US Patent 7484027 Apparatus and method for configurable device pins

A method and apparatus for a configurable device contacts. A logic value on an external contact of a device is read. The external contact is selectively coupled to one of two voltage rails dependent upon the logic value. The logic value on the external contact is sensed to determine whether the logic value changed after selectively coupling the external contact to one of the two voltage rails. Based on the whether the external contact changed logic values, it is determined whether the external contact is coupled to receive a last address bit of an address.