Systems and methods for configuring non-volatile memory
Systems and methods are disclosed for configuring a non-volatile memory (“NVM”). In some embodiments, each block of the NVM can include a block table-of-contents (“TOC”), which can be encoded (e.g., run-length encoded) and dynamically-sized. Thus, as user data is being programmed to a block, the size of a block TOC can be concurrently recalculated and increased only if necessary. In some embodiments, the NVM interface can use a weave sequence stored in the context information and at least one weave sequence associated with each page of a block to determine whether to replay across the pages of the block after system boot-up.
1. A system comprising:
a non-volatile memory (“NVM”) comprising a plurality of blocks, wherein each block comprises a block table-of-contents (“TOC”) and a plurality of data pages;
a bus controller operative to communicate with the NVM; and
control circuitry operative to:
receive at least one write command;
select a first block for programming user data associated with the at least one write command;
determine whether an end boundary of a plurality of data pages of the first block is within a pre-determined number of pages from a start boundary of the block TOC of the first block,
in response to determining that the end boundary of the plurality of data pages is within the pre-determined number of pages from the start boundary of the block TOC, determine the first block is full; and
in response to a determination that the first block is full:
select a second block for programming user data associated with the at least one write command, wherein the second block has been erased and contains no user data; and
program user data associated with the at least one write command in the second block.
2. The system of claim 1 , wherein the control circuitry is further operative to program a size of the block TOC to a last page of the block TOC.
3. The system of claim 1 , wherein the control circuitry is further operative to program a start weave sequence and end weave sequence to the block TOC.
4. The system of claim 3 , wherein the control circuitry is further operative to program the start weave sequence to a first page of the block TOC.
5. The system of claim 3 , wherein the control circuitry is further operative to program the end weave sequence to a last page of the block TOC.
6. The system of claim 3 , wherein the start weave sequence is associated with when user data was first programmed to the block.
7. The system of claim 3 , wherein the end weave sequence is associated with when user data was last programmed to the block.
8. The system of claim 1 , wherein the control circuitry is further operative to program at least one of a page type and version to the block TOC.
9. The system of claim 1 , wherein response to determining that the end boundary of the plurality of data pages is not within a pre-determined number of pages from the start boundary of the block TOC of the first block, the control circuitry is operative to continue programming user data associated with the at least one write command to the first block.
10. The system of claim 9 , wherein the control circuitry is operative to:
increase the size of the block TOC in the first block; and
decrease a total size of the data pages of the block by a corresponding amount.
11. A method for programming user data in a non-volatile memory (“NVM”), the NVM comprising a plurality of blocks, a bus controller, and control circuitry, the method comprising:
communicating with the NVM;
receiving at least one write command;
determining whether an end boundary of a plurality of data pages of a first block is within a pre-determined number of pages from a start boundary of a block table of contents (“TOC”) of the first block;
in response to determining that the end boundary of the plurality of data pages is within a pre-determined number of pages from a start boundary of the block TOC, determining that the first block is full; and
in response to a determination that the first block is full:
selecting a second block for programming user data associated with the at least one write command, wherein the second block has been erased and contains no user data; and
programming user data associated with the at least one write command in the second block.
12. The method of claim 11 , further comprising programming a size of the block TOC to a last page of the block TOC.
13. The method of claim 11 , further comprising programming a start weave sequence and end weave sequence to the block TOC.
14. The method of claim 11 , further comprising programming a start weave sequence to a first page of the block TOC.
15. The method of claim 13 , further comprising programming the end weave sequence to a last page of the block TOC.
16. The method of claim 13 , wherein the start weave sequence is associated with when user data was first programmed to the block.
17. The method of claim 13 , wherein the end weave sequence is associated with when user data was last programmed to the block.
18. The method of claim 11 , further comprising programming at least one of a page type and version to the block.
19. The method of claim 11 , further comprising continuing to program user data associated with the at least one write command to the first block in response to determining that the end boundary of a plurality of pages is not within a pre-determined number of pages from the start boundary of the block TOC.
20. The method of claim 11 , wherein the control circuitry increases the size of the block TOC in the first block and decreases a total size of the data pages of the block by a corresponding amount.