Provided is a semiconductor storage device wherein data can be rewritten at a high speed with a small current consumption on a memory cell array having a variable resistive element.
To overcome this "memory wall," the speed of the control circuitry that transfers data between the memory cell array and external data bus must be increased.
A nonvolatile semiconductor storage device provided with a highly integrated memory cell array wherein consumption current increase caused by a transient current due to potential change of a bit line and a word line is suppressed during shifts among modes of reading, writing and erasing.
Provided is a nonvolatile memory device with which it is possible to lay bit lines and word lines of a memory cell array with minimum space therebetween, without disposing margins in designs of read circuits.
With the present structure, a highly complex step such as integrated working of the resistive random-access material and silicon becomes unnecessary, and it is possible to provide a memory cell array with a simpler process than before.
Since the read amplifier for reading the erase setting information stored in the volatile memory cell array is provided separately for the erase operation and the read operation, it is possible to read independently for each operation and store the erase setting information with a high storage density by using a minimum storage capacity.
Moreover, a sense amplifier circuit that uses a single bit line to read data from a memory cell is disposed in a space appearing in the memory cell array, thereby effectively using the area.
If the read burst length signal represents one burst length and the first and the second control access commands include a read request, the data input/output control circuit reads out from a memory cell array M bits of data respectively in response to read requests of the first and the second control access commands.
A memory cell array (1) includes a plurality of memory cells arranged in a matrix and storing data by use of n values exhibiting first, second through n-th states (where n is a natural number equal to or greater than two).
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