| 摘要 |
A memory array having both mask programmable and one-time programmable memory cells connected to the wordlines and the bitlines. All memory cells of the memory array are configured as one-time programmable memory cells. Any number of these one-time programmable memory cells are convertible into mask programmable memory cells through mask programming, such as diffusion mask programming or contact/via mask programming. Manufacturing of such a hybrid memory array is simplified because both types of memory cells are constructed of the same materials, therefore only one common set of manufacturing process steps is required. Inadvertent user programming of the mask programmable memory cells is inhibited by a programming lock circuit.
|
