| 摘要 |
A mask ROM having a plurality of memory cell blocks, each composed of a main bit line, a ground line, and a plurality of memory cells for storing information. The mask ROM also includes a sense amplifier for reading the information stored in the memory cells via the main bit line. The mask ROM has a plurality of first block selecting means for selecting a memory cell block connected to the main bit line from a plurality of the memory cell blocks and a plurality of second block selecting means for selecting a memory cell block connected to the ground line from a plurality of the memory cell blocks. The first and second block selecting means are arranged alternately, with the memory cell block sandwiched therebetween.
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