Nonvolatile memory controller and method for erase suspend management that increments the number of program and erase cycles after erase suspend
First Claim
Patent Images
1. A method comprising:
- identifying an erase-suspend limit;
sending an erase suspend command to a nonvolatile memory device to suspend an erase operation of the nonvolatile memory device;
each time that the erase suspend command is sent to the nonvolatile memory device;
determining a pre-suspend time, wherein the pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation;
summing the determined pre-suspend time with all previously determined pre-suspend times for the erase operation to obtain a first sum; and
comparing the first sum to the erase-suspend limit to determine whether the erase-suspend limit has been reached; and
incrementing a number of program and erase cycles when the erase-suspend limit has been reached.
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Abstract
A nonvolatile memory controller and a method for erase suspend management are disclosed. The nonvolatile memory controller includes an erase suspend circuit configured for determining a pre-suspend time each time that an erase operation of the nonvolatile memory device is suspended and for determining whether an erase-suspend limit has been reached using the determined pre-suspend time. The erase suspend circuit is further configured for incrementing the number of program and erase cycles when the erase-suspend limit has been reached.
281 Citations
20 Claims
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1. A method comprising:
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identifying an erase-suspend limit; sending an erase suspend command to a nonvolatile memory device to suspend an erase operation of the nonvolatile memory device; each time that the erase suspend command is sent to the nonvolatile memory device; determining a pre-suspend time, wherein the pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation; summing the determined pre-suspend time with all previously determined pre-suspend times for the erase operation to obtain a first sum; and comparing the first sum to the erase-suspend limit to determine whether the erase-suspend limit has been reached; and incrementing a number of program and erase cycles when the erase-suspend limit has been reached. - View Dependent Claims (2, 3)
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4. A method comprising:
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identifying a first erase-suspend limit, a second erase-suspend limit and a third erase-suspend limit, wherein the first erase-suspend limit is greater than the second erase-suspend limit and the second erase-suspend limit is greater than the third erase-suspend limit; each time that an erase operation of a nonvolatile memory device is suspended; determining a pre-suspend time, wherein the pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation; counting the number of suspends having a pre-suspend time that does not exceed a first pre-suspend time threshold to obtain a first sum; counting the number of suspends having a pre-suspend time that exceeds the first pre-suspend time threshold and that does not exceed a second pre-suspend time threshold to obtain a second sum; and counting the number of suspends having a pre-suspend time that exceeds the second pre-suspend time threshold to obtain a third sum; and incrementing a number of program and erase cycles when the first sum reaches the first erase-suspend limit or when the second sum reaches the second erase-suspend limit or when the third sum reaches the third erase-suspend limit. - View Dependent Claims (5)
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6. A method comprising:
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identifying an erase-suspend limit; sending an erase suspend command to a nonvolatile memory device to suspend an erase operation of the nonvolatile memory device; each time that the erase suspend command is sent to the nonvolatile memory device; determining a pre-suspend time, wherein the pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation; determining a weighted pre-suspend time using the determined pre-suspend time; summing the determined weighted pre-suspend time with all previously determined weighted pre-suspend times for the erase operation to obtain a first sum; and comparing the first sum to the erase-suspend limit to determine whether the erase-suspend limit has been reached; and incrementing a number of program and erase cycles when the erase-suspend limit has been reached. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A nonvolatile memory controller comprising:
an erase suspend circuit configured for suspending an erase operation of a nonvolatile memory device by sending an erase suspend command to the nonvolatile memory device, each time that the erase suspend command is sent to the nonvolatile memory device, the erase suspend circuit configured for; determining a pre-suspend time, wherein the determined pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the determined pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation; summing the determined pre-suspend time with all previously determined pre-suspend times for the erase operation; comparing the sum to an erase-suspend limit to determine whether the erase-suspend limit has been reached; and incrementing a number of program and erase cycles when the erase-suspend limit has been reached.
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13. A nonvolatile memory controller comprising:
an erase suspend circuit configured for suspending an erase operation of a nonvolatile memory device by sending an erase suspend command to the nonvolatile memory device, each time that the erase suspend command is sent to the nonvolatile memory device, the erase suspend circuit configured for; determining a pre-suspend time, wherein the determined pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the determined pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation; counting the number of suspends of the erase operation having a pre-suspend time that does not exceed a first pre-suspend time threshold to obtain a first sum; counting the number of suspends of the erase operation having a pre-suspend time that exceeds the first pre-suspend time threshold to obtain a second sum; comparing the first sum to a first erase-suspend limit; comparing the second sum to a second erase-suspend limit; and incrementing a number of program and erase cycles when the first sum reaches the first erase-suspend limit or when the second sum reaches the second erase-suspend limit. - View Dependent Claims (14)
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15. A nonvolatile memory controller comprising:
an erase suspend circuit configured for suspending an erase operation of a nonvolatile memory device by sending an erase suspend command to the nonvolatile memory device, each time that the erase suspend command is sent to the nonvolatile memory device, the erase suspend circuit configured for; determining a pre-suspend time, wherein the determined pre-suspend time for a first suspend of the erase operation is the time between a start of the erase operation and the first suspend of the erase operation, and the determined pre-suspend time for each additional suspend of the erase operation is the time between a resumption of the erase operation and the following suspend of the erase operation; determining a weighted pre-suspend time using the determined pre-suspend time; summing the determined weighted pre-suspend time with all previously determined weighted pre-suspend times for the erase operation; comparing the sum to an erase-suspend limit to determine whether the erase-suspend limit has been reached; and incrementing a number of program and erase cycles when the erase-suspend limit has been reached. - View Dependent Claims (16, 17, 18, 19, 20)
Specification