CN111443873A - A kind of management method and device of Nand Flash memory - Google Patents

Abstract

The invention relates to the field of storage media, and discloses a management method and device of a Nand Flash memory. The method includes: obtaining the data block position pointed to by the queue entry pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, the queue entry pointer points to the starting data block of the data area, and the queue is dequeued. The pointer points to the end data block of the data area, and the independent backup block is located before the starting data block; according to the position of the data block pointed to by the enqueue pointer, write the data into the corresponding data block; confirm whether the data writing is successful; if the data is written If successful, the enqueue pointer and the dequeue pointer are moved forward by one data block respectively, thereby ensuring the integrity and security of the data.

Description

A kind of management method and device of Nand Flash memory

technical field

The present invention relates to the field of storage media, in particular to a method and device for managing a Nand Flash memory.

Background technique

In equipment applications, a large amount of historical record data (including charging bills, operation records, alarm records, etc.) needs to be saved to facilitate data verification and management by equipment operators.

At present, the types of storage devices in the device mainly include: E2prom and Nand flash; E2prom is an electrically erasable device, which can be programmed repeatedly and quickly, but is expensive and small in capacity, which is not suitable for storing a large amount of recorded data; Nandflash is a non-volatile flash memory device , each programming needs to be erased according to the sector, and then can be programmed, the operation speed is slow, but the price is low and the capacity is large, and it is widely used in the record storage of equipment.

For the data storage of Nand flash, it has the characteristic that block erase must be performed again before writing and writing, which determines that there will be data loss.

The traditional way to deal with this problem is to read out all the block data before erasing, store it in the cache, and wait for the fast erasing. Erasing and copying data can easily cause block damage, which leads to data loss and bad blocks, which can easily lead to data loss, which has great data integrity and security risks.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a management method and device for Nand Flash memory, which can ensure the integrity and security of data, in view of the above technical problems.

In a first aspect, an embodiment of the present invention provides a method for managing a Nand Flash memory, the method comprising:

Obtain the location of the data block pointed to by the queue entry pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, and the queue entry pointer points to the start of the data area data block, the dequeue pointer points to the end data block of the data area, and the independent backup block is located before the start data block;

Write data into the corresponding data block according to the data block position pointed to by the enqueue pointer;

Confirm whether the data writing is successful;

If the data writing is successful, the enqueue pointer and the dequeue pointer are respectively moved forward by one data block.

In some embodiments, the determining whether the data writing is successful includes:

read the data in the data block;

If the read data is consistent with the written data, it is determined that the data writing is successful;

If the read data and the written data are different, it is determined that the data writing fails.

In some embodiments, the method further includes:

If the data writing fails, the enqueue pointer is moved forward by one data block.

In some embodiments, the if data writing fails, the method further includes:

Obtain the address information of the data block whose data writing fails;

The address information is written into the bad block detection table, and the bad block detection table is updated.

In some embodiments, the method further includes:

The latest written data in the data area is queried by using the enqueue pointer.

In some embodiments, the method further includes:

The earliest written data in the data area is queried by using the dequeue pointer.

In some embodiments, the method further includes:

Pre-establishing an enqueue pointer and a dequeue pointer, the enqueue pointer and the dequeue pointer are used for query management;

A bad block detection table is established in advance, and the bad block detection table is used as a check record table of bad blocks.

In a second aspect, an embodiment of the present invention further provides an apparatus for managing a Nand Flash memory, the apparatus comprising:

An acquisition module, configured to acquire the data block position pointed to by the queue entry pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, and the queue entry pointer points to the The starting data block of the data area, the dequeue pointer points to the ending data block of the data area, and the independent backup block is located before the starting data block;

a writing module, for writing data into the corresponding data block according to the data block position pointed to by the queue entry pointer;

Confirmation module, used to confirm whether the data writing is successful;

The moving module is configured to move the queue entry pointer and the queue dequeue pointer forward by one data block respectively if the data writing is successful.

In a third aspect, an embodiment of the present invention also provides an electronic device, including:

at least one processor; and,

a memory communicatively coupled to the at least one processor; wherein,

The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the above-mentioned method for managing a Nand Flash memory.

In a fourth aspect, an embodiment of the present invention further provides a non-volatile computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, when the computer-executable instructions are executed by a processor , causing the processor to execute the above-mentioned method for managing the Nand Flash memory.

Compared with the prior art, the beneficial effects of the present invention are: different from the situation in the prior art, the management method and device of the Nand Flash memory in the embodiment of the present invention, by dividing the Nand Flash memory into a data area and an independent data area. , the data area includes at least one data block, and the independent data area includes at least one independent backup block. By using many continuous data blocks as a block queue, the position of the data block pointed to by the enqueue pointer in the storage area is obtained, and according to the enqueue The position of the data block pointed to by the pointer, write the data into the corresponding data block, and then judge whether the data writing is successful, if the data writing is successful, move the entry pointer and the dequeue pointer forward by one data respectively Block, waiting for the next data write, because each data block is cyclically erased, read and written according to the queue mode, so the number of times of data block erasure is equal, making the probability of a single bad block in Nand Flash memory smaller, which can guarantee Data integrity and security.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are denoted as similar elements, Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation.

1 is a schematic flowchart of a management method of a Nand Flash memory in an embodiment of the present invention;

Fig. 2 is the structural representation of data area and independent data area in one embodiment of the present invention;

3 is a schematic flow chart of determining whether data is written successfully in an embodiment of the present invention;

4 is a schematic structural diagram of a data write failure in an embodiment of the present invention;

5 is a schematic structural diagram of writing address information into a bad block detection table in an embodiment of the present invention;

6 is a schematic structural diagram of performing data search in an embodiment of the present invention;

7 is a schematic structural diagram of a management device of a Nand Flash memory in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a hardware structure of an electronic device in an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that, if there is no conflict, various features in the embodiments of the present invention can be combined with each other, which are all within the protection scope of the present invention. In addition, although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, the modules in the device may be divided differently, or the sequence shown in the flowchart may be performed. or the described steps. Furthermore, the words "first", "second" and "third" used in the present invention do not limit the data and execution order, but only distinguish the same or similar items with basically the same function and effect.

As shown in FIG. 1, an embodiment of the present invention provides a method for managing a Nand Flash memory, the method includes:

Step 102, obtain the data block position pointed to by the queue entry pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, and the queue entry pointer points to the data area The dequeue pointer points to the end data block of the data area, and the independent backup block is located before the start data block.

In the embodiment of the present invention, the Nand Flash memory is managed according to data blocks, so the Nand Flash memory is divided into a data area and an independent data area in advance. As shown in FIG. 2, the data area includes at least one data block, which is independent of The data area includes at least one independent backup block. The data block is used to store data, and the independent backup block is used for backup. Many consecutive data blocks can be used as a block queue. Each data block is cyclically erased according to the queue mode, and read Write, so the data block erase times are equal, so that the probability of a single bad block of the Nand Flash memory is smaller, effectively prolonging the service life of the Nand Flash memory. It can be understood that, in some other embodiments, in addition to the circular queue mode, the present invention may also adopt the queue mode of the linked list data structure.

Since the embodiment of the present invention uses the queue cyclic storage mechanism for data storage, two pointers need to be used, namely the queue entry pointer and the queue dequeue pointer, wherein the queue entry pointer points to the starting data block of the data area, and the queue pointer It points to the end data block of the data area, and the independent backup block is located before the start data block, and the data interval is constantly adjusted dynamically before the enqueue pointer and the dequeue pointer, and the integrity of the data is always maintained.

Step 104: Write data into the corresponding data block according to the position of the data block pointed to by the queue entry pointer.

Specifically, before performing data writing, first perform an erasing operation on the data block pointed to by the queue entry pointer in the storage area, and then write data into the corresponding data block according to the position of the data block pointed to by the queue entry pointer. It should be noted that, in order to make full use of the Nand Flash memory, each time data is written, the size of the written data and the size of the data block should be the same as possible.

Step 106, confirm whether the data writing is successful.

Specifically, after all data is written into the corresponding data block, in order to ensure the integrity of the data, it is necessary to determine whether the written data is correct, that is, to determine whether the data writing is successful.

Step 108, if the data writing is successful, move the queue entry pointer and the queue dequeue pointer forward by one data block respectively.

Specifically, if the data writing is successful, the enqueue pointer automatically jumps to the next data block, waiting for the next data write operation, and at the same time, the dequeue pointer also moves forward by one data block, thus avoiding cyclic erasure The operation of data blocks reduces the risk of bad blocks, thereby extending the life of Nand Flash memory.

In the embodiment of the present invention, by dividing the Nand Flash memory into a data area and an independent data area, the data area includes at least one data block, the independent data area includes at least one independent backup block, and many continuous data blocks are used as a block queue, Obtain the data block position pointed to by the queue entry pointer in the storage area, and write the data into the corresponding data block according to the data block position pointed to by the queue entry pointer, and then judge whether the data writing is successful, if the data writing is successful, Then move the enqueue pointer and the dequeue pointer forward by one data block and wait for the next data write. Since each data block is cyclically erased and read and written according to the queue mode, the data block is erased. The number of divisions is equal, which makes the probability of a single bad block of the NandFlash memory smaller, thereby ensuring the integrity and security of the data.

In some embodiments, as shown in FIG. 3 , the determining whether data writing is successful includes:

Step 302: Read the data in the data block.

Specifically, after the data is all written into the corresponding data block, the data is read from the data block.

Step 304: If the read data is consistent with the written data, it is determined that the data writing is successful.

Specifically, the read data is compared with the written data, and if the read data is consistent with the written data, it means that the data is correct, that is, the data writing is successful.

Step 306, if the read data is different from the written data, it is determined that the data writing fails.

Specifically, the read data is compared with the written data. If the read data is different from the written data, that is, the data writing fails, indicating that the data block is damaged, stop writing to the data block. data input.

In some embodiments, the method further includes moving the enqueue pointer forward by one data block if the data writing fails.

Specifically, as shown in FIG. 4 , if the data writing fails, the queue entry pointer automatically jumps to the next data block, that is, the queue entry pointer moves forward by one data block. Further, input the enqueue pointer as a parameter into the bad block detection table to check whether the data block pointed to by the enqueue pointer is damaged. At the same time, the enqueue pointer automatically jumps to the next data block, and the dequeue pointer moves forward one data block. Through the bad block detection mechanism, even if bad data blocks appear, by adding independent blocks, data loss and errors will not occur due to bad blocks, thus ensuring data integrity and security.

In some embodiments, if the data writing fails, in addition to moving the queue pointer forward by one data block, the method further includes: acquiring address information of the data block for which the data writing fails, The address information is written into the bad block detection table, and the bad block detection table is updated.

Exemplarily, as shown in FIG. 5, data is written into the data block 8, if the data writing fails, the address information of the data block 8 is obtained, and then the address information of the data block 8 is written into the bad block detection table. , and update the bad block detection table.

In some embodiments, the method further includes: using the enqueue pointer to query the latest written data in the data area, and using the dequeue pointer to query the earliest written data in the data area.

Specifically, as shown in FIG. 6 , when searching for data, it is possible to efficiently search for data by using double pointers. If you want to find the latest data, use the enqueue pointer as a parameter to find the latest data block in the data area, and then get the latest written data. Similarly, if you want to find the earliest written data, you can dequeue the data by dequeuing The pointer is used as a parameter to find the oldest data block in the data area, so as to get the earliest written data.

In some embodiments, the method further includes: pre-establishing an enqueue pointer and a dequeue pointer, the enqueue pointer and the dequeue pointer are used for query management; pre-establishing a bad block detection table, the bad block detection The table is used as a check record table for bad blocks.

Correspondingly, an embodiment of the present invention also provides an apparatus for managing a Nand Flash memory. As shown in FIG. 7 , the apparatus 700 includes:

The obtaining module 702 is configured to obtain the data block position pointed to by the queue entry pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, and the queue entry pointer points to the data block. The starting data block of the data area, the dequeue pointer points to the ending data block of the data area, and the independent backup block is located before the starting data block;

Writing module 704, for writing data into the corresponding data block according to the data block position pointed to by the queue entry pointer;

A determination module 706, configured to confirm whether the data writing is successful;

The moving module 708 is configured to move the enqueue pointer and the dequeue pointer forward by one data block respectively if the data writing is successful.

The management device of the Nand Flash memory provided by the embodiment of the present invention obtains the data block position pointed to by the queue entry pointer in the storage area through an acquisition module, and then writes the data according to the data block position pointed to by the queue entry pointer through the writing module. In the corresponding data block, the determination module determines whether the data writing is successful. If the data writing is successful, the moving module moves the entry pointer and the dequeue pointer forward by one data block, thereby ensuring the security of the data. sex and integrity.

Optionally, in other embodiments of the apparatus, as shown in FIG. 7 , the apparatus 700 further includes:

a query module 710, configured to query the latest written data in the data area by using the queue entry pointer;

The earliest written data in the data area is queried by using the dequeue pointer.

Optionally, in other embodiments of the apparatus, as shown in FIG. 7 , the apparatus 700 further includes:

The establishment module 712 is used for pre-establishing the enqueue pointer and the dequeue pointer, and the enqueue pointer and the dequeue pointer are used for query management;

A bad block detection table is established in advance, and the bad block detection table is used as a check record table of bad blocks.

Optionally, in other embodiments of the apparatus, the obtaining module 702 is specifically configured to:

Acquire address information of the data block whose data writing fails.

Optionally, in other embodiments of the apparatus, the writing module 704 is specifically configured to:

The address information is written into the bad block detection table, and the bad block detection table is updated.

Optionally, in other embodiments of the apparatus, the determining module 706 is specifically configured to:

read the data in the data block;

If the read data is consistent with the written data, it is determined that the data writing is successful;

If the read data and the written data are different, it is determined that the data writing fails.

Optionally, in other embodiments of the apparatus, the moving module 708 is specifically configured to:

If the data writing fails, the enqueue pointer is moved forward by one data block.

It should be noted that the above-mentioned Nand Flash memory management device can execute the Nand Flash memory management method provided by the embodiment of the present invention, and has corresponding functional modules and beneficial effects of the execution method, which are not detailed in the embodiment of the Nand Flash memory management device. For the technical details described, reference may be made to the management method of the NandFlash memory provided by the embodiment of the present invention.

FIG. 8 is a schematic diagram of a hardware structure of an electronic device provided by an embodiment of the present invention. As shown in FIG. 8 , the electronic device 800 includes:

One or more processors 802 and memory 804, one processor 802 is taken as an example in FIG. 8 .

The processor 802 and the memory 804 may be connected by a bus or in other ways, and the connection by a bus is taken as an example in FIG. 8 .

The memory 804, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs and modules, such as corresponding to the management method of the Nand Flash memory in the embodiment of the present invention. program instructions/modules (eg, acquisition module 702, write module 704, determination module 706, move module 708, query module 710, and establishment module 712 shown in FIG. 7). The processor 802 executes various functional applications and data processing of the electronic device by running the non-volatile software programs, instructions and modules stored in the memory 804, that is, the management method of the Nand Flash memory of the above method embodiments is implemented.

The memory 804 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the management device of the Nand Flash memory, and the like. Additionally, memory 804 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 804 may optionally include memory located remotely from the processor 802, and these remote memories may be connected via a network to the means of management of the Nand Flash memory. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The one or more modules are stored in the memory 804, and when executed by the one or more electronic devices 800, execute the management method of the Nand Flash memory in any of the above method embodiments, for example, execute the above-described method. The method steps 102 to 108 in FIG. 1 and the method steps 302 to 306 in FIG. 3 implement the functions of the modules 702 to 712 in FIG. 7 .

The electronic devices in the embodiments of the present invention exist in various forms, including but not limited to:

(1) Mobile communication equipment: This type of equipment is characterized by having mobile communication functions, and its main goal is to provide voice and data communication. Such terminals include: smart phones (eg iPhone), multimedia phones, feature phones, and low-end phones.

(2) Ultra-mobile personal computer equipment: This type of equipment belongs to the category of personal computers, has computing and processing functions, and generally has the characteristics of mobile Internet access. Such terminals include: PDAs, MIDs, and UMPC devices, such as iPads.

(3) Portable entertainment equipment: This type of equipment can display and play multimedia content. Such devices include: audio and video players (eg iPod), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

From the description of the above embodiments, those of ordinary skill in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, and certainly can also be implemented by hardware. Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and the program is During execution, it may include the processes of the embodiments of the above-mentioned methods. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, The steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been The skilled person should understand that it is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the implementation of the present invention. scope of technical solutions.

Claims (10)

1. a management method of Nand Flash memory, is characterized in that, described method comprises: Obtain the location of the data block pointed to by the queue entry pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, and the queue entry pointer points to the start of the data area data block, the dequeue pointer points to the end data block of the data area, and the independent backup block is located before the start data block; Write data into the corresponding data block according to the data block position pointed to by the enqueue pointer; Confirm whether the data writing is successful; If the data writing is successful, the enqueue pointer and the dequeue pointer are respectively moved forward by one data block. 2. The method according to claim 1, wherein the determining whether the data writing is successful comprises: read the data in the data block; If the read data is consistent with the written data, it is determined that the data writing is successful; If the read data and the written data are different, it is determined that the data writing fails. 3. The method according to claim 1 or 2, wherein the method further comprises: If the data writing fails, the enqueue pointer is moved forward by one data block. 4. The method according to claim 3, wherein if the data writing fails, the method further comprises: Obtain the address information of the data block whose data writing fails; The address information is written into the bad block detection table, and the bad block detection table is updated. 5. The method according to claim 4, wherein the method further comprises: The latest written data in the data area is queried by using the enqueue pointer. 6. The method according to claim 5, wherein the method further comprises: The earliest written data in the data area is queried by using the dequeue pointer. 7. The method according to claim 6, wherein the method further comprises: Pre-establishing an enqueue pointer and a dequeue pointer, the enqueue pointer and the dequeue pointer are used for query management; A bad block detection table is established in advance, and the bad block detection table is used as a check record table of bad blocks. 8. a management device of Nand Flash memory, is characterized in that, described device comprises: The acquiring module is configured to acquire the position of the data block pointed to by the enqueue pointer in the storage area, wherein the storage area includes a data area and an independent backup block, the data area includes at least one data block, and the enqueue pointer points to the The starting data block of the data area, the dequeue pointer points to the ending data block of the data area, and the independent backup block is located before the starting data block; a writing module, for writing data into the corresponding data block according to the data block position pointed to by the queue entry pointer; Confirmation module, used to confirm whether the data writing is successful; The moving module is configured to move the queue entry pointer and the queue dequeue pointer forward by one data block respectively if the data writing is successful. 9. An electronic device, characterized in that, comprising: at least one processor; and, a memory communicatively coupled to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the execution of any of claims 1-7 method. 10. A non-volatile computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions that, when executed by a processor, cause the processing The controller performs the method of any one of claims 1-7.

Images