System and method for data inversion in a storage resource

Patent metadata

Field	Value
Publication number	US-9400748-B2
Application number	US-201514595511-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Nov 14, 2011
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A method may comprise receiving a page of data to be stored on a storage resource. The method may also comprise determining, for each particular inversion mode of a plurality of inversion modes, the number of bits of the page of data to be inverted to store a representation of the page of data in accordance with the particular inversion mode. The method may additionally comprise determining a selected inversion mode from the plurality of inversion modes for the page of data, the selected inversion mode comprising the inversion mode for which the least number of physical bit transitions are required to store the representation of the page of data in accordance with the selected inversion mode. The method may further comprise storing the representation of the page of data in a data memory in accordance with the inversion mode.

First claim

What is claimed is:

1. A method comprising:
determining, for each particular inversion mode of a plurality of inversion modes, a number of bits of a page of data to be inverted to store a representation of the page of data in accordance with the particular inversion mode;
determining a selected inversion mode from the plurality of inversion modes, for which the least number of bits of the page are to be inverted to store the representation of the page of data in accordance with the selected inversion mode; and
storing the representation of the page of data in a data memory in accordance with the selected inversion mode;
wherein each particular inversion mode defines an identity of bits within the page of data that are inverted to generate the representation of the page of data;
wherein at least one particular inversion mode defines a bit within the page of data to be inverted and a bit within the page of data not to be inverted.

2. A method according to claim 1 , further comprising storing an inversion mode field indicative of the selected inversion mode as part of the representation of the page of data.

3. A method according to claim 2 , wherein storing the inversion mode field comprises:
performing a modulo function based on a logical address of the page of data; and
storing the inversion mode field within the representation of the page of data at a location based on the modulo function.

4. A method according to claim 1 , wherein the plurality of inversion modes comprise at least two of: an even-bits inversion mode, an odd-bits inversion mode, an even-bit-pairs inversion mode, an odd-bit-pairs inversion mode; and even-nibbles inversion mode; an odd-nibbles inversion mode; a first-bit-pair inversion mode; a second-bit-pair inversion mode; a third-bit-pair inversion mode; and a fourth-bit-pair inversion mode.

5. A method according to claim 1 , further comprising, in response to a request to read the page of data:
reading the representation of the page data from the data memory; and
inverting bits of the representation of data in accordance with the selected inversion mode.

6. A method according to claim 1 , wherein the data memory is a flash memory.

7. A method according to claim 1 , wherein the data memory is a NAND-based flash memory.

8. A storage resource comprising:
a data memory configured to store data; and
logic communicatively coupled to the data memory and configured to:
determine, for each particular inversion mode of a plurality of inversion modes, a number of bits of a page of data to be inverted to store a representation of the page of data in accordance with the particular inversion mode;
determine a selected inversion mode from the plurality of inversion modes for the page of data, for which the least number of bits are to be inverted to store the representation of the page of data in accordance with the selected inversion mode; and
store the representation of the page of data in the data memory in accordance with the inversion mode;
wherein each particular inversion mode defines an identity of bits within the page of data that are inverted to generate the representation of the page of data;
wherein at least one particular inversion mode defines a bit within the page of data to be inverted and a bit within the page of data not to be inverted.

9. A storage resource according to claim 8 , the logic further configured to store an inversion mode field indicative of the selected inversion mode as part of the representation of the page of data.

10. A storage resource according to claim 9 , the logic further configured to, in order to store the inversion mode field:
perform a modulo function based on a logical address of the page of data; and
store the inversion mode field within the representation of the page of data at a location based on the modulo function.

11. A storage resource according to claim 8 , wherein the plurality of inversion modes comprise at least two of: an even-bits inversion mode, an odd-bits inversion mode, an even-bit-pairs inversion mode, an odd-bit-pairs inversion mode; and even-nibbles inversion mode; an odd-nibbles inversion mode; a first-bit-pair inversion mode; a second-bit-pair inversion mode; a third-bit-pair inversion mode; and a fourth-bit-pair inversion mode.

12. A storage resource according to claim 8 , the logic further configured to, in response to a request to read the page of data:
read the representation of the page data from the data memory; and
invert bits of the representation of data in accordance with the selected inversion mode.

13. A storage resource according to claim 8 , wherein the data memory is a flash memory.

14. A storage resource according to claim 8 , wherein the data memory is a NAND-based flash memory.

15. An information handling system comprising:
a processor; and
a storage resource communicatively coupled to the processor and configured to:
determine, for each particular inversion mode of a plurality of inversion modes, a number of bits of a page of data to be inverted to store a representation of the page of data in accordance with the particular inversion mode;
determining a selected inversion mode from the plurality of inversion modes for the page of data, for which the least number of physical bit transitions are required to store the representation of the page of data in accordance with the selected inversion mode; and
store the representation of the page of data in a data memory of the storage resource in accordance with the inversion mode;
wherein each particular inversion mode defines an identity of bits within the page of data that are logically inverted to generate the representation of the page of data;
wherein at least one particular inversion mode defines a bit within the page of data to be inverted and a bit within the page of data not to be inverted.

16. An information handling system according to claim 15 , the storage resource further configured to store an inversion mode field indicative of the selected inversion mode as part of the representation of the page of data.

17. An information handling system according to claim 15 , the storage resource further configured to, in order to store the inversion mode field:
perform a modulo function based on a logical address of the page of data; and
store the inversion mode field within the representation of the page of data at a location based on the modulo function.

18. An information handling system according to claim 15 , wherein the plurality of inversion modes comprise at least two of: an even-bits inversion mode, an odd-bits inversion mode, an even-bit-pairs inversion mode, an odd-bit-pairs inversion mode; and even-nibbles inversion mode; an odd-nibbles inversion mode; a first-bit-pair inversion mode; a second-bit-pair inversion mode; a third-bit-pair inversion mode; and a fourth-bit-pair inversion mode.

19. An information handling system according to claim 15 , the storage resource further configured to, in response to a request to read the page of data:
read the representation of the page data from the data memory; and
invert bits of the representation of data in accordance with the selected inversion mode.

20. An information handling system according to claim 15 , wherein the data memory is a flash memory.

Assignees

• Dell Products Lp

Inventors

• Kotzur Gary B
• Dawkins William Price

Classifications

• G11C16/10

  Programming or data input circuits · CPC title

• G06F3/0638 Primary

  Organizing or formatting or addressing of data · CPC title

• G06F2212/1036

  Life time enhancement · CPC title

• G11C16/349 Primary

  Arrangements for evaluating degradation, retention or wearout, e.g. by counting erase cycles · CPC title

• G06F2212/2022

  Flash memory · CPC title