PROGRAMMABLE ROM USING TWO BONDED STRATA AND METHOD OF OPERATION

摘要

A read only memory implemented as a 3D integrated device has a first stratum, a second stratum , and bonded inter-strata connections for coupling the first stratum to the second stratum. The physical bonding between the two strata implements the programming of the read only memory. The stratum may be in wafer form or in die form. The first stratum includes functional active devices (27, 46) and at least one non-programmed active device (41, 43). The second stratum includes at least conductive routing (17) to be associated with the at least one non-programmed active device. The bonded inter-strata connections include at least one bonded programmable inter-strata connection for programming the at least one non-programmed active device and for providing conductive routing to the programmed active device. The two strata thus form a programmed ROM. Other types of programmable storage devices may be implemented by bonding the two strata.