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US 2010/0161891 A1Published application
Method of controlling card-shaped memory device
AssigneeKabushiki Kaisha Toshiba
InventorTakashi OSHIMA
Life of this patent
Estimating the term…
Abstract
Each of a plurality of memory areas includes a plurality of blocks. Each of the blocks includes a plurality of pages. Each of the memory areas also includes a data cache and a page buffer. A control unit controls a lower-limit value of the number of empty blocks in each of the plurality of memory areas.
Claims19
(canceled)
A method of controlling a semiconductor memory device, comprising:
- determining whether a number of free blocks in a first memory area is not more than a first value;
- when the number of free blocks in the first memory area is more than the first value, writing data to a free block in the first memory area;
- when the number of free blocks in the first memory area is not more than the first value, determining whether a number of free blocks in a second memory area is not more than a second value;
- and
- when the number of free blocks in the second memory area is more than the second value, writing data to a free block in the second memory area.
2 more elements
A method of controlling a semiconductor memory device, comprising:
- referring a number of free blocks in a first memory area;
- referring a number of free blocks in a second memory area;
- when the number of free blocks in the first memory area is more than the number of free blocks in the second memory area, writing data to a free block in the first memory area;
- and
- when the number of free blocks in the second memory area is more than the number of free blocks in the first memory area, writing data to a free block in the second memory area.
2 more elements
A semiconductor memory device comprising:
- a first memory area including a plurality of blocks;
- a second memory area including a plurality of blocks;
- and
- a control unit configured to
- determine whether a number of free blocks in a first memory area is not more than a first value,
- when the number of free blocks in the first memory area is more than the first value, write data to a free block in the first memory area,
- when the number of free blocks in the first memory area is not more than the first value, determine whether a number of free blocks in a second memory area is not more than a second value, and
- when the number of free blocks in the second memory area is more than the second value, write data to a free block in the second memory area.
5 more elements
A semiconductor memory device comprising:
- a first memory area including a plurality of blocks;
- a second memory area including a plurality of blocks;
- and
- a control unit configured to
- refer a number of free blocks in a first memory area,
- refer a number of free blocks in a second memory area,
- when the number of free blocks in the first memory area is more than the number of free blocks in the second memory area, write data to a free block in the first memory area, and
- when the number of free blocks in the second memory area is more than the number of free blocks in the first memory area, write data to a free block in the second memory area.
5 more elements
Dependencies are inferred from the claim text.