Granted Patent B2

US 10,739,839 · App. 16/140,448 · Granted Aug 11, 2020

Abstract

Claims (42)

1. A method, comprising:

receiving a request to transition a flash memory to a first stand-by mode, wherein the flash memory comprises a plurality of dies;

causing one or more guard dies of the plurality of dies to transition to the first stand-by mode while causing one or more other dies of the plurality of dies to transition to a second stand-by mode, wherein the second stand-by mode is configured to consume less power than the first stand-by mode, and the one or more other dies are different than the one or more guard dies;

receiving an input/output (I/O) request for the flash memory while the one or more other dies of the plurality of dies are in the second stand-by mode; and

causing the I/O request to be performed on the one or more guard dies that are in the first stand-by mode but not on the one or more other dies that are in the second stand-by mode.

2. The method of claim 1 , further comprising selecting the one or more guard dies from the plurality of dies, based on a leakage current profile of the plurality of dies.

3. The method of claim 1 , further comprising selecting the one or more guard dies from the plurality of dies, based on whether the one or more guard dies have been previously selected.

4. The method of claim 1 , wherein a number of the one or more guard dies selected from the plurality of dies is based on a previous operation of a host computer coupled to the flash memory.

5. The method of claim 1 , wherein causing the I/O request to be performed on the one or more guard dies is in response to determining that the one or more guard dies have capacity to perform the I/O request.

6. The method of claim 5 , wherein the I/O request is a read request, and wherein determining that the one or more guard dies have capacity comprises determining that data for the read request is stored in the one or more guard dies.

7. The method of claim 5 , wherein the I/O request is a write request, and wherein determining that the one or more guard dies have capacity comprises determining that a size of data for the write request does not satisfy a wake up threshold.

8. The method of claim 1 , wherein the request to transition the flash memory to a first stand-by mode is in response to detecting a first idle threshold has been satisfied for the flash memory.

9. The method of claim 1 , wherein the second stand-by mode causes the flash memory to use one or more circuit components to switch off a supply voltage to each of the one or more other dies that are in the second stand-by mode.

10. The method of claim 1 , further comprising:

selecting the one or more guard dies from the plurality of dies based on an access history of I/O request hits and misses recorded for the plurality of dies.

11. A data storage device, comprising:

a flash memory comprising a plurality of dies; and

a controller configured to:

receive a request to transition the flash memory to a first stand-by mode;

cause one or more guard dies of the plurality of dies to transition to the first stand-by mode;

cause one or more other dies of the plurality of dies to transition to a second stand-by mode, wherein the second stand-by mode is configured to consume less power than the first stand-by mode;

receive an input/output (I/O) request for the flash memory; and

cause the I/O request to be performed on the one or more guard dies that are in the first stand-by mode but not on the one or more other dies that are in the second stand-by mode.

12. The data storage device of claim 11 , wherein the controller is further configured to select the one or more guard dies from the plurality of dies based on one or more of: a leakage profile of the plurality of dies, a prior history of selecting guard dies from the plurality of dies, and a previous operation of a host computer associated with the flash memory.

13. The data storage device of claim 11 , wherein the controller is further configured to cause the I/O request to be performed on the one or more guard dies in response to determining that the one or more guard dies have capacity to perform the I/O request.

14. The data storage device of claim 13 , wherein when the I/O request is a read request, the controller is further configured to determine that the one or more guard dies have capacity based on whether the one or more guard dies contain data for the read request.

15. The data storage device of claim 13 , wherein when the I/O request is a write request, the controller is further configured to determine that the one or more guard dies have capacity based on whether a size of data for the write request exceeds a wake up threshold.

16. The data storage device of claim 11 , further comprising one or more gates coupled to the plurality of dies and configured to be coupled to a supply voltage, and wherein the controller is further configured to cause the one or more other dies of the plurality of dies to transition to the second stand-by mode by using the one or more gates to switch off the supply voltage to the one or more other dies that are in the second stand-by mode.

17. The data storage device of claim 11 , wherein the controller is further configured to select the one or more guard dies from the plurality of dies based on an access history of I/O request hits and misses associated with the plurality of dies.

18. A non-transitory machine-readable medium including machine-executable instructions thereon that, when executed by a processor, perform a method comprising:

receiving a request to transition a flash memory to a first stand-by mode, wherein the flash memory comprises a plurality of dies;

causing one or more guard dies of the plurality of dies to transition to the first stand-by mode;

causing one or more other dies of the plurality of dies to transition to a second stand-by mode, wherein the second stand-by mode is configured to consume less power than the first stand-by mode;

receiving an operation request for the flash memory while the one or more other dies of the plurality of dies are in the second stand-by mode; and

causing the operation request to be performed on the one or more guard dies that are in the first stand-by mode but not on the one or more other dies that are in the second stand-by mode.

19. The non-transitory machine-readable medium of claim 18 , wherein the method further comprises selecting the one or more guard dies from the plurality of dies based on at least one of: a leakage current profile of the plurality of dies, whether the one or more guard dies have been previously selected, or a previous operation of a host computer associated with the flash memory.

20. A system, comprising:

means for receiving a request to transition a flash memory to a first stand-by mode, wherein the flash memory comprises a plurality of dies;

means for causing one or more guard dies of the plurality of dies to transition to the first stand-by mode while causing one or more other dies of the plurality of dies to transition to a second stand-by mode, wherein the second stand-by mode is configured to consume less power than the first stand-by mode, and the one or more other dies are different than the one or more guard dies;

means for receiving an input/output (I/O) request for the flash memory while the one or more other dies of the plurality of dies are in the second stand-by mode; and

means for causing the I/O request to be performed on the one or more guard dies that are in the first stand-by mode but not on the one or more other dies that are in the second stand-by mode.

21. The system claim 20 , further comprising means for selecting the one or more guard dies from the plurality of dies based on one or more of: a leakage profile of the plurality of dies, a prior history of selecting guard dies from the plurality of dies, and one or more prior operations of a host computer associated with the flash memory.

Assignments (10)