CN103678028A - RAM internal storage detection method and device - Google Patents

Abstract

The application provides a RAM memory detection method, comprising: determining that the data in the RAM memory area to be detected is the original code; storing the inverse code generated after inverting the original code into the backup memory area; if the original If there is the same data in the inverse code and the inverse code, it is determined that the data in the original code is physically damaged; otherwise, the inverse code read from the backup memory area is reversed, and the CRC algorithm is used to perform the inverse operation. The data after the inversion operation is checked to generate a backup CRC check code; compare whether the original reference CRC check code corresponding to the original code is consistent with the backup CRC check code; if so, determine the RAM memory to be detected The data line associated with the area is not damaged or the data in the original code has not been tampered with; if not, it is determined that the data line associated with the RAM memory area to be detected is damaged or the data in the original code has been tampered with. Therefore, the present application is able to detect the cause of incorrect data storage.

Description

Method and device for detecting RAM memory

technical field

The present application relates to the field of memory detection, in particular to a RAM memory detection method and device.

Background technique

At present, in order to enhance the anti-interference and error identification capabilities of the single-chip microcomputer, and prevent the data in the RAM (Random Access Memory) of the single-chip microcomputer from being tampered with or lost, it is necessary to detect the data in the RAM memory of the single-chip microcomputer.

At present, the traditional CRC (Cyclical Redundancy Check) algorithm is usually used to judge whether the data storage in the single-chip RAM memory is correct. Although the traditional CRC algorithm can detect whether the data storage in the RAM memory is correct, it cannot detect the cause Reasons for incorrect data storage, such as physical damage to data and damage to the data line of the microcontroller.

It can be seen from the above that the current method for detecting whether the data storage in the single-chip RAM memory is correct has the disadvantage of being unable to detect the cause of incorrect data storage.

Contents of the invention

In order to solve the above technical problems, the embodiment of the present application provides a RAM memory detection method and device to achieve the purpose of detecting physical data damage and associated data line damage. The technical solution is as follows:

A method for detecting RAM memory, comprising:

It is determined that the data in the RAM memory area to be detected is the original code;

storing the inverse code generated after inverting the original code into the backup memory area;

If the same data exists in the original code and the inverse code, it is determined that the data in the original code is physically damaged;

Otherwise, it is determined that there is no physical damage to the data in the original code, and an inverse operation is performed on the inverse code read from the backup memory area, and the CRC algorithm is used to check the inverse data , generate a backup CRC check code;

Compare whether the original reference CRC check code corresponding to the original code is consistent with the backup CRC check code;

If so, determine that the data line associated with the RAM memory area to be detected is not damaged or the data in the original code has not been tampered with;

If not, it is determined that the data line associated with the RAM memory area to be detected is damaged or the data in the original code has been tampered with.

Preferably, the process of performing an inversion operation on the inverse code read from the backup memory area, using a CRC algorithm to verify the data after the inversion operation, and generating a backup CRC check code includes :

Read all the inverted codes in the backup memory area according to the preset detection cycle;

Perform inversion operation on all the inverse codes read, use the CRC algorithm to verify the data after inversion operation, and generate a backup CRC check code.

Preferably, the process of performing an inversion operation on the inverse code read from the backup memory area, using a CRC algorithm to verify the data after the inversion operation, and generating a backup CRC check code includes :

According to the respective preset detection cycles of different data in the RAM memory area to be detected, read the corresponding inverse code from the backup memory area;

Perform an inversion operation on the read corresponding inverse code, use the CRC algorithm to verify the data after the inversion operation, and generate a corresponding backup CRC check code.

Preferably, the CRC algorithm is used to verify the data after the inverse operation, and the process of generating a backup CRC check code includes:

Use the 16-bit CRC algorithm to verify the data after the inversion operation, and generate a backup CRC check code.

Preferably, the CRC algorithm is used to verify the data after the inverse operation, and the process of generating a backup CRC check code includes:

Use the 32-bit CRC algorithm to verify the data after the inversion operation, and generate a backup CRC check code.

A RAM memory detection device, comprising:

A determination unit is used to determine that the data in the RAM memory area to be detected is the original code;

A storage unit, configured to store the inverse code generated after inverting the original code into the backup memory area;

A first determining unit, configured to determine that the data in the original code is physically damaged if the same data exists in the original code and the inverse code;

The first verification unit is used to perform an inversion operation on the inverse code read from the backup memory area if the same data does not exist in the original code and the inverse code, and use the CRC algorithm to perform an inverse operation on the inverse code. The data after the reverse operation is verified to generate a backup CRC check code;

The comparison unit is used to compare whether the original reference CRC check code corresponding to the original code is consistent with the backup CRC check code, if yes, execute the second judgment unit, if not, execute the third judgment unit;

The second judging unit is used to judge that the data line associated with the RAM memory area to be detected is not damaged or the data in the original code has not been tampered with;

The third judging unit is configured to judge that the data line associated with the RAM memory area to be detected is damaged or the data in the original code has been tampered with.

Preferably, the first verification unit includes:

The first reading unit is used to read all the inverted codes in the backup memory area according to a preset detection cycle;

The second verification unit is configured to perform an inversion operation on all the inverse codes read, and use a CRC algorithm to verify the data after the inversion operation to generate a backup CRC check code.

Preferably, the first verification unit includes:

The second reading unit is used to read the corresponding inverse code from the backup memory area according to the respective preset detection cycles of different data in the RAM memory area to be detected;

The third checking unit is used to perform an inversion operation on the read corresponding one's complement code, use a CRC algorithm to check the data after the inversion operation, and generate a corresponding backup CRC check code.

Preferably, the first verification unit includes:

The fourth verification unit is configured to use a 16-bit CRC algorithm to verify the data after the inversion operation, and generate a backup CRC verification code.

Preferably, the first verification unit includes:

The fifth verification unit is configured to use a 32-bit CRC algorithm to verify the reversed data to generate a backup CRC verification code.

Compared with the prior art, the beneficial effects of the present application are:

In this application, it is determined that the data in the RAM memory area to be detected is the original code, and the original code is inverted, and the generated inverse code is stored in the backup memory area. When starting to detect the RAM memory area to be detected, first compare whether the inverse code in the backup memory area and the original code of the RAM memory area to be detected have the same data. If there is the same data, it means that a certain bit of data in the original code is reversed. After the operation, if there is no change, it is judged that the data has been physically damaged, and the data that is the same in the inverted code and the original code is the data that has been physically damaged.

If the same data does not exist in the original code and the inverse code, it means that the data in the original code is not physically damaged, then use the CRC algorithm to generate a backup CRC check code, and compare the original parameter CRC check code corresponding to the original code with the backup CRC check code. , it indicates that the inverse code read from the backup memory area has changed, and it is determined that the data line associated with the RAM memory area to be detected is damaged or the data has been tampered with.

It can be seen that the present application can detect the causes of incorrect data storage, such as physical damage to data, damage to data lines, or tampering of data.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a kind of flowchart of a kind of RAM memory detection method that the application provides;

Fig. 2 is a kind of sub-flow chart of a kind of RAM memory detection method that the present application provides;

FIG. 3 is a schematic structural view of a RAM memory detection device provided by the present application;

FIG. 4 is a schematic structural diagram of a first verification unit provided in the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The application provides a RAM memory detection method, which can determine that the data in the RAM memory area to be detected is the original code; the inverse code generated after the inversion of the original code is stored in the backup memory area; if the original code and There is the same data in the inverse code, and it is determined that the data in the original code is physically damaged; otherwise, the inverse code read from the backup memory area is reversed, and the CRC algorithm is used to invert the The data after the calculation is checked to generate a backup CRC check code; compare whether the original reference CRC check code corresponding to the original code is consistent with the backup CRC check code; if so, determine the location of the RAM memory area to be detected The associated data line is not damaged; if not, it is determined that the data line associated with the RAM memory area to be detected is damaged. The following examples will be used to describe a RAM memory detection method provided by the present application in detail.

an embodiment

Referring to Fig. 1, it shows a kind of flowchart of a kind of RAM memory detection method that the present application provides, can comprise the following steps:

Step S11: Determine that the data in the RAM memory area to be detected is the original code.

In this embodiment, the data in the RAM memory area to be detected is the data read from the external data memory. In this embodiment, the data in the RAM memory area to be detected is used as the original code.

In this embodiment, a storage area is allocated in the RAM memory as a backup memory area of the RAM memory area to be detected, and step S12 is executed after the backup memory area is allocated.

Step S12: storing the inverse code generated by inverting the original code into the backup memory area.

In this embodiment, an inversion operation is performed on the original code to generate an inverse code, and the inverse code is stored in the backup memory area.

Step S13: judging whether the same data exists in the original code and the inverse code.

In this embodiment, whether there is physical damage to the data in the RAM memory area to be detected is detected by judging whether the same data exists in the original code and the inverse code.

If the judging result is that there is the same data in the original code and the inverse code, execute step S14; otherwise, execute step S15.

Step S14: Determine that the data in the original code is physically damaged.

When the judging result is that the same data exists in the original code and the inverse code, it means that when the original code is reversed, a certain bit of data in the original code has not changed, and the data cannot change, indicating that it has been physically damaged.

Among them, the same data in the original code and inverse code is the data that is physically damaged. Through the comparison of the original code and the inverse code, it is possible to detect which bit of data in the original code is physically damaged, that is, to detect the bit error of the data.

Step S15: Determine that there is no physical damage to the data in the original code, and perform an inversion operation on the inverse code read from the backup memory area, and use the CRC algorithm to verify the inverse data check to generate a backup CRC check code.

When the judging result is that the same data does not exist in the original code and the inverse code, it means that the data in the original code is not physically damaged, and it is further verified whether the data line associated with the RAM memory area to be detected is damaged.

Verify whether the data line associated with the RAM memory area to be detected is damaged, perform an inversion operation on the inverse code read from the backup memory area, and use the CRC algorithm to verify the data after the inversion operation , to generate a backup CRC check code.

If the data line associated with the RAM memory area to be tested is not damaged, the inverse code read from the backup memory area, the data after the inverse operation should be the same as the data in the original code, if the RAM memory to be tested If the data line associated with the area is damaged, the inverse code read from the backup memory area will be different from the data in the original code. Because the data line is damaged, the data read from the backup memory area The obtained inverse code has changed.

Step S16: Compare whether the original reference CRC check code corresponding to the original code is consistent with the backup CRC check code.

In this embodiment, on the premise that the data in the original code is not physically damaged, by comparing whether the original parameter CRC check code corresponding to the original code is consistent with the backup CRC check code, it is judged that the RAM memory area to be detected is associated with Whether the data line is damaged or whether the data has been tampered with.

If the comparison result shows that the original parameter CRC check code corresponding to the original code is consistent with the backup CRC check code, it means that the inverse code read from the backup memory area has not changed, and furthermore, it means that the associated data line has no change. damaged, the data is correct, execute step S17, and if the comparison result is that the original parameter CRC check code corresponding to the original code is inconsistent with the backup CRC check code, it means that the inverse code read from the backup memory area has changed , which further indicates that the associated data line is damaged and the data is incorrect, and step S18 is executed.

It should be noted that, in this embodiment, by comparing whether the original reference CRC check code and the backup CRC check code are consistent, the reason for judging whether the data line associated with the RAM memory area to be detected is damaged is that the data line in the RAM memory area to be detected is damaged. The data itself carries a CRC check code, so in order to make detection more convenient, directly obtain the original parameter CRC check code, and perform a CRC operation on the data in the backup memory area.

Step S17: Determine that the data line associated with the RAM memory area to be detected is not damaged or the data in the original code has not been tampered with.

Step S18: Determine that the data line associated with the RAM memory area to be detected is damaged or the data in the original code has been tampered with.

In this application, it is determined that the data in the RAM memory area to be detected is the original code, and the original code is inverted, and the generated inverse code is stored in the backup memory area. When starting to detect the RAM memory area to be detected, first compare whether the inverse code in the backup memory area and the original code of the RAM memory area to be detected have the same data. If there is the same data, it means that a certain bit of data in the original code is reversed. After the operation, if there is no change, it is judged that the data has been physically damaged, and the data that is the same in the inverted code and the original code is the data that has been physically damaged.

If the same data does not exist in the original code and the inverse code, it means that the data in the original code is not physically damaged, then use the CRC algorithm to generate a backup CRC check code, and compare the original parameter CRC check code corresponding to the original code with the backup CRC check code. , it indicates that the inverse code read from the backup memory area has changed, and it is determined that the data line associated with the RAM memory area to be detected is damaged or the data has been tampered with.

It can be seen that the present application can detect the causes of incorrect data storage, such as physical damage to data, damage to data lines, or tampering of data. .

In performing the RAM memory detection method shown in Figure 1, the inverse code read from the backup memory area is carried out, the inverse operation is carried out, and the data after the inversion operation is verified using the CRC algorithm to generate a backup When the CRC check code is used, the detection period can be set in advance, according to the preset detection period, all the inverse codes in the backup memory area are read, and all the inverse codes read are reversed, and the CRC algorithm is used to perform the inverse operation. The data after the inverse operation is verified, and a backup CRC check code is generated, which avoids real-time execution of the inverse code read from the backup memory area, and performs an inversion operation, and uses the CRC algorithm to perform an inversion operation The operation of verifying the final data and generating a backup CRC check code will cause a large amount of read data to run once and occupy more CPU resources, thereby reducing the impact on the operating efficiency of the system where the RAM memory area to be detected is located.

Of course, in order to avoid the situation that a large amount of read data will take up more CPU resources when running once, an implementation as shown in Figure 2 can also be adopted. Read the inverse code, perform the inversion operation, use the CRC algorithm to verify the data after the inversion operation, and generate the specific process of the backup CRC check code, please refer to Figure 2, which shows the application A sub-flow chart of a RAM memory detection method provided may include the following steps:

Step S21: According to the respective preset detection cycles of different data in the RAM memory area to be detected, read the corresponding inverse code from the backup memory area.

Since different data in the RAM memory area to be detected have their own preset detection cycles, according to the respective preset detection cycles of different data in the RAM memory area to be detected, the corresponding inverse code is read from the backup memory area, and it is not necessary to Read all complements.

Wherein, the respective preset detection cycles of different data in the RAM memory area to be detected can be set according to the importance of the data stored in the RAM memory area to be detected.

The more important the data, the shorter the preset detection cycle can be set, and the less important the data, the longer the preset detection cycle can be set.

Step S22: Inverting the read corresponding one's complement code, using the CRC algorithm to check the inverted data, and generating a corresponding backup CRC check code.

According to the respective preset detection cycles of different data in the RAM memory area to be detected, the corresponding inverse code is read from the backup memory area, therefore, when the preset detection cycle of the corresponding data is reached, the data in the backup memory area is The read corresponding one's complement code is reversed, and the CRC algorithm is used to verify the data after the reversed operation, and a backup CRC check code is generated.

Using the implementation shown in Figure 2, compared to reading all the inverse codes in the backup memory area according to the preset detection period, performing inverse operations on the read inverse codes, and using the CRC algorithm to perform the inverse operation The method of verifying the reversed data and generating a backup CRC check code occupies less CPU resources, further reducing the impact on the operating efficiency of the system where the RAM memory area to be detected is located.

In the above method steps, the CRC algorithm is used to verify the data after the inversion operation, and the process of generating a backup CRC check code can be to use a 16-bit CRC algorithm to verify the data after the inversion operation to generate a backup CRC check code.

Of course, the CRC algorithm is used to verify the data after the inversion operation, and the process of generating the backup CRC check code can also be to use the 32-bit CRC algorithm to verify the data after the inversion operation, and generate a backup CRC checksum code.

For the aforementioned method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the application is not limited by the described action sequence, because according to the application, Certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

Corresponding to the above method embodiments, the present application provides a RAM memory detection device, please refer to FIG. 3 , which shows a schematic structural diagram of a RAM memory detection device provided by the present application. The RAM memory detection device It includes: a determination unit 31 , a storage unit 32 , a first determination unit 33 , a first verification unit 34 , a comparison unit 35 , a second determination unit 36 and a third determination unit 37 .

The determination unit 31 is configured to determine that the data in the RAM memory area to be detected is the original code.

The storage unit 32 is configured to store the inverse code generated by inverting the original code into the backup memory area.

The first determination unit 33 is configured to determine that the data in the original code is physically damaged if the same data exists in the original code and the inverse code.

The first checking unit 34 is used to perform an inversion operation on the inverse code read from the backup memory area if the same data does not exist in the original code and the inverse code, and use the CRC algorithm to perform the inverse operation. The data after the inverse operation is checked to generate a backup CRC check code.

In this embodiment, the first checking unit 34 may include: a first reading unit and a second checking unit.

The first reading unit is configured to read all inverted codes in the backup memory area according to a preset detection cycle.

The second verification unit is configured to perform an inversion operation on all the inverse codes read, and use a CRC algorithm to verify the data after the inversion operation to generate a backup CRC check code.

Of course, another structure of the first verification unit 34 can be referred to FIG. 4, which shows a schematic structural diagram of a first verification unit provided by the present application. The first verification unit includes: a second read Fetch unit 41 and third checking unit 42.

The second reading unit 41 is configured to read corresponding inverse codes from the backup memory area according to respective preset detection cycles of different data in the RAM memory area to be detected.

The third checking unit 42 is configured to perform an inversion operation on the read corresponding one's inverse code, use a CRC algorithm to check the inverse data, and generate a corresponding backup CRC check code.

The comparison unit 35 is used to compare whether the original reference CRC check code corresponding to the original code is consistent with the backup CRC check code, if yes, execute the second judgment unit 36, and if not, execute the third judgment unit 37.

The second determining unit 36 is configured to determine that the data line associated with the RAM memory area to be detected is not damaged or that the data in the original code has not been tampered with.

The third judging unit 37 is configured to judge that the data line associated with the RAM memory area to be detected is damaged or the data in the original code has been tampered with.

The first checking unit 34 may include: a fourth checking unit, configured to use a 16-bit CRC algorithm to check the inverted data to generate a backup CRC check code.

Certainly, the first checking unit 34 may also include: a fifth checking unit, configured to use a 32-bit CRC algorithm to check the data after the inversion operation, and generate a backup CRC check code.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device-type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to part of the description of the method embodiments.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present application, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

It can be known from the above description of the implementation manners that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the essence of the technical solution of this application or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present application.

A RAM memory detection method and device provided by this application have been introduced in detail above, and specific examples have been used in this paper to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only used to help understand the application. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. Application Restrictions.

Claims (10)

1. a memory ram detection method, is characterized in that, comprising:

Determine that the data in memory ram to be detected region are true form;

Deposit the radix-minus-one complement that described true form is carried out to generate after negate in archive memory region;

If there is identical data in described true form and described radix-minus-one complement, judge that the data in described true form exist physical damage;

Otherwise, judge that the data in described true form do not exist physical damage, and to the radix-minus-one complement reading, carry out negate computing from described archive memory region, use CRC algorithm to carry out verification to the data of carrying out after negate computing, generate backup CRC check code;

Whether former ginseng CRC check code corresponding to more described true form be consistent with described backup CRC check code;

If so, judge that the associated data line in described memory ram to be detected region is not tampered without the data in damage or described true form;

If not, judge that the associated data line in described memory ram to be detected region damages or described true form in data be tampered.

2. method according to claim 1, is characterized in that, described to the radix-minus-one complement reading from described archive memory region, carry out negate computing, use CRC algorithm to carry out verification to the data of carrying out after negate computing, generate the process of backup CRC check code, comprising:

According to the sense cycle setting in advance, read the whole radix-minus-one complements in described archive memory region;

The whole radix-minus-one complements that read are carried out to negate computing, use CRC algorithm to carry out verification to the data of carrying out after negate computing, generate backup CRC check code.

3. method according to claim 1, is characterized in that, described to the radix-minus-one complement reading from described archive memory region, carry out negate computing, use CRC algorithm to carry out verification to the data of carrying out after negate computing, generate the process of backup CRC check code, comprising:

According to different pieces of information default sense cycle separately in memory ram to be detected region, from described archive memory region, read corresponding radix-minus-one complement;

The corresponding radix-minus-one complement reading is carried out to negate computing, use CRC algorithm to carry out verification to the data of carrying out after negate computing, generate corresponding backup CRC check code.

4. according to the method described in claim 1-3 any one, it is characterized in that, described use CRC algorithm carries out verification to the data of carrying out after negate computing, and the process that generates backup CRC check code comprises:

Use 16 CRC algorithms to carry out verification to the data of carrying out after negate computing, generate backup CRC check code.

5. according to the method described in claim 1-3 any one, it is characterized in that, described use CRC algorithm carries out verification to the data of carrying out after negate computing, and the process that generates backup CRC check code comprises:

Use 32 CRC algorithms to carry out verification to the data of carrying out after negate computing, generate backup CRC check code.

6. a memory ram pick-up unit, is characterized in that, comprising:

Determining unit, for determining that the data in memory ram to be detected region are true form;

Deposit unit in, for depositing the radix-minus-one complement that described true form is carried out to generate after negate in archive memory region;

The first identifying unit, if there is identical data for described true form and described radix-minus-one complement, judges that the data in described true form exist physical damage;

The first verification unit, if there is not identical data for described true form and described radix-minus-one complement, to the radix-minus-one complement reading, carry out negate computing from described archive memory region, use CRC algorithm to carry out verification to the data of carrying out after negate computing, generate backup CRC check code;

Comparing unit, whether consistent with described backup CRC check code for the former ginseng CRC check code that more described true form is corresponding, if so, carry out the second identifying unit, if not, carry out the 3rd identifying unit;

The second identifying unit, for judging that the associated data line in described memory ram to be detected region is not tampered without the data of damage or described true form;

The 3rd identifying unit, for judging that the associated data line in described memory ram to be detected region damages or the data of described true form are tampered.

7. device according to claim 6, is characterized in that, described the first verification unit comprises:

The first reading unit, for the sense cycle according to setting in advance, reads the whole radix-minus-one complements in described archive memory region;

The second verification unit, for the whole radix-minus-one complements that read are carried out to negate computing, is used CRC algorithm to carry out verification to the data of carrying out after negate computing, generates backup CRC check code.

8. device according to claim 6, is characterized in that, described the first verification unit comprises:

The second reading unit for according to memory ram to be detected region different pieces of information default sense cycle separately, reads corresponding radix-minus-one complement from described archive memory region;

The 3rd verification unit, for the corresponding radix-minus-one complement reading is carried out to negate computing, is used CRC algorithm to carry out verification to the data of carrying out after negate computing, generates corresponding backup CRC check code.

9. according to the device described in claim 6-8 any one, it is characterized in that, described the first verification unit comprises:

The 4th verification unit, for using 16 CRC algorithms to carry out verification to the data of carrying out after negate computing, generates backup CRC check code.

10. according to the device described in claim 6-8 any one, it is characterized in that, described the first verification unit comprises:

The 5th verification unit, for using 32 CRC algorithms to carry out verification to the data of carrying out after negate computing, generates backup CRC check code.

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