection means. The mode selection means has a default state and a non-default state. The integrated circuit is placed into a default and generic mode of operation when the mode selection means is in the default state. An address signal applied to the integrated circuit is interpreted as a specific mode of operation when the integrated circuit is in the default and generic mode of operation. The mode selection means when in the non-default state precludes placement of the integrated circuit into the default and generic mode of operation.