SYSTEM AND METHOD OF STORING DATA AT A NON-VOLATILE MEMORY

• US 20150169228A1
• Filed: 02/10/2014
• Published: 06/18/2015
• Est. Priority Date: 12/12/2013
• Status: Abandoned Application

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Sandisk Technologies Incorporated (Western Digital Corporation)
• Inventors: MANOHAR, ABHIJEET, NAGABHIRAVA, RAJEEV, SIVASANKARAN, VIJAY, MURALIDHARAN, KIRAN KUMAR
• Application Number:
  US14/177,038
• Publication Number:
  US 20150169228A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0625 Power saving in storage systems
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A data storage device includes a controller coupled to a non-volatile memory that includes a plurality of dies. The plurality of dies includes a first die and a second die. The controller is configured to receive data to be stored into the non-volatile memory and to partition the data into a first portion and a second portion. The controller is further configured to store the first portion into the first die and to store the second portion into the second die. The first portion is stored into the first die using a single-bit mode. The second portion is stored into the second die using a multi-bit mode.

Claims

1. A method of storing data, the method comprising:

in a data storage device including a controller and a non-volatile memory, wherein the non-volatile memory includes a plurality of dies, performing;

receiving first data to be stored into the non-volatile memory;

partitioning the first data into at least a first portion and a second portion;

storing the first portion into a first die of the plurality of dies, wherein the first portion is stored using a single-bit mode; and

storing the second portion into a second die of the plurality of dies, wherein the second portion is stored using a multi-bit mode.

2. The method of claim 1, wherein a latency associated with storing the data into the non-volatile memory using the single-bit mode and the multi-bit mode is less than a latency associated with storing the data using only the multi-bit mode.

3. The method of claim 1, wherein multiple wordlines of the first die are programmed while a single wordline of the second die is programmed.

4. The method of claim 1, further comprising partitioning the first data to generate multiple data groups, wherein the first portion includes a first number of data groups of the multiple data groups, and wherein the second portion includes a second number of data groups of the multiple data groups.

5. The method of claim 4, wherein the multiple data groups are stored at a binary cache of the data storage device prior to being stored to the plurality of dies.

6. The method of claim 4, further comprising storing a first data group of the multiple data groups into the first die, wherein the first data group is stored into a first wordline of the first die using the single-bit mode.

7. The method of claim 6, further comprising:

storing a second data group of the multiple data groups into the second die, wherein the second data group is associated with a first logical page of a second wordline of the second die and is stored at the second wordline using the multi-bit mode; and

storing a third data group of the multiple data groups into the second die, wherein the third data group is associated with a second logical page of the second wordline and is stored at the second wordline using the multi-bit mode.

8. The method of claim 1, further comprising tracking which blocks of the first die are programmed using the single-bit mode.

9. A method of storing data, the method comprising:

in a data storage device including a controller and a non-volatile memory, wherein the non-volatile memory includes a plurality of dies, performing;

determining, based on a die access scheme, to use a first die of the plurality of dies in a single-bit mode and to use a second die of the plurality of dies in a multi-bit mode;

partitioning first data to be stored into the non-volatile memory into at least a first portion and a second portion;

storing the first portion of the first data into the first die according to the single-bit mode; and

storing the second portion of the first data into the second die according to the multi-bit mode.

10. The method of claim 9, wherein the die access scheme is based on a data storage rate of the non-volatile memory.

11. The method of claim 9, further comprising, prior to determining to use the first die in the single-bit mode and to use the second die in the multi-bit mode, selecting a first group of dies of the plurality of dies to store the first data,

12. The method of claim 11, wherein the first group of dies is selected from the plurality of dies based on a rotation scheme.

13. The method of claim 11, further comprising:

receiving second data to be stored at the non-volatile memory; and

selecting a second group of dies of the plurality of dies to store the second data, wherein the second group of dies includes the first die and the second die; and

determining, based on the die access scheme, to use the first die in the multi-bit mode and to use the second die in the single-bit mode.

14. The method of claim 13, further comprising:

using first write circuitry to store the first portion of the first data into the first die when the first die is in the single-bit mode; and

using second write circuitry to store a particular portion of the second data into the first die when the first die is in the multi-bit mode, wherein the second write circuitry is distinct from the first write circuitry.

15. The method of claim 9, wherein, when the first die is determined to be programmed according to the single-bit mode, a first number of blocks of the first die are allocated to be programmed according to the single-bit mode.

16. The method of claim 15, wherein, when the second die is selected to be programmed according to the multi-bit mode, a second number of blocks of the second die are allocated to be programmed according to the multi-bit mode, and wherein the first number of blocks is greater than the second number of blocks.

17. A data storage device comprising:

a non-volatile memory including a plurality of dies, wherein the plurality of dies includes a first die and a second die; and

a controller coupled to the non-volatile memory, wherein the controller is configured to receive first data to be stored into the non-volatile memory and to partition the data into a first portion and a second portion, wherein the controller is further configured to store the first portion into the first die and to store the second portion into the second die, wherein the first portion is stored into the first die using a single-bit mode, and wherein the second portion is stored into the second die using a multi-bit mode.

18. The data storage device of claim 17, wherein, prior to storing the first data into the non-volatile memory, the controller is configured to select a first group of dies of the plurality of dies and to assign each die of the first group of dies to operate according to one of the single-bit mode or the multi-bit mode, and wherein each die operates in a corresponding assigned mode during storage of the first data into the non-volatile memory.

19. The data storage device of claim 18, wherein the first group of dies includes less than all of the plurality of dies included in the non-volatile memory.

20. The data storage device of claim 18, wherein the first group of dies is selected from the plurality of dies based on a rotation scheme, and wherein each die of the first group of dies is assigned to operate according to one of the single-bit mode or the multi-bit mode based on a die access scheme.

21. The data storage device of claim 18, wherein the first group of dies is selected to store the first data, wherein the controller is further configured to receive second data to be stored into the non-volatile memory and to select a second group of dies of the plurality of dies, and wherein the second group of dies is selected to store the second data.

22. The data storage device of claim 18, wherein each die of the first group of dies is assigned to operate using one of the single-bit mode or the multi-bit mode, wherein each die of the first group of dies is assigned based on a die access scheme.

23. The data storage device of claim 22, wherein the die access scheme identifies a first number of dies of the first group of dies to operate according to the single-bit mode, a second number of dies of the first group of dies to operate according to the multi-bit mode, or a combination thereof.

24. The data storage device of claim 17, wherein the first portion stored into the first die using the single-bit mode is stored into the first die as a single-bit per storage element of the first die, and wherein the second portion stored into the second die using the multi-bit mode is stored into the second die as multiple bits per storage element of the second die.

25. The data storage device of claim 17, wherein the non-volatile memory includes first write circuitry and second write circuitry, wherein the first write circuitry is configured to operate in accordance with the single-bit mode, and wherein the second write circuitry is configured to operate in accordance with the multi-bit mode.

26. The data storage device of claim 17, wherein the non-volatile memory comprises a flash memory.