| 摘要 |
PROBLEM TO BE SOLVED: To provide a memory array having memory cells connected with word lines and bit lines, and capable of mask programming and one time programming.SOLUTION: All memory cells in a memory array are configured as one time programmable memory cells. Any number of these one time programmable memory cells can be converted to mask programmable memory cells by diffusion mask programming or contact/via mask programming. Since both types of memory cell can be configured by the same material, structure of such a hybrid memory array is simplified, and only one common manufacturing process is thus required. Careless user programming of mask programmable memory cells is suppressed by a programming lock circuit. |
