CN107765997A

CN107765997A - A kind of method of solid state hard disc write-in data scrambling

Info

Publication number: CN107765997A
Application number: CN201710913796.3A
Authority: CN
Inventors: 伦建坤; 郭超
Original assignee: Ramaxel Technology Shenzhen Co Ltd
Current assignee: Ramaxel Technology Shenzhen Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2018-03-06
Anticipated expiration: 2037-09-30
Also published as: CN107765997B

Abstract

The invention discloses a kind of method of solid state hard disc write-in data scrambling, it is characterized in that the scrambler seed that Remap Ofst information acquisition matches is offset according to erasable the number PE cycle and scrambler seed table of write-in page address Page Addr of data, page ISN word address Necc Addr, write-in block, scrambler calculates the scrambler for obtaining write-in data according to the scrambler seed of acquisition, and the scrambling to writing data is realized according to the scrambler of acquisition.The present invention is associated with the erasable number of the page address of data to be written, page ISN word address and write-in block by that will scramble, and the randomness for substantially increasing data ensure that in page that data do not have correlation, data do not have same memory cell in correlation and block not have correlation in the data of different erasable numbers between page in block.

Description

A kind of method of solid state hard disc write-in data scrambling

Technical field

The present invention relates to solid state hard disc control technology, more particularly to a kind of method of solid state hard disc write-in data scrambling.

Background technology

Flash memory applies voltage come data storage by control gate, very sensitive to the Data Styles of some write-ins, constantly defeated Enter all ones or all zeroes, it is easy to cause flash memory internal electricity unbalanced, so as to cause signal anti-interference to decline, cause these data Less reliable in a flash memory.Therefore the data for needing NAND controller NandFlash Controller to write user add Scrambler, the data 0 and 1 of final write-in flash memory is kept in balance substantially, reduce the probability that bit reversal occurs for data.With partly leading The progress of body technology and the increase of the single memory cell capacity of flash memory, the randomness for writing data in flash memory use the longevity to flash memory The influence of life is all the more obvious, so it has to be ensured that the randomness of data.

In terms of flash memory particle is mainly reflected in three to the randomness requirement for writing data, 1:Data are without correlation in page Property；2：Data do not have correlation between page in block；3：Same memory cell data under different PE cycle do not have correlation in block. Fig. 1 is that data do not have correlation requirement schematic diagram in page；Fig. 2 is that data do not have correlation requirement schematic diagram between page in block；Fig. 3 is Same memory cell data under different PE cycle do not have correlation requirement schematic diagram in block；Each circle represents that an access is single Member, there is no correlation between data in filled circles in each figure.Therefore it is required that the scrambler added must be simultaneously achieved the above three Individual aspect without correlation, just can guarantee that the randomness of data.

The content of the invention

For disadvantages described above, the present invention seeks to how to improve and ensure the randomness of data after scrambling.

A kind of method of solid state hard disc write-in data scrambling is proposed in order to solve the problem above present invention, it is characterised in that According to write-in page address Page Addr of data, page ISN word address Necc Addr, write-in block erasable number PE cycle With the scrambler seed of scrambler seed table skew Remap Ofst information acquisition matching, scrambler is according to the scrambler seed meter of acquisition The scrambler for obtaining write-in data is calculated, the scrambling to writing data is realized according to the scrambler of acquisition.

The method of described solid state hard disc write-in data scrambling, it is characterised in that scrambler seed table skew Remap Ofst are pressed Obtained according to following method：Remap Ofst=floor (Page Addr/1).

The method of described solid state hard disc write-in data scrambling, it is characterised in that scrambler seed corresponding to write-in data passes through Scrambler seed call number index inquiry scrambler seed tables are obtained, and scrambler seed call number index is prepared by the following： Index=mod (Page Addr × 4+Necc Addr+Remap Ofst+PE cycle, 32).

The method of described solid state hard disc write-in data scrambling, it is characterised in that realize presently written number in accordance with the following steps According to scrambling：

Step 1：The page address Page of the address information acquisition write-in data of write-in is actually subjected to according to presently written data Addr, page ISN word address Necc Addr and write-in block erasable number PE cycle；

Step 2：Calculated according to Remap Ofst=floor (Page Addr/1) and obtain scrambler seed table skew Remap Ofst；

Step 3：According to Index=mod (Page Addr × 4+Necc Addr+Remap Ofst+PE cycle, 32) meters Calculate and obtain scrambler seed call number index；

Step 4：According to the scrambler seed call number index of acquisition, inquiry scrambler seed table obtains scrambler seed；

Step 5：Scrambler scrambles according to the scrambler seed of acquisition to the write-in data of input.

The method of solid state hard disc write-in data scrambling, it is characterised in that Page Addr of step 1, page inner code word The erasable number PE cycle of location Necc Addr and write-in block by software according to write-in data address information obtain, step 2 to 5 are all performed automatically by hardware.

The present invention is by will scramble erasable number phase with the page address of data to be written, page ISN word address and write-in block Association, substantially increase data randomness ensure that in page data there is no correlation, in block between page data do not have correlation and Same memory cell does not have correlation in the data of different erasable numbers in block.

Brief description of the drawings

Fig. 1 is that data do not have correlation requirement schematic diagram in page；

Fig. 2 is that data do not have correlation requirement schematic diagram between page in block；

Fig. 3 is that same memory cell data under different PE cycle do not have correlation requirement schematic diagram in block；

Fig. 4 is the implementation method structured flowchart of hardware Seed scramblings；

Fig. 5 is the effect diagram of hardware Seed scramblings.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.

In many data transfers, even 0 sequence for connecting 1 is considered as that unstable signal avoids, it is necessary to try one's best, and is then scrambled It is widely used in this occasion.In terms of flash memory particle is mainly reflected in three to the randomness requirement for writing data, 1:In page Data do not have correlation；2：Data do not have correlation between page in block；3：Same memory cell number under different PE cycle in block According to no correlation.

Fig. 4 is the implementation method structured flowchart of hardware Seed scramblings；Wherein Page Addr represent page address, Necc Addr Page ISN word address is represented, PE cycle represent the erasable number of block, and Remap Ofst represent Seed Table start offset. By Page Addr, Necc Addr, PE cycle, Remap Ofst carry out computing so as to ensure to select according to the rule of setting The Scrb seed taken are different in some cycles.

First, to there is 4 code words in each page, every 1 page, Remap_ofset, which adds in 1, Seed Table, 32 Exemplified by individual Seed, the detailed step of Hard Seed scrambling schemes is provided：

Step 5：Scrambler scrambles according to the scrambler seed of acquisition to the write-in data of input, due to scrambler seed It is associated with erasable number PE cycle to calculate acquisition, ensure that same memory cell is under different PE cycle in block, data There is no correlation.

Because the calculating acquisition of scrambler seed is associated with page address Page Addr and Remap Ofst, block ensure that Data do not have correlation between interior page；Necc Addr and Seed ensure that data do not have correlation in page.

Fig. 5 is the effect diagram of hardware Seed scramblings, and PE cycle ensure that same memory cell is in different PE in block Under cycle, data do not have correlation, i.e., shown in Fig. 3；Page Addr and Remap Ofst ensure that data do not have between page in block There is correlation, i.e., shown in Fig. 2；Necc Addr and Seed ensure that data do not have correlation in page, i.e., shown in Fig. 1.

The process of decoding is as the process scrambled, it is ensured that data can correctly be recovered.

The above disclosed interest field for being only an embodiment of the present invention, sheet can not being limited with this certainly, One of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and according to the claims in the present invention institute The equivalent variations of work, still fall within the scope that the present invention is covered.

Claims

A kind of 1. method of solid state hard disc write-in data scrambling, it is characterised in that according to page address Page Addr of write-in data, Page ISN word address Necc Addr, erasable the number PE cycle and scrambler seed table of write-in block offset Remap Ofst letter Breath obtains the scrambler seed of matching, and scrambler calculates the scrambler for obtaining write-in data according to the scrambler seed of acquisition, according to acquisition Scrambler realize to write data scrambling.
2. the method for solid state hard disc write-in data scrambling according to claim 1, it is characterised in that scrambler seed table is offset Remap Ofst are obtained as follows：Remap Ofst=floor (Page Addr/1).
3. the method for solid state hard disc write-in data scrambling according to claim 2, it is characterised in that corresponding to write-in data Scrambler seed is inquired about scrambler seed table by scrambled code call number index and obtained, and scrambler seed call number index passes through with lower section Method obtains：Index=mod (Page Addr × 4+Necc Addr+Remap Ofst+PE cycle, 32).
4. the method for solid state hard disc write-in data scrambling according to claim 3, it is characterised in that real in accordance with the following steps The scrambling of existing presently written data：

Step 1：Page address Page Addr for the address information acquisition write-in data for being actually subjected to write according to presently written data, Page ISN word address Necc Addr and write-in block erasable number PE cycle；

Step 2：Calculated according to Remap Ofst=floor (Page Addr/1) and obtain scrambler seed table skew Remap Ofst；

Step 3：Calculated and obtained according to Index=mod (Page Addr × 4+Necc Addr+Remap Ofst+PE cycle, 32) Obtain scrambler seed call number index；

Step 4：According to the scrambler seed call number index of acquisition, inquiry scrambler seed table obtains scrambler seed；

Step 5：Scrambler scrambles according to the scrambler seed of acquisition to the write-in data of input.
5. the method for solid state hard disc write-in data scrambling according to claim 4, it is characterised in that Page Addr of step 1, The erasable number PE cycle of page ISN word address Necc Addr and write-in block are obtained by software according to the address information of write-in data , step 2 to 5 is all performed automatically by hardware.