SEMICONDUCTOR MEMORY DEVICE
First Claim
1. A semiconductor memory device comprising:
- a memory cell array configured by two-dimensionally arranging destructive read-out type memory cells that stored data is degraded by data read;
a decoder configured to select a memory cell in the memory cell array;
a sense amplifier configured to detect the data stored in the selected memory cell; and
a read and write controller configured to control a read operation for reading data externally from the memory cell and a write operation for writing external data in the memory cell, whereinthe read and write controller outputs a logical value of a write enable signal at the start of the read operation in a first period and makes the write enable signal invalid after the read operation starts during the first period, on the basis of the write enable signal and a restore signal keeping an activated state during the first period, the write enable signal being a signal allowing the write operation, the first period being a period from when the read operation starts to when a restore operation for writing the data back to the memory cell is completed.
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Accused Products
Abstract
A memory includes a memory cell array including destructive read-out type memory cells; a decoder selecting a cell; a sense amplifier configured to detect the data; and a read and write controller controlling a read operation and a write operation, wherein the read and write controller outputs a logical value of a write enable signal at the start of the read operation in a first period and makes the write enable signal invalid after the read operation starts during the first period, on the basis of the write enable signal and a restore signal keeping an activated state during the first period, the write enable signal being a signal allowing the write operation, the first period being a period from when the read operation starts to when a restore operation for writing the data back to the memory cell is completed.
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Citations
9 Claims
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1. A semiconductor memory device comprising:
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a memory cell array configured by two-dimensionally arranging destructive read-out type memory cells that stored data is degraded by data read; a decoder configured to select a memory cell in the memory cell array; a sense amplifier configured to detect the data stored in the selected memory cell; and a read and write controller configured to control a read operation for reading data externally from the memory cell and a write operation for writing external data in the memory cell, wherein the read and write controller outputs a logical value of a write enable signal at the start of the read operation in a first period and makes the write enable signal invalid after the read operation starts during the first period, on the basis of the write enable signal and a restore signal keeping an activated state during the first period, the write enable signal being a signal allowing the write operation, the first period being a period from when the read operation starts to when a restore operation for writing the data back to the memory cell is completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification