US 2019/0294368 A1 · NONVOLATILE MEMORY DEVICE CONTROLLING PARTICAL USAGE RESTRICTION FOR MEMORY CELL ARRAY AND CONTROL METHOD

Abstract

According to one embodiment, a nonvolatile memory device includes a memory cell array, first and second storage units, and control unit. The memory cell array includes erase unit areas. The first storage units correspond respectively to the erase unit areas and store items of first information indicating whether a first usage restriction is to be imposed on the corresponding erase unit areas. The second storage units correspond respectively to the erase unit areas and store items of second information indicating whether a second usage restriction is to be imposed on the corresponding erase unit areas. The control unit executes switching control on whether the first usage restriction is to be imposed or not and whether the second usage restriction is to be imposed or not on the memory cell array based on the first and second information.

Claims20

Dependent claims

A nonvolatile memory device comprising:

a memory cell array comprising a plurality of erase unit areas each of which comprises a plurality of read unit areas;
a plurality of first storage units which correspond respectively to the erase unit areas and store a plurality of items of first information indicating whether a first usage restriction is to be imposed on the corresponding erase unit areas;
a plurality of second storage units which correspond respectively to the erase unit areas and store a plurality of items of second information indicating whether a second usage restriction is to be imposed on the corresponding erase unit areas;
and
a control unit which executes switching control on whether the first usage restriction is to be imposed or not and whether the second usage restriction is to be imposed or not on the memory cell array based on the first information and the second information.

2 more elements

A method of controlling an access to a memory cell array, the memory cell array comprising a plurality of erase unit areas, each of the erase unit areas comprising a plurality of read unit areas, the method comprising:

storing a plurality of items of first information indicating whether a first usage restriction is to be imposed on the corresponding erase unit areas or not in a plurality of first storage units corresponding respectively to the erase unit areas;
storing a plurality of items of second information indicating whether a second usage restriction is to be imposed on the corresponding erase unit areas or not in a plurality of second storage units corresponding respectively to the erase unit areas;
and
executing switching control on whether the first usage restriction is to be imposed or not or whether the second usage restriction is to be imposed or not on the memory cell array based on the first and second information.

1 more element

Dependencies are inferred from the claim text.

Nonvolatile memory device controlling partical usage restriction for memory cell array and control method

Life of this patent

Nonvolatile memory device controlling partical usage restriction for memory cell array and control method

Life of this patent

Abstract

Claims20