Storage control system with erase block mechanism and method of operation thereof

• US 9,239,781 B2
• Filed: 10/10/2012
• Issued: 01/19/2016
• Est. Priority Date: 02/07/2012
• Status: Active Grant

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Smart Storage Systems Incorporated (Western Digital Corporation)
• Inventors: Jones, Ryan, Ellis, Robert W.
• Primary Examiner(s): Thammavong, Prasith
• Application Number:
  US13/648,869
• Publication Number:
  US 20130205102A1
• Time in Patent Office: 1,196 Days
• Field of Search: 711/154
• US Class Current: 1/1
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 12/06 Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication G06F12/08 takes precedence
• CPC Class Codes: G06F 13/1684 using multiple buses

Abstract

A method of operation of a storage control system includes: partitioning memory channels with memory devices; selecting a super device with one of the memory devices from one of the memory channels, the super device having a super chip select connected to chip selects of the memory devices; and selecting a super block associated with the super device.

Claims

1. A method of operation of a storage system comprising a plurality of memory devices partitioned into a plurality of memory groups, the method comprising:

selecting a super block corresponding to a super device;

wherein the super block comprises a plurality of blocks from a first subset of the plurality of memory devices, the first subset including at least one memory device from each of two or more of the memory groups; and

wherein the super device comprises a plurality of super blocks including the super block;

performing an operation on the super block; and

updating metadata corresponding to the super block;

wherein the metadata is stored in one or more blocks within the super block, the one or more blocks designated for storing non-host information; and

wherein the metadata includes a program-erase count indicative of the number of times the super block has been programmed and erased.

2. The method as claimed in claim 1 wherein the performed operation is a program operation or an erase operation.

3. The method as claimed in claim 1 wherein selecting the super block includes utilizing a super chip select corresponding the super block to select the super block, wherein the super chip select controls a chip select of each memory device in the first subset of the plurality of memory devices.

4. The method as claimed in claim 1 wherein the super block includes one or more spare blocks.

5. The method as claimed in claim 4 further comprising:

in accordance with a determination that the super block contains a bad block, remapping the super block, the remapping comprising;

designating the bad block as an unusable block; and

designating a spare block of the one or more spare blocks as a usable block; and

updating the metadata corresponding to the super block, wherein updating the metadata includes updating a mapping of the super block and updating a valid page count for the super block.

6. The method as claimed in claim 1 wherein the operation is a program operation and the method further comprises writing parity information within the super block, the parity information corresponding to the program operation.

7. The method as claimed in claim 1

wherein the metadata includes information corresponding to host data stored within the super block.

8. The method as claimed in claim 1 wherein the plurality of super blocks include the super block and a second super block, the second super block comprising a second plurality of blocks;

wherein the plurality of blocks comprising the first super block correspond to a first plane; and

wherein the second plurality of blocks correspond to a second plane, distinct from the first plane.

9. The method as claimed in claim 1 wherein the storage system comprises a plurality of super devices, including the super device;

and

the method further comprises;

designating a first subset of the plurality of super devices as available for host operations, the first subset including the super device;

designating a second subset of the plurality of super devices as requiring recycling; and

designating a third subset of the plurality of super devices as available for receiving data from super devices being recycled.

10. The method as claimed in claim 9 wherein designating the first subset of the plurality of super devices as available for host operations includes designating the first subset based in part on health information corresponding to the first subset of super devices.

11. A storage system comprising:

a plurality of memory devices partitioned into a plurality of memory groups; and

a storage controller coupled to the plurality of memory devices, the storage controller configured to;

select a super block corresponding to a super device;

wherein the super block comprises a plurality of blocks from a first subset of the plurality of memory devices, the first subset including at least one memory device from each of two or more of the memory groups; and

wherein the super device comprises a plurality of super blocks including the super block;

perform an operation on the super block; and

update metadata corresponding to the super block;

wherein the metadata is stored in one or more blocks within the super block, the one or more blocks designated for storing non-host information; and

wherein the metadata includes a program-erase count indicative of the number of times the super block has been programmed and erased.

12. The system as claimed in claim 11 wherein the performed operation is a program operation or an erase operation.

13. The system as claimed in claim 11 wherein selecting the super block includes utilizing a super chip select corresponding the super block to select the super block, wherein the super chip select controls a chip select of each memory device in the first subset of the plurality of memory devices.

14. The system as claimed in claim 11 wherein the super block includes one or more spare blocks.

15. The system as claimed in claim 11 the storage controller further configured to:

in accordance with a determination that the super block contains a bad block, remap the super block, the remapping comprising;

designating the bad block as an unusable block; and

designating a spare block of the one or more spare blocks as a usable block; and

update the metadata corresponding to the super block, wherein updating the metadata includes updating a mapping of the super block and updating a valid page count for the super block.

16. The system as claimed in claim 11 wherein the operation is a program operation and the storage controller is further configured to write parity information within the super block, the parity information corresponding to the program operation.

17. The system as claimed in claim 11

wherein the metadata includes information corresponding to host data stored within the super block.

18. The system as claimed in claim 11 wherein the plurality of super blocks include the super block and a second super block, the second super block comprising a second plurality of blocks;

wherein the plurality of blocks comprising the first super block correspond to a first plane; and

wherein the second plurality of blocks correspond to a second plane, distinct from the first plane.

19. The system as claimed in claim 11 wherein the storage system comprises a plurality of super devices, including the super device;

and

the storage controller is further configured to;

designate a first subset of the plurality of super devices as available for host operations, the first subset including the super device;

designate a second subset of the plurality of super devices as requiring recycling; and

designate a third subset of the plurality of super devices as available for receiving data from super devices being recycled.

20. The system as claimed in claim 19 wherein designating the first subset of the plurality of super devices as available for host operations includes designating the first subset based in part on health information corresponding to the first subset of super devices.