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The current market for flash memories is growing tremendously fast. In particular, the communications and commercial segments are remarkable. Mitsubishi Electric Corp. (Mitsubishi) and Hitachi, Ltd. (Hitachi) started co-developing flash memories in January of 1994 under these circumstances.
Flash memory is beginning to separate into two areas by its usage. One is working storage suitable for program memory, which needs fast random access time, so the memory must connect to the I/O bus directly. Another is file storage suitable for data memory, which needs fast serial access time, so the memory is connected to the I/O bus the same as the hard disk.
Using the divided bit line NOR (DINOR) memory cell from Mitsubishi that is most suited to working storage and the AND memory cell from Hitachi that is most suited to file storage, we can adapt to a wide variety of market needs.