Performance of a read in a memory system
Improving performance of a read in a memory system. Various methods include: reading data from a word line in a memory block, where during the read, associated parameters are generated that include: a value indicative of a throughput time, and a value indicative of a bit error rate (BER); retrieving the value indicative of the throughput time and the value indicative of the BER; and performing a read improvement process if the value indicative of the throughput time is above a threshold value. The method also includes performing the read improvement process by: flagging the memory block if the value indicative of the BER is at or below and expected BER; and performing cleanup operations if the value indicative of the BER is higher than the expected BER.
1. A method of improving performance of a read in a memory system comprising:
reading data from a word line in a memory block, and generating associated parameters that include:
a value indicative of a throughput time, and
a value indicative of a bit error rate (BER);
retrieving the value indicative of the throughput time and the value indicative of the BER; and
performing a read improvement process if the value indicative of the throughput time is above a threshold value, the read improvement process comprising:
performing cleanup operations if the value indicative of the BER is higher than an expected BER, the cleanup operations comprising:
modifying a set of read parameters associated with the memory block, thereby creating modified read parameters,
reading test data from the word line using the modified read parameters and generating a value indicative of a test bit error rate,
determining if the value indicative of the test bit error rate is above a BER threshold, and
flagging the memory block if the value indicative of the BER is at or below the expected BER;
determining that a number of times the memory clock is flagged is above a threshold amount; and
performing the cleanup operations.
2. The method of claim 1 , the cleanup operations further comprising:
if the BER indicative value is not above the BER threshold, performing a read scrub that re-scrambles the data using a scrambling seed different from a prior scrambling seed and moves the data to a different location.
3. The method of claim 1 , further comprising retrieving the value indicative of the BER and the value indicative of the throughput time from registers of an error correction engine.
4. A non-transitory computer readable media storing instructions that are executable by a processor to cause a memory system to:
read data in a memory block, wherein:
the memory block includes a plurality of word lines, and
the data is located in a first word line of the plurality of word lines;
retrieve a value indicative of a throughput time and a value indicative of a bit error rate (BER), wherein the value indicative of the throughput time and the value indicative of the BER are generated based on the read; and
perform a read improvement process if the value indicative of the throughput time is above a threshold value, the read improvement process comprising:
performing cleanup operations if the value indicative of the BER is higher than an expected BER, the cleanup operations comprising:
modifying a set of read parameters associated with the memory block, thereby creating modified read parameters,
reading test data form the word line using the modified read parameters and generating a value indicative of a test bit error rate,
determining if the value indicative of the test bit error rate is above a BER threshold, and
flagging the memory block if the value indicative of the BER is at or below the expected BER;
determining that a number of times the memory clock is flagged is above a threshold amount; and
performing the cleanup operations.
5. The non-transitory computer-readable media of claim 4 , the cleanup operations further comprising:
if the BER indicative value is not above the BER threshold, performing a read scrub that re-scrambles the data using a scrambling seed different from a prior scrambling seed and moving the second data to a different location.
6. A non-volatile storage system comprising:
a memory array, wherein:
the memory array comprises a plurality of non-volatile memory cells arranged as memory blocks, and
a first memory block of the memory blocks includes a word line storing a first data; and
a controller coupled to the memory array, wherein the controller is configured to:
read the first data from the first memory block;
retrieve, from an error correction engine, a value indicative of a throughput time and a value indicative of a bit error rate (BER); and
perform a read improvement process if the value indicative of the throughput time is above a threshold value, the read improvement process comprising:
comprising performing cleanup operations if the value indicative of the BER is higher than an expected BER, the cleanup operations comprising:
modifying a set of read parameters associated with the first memory block, thereby creating modified read parameters,
reading test data form the word line using the modified read parameters and generating a value indicative of a test bit error rate,
determining if the value indicative of the test bit error rate is above a BER threshold, and
flagging the memory block if the value indicative of the BER is at or below the expected BER;
determining that a number of times the memory clock is flagged is above a threshold amount; and
performing the cleanup operations.
7. The non-volatile storage system of claim 6 , the cleanup operations further comprising:
if the BER indicative value is not above the expected BER, perform a read scrub that re-scrambles the data using a scrambling seed different from a prior scrambling seed and moves the first data to a different memory block.