Dynamic read disturb handling using selective scanning
Exemplary methods, apparatuses, and systems including a scan manager for dynamic read disturb handling using selective scanning. The scan manager reads a list of wordlines to be scanned during a read disturb handling of a memory device. The memory device has separately accessible blocks of memory where each block of memory has a plurality of wordlines used to address a plurality of pages. Each block of memory is divided into a plurality of sub-blocks. The scan manager randomly selects a sub-block from the plurality of sub-blocks of a block of memory. The scan manager scans a page of the plurality of pages of a wordline from the list of wordlines of the selected sub-block during the read disturb handling.
1 . A method comprising:
reading a list of wordlines to be scanned during a read disturb handling (RDH) of a memory device, the memory device having separately accessible blocks of memory, each block of memory having a plurality of wordlines used to address a plurality of pages and each block of memory divided into a plurality of sub-blocks;
randomly selecting a sub-block from the plurality of sub-blocks of a block of memory; and
scanning a page of the plurality of pages of a wordline from the list of wordlines of the selected sub-block during the RDH.
2 . The method of claim 1 , further comprising:
obtaining a temperature value; and
selecting the wordline of the list of wordlines to be scanned using the temperature value.
3 . The method of claim 2 , further comprising:
comparing the temperature value to a temperature threshold to select the wordline of the list of wordlines, wherein the wordline is selected from a subset of wordlines from the list of wordlines.
4 . The method of claim 3 , further comprising:
omitting a wordline from the list of wordlines responsive to the comparison of the temperature value to the temperature threshold.
5 . The method of claim 1 , wherein the list of wordlines includes wordlines and corresponding pages to be scanned during RDH, further comprising:
reading a wordline and page pair from the list of wordlines to be scanned during the RDH;
determining a subset of sub-blocks from a page of the wordline and page pair; and
randomly selecting a sub-block from the subset of sub-blocks.
6 . The method of claim 1 , further comprising:
determining the RDH is a background operation; and
selecting at least one of an additional wordline, an additional page, or an additional sub-block to be scanned during the RDH.
7 . The method of claim 1 , further comprising:
determining a frequency of read operations; and
modifying the list of wordlines to be scanned during the RDH.
8 . A non-transitory computer-readable storage medium comprising instructions that, when executed by a processing device, cause the processing device to:
read a list of wordlines to be scanned during a read disturb handling (RDH) of a memory device, the memory device having separately accessible blocks of memory, each block of memory having a plurality of wordlines used to address a plurality of pages and each block of memory divided into a plurality of sub-blocks;
randomly select a sub-block from the plurality of sub-blocks of a block of memory; and
scan a page of the plurality of pages of a wordline from the list of wordlines of the selected sub-block during the RDH.
9 . The non-transitory computer-readable storage medium of claim 8 , wherein the processing device is further to:
obtain a temperature value; and
select the wordline of the list of wordlines to be scanned using the temperature value.
10 . The non-transitory computer-readable storage medium of claim 9 , wherein the processing device is further to:
compare the temperature value to a temperature threshold to select the wordline of the list of wordlines, wherein the wordline is selected from a subset of wordlines from the list of wordlines.
11 . The non-transitory computer-readable storage medium of claim 10 , wherein the processing device is further to:
omit a wordline from the list of wordlines responsive to the comparison of the temperature value to the temperature threshold.
12 . The non-transitory computer-readable storage medium of claim 8 , wherein the list of wordlines includes wordlines and corresponding pages to be scanned during RDH, and wherein the processing device is further to:
read a wordline and page pair from the list of wordlines to be scanned during the RDH;
determine a subset of sub-blocks from a page of the wordline and page pair; and
randomly select a sub-block from the subset of sub-blocks.
13 . The non-transitory computer-readable storage medium of claim 8 , wherein the processing device is further to:
determine the RDH is a background operation; and
select at least one of an additional wordline, an additional page, or an additional sub-block to be scanned during the RDH.
14 . The non-transitory computer-readable storage medium of claim 8 , wherein the processing device is further to:
determine a frequency of read operations; and
modify the list of wordlines to be scanned during the RDH.
15 . A system comprising:
a plurality of memory devices; and
a processing device, operatively coupled with the plurality of memory devices, to:
read a list of wordlines to be scanned during a read disturb handling (RDH) of a memory device, the memory device having separately accessible blocks of memory, each block of memory having a plurality of wordlines used to address a plurality of pages and each block of memory divided into a plurality of sub-blocks;
determine a frequency of read operations;
modify the list of wordlines to be scanned during the RDH;
randomly select a sub-block from the plurality of sub-blocks of a block of memory; and
scan a page of the plurality of pages of a wordline from the list of wordlines of the selected sub-block during the RDH.
16 . The system of claim 15 , wherein the processing device is further to:
obtain a temperature value; and
select the wordline of the list of wordlines to be scanned using the temperature value.
17 . The system of claim 16 , wherein the processing device is further to:
compare the temperature value to a temperature threshold to select the wordline of the list of wordlines, wherein the wordline is selected from a subset of wordlines from the list of wordlines.
18 . The system of claim 17 , wherein the processing device is further to:
omit a wordline from the list of wordlines responsive to the comparison of the temperature value to the temperature threshold.
19 . The system of claim 15 , wherein the list of wordlines includes wordlines and corresponding pages to be scanned during RDH, and wherein the processing device is further to:
read a wordline and page pair from the list of wordlines to be scanned during the RDH;
determine a subset of sub-blocks from a page of the wordline and page pair; and
randomly select a sub-block from the subset of sub-blocks.
20 . The system of claim 15 , wherein the processing device is further to:
determine the RDH is a background operation; and
select at least one of an additional wordline, an additional page, or an additional sub-block to be scanned during the RDH.