STORAGE DEVICE, MEMORY CONTROLLER, AND CONTROL METHOD
First Claim
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1. A storage device, comprising:
- a first nonvolatile memory that includes memory cells, each capable of storing data of a first number of bits;
a second nonvolatile memory of which memory capacity is larger than a memory capacity of the first nonvolatile memory; and
a memory controller is configured to control the first nonvolatile memory to store data of a second number of bits that is smaller than the first number in each of at least a part of the memory cells according to a usage amount of the memory cells.
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Abstract
A storage device includes a first nonvolatile memory that includes memory cells, each capable of storing data of a first number of bits, a second nonvolatile memory of which memory capacity is larger than a memory capacity of the first nonvolatile memory, and a memory controller is configured to control the first nonvolatile memory to store data of a second number of bits that is smaller than the first number in each of at least a part of the memory cells according to a usage amount of the memory cells.
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Citations
20 Claims
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1. A storage device, comprising:
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a first nonvolatile memory that includes memory cells, each capable of storing data of a first number of bits; a second nonvolatile memory of which memory capacity is larger than a memory capacity of the first nonvolatile memory; and a memory controller is configured to control the first nonvolatile memory to store data of a second number of bits that is smaller than the first number in each of at least a part of the memory cells according to a usage amount of the memory cells. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A memory controller of a nonvolatile memory that includes memory cells, each capable of storing data of a first number of bits, the memory controller comprising:
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a memory interface unit configured to transmit data to the nonvolatile memory and receive data from the nonvolatile memory; and a control unit configured to control the nonvolatile memory to store data of a second number of bits that is smaller than the first number in each of at least a part of the memory cells according to a usage amount of the memory cells. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for controlling a storage device having a first nonvolatile memory that includes memory cells, each capable of storing data of a first number of bits, and a second nonvolatile memory of which memory capacity is larger than a memory capacity of the first nonvolatile memory, the method comprising:
controlling the first nonvolatile memory to store data of a second number of bits that is smaller than the first number in each of at least a part of the memory cells according to a usage amount of the memory cells. - View Dependent Claims (15, 16, 17, 18, 19, 20)
Specification