Techniques for prolonging a lifetime of memory by controlling operations that affect the lifetime of the memory

• US 8,230,183 B2
• Filed: 07/26/2010
• Issued: 07/24/2012
• Est. Priority Date: 11/24/2006
• Status: Expired due to Fees

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Danilak, Radoslav
• Primary Examiner(s): SONG, HUA JASMINE
• Application Number:
  US12/843,851
• Publication Number:
  US 20110167199A1
• Time in Patent Office: 729 Days
• Field of Search: 711/100, 711/112, 711/154, 711170-172, 711/E12.001, 711/E12.008
• US Class Current: 711/154
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/1036 Life time enhancement

Abstract

Techniques are provided for prolonging a lifetime of memory by controlling operations that affect the lifetime of the memory. At least one aspect associated with the memory lifetime is identified and at least one of the operations is delayed, based on the at least one aspect. The operations include a write operation, an erase operation, a program operation, and/or any other operation that is capable of reducing the memory lifetime.

Claims

1. A system comprising:

a controller;

at least one memory device;

wherein the controller is enabled to

identify at least one aspect associated with a lifetime of at least one memory device,

determine that an operation from a host processor is of a lifetime reducing type with respect to the at least one memory device,

compute an estimated lifetime of the at least one memory device based on the operation,

compare the estimated lifetime with a required lifetime, and

delay at least a part of the operation, conditionally based on

the at least one aspect,

the determining, and

the comparing; and

further wherein

the computing is based on an integral function including a rate of operations of the lifetime reducing type,

the rate of operations exceeds a maximum average rate of operations of the lifetime reducing type, and

the maximum average rate is based on the required lifetime.

2. The system of claim 1, wherein the lifetime comprises at least one of a desired lifetime, an actual lifetime, and an estimated lifetime.

3. The system of claim 1, wherein the at least one aspect comprises at least one of a period of time, a rate of operations that reduce the lifetime that the at least one aspect is associated with, a total permitted number of the operations that reduce the lifetime that the at least one aspect is associated with, and a duration of the lifetime that the at least one aspect is associated with.

4. The system of claim 1, wherein the at least one aspect comprises a frequency of writing.

5. The system of claim 1, wherein the at least one memory device comprises a nonvolatile memory device.

6. The system of claim 5, wherein the nonvolatile memory device comprises at least one of a single-bit per cell NOR flash memory, a multi-bit per cell NOR flash memory, a single-bit per cell NAND flash memory, a multi-bit per cell NAND flash memory, a multi-level-multi-bit per cell NAND flash, and a large block flash memory.

7. A method comprising:

identifying at least one aspect associated with a lifetime of at least one memory device;

determining, by a controller coupled to a host processor and to the at least one memory device, that an operation from the host processor is of a lifetime reducing type with respect to the at least one memory device;

computing an estimated lifetime of the at least one memory device based on the operation;

comparing the estimated lifetime with a required lifetime;

delaying, at least a part of the operation, conditionally based on

the at least one aspect,

the determining, and

the comparing; and

wherein

the computing is based on an integral function including a rate of operations of the lifetime reducing type,

the rate of operations exceeds a maximum average rate of operations of the lifetime reducing type, and

the maximum average rate is based on the required lifetime.

8. The method of claim 7, wherein the lifetime comprises at least one of a desired lifetime, an actual lifetime, and an estimated lifetime.

9. The method of claim 7, wherein the at least one aspect comprises at least one of a period of time, a rate of operations that reduce the lifetime that the at least one aspect is associated with, a total permitted number of the operations that reduce the lifetime that the at least one aspect is associated with, and a duration of the lifetime that the at least one aspect is associated with.

10. The method of claim 7, wherein the at least one aspect comprises a frequency of writing.

11. The method of claim 7, wherein the at least one memory device comprises a nonvolatile memory device.

12. The method of claim 11, wherein the nonvolatile memory device comprises at least one of a single-bit per cell NOR flash memory, a multi-bit per cell NOR flash memory, a single-bit per cell NAND flash memory, a multi-bit per cell NAND flash memory, a multi-level-multi-bit per cell NAND flash, and a large block flash memory.

13. A system comprising:

a means for identifying at least one aspect associated with a lifetime of at least one memory device;

a means for determining, by a controller coupled to a host processor and to the at least one memory device, that an operation from the host processor is of a lifetime reducing type with respect to the at least one memory device;

a means for computing an estimated lifetime of the at least one memory device based on the operation;

a means for comparing the estimated lifetime with a required lifetime;

a means for delaying, at least a part of the operation, conditionally based on

the at least one aspect,

the means for determining, and

the means for comparing; and

wherein

the means for computing is based on an integral function including a rate of operations of the lifetime reducing type,

the rate of operations exceeds a maximum average rate of operations of the lifetime reducing type, and

the maximum average rate is based on the required lifetime.

14. The system of claim 13, wherein the lifetime comprises at least one of a desired lifetime, an actual lifetime, and an estimated lifetime.

15. The system of claim 13, wherein the at least one aspect comprises at least one of a period of time, a rate of operations that reduce the lifetime that the at least one aspect is associated with, a total permitted number of the operations that reduce the lifetime that the at least one aspect is associated with, and a duration of the lifetime that the at least one aspect is associated with.

16. The system of claim 13, wherein the at least one aspect comprises a frequency of writing.

17. The system of claim 13, wherein the at least one memory device comprises a nonvolatile memory device.

18. The system of claim 17, wherein the nonvolatile memory device comprises at least one of a single-bit per cell NOR flash memory, a multi-bit per cell NOR flash memory, a single-bit per cell NAND flash memory, a multi-bit per cell NAND flash memory, a multi-level-multi-bit per cell NAND flash, and a large block flash memory.

19. A computer program product embodied on a tangible computer readable medium, wherein when executed by a computer processor, the computer program product enables functions comprising:

computer code to identify at least one aspect associated with a lifetime of at least one memory device;

computer code to determine, via a controller coupled to a host processor and to the at least one memory device, that an operation from the host processor is of a lifetime reducing type with respect to the at least one memory device;

computer code to compute an estimated lifetime of the at least one memory device based on the operation;

computer code to compare the estimated lifetime with a required lifetime;

computer code to delay at least a part of the operation, conditionally based on

the at least one aspect,

results of the computer code to determine, and

results of the computer code to compare; and

wherein

the computing is based on an integral function including a rate of operations of the lifetime reducing type,

the rate of operations exceeds a maximum average rate of operations of the lifetime reducing type, and

the maximum average rate is based on the required lifetime.

20. The computer program product of claim 19, wherein the lifetime comprises at least one of a desired lifetime, an actual lifetime, and an estimated lifetime.

21. The computer program product of claim 19, wherein the at least one aspect comprises at least one of a period of time, a rate of operations that reduce the lifetime that the at least one aspect is associated with, a total permitted number of the operations that reduce the lifetime that the at least one aspect is associated with, and a duration of the lifetime that the at least one aspect is associated with.

22. The computer program product of claim 19, wherein the at least one aspect comprises a frequency of writing.