Patent ID: 6947305
Filing Date: 2005-09-20
Classification: G11C,H01L

Abstract:
1. A method for identifying a circuit, said method comprising: (a) providing a plurality of integrated circuits, each integrated circuit comprising a plurality of vertically stacked device layers, a source, a sensing contact, and a conductive path extending across at least some of the stacked device layers, said integrated circuits comprising first ones of the integrated circuits, in which the conductive path interconnects the respective sensing contact and source, and second ones of the integrated circuits, in which the conductive path does not interconnect the respective sensing contact and source; (b) supplying circuit identification signals selected from a first set with the first integrated circuits in response to sensed signals on the respective sensing contacts within a first range of values; and (c) supplying circuit identification signals selected from a second set with the second integrated circuits in response to sensed signals on the respective sensing contacts within a second range of values.