Nonvolatile semiconductor storage device, nonvolatile semiconductor storage system and method of managing of defective column in nonvolatile semiconductor storage system
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United States of America Patent
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Dec 25, 2012
Grant Date -
May 10, 2012
app pub date -
Jan 18, 2012
filing date -
Mar 2, 2007
priority date (Note) -
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Abstract
A nonvolatile semiconductor storage device is disclosed, which includes a memory cell array in which nonvolatile memory cells are arranged, a first data holding circuit which temporarily holds a collective processing unit of read or write data to be simultaneously read from or written to the memory cells, a circuit which takes out the data held in the first data holding circuit from the device, and a second data holding circuit in which data is automatically set at a time when power supply is turned on and in which the data is changeable based on a command input to the device, wherein the collective processing unit is equal to a sum of the number of units used within the device and the maximum number of units continuously output from the device to outside or input to the device from outside.
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