Combination scan management for block families of a memory device

Patent metadata

Field	Value
Publication number	US-11941277-B2
Application number	US-202318118082-A
Country	US
Kind code	B2
Filing date	Mar 6, 2023
Priority date	Nov 20, 2020
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

An example memory sub-system includes a memory device and a processing device, operatively coupled to the memory device. The processing device is configured to initiate a scan process on a plurality of block families of the memory device; responsive to determining, based on the scan process, that a first block family of the plurality of block families and a second block family of the plurality of block families meet a combining criterion, merge the first block family and the second block family; and responsive to determining that a terminating condition has been satisfied, terminate the scan process.

First claim

What is claimed is:

1. A system comprising:
a memory device; and
a processing device, operatively coupled to the memory device, the processing device is to perform operations comprising:
performing a read operation on a plurality of block families of the memory device; and
responsive to determining that a first block family of the plurality of block families and a second block family of the plurality of block families meet a combining criterion, merging the first block family and the second block family, wherein the combining criterion is based on a data state metric reflecting a temporal voltage shift (TVS) of blocks associated with the first block family and the second block family.

2. The system of claim 1 , wherein performing the read operation is responsive to determining that a triggering condition has been satisfied.

3. The system of claim 2 , wherein determining that the triggering condition has been satisfied comprises at least one of:
determining that a number of free block family entries within a metadata table is below a threshold; or
determining that a predetermined period of time has elapsed since execution of a previous read operation.

4. The system of claim 1 , wherein the plurality of block families are ordered from newest block families to oldest block families.

5. The system of claim 1 , wherein the operations further comprise:
updating the combining criterion based on a number of free block family entries within a metadata table, during execution of the read operation, wherein more or less block families are combined based on the updated combining criterion.

6. The system of claim 1 , wherein the operations further comprise:
updating voltage offset bin assignments of one or more block families of the plurality of block families.

7. The system of claim 1 , wherein the combining criterion is updated during execution of the read operation.

8. The system of claim 1 , wherein the combining criterion is based on a data state metric of each block family of the plurality of block families.

9. The system of claim 1 , wherein the operations further comprise: determining that a terminating condition has been satisfied, wherein the terminating condition comprises at least one of:
determining that a number of free block family entries within a metadata table reached a threshold;
determining that the plurality of block families has been scanned; or

determining that a number of host-initiated requests received at the memory device during execution of the read operation exceeds a threshold.

10. A method comprising:
detecting that a number of free block family entries within a metadata table of a memory device is below a predetermined threshold;
performing a read operation on a plurality of block families referenced by the metadata table; and
responsive to determining that a first block family of the plurality of block families and a second block family of the plurality of block families meet a combining criterion, merging the first block family and the second block family wherein the combining criterion is based on a data state metric reflecting a temporal voltage shift (TVS) of blocks associated with the first block family and the second block family.

11. The method of claim 10 , wherein merging the first block family and the second block family further comprises:
assigning blocks of the second block family to the first block family; and
deleting an entry associated with the second block family from the metadata table.

12. The method of claim 10 , wherein merging the first block family and the second block family further comprises:
adding, to the metadata table, a metadata item referencing a new block family;
assigning blocks of the first block family and blocks of the second block family to the new block family; and
deleting entries associated with the first block family and the second block family from the metadata table.

13. The method of claim 10 , wherein the plurality of block families are ordered from newest block families to oldest block families.

14. The method of claim 10 , further comprising:
responsive to determining that a terminating condition has been satisfied, terminating the read operation.

15. The method of claim 14 , further comprising: determining that a terminating condition has been satisfied, wherein the terminating condition comprises at least one of:
determining that a number of free block families entries within a metadata table reached a threshold;
determining that the plurality of block families has been scanned; or

determining that a number of host-initiated requests received at the memory device during execution of the read operation exceeds a threshold.

16. A non-transitory computer-readable storage medium comprising instructions that, when executed by a processing device, cause the processing device to:
performing a read operation on a plurality of block families of a memory device; and
responsive to determining that a first block family of the plurality of block families and a second block family of the plurality of block families meet a combining criterion, merge the first block family and the second block family, wherein the combining criterion is based on a data state metric reflecting a temporal voltage shift (TVS) of blocks associated with the first block family and the second block family.

17. The non-transitory computer-readable storage medium of claim 16 , wherein the processing device is to initiate the read operation responsive to determining that a triggering condition has been satisfied.

18. The non-transitory computer-readable storage medium of claim 17 , wherein the triggering condition comprises at least one of:
determining that a number of free block family entries within a metadata table is below a threshold; or
determining that a predetermined period of time has elapsed since execution of a previous read operation.

19. The non-transitory computer-readable storage medium of claim 16 , wherein the plurality of block families are ordered from newest block families to oldest block families.

20. The non-transitory computer-readable storage medium of claim 16 , wherein the processing device is further to:
merge a subset of the plurality of block families into a single block family, responsive to determining that the subset of the plurality of block families meets a combining criterion, the subset of block families comprising two or more block families.

Assignees

• Micron Technology Inc

Inventors

• Nowell Shane
• Sheperek Michael
• Koudele Larry J
• Rayaprolu Vamsi Pavan

Classifications

• G06F3/064 Primary

  Management of blocks · CPC title

• G06F3/0619

  in relation to data integrity, e.g. data losses, bit errors · CPC title

• G06F3/0629

  Configuration or reconfiguration of storage systems · CPC title

• G06F3/0653

  Monitoring storage devices or systems · CPC title

• G06F3/0659

  Command handling arrangements, e.g. command buffers, queues, command scheduling · CPC title