| 摘要 |
<p>Mask ROMS with fixed code implantation and associated integrated circuits are described. An integrated circuit has a Mask ROM including: an array of memory cells including a first bank of memory cells and a second bank of memory cells, and the first bank of memory cells separated from the second bank of memory cell by a set of select lines, and the first bank of memory cells and the second bank of memory cells includes at least one fixed code implanted memory cell column. The use of fixed code implantation results in a single current path during the reading of a given memory cell and permits the size of the corresponding device to be reduced and have better topography. The Mask ROM provides additional advantages because the use of the same select transistors for two banks reduces the overhead of select transistors for a given size of array, the use of only one sense amplifier per block reduces the overhead of sense amplifiers for a given size of array, and the use of odd and even word line decoders divides the memory cell array into a number of banks.</p> |
