Split data error correction code circuits

• US 8,792,277 B2
• Filed: 09/16/2013
• Issued: 07/29/2014
• Est. Priority Date: 06/24/2003
• Status: Active Grant

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Micron Technology, Inc.
• Inventors: Eggleston, David, Moschopoulos, Anthony, Murray, Michael, Keays, Brady L.
• Primary Examiner(s): Luu, Pho M
• Application Number:
  US14/027,381
• Publication Number:
  US 20140019826A1
• Time in Patent Office: 316 Days
• Field of Search: 365/185.09, 365/185.11, 365/185.05
• US Class Current: 365/185.09
• CPC Class Codes: G06F 11/1008 in individual solid state devices G06F11/1004 takes precedence
• CPC Class Codes: G06F 11/1068 in sector programmable memories, e.g. flash disk G06F11/1072 takes precedence
• CPC Class Codes: G11C 16/16 for erasing blocks, e.g. arrays, words, groups

Abstract

Split data error correction code (ECC) circuits including a control circuit coupled to an error correction code (ECC) circuit. The ECC circuit is adapted to generate at least one ECC code from user data of a first physical sector during a data access. The split data ECC circuit is adapted to write the at least one ECC code to a second physical sector if the data access is a write access and to compare the at least one generated ECC code with at least one ECC code stored in a second physical sector if the data access is a read access.

Claims

1. A split data error correction code (ECC) circuit comprising:

a control circuit coupled to an error correction code (ECC) circuit; and

wherein the ECC circuit is adapted to generate at least one ECC code from user data of a first physical sector during a data access, and where the split data ECC circuit is adapted to write the at least one ECC code to a second physical sector if the data access is a write access and to compare the at least one generated ECC code with at least one ECC code stored in a second physical sector if the data access is a read access.

2. The split data ECC circuit of claim 1, wherein first and second physical sectors contain multiple logical sectors and ECC code data areas, and wherein the split data ECC circuit is adapted to generate an ECC code for each accessed logical sector of the first physical sector.

3. The split data ECC circuit of claim 1, wherein the data access is a sequential access that progresses from the first physical sector to the second physical sector.

4. The split data ECC circuit of claim 1, wherein the split data ECC circuit further comprises:

a RAM storage circuit coupled to the control circuit and the ECC circuit, wherein the split data ECC circuit is adapted to store the at least one generated ECC code in the RAM storage unit.

5. The split data ECC circuit of claim 1, wherein the first and second physical sectors are from differing erase blocks of a superblock.

6. The split data ECC circuit of claim 1, wherein the ECC circuit is adapted to generate and compare ECC data codes to detect data errors during a data read access.

7. The split data ECC circuit of claim 6, wherein the ECC circuit is adapted to correct user data during a data read access.

8. The split data ECC circuit of claim 1, wherein the first physical sector is addressed as physical sector m and where the second physical sector is addressed as physical sector m−

1.

9. The split data ECC circuit of claim 1, wherein the first physical sector is addressed as physical sector m and where the second physical sector is addressed as physical sector m+1.

10. The split data ECC circuit of claim 1, wherein the first physical sector is a final physical sector and where the second physical sector is an initial physical sector of an erase block.

11. A split data error correction code (ECC) circuit comprising:

a storage circuit;

an error correction code (ECC) circuit coupled to the storage circuit; and

a control circuit coupled to the ECC circuit and coupled to the storage circuit;

wherein the ECC circuit is adapted to generate at least one ECC code from user data of a first physical sector during a write access of the first physical sector and to write the at least one ECC code to the storage circuit; and

wherein the split data ECC circuit is adapted to write the at least one ECC code from the storage circuit to a second physical sector during a write access of the second physical sector.

12. The split data ECC circuit of claim 11, further comprising:

wherein the ECC circuit is adapted to generate at least one second ECC code from user data of the second physical sector during the write access of the second physical sector and to write the at least one second ECC code to the storage circuit; and

wherein the split data ECC circuit is adapted to write the at least one second ECC code from the storage circuit to a third physical sector during a write access of the third physical sector.

13. The split data ECC circuit of claim 12, wherein the second physical sector is a next sequentially addressed physical sector from the first physical sector, and wherein the third physical sector is a next sequentially addressed physical sector from the second physical sector.

14. The split data ECC circuit of claim 11, further comprising:

wherein the ECC circuit is adapted to generate at least one second ECC code from user data of the second physical sector during a subsequent write access of the second physical sector and to write the at least one second ECC code to the storage circuit; and

wherein the split data ECC circuit is adapted to write the at least one second ECC code from the storage circuit to the first physical sector during a subsequent write access of the first physical sector.

15. The split data ECC circuit of claim 11, wherein the write access of the first physical sector and the write access of the second physical sector are part of a sequential write access that progresses from the first physical sector to the second physical sector.

16. A split data error correction code (ECC) circuit comprising:

a storage circuit;

an error correction code (ECC) circuit coupled to the storage circuit; and

a control circuit coupled to the ECC circuit and coupled to the storage circuit;

wherein the ECC circuit is adapted to generate at least one ECC code from user data of a first physical sector during a read access of the first physical sector and to write the at least one ECC code to the storage circuit; and

wherein the split data ECC circuit is adapted to read stored ECC data from a second physical sector during a read access of the second physical sector, and to compare the at least one ECC code to the stored ECC data from the second physical sector to detect data errors in the user data of the first physical sector.

17. The split data ECC circuit of claim 16, wherein the second physical sector is a next sequentially addressed physical sector from the first physical sector.

18. The split data ECC circuit of claim 16, further comprising:

wherein the ECC circuit is adapted to generate at least one second ECC code from user data of the second physical sector during the read access of the second physical sector and to write the at least one second ECC code to the storage circuit; and

wherein the split data ECC circuit is adapted to read stored ECC data from a third physical sector during a read access of the third physical sector, and to compare the at least one second ECC code to the stored ECC data from the third physical sector to detect data errors in the user data of the second physical sector.

19. The split data ECC circuit of claim 16, wherein the write access of the first physical sector and the write access of the second physical sector are part of a sequential write access that progresses from the first physical sector to the second physical sector.

20. The split data ECC circuit of claim 16, further comprising:

wherein the ECC circuit is adapted to generate at least one second ECC code from user data of the second physical sector during a subsequent read access of the second physical sector and to write the at least one second ECC code to the storage circuit; and

wherein the split data ECC circuit is adapted to read stored ECC data from the first physical sector during a subsequent read access of the first physical sector, and to compare the at least one second ECC code to the stored ECC data from the first physical sector to detect data errors in the user data of the second physical sector.