STORAGE DEVICE AND METHOD USING PARAMETERS BASED ON PHYSICAL MEMORY BLOCK LOCATION

• US 20150006800A1
• Filed: 09/17/2014
• Published: 01/01/2015
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Sandisk Technologies Incorporated (Western Digital Corporation)
• Inventors: ALROD, IDAN, SHARON, ERAN
• Granted Patent: US 9,141,524 B2
• Time in Patent Office: Days
• US Class Current: 711/103
• CPC Class Codes: G06F 11/1068 in sector programmable memories, e.g. flash disk G06F11/1072 takes precedence
• CPC Class Codes: G06F 12/0207 with multidimensional access, e.g. row/column, matrix
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/2022 Flash memory
• CPC Class Codes: G06F 2212/7201 Logical to physical mapping or translation of blocks or pages
• CPC Class Codes: G11C 16/10 Programming or data input circuits

Abstract

A method includes determining a block identifier of a physical block of a memory array that is to be accessed. The method further includes determining a word line index of a first word line that is to be accessed within the physical block based on the block identifier and further based on a first position of the first word line within the physical block. The method further includes selecting a first value of a first parameter according to a first group of word lines that is associated with the word line index and accessing the first word line using the first value of the first parameter.

Claims

1. A method comprising:

determining a block identifier of a physical block of a memory that is to be accessed;

determining a word line index of a first word line that is to be accessed within the physical block based on the block identifier and further based on a first position of the first word line within the physical block, wherein the word line index is associated with a physical location of the first word line within the memory;

selecting a first value of a first parameter according to a first group of word lines that is associated with the word line index; and

accessing the first word line using the first value of the first parameter, wherein the first group of word lines includes the first word line and also includes a second word line within a second physical block, wherein a second group of word lines includes a third word line within the physical block and also includes a fourth word line at the first position within the second physical block, and wherein the second group of word lines corresponds to a second value of the first parameter that is different than the first value of the first parameter.

2. The method of claim 1, wherein the first word line includes a first indicator corresponding to the first value of the first parameter.

3. The method of claim 2, wherein the first word line includes a second indicator corresponding to a first value of a second parameter.

4. The method of claim 1, wherein the first word line includes an indicator corresponding to a first set of values, and wherein the first set of values includes the first value of the first parameter and a first value of a second parameter.

5. The method of claim 4, wherein the first set of values corresponds to a first entry of a table, and wherein the table also includes a second entry corresponding to a second set of values.

6. The method of claim 5, wherein the first word line and the second word line are associated with the first entry of the table, and wherein the third word line and the fourth word line are associated with the second entry of the table.

7. The method of claim 6, further comprising:

acquiring a set of parameter values corresponding to the first word line;

comparing the acquired set of parameter values to the first set of values and to the second set of values; and

associating the first word line with the first entry of the table based on the comparison.

8. The method of claim 1, wherein the first value corresponds to a physical location-dependent parameter value that is at least partially based on a physical location of the physical block within the memory and that is to be used in an error decoding operation.

9. The method of claim 1, wherein the second value corresponds to a time-dependent parameter value.

10. The method of claim 1, wherein the memory includes a three-dimensional array of memory cells, and wherein the memory is included in a data storage device that includes circuitry associated with operation of the three-dimensional array of memory cells.

11. A data storage device comprising:

a memory; and

a controller, wherein the controller is coupled to the memory, and wherein the controller is configured to determine a block identifier of a physical block of the memory to be accessed and to determine a word line index of a first word line that is to be accessed within the physical block based on the block identifier and further based on a first position of the first word line within the physical block, wherein the word line index is associated with a physical location of the first word line within the memory, wherein the controller is further configured to select a first value of a first parameter according to a first group of word lines that is associated with the word line index and to access the first word line using the first value of the first parameter, wherein the first group of word lines includes the first word line and also includes a second word line within a second physical block, wherein a second group of word lines includes a third word line within the physical block and also includes a fourth word line at the first position within the second physical block, and wherein the second group of word lines corresponds to a second value of the first parameter that is different than the first value of the first parameter.

12. The data storage device of claim 11, wherein the first word line includes a first indicator corresponding to the first value of the first parameter.

13. The data storage device of claim 12, wherein the first word line includes a second indicator corresponding to a first value of a second parameter.

14. The data storage device of claim 11, wherein the first word line includes an indicator corresponding to a first set of values, and wherein the first set of values includes the first value of the first parameter and a first value of a second parameter.

15. The data storage device of claim 14, wherein the first set of values corresponds to a first entry of a table, and wherein the table also includes a second entry corresponding to a second set of values.

16. The data storage device of claim 15, wherein the first word line and the second word line are associated with the first entry of the table, and wherein the third word line and the fourth word line are associated with the second entry of the table.

17. The data storage device of claim 16, wherein the controller is further configured to acquire a set of parameter values corresponding to the first word line, to compare the acquired set of parameter values to the first set of values and to the second set of values, and to associate the first word line with the first entry of the table based on the comparison.

18. The data storage device of claim 11, wherein the first value is a physical location-dependent parameter value that is at least partially based on a physical location of the physical block within the memory and that is to be used in an error decoding operation.

19. The data storage device of claim 11, wherein the second value is a time-dependent parameter value.

20. The data storage device of claim 11, wherein the memory includes a three-dimensional array of memory cells, and further comprising circuitry associated with operation of the three-dimensional array of memory cells.