Monitoring error correction operations performed in memory
The present disclosure includes apparatuses and methods for monitoring error correction operations performed in memory. A number of embodiments include a memory and circuitry configured to determine a quantity of erroneous data corrected during an error correction operation performed on soft data associated with a sensed data state of a number of memory cells of the memory, determine a quality of soft information associated with the erroneous data corrected during the error correction operation performed on the soft data, and determine whether to take a corrective action on the sensed data based on the quantity of the erroneous data corrected during the error correction operation and the quality of the soft information associated with the erroneous data corrected during the error correction operation.
1. An apparatus, comprising:
a memory; and
circuitry configured to:
determine a bit error rate associated with an error correction operation performed on sensed data states of a number of memory cells of the memory and soft data associated with the sensed data states;
determine a high reliability error rate associated with the error correction operation; and
determine whether to take a corrective action on the sensed data states by:
plotting a data point corresponding to the bit error rate and the high reliability error rate in a two-dimensional bit error rate versus high reliability error rate space, wherein the two-dimensional bit error rate versus high reliability error rate space includes a curve corresponding to a correction limit of the error correction operation; and
determining a location of the data point relative to the curve in the two-dimensional bit error rate versus high reliability error rate space.
2. The apparatus of claim 1 , wherein the two-dimensional bit error rate versus high reliability error rate space includes a number of additional curves, wherein each respective curve corresponds to a different margin amount associated with the curve that corresponds to the correction limit of the error correction operation.
3. the apparatus of claim 2 , wherein the number of additional curves comprises three additional curves.
4. The apparatus of claim 1 , wherein the error correction operation is a successful error correction operation.
5. A method for operating memory, comprising:
determining a bit error rate associated with an error correction operation performed on sensed data states of a number of memory cells and soft data associated with the sensed data states;
determining a high reliability error rate associated with the error correction operation; and
determining whether to take a corrective action on the sensed data states by:
plotting a data point corresponding to the bit error rate and the high reliability error rate in a two-dimensional bit error rate versus high reliability error rate space, wherein the two-dimensional bit error rate versus high reliability error rate space includes a curve corresponding to a correction limit of the error correction operation; and
determining a location of the data point relative to the curve in the two-dimensional bit error rate versus high reliability error rate space.
6. The method of claim 5 , wherein the method includes determining whether to take the corrective action based on whether the location of the data point is on a first side of the curve or a second side of the curve in the two-dimensional bit error rate versus high reliability error rate space.
7. The method of claim 5 , wherein:
the two-dimensional bit error rate versus high reliability error rate space includes a number of additional curves, wherein each respective additional curve corresponds to a different margin amount associated with the curve that corresponds to the correction limit of the error correction operation; and
the method includes determining whether to take the corrective action based on the location of the data point relative to the number of additional curves in the two-dimensional bit error rate versus high reliability error rate space.
8. The method of claim 7 , wherein:
the curve and the number of additional curves split the two-dimensional bit error rate versus high reliability error rate space into a number of regions; and
the method includes determining whether to take the corrective action based on which of the number of regions the location of the data point is in.
9. The method of claim 8 , wherein each respective region corresponds to a different probability that the error correction operation performed on the soft data will fail.
10. The method of claim 5 , wherein the method includes:
determining the bit error rate using a controller;
determining the high reliability error rate using the controller; and
determining whether to take the corrective action using the controller.
11. The method of claim 10 , wherein the error correction operation is performed by an error correction component of the controller.
12. An apparatus, comprising:
a memory; and
circuitry configured to:
sense a data state of a number of memory cells of the memory and soft data associated with the sensed data states;
perform an error correction operation on the sensed data states and soft data;
determine a bit error rate associated with the error correction operation;
determine a high reliability error rate associated with the error correction operation; and
determine whether to take a corrective action on the sensed data states by:
plotting a data point corresponding to the bit error rate and the high reliability error rate in a two-dimensional bit error rate versus high reliability error rate space, wherein the two-dimensional bit error rate versus high reliability error rate space includes a curve corresponding to a correction limit of the error correction operation; and
determining a location of the data point relative to the curve in the two-dimensional bit error rate versus high reliability error rate space.
13. The apparatus of claim 12 , wherein the circuitry is configured to:
take the corrective action if the location of the data point is on a first side of the curve in the two-dimensional space; and
not take the corrective action if the location of the data point is on a second side of the curve in the two-dimensional space.
14. The apparatus of claim 12 , wherein the circuitry is configured to generate the curve based on previous error correction operations performed on previously sensed data states of the number of memory cells and soft data associated with the previously sensed data states.
15. The apparatus of claim 12 , wherein the curve is a pre-generated curve.
16. The apparatus of claim 12 , wherein the curve extends downward from a line in the two-dimensional bit error rate versus high reliability error rate space where bit error rate and high reliability error rate are equal.
17. The apparatus of claim 12 , wherein the two-dimensional bit error rate versus high reliability error rate space comprises a log-log scale graph having bit error rate on an x-axis of the graph and high reliability error rate on a y-axis of the graph.