CN114566203B - Flash rapid detection device and method - Google Patents

Abstract

The invention discloses a fast detection device and method for Flash. The device includes: an error correction module, which identifies error position information when reading and writing data; a timing module, which sends a time enable signal according to a set period interval; a statistics module, Count the error counts of each area according to the error position information, and when the time enable signal and the idle enable signal exist at the same time, locate the area with the largest count as the target area and eliminate the time enable signal and clear the counts of each area; The error detection module backs up the data in the target area and detects the target area after the backup. When the read operation is about to be resumed, the detection is suspended and the backup data is kept, the detection progress is saved, and the next time the idle enable signal appears, continue to check the target area. 1. Detection of the target area that has not been detected until the detection of the current target area is completed and a new target area is obtained for detection, thereby realizing local detection with adjustable frequency and improving detection efficiency.

Description

A fast detection device and method for Flash

technical field

The invention belongs to the field of storage technology, and more specifically relates to a fast detection device and method for Flash.

Background technique

With the development of integrated circuit technology, Flash storage module, as a long-life non-volatile storage module, has the characteristics of small size, large capacity and fast speed. The share of Flash storage module in storage module equipment is increasing year by year.

With the continuous progress of the technology, the density and complexity of the Flash memory module are also increasing, so that the possibility of defects in the Flash memory module is also increasing. The inspection at the factory can correct the obvious defects, and some hidden defects It will appear in frequent erasing and writing, which will cause problems with the stored data. Although multi-layer Flash has high cost performance in terms of storage capacity and price, its reliability is constantly decreasing, which is mainly reflected in the increase in error rate and shortened lifespan after repeated use. If no detection is performed, the error rate will soon reach the upper limit of error correction, thereby affecting the normal operation of the storage module and degrading the performance of the storage module. Most of the current detection technologies are comprehensive detection. This method will occupy a large amount of resources of the storage module after leaving the factory, and the detection efficiency is not high.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the present invention provides a fast detection device and method for Flash, the purpose of which is to improve the detection efficiency.

In order to achieve the above object, according to one aspect of the present invention, a kind of fast detection device of Flash is provided, comprising:

An error correction module is used to identify the error position information of the transmitted information during data reading and writing;

A timing module is used for timing and sending a time enable signal according to a set cycle interval;

The statistical module is used to count the error counts of each area according to the error position information fed back by the error correction module, and when the time enable signal and the idle enable signal indicating that the Flash data reading stops exist at the same time, compare the counts of each area, and After the area with the maximum count is sent to the error detection module as the target area, the time enable signal is eliminated and the counts of each area are cleared;

The error detection module is used for backing up the data of the target area and detecting the target area after the backup when an idle enable signal occurs, and when the Flash data read operation is about to be performed, the detection is suspended and the backup data is retained, the detection progress is saved, and When the idle enable signal appears next time, continue to detect the target area that has not been detected until the detection of the current target area is completed and obtain a new target area for detection.

In one of the embodiments, the statistics module includes an address calculation module, an error count registration module and a maximum value detection module, wherein,

The address calculation module is used to calculate the address where the error occurs according to the error location information err_info, and transmit the address to the error count registration module through the addr_num information;

The error count registration module is used to receive the addr_num information and increase the count of the corresponding address area after receiving the addr_num information each time;

The maximum value detection module is used to obtain the time enable signal and the idle enable signal, and when the time enable signal and the idle enable signal exist at the same time, compare the error counts of each area, and send the area with the maximum count as the target area to the error detection module, and at the same time, the time enable signal is eliminated and the counts of each area in the error count register are cleared.

In one of the embodiments, the error detection module returns a dect_end signal to the maximum value detection module after the detection of the current target area is completed, and the maximum value detection module determines whether the dect_end signal is received after sending the previous target area, If received, then select the next target area and continue to send, if not received, then do not work.

In one of the embodiments, the error correction module includes a BCH decoder, and the BCH decoder includes a syndrome calculation module, an error polynomial calculation module and a money search module, wherein,

The syndrome calculation module identifies an error in data transmission and sends an err_en enable signal when an error occurs;

The money search module calculates the error position in turn and sends a corresponding err_info information whenever an error position is obtained, and each err_info information includes the position where the corresponding error occurs;

The statistics module starts statistics after receiving the err_en enable signal and accumulates the error counts in the corresponding area according to the err_info information.

In one of the embodiments, the information format entering the error correction module includes data code, check code, error identification bit and error information, and the error information in the information format is the same as the length of the data code; the error correction module is used to identify the data When there is an error in reading, an error flag is generated at the error flag, and the level of the corresponding position in the error information is flipped; the error correction module is also used to intercept the check code, error flag, and error information after error correction. Send the err_en enable signal when the error is identified, and send the intercepted error information to the statistics module through the err_info information;

The statistics module starts statistics after receiving the err_en enable signal and accumulates the error counts in the corresponding area according to the err_info information.

In one of the embodiments, the error information entering the error correction module is all 0 characters, and the position of each character in the error information is the same as the position of the corresponding character in the data code. When there is a character 1 in the error information intercepted by the error correction module, it means There is an error in the data code at the current position.

In one of the embodiments, the error detection module includes a backup area, and the backup area includes a backup data area, a block information area with an external interface, and a detection progress area with an external structure.

The error detection module is used to save the received address of the target area and the detected error count data information of the target area in the block information area, and the block information area is transmitted through a corresponding external interface error meter data information;

The detection progress area is used to save the detection algorithm, the external interface of the detection progress area is used to modify the internal detection algorithm, and the error detection module is used to backup the data in the target area to the backup data area and then call The detection algorithm in the detection progress area detects the target area, and saves the detection progress in the detection progress area when the detection is interrupted, so as to resume detection according to the detection progress in the next detection.

In one of the embodiments, the timing module includes a page area timing submodule and a sector timing submodule, the time enable signal includes a page area enable signal and a sector enable signal, and the page area timing submodule It is used to send a page area enable signal according to a page area cycle interval, and the sector timing submodule is used to send a sector enable signal according to a sector cycle interval, wherein the sector cycle interval is greater than the page area cycle interval;

When only the page area enable signal occurs, the sector continues to count, and the page area with the largest error count is used as the target area, and the count of the page area is cleared and the page area enable signal is eliminated;

When the sector enable signal occurs, the sector with the largest error count is taken as the target area, and the counts of the sector and the page area are cleared and the page area enable signal and the sector enable signal are eliminated at the same time.

According to another aspect of the present invention, a kind of fast detection method of Flash is provided, comprising:

Set the cycle interval, time and send a time enable signal according to the set cycle interval;

Obtain the error position information of the transmitted information when the data is read and written during the timing period;

According to the error location information, the error counts of each area are counted, and when the time enable signal and the idle enable signal indicating that the Flash data reading stops exist at the same time, the counts of each area are compared, and the area with the largest count is used as the target After the area, the time enable signal is eliminated and the count of each area is cleared;

When the idle enable signal appears, the data in the target area is backed up and the target area is detected after the backup. When the Flash data read operation is about to be performed, the detection is suspended and the backup data is kept, the detection progress is saved, and the next time the idle enable occurs When the signal is signaled, continue to detect the last target area that has not been detected until the current target area detection is completed and a new target area is obtained for detection.

In one of these embodiments,

Set the cycle interval, timing and send time enable signal according to the set cycle interval, including:

Set the page area cycle interval and the sector cycle interval, time the page area and the sector separately, once the page area cycle interval is reached, the page area enable signal is sent, and once the sector cycle interval is reached, the sector enable signal is sent;

When the time enable signal and the idle enable signal indicating that the Flash data read stop exist at the same time, compare the counts of each area, and take the area with the largest count as the target area, then cancel the time enable signal and count the counts of each area Clear, including:

When only the page area enable signal occurs, the sector continues to count, and the page area with the largest error count is used as the target area, and the count of the page area is cleared and the page area enable signal is eliminated;

When the sector enable signal occurs, the sector with the largest error count is taken as the target area, and the counts of the sector and the page area are cleared and the page area enable signal and the sector enable signal are eliminated at the same time.

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

This application uses the built-in error correction module of Flash to identify the position information of the error in the read data to accumulate the errors in each area. Through the preset cycle interval, time is counted during the operation of Flash and the time is issued according to the cycle interval. Enable signal, when the time enable signal is received, it indicates that the current cycle has ended and is about to enter the next cycle. At this time, once the idle signal that Flash stops reading is obtained, the error count of each area is compared and the The area with the largest error count is used as the target area for local detection, and the local detection is used to replace the traditional comprehensive detection to improve the detection efficiency.

In the present application, the frequency of error detection can be adjusted by setting the cycle interval. The longer the cycle interval is, the lower the error detection frequency is, and the shorter the cycle interval is, the higher the error detection frequency is. Therefore, the detection frequency can be adjusted according to the performance and state of the Flash. If the data reading error rate of the Flash is large, the detection frequency can be increased to detect problems in time. If the data reading error rate of the Flash is small, the detection frequency can be reduced. Detect frequency to reduce loss. At the same time, in this application, after the current target area is determined, the time enable signal is promptly eliminated and the error count is cleared, and the statistics of the next cycle can be started, and a new target area can be determined and detected to ensure the continuation of the detection cycle.

During the detection process of this application, if the Flash needs to perform data reading and interrupt the error detection process being executed, then keep the backup and save the detection progress, and resume detection according to the detection when the next idle time, avoiding repeated detection of the detected part, Further improve detection efficiency.

Description of drawings

Fig. 1 is the structural block diagram of the fast detection device of the Flash in an embodiment of the present application;

Fig. 2 is the specific structural diagram of the rapid detection device of the Flash in an embodiment of the present application;

FIG. 3 is a timing diagram of a trigger comparison operation in an embodiment of the present application;

Fig. 4 is the information format of the Flash data read in one embodiment of the present application;

Fig. 5 is a schematic diagram of marking an error location by error information in an embodiment of the present application;

Fig. 6 is a flow chart of detecting by setting the information format in an embodiment of the present application;

Fig. 7 is a structural diagram of a backup area in an embodiment of the present application;

FIG. 8 is a flow chart of the steps of the fast detection method for Flash in an embodiment of the present application.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

As shown in Figure 1, the fast detection device of Flash includes an error correction module, a timing module, a statistics module and an error detection module.

Wherein, the error correction module is a built-in module in the Flash, and when reading data from the Flash, the error correction module identifies and corrects errors in the transmission information during data reading. When the Flash stops reading data, the main controller will send an idle enable signal free_en. In this application, the error module transmits the identified error location information err_info to the statistics module during operation.

Wherein, the timing module is used for timing, and sends the time enabling signal time to the statistics module when the set cycle interval is reached, sets the cycle interval as Δt as required, and sends the time enabling signal time every Δt. Specifically, the timing module can be controlled by a program, or can be completed by using a built-in clock circuit.

Among them, the statistical module has two functions of accumulation and comparison. Accumulation is to count the error counts of each area according to the error location information err_info. When multiple error location information err_info are continuously received, the counts of the corresponding areas are accumulated. When the statistical module receives the time enable signal and the space signal, it starts the comparison operation, that is, when the time enable signal and the idle enable signal indicating that the Flash data reading stops exist at the same time, compare the counts of each area, and use The area with the maximum count is sent to the error detection module as the target area. Then the time enable signal is removed and the counts of each area are cleared, so that the counting of the next cycle and the positioning of the target area can be performed.

Among them, after the error detection module obtains the new target area address, it starts the error detection work in the idle stage of Flash data reading. Specifically, when the idle enable signal free_en occurs, the data in the target area is backed up and the target area is detected after the backup; when the Flash data read operation is about to be performed, the detection is suspended and the backup data is kept, the detection progress is saved, and When the idle enable signal appears next time, continue to detect the target area that has not been detected until the detection of the current target area is completed and obtain a new target area for detection.

This application utilizes the built-in error correction module inside the Flash to identify the location information where errors occur in the read data, so as to accumulate the errors in each area. Through the preset cycle interval, timing is performed during the operation of the Flash and a time enable signal is sent out according to the cycle interval. When the time enable signal is received, it means that the current cycle has ended and the next cycle is about to enter. At this time, once the idle signal for Flash to stop reading is obtained, the error counts of each area are compared and the area with the largest error count is used as the target area for local detection, and local detection is used instead of traditional full detection to improve detection efficiency. In the present application, the frequency of error detection can be adjusted by setting the cycle interval. The longer the cycle interval is, the lower the error detection frequency is, and the shorter the cycle interval is, the higher the error detection frequency is. Therefore, the detection frequency can be adjusted according to the performance and state of the Flash. If the data reading error rate of Flash is high, the detection frequency can be increased to detect problems in time; if the data reading error rate of Flash is low, the detection frequency can be reduced to reduce loss. At the same time, in this application, after the current target area is determined, the time enable signal is promptly eliminated and the error count is cleared, and the statistics of the next cycle can be started, and a new target area can be determined and detected to ensure the continuation of the detection cycle. During the detection process of this application, if the Flash needs to perform data reading and interrupt the error detection process being executed, then keep the backup and save the detection progress, and resume detection according to the detection when the next idle time, avoiding repeated detection of the detected part, Further improve detection efficiency.

In a specific embodiment, when the master controller stops reading data from Flash, it continuously sends out the idle enable signal free_en, and when it is about to resume the data read operation on Flash, it cancels the idle enable signal free_en, so , it can be judged whether it is currently in the read idle state according to whether there is an idle enable signal free_en. In a specific embodiment, after reaching the timing cycle interval, the time enabling signal time sent is a pulse signal, and the time enabling signal time is stored in the statistics module, and when the target area is determined, the time enabling signal time is eliminated, Then, the stored time enable signal time is cleared.

In one embodiment, as shown in Figure 2, the statistics module includes an address calculation module, an error count register module and a maximum value detection module, wherein the error correction module can be a built-in module of Flash, and the address calculation module, error count register The module, the maximum value detection module and the error detection module can be externally expanded fast detection modules.

Wherein, the address error module calculates the address where the error occurs after receiving the error location information err_info fed back by the error correction module, and transmits the address to the error count register module through the addr_num information. It should be noted that the error position in the transmission data acquired by the error correction module is the position in the string of data, and the data read and write in flash is operated on a page-by-page basis. Take the generated initial address for calculation, so as to determine the address information of the page area where the error occurred and the corresponding sector address information, and then transmit the address information addr_num to the error number registration module.

The error count registration module is used to receive the addr_num information and increase the count of the corresponding address area each time the addr_num information is received.

The maximum value detection module is used to perform comparison operations. The conditions for starting work include receiving both the idle enable signal free_en and the time enable signal time. When the two signals exist at the same time, each error number register module is scanned. The error count corresponding to the area address addr_all is compared, and the address corresponding to the maximum error count is recorded as the target area.

Among them, as shown in Figure 3, there are many situations to start the comparison operation:

The first one, such as the detection and counting section 1 in Figure 3, sends the time enable signal time after the end of the first cycle interval, and then receives the idle enable signal free_en after a period of time, and starts the comparison operation at this time. At this time, although there is a certain deviation margin in the actual detection and counting segment compared with the preset cycle interval, the deviation of this time is generally small, and its impact can be ignored.

The second type, such as the detection and counting section 2 in Figure 3, sends the time enable signal time after the end of the second cycle interval, and is already in an idle state at this time, so the comparison operation can be started when the time enable signal time appears.

In the third type, when the time enable signal time and the idle enable signal free_en appear simultaneously, the comparison operation can be started.

In a special case, if multiple zones have the largest error counts at the same time, the zone scanned first will be used as the target zone. After determining the target area, send its address to the error detection module, then cancel the time enable signal time and clear the error count, and restart the statistics and search of the next cycle.

In one embodiment, as shown in Figure 2, after the scanning of the maximum value module, a dect_en signal will be given to the error detection module, and then the address err_addr of the target area will be sent to the error detection module. After the error detection module finishes all detection tasks, It will restore the backup data to the original space, and then send a dect_end signal to the maximum value detection module to indicate that the detection task has ended. After the maximum value detection module sends the last target area, it judges whether the dect_end signal is received, if received, selects the next target area and continues to send, if not received, does not work.

In one embodiment, as shown in FIG. 2, the timing module includes a page area timing submodule and a sector timing submodule, and the time enable signal includes a page area enable signal t1 and a sector enable signal t2. The page area timing sub-module is used to send the page area enable signal t1 according to the page area cycle interval, and the sector timing sub-module is used to send the sector enable signal t2 according to the sector cycle interval, wherein the sector cycle interval is greater than the page area There are multiple page area cycle intervals within one sector cycle interval. When the idle enable signal is present:

When there is only the page area enable signal t1, the sector continues to count, and the page area with the largest error count is used as the target area and the count of the page area is cleared and the page area enable signal is eliminated;

When only the sector enable signal t2 exists, or both the sector enable signal t2 and the page area enable signal t1 exist, the sector with the largest error count is used as the target area and the counts of both the sector and the page area are cleared And eliminate the page area enable signal and the sector enable signal, that is, the priority of sector detection is higher.

In one embodiment, the error correction module includes a BCH decoding module and an error information error correction sub-module, and the BCH decoding module includes a syndrome calculation module, an error polynomial calculation module and a money search module. Wherein, when the syndrome calculation module is started, as long as there is an error in the transmitted data, an err_en enable signal will be given to the error number registration module when the syndrome calculation ends, thereby starting the error number registration module to record the error number. Afterwards, the money search module will calculate the error location in turn, and each time it gets an error location, it will send an err_info message to the address calculation module. err_info includes the location where the error occurred in a string of data. The address calculation module will calculate according to the position where the error occurs and the initial address where the read occurs, so as to determine the address information of the page area where the error occurred and the corresponding sector address information, and then transmit the address information addr_num to the error number register module. The error number registration module receives the address information of the target area, and then increases the count on the corresponding sector and page area registration module.

Common information includes data codes and check codes. In one embodiment, as shown in Figure 4, the information transmission direction is along the direction of the arrow, and error flags and error information are added on the basis of the original information. The error information here is The initial value is a preset information value. During external transmission, only the data code is sent out by Flash, and other information (check code, error flag, error message) will be intercepted internally.

In the error correction process, as shown in Figure 5, the error information is set to be all 0s and equal in length to the original information. When error correction occurs (that is, the level flips 0->1 at the corresponding position), the error information is obtained. The address module only needs to know the first address and scan the position of 1 in the error information to analyze the address of the area where the error occurred. As long as there is a 1 in the content of the error information, it means that there is an error, and the error flag is set.

The specific process is shown in Figure 6. After the system starts, when reading data from Flash, the data after error correction is transmitted according to the above data format, and the detection module will wait for an error flag to appear. If it is not detected, then Do nothing, if an error flag occurs, an err_en enable signal is sent to the error register.

After receiving the err_en signal, the subsequent error location information err_info will be sent to the address calculation module. If the transmission is not over, read the data, check the loop process of the error flag.

In one embodiment, as shown in FIG. 7 , the error detection module includes a backup area, and the backup area includes a block information area, a detection progress area, and a backup data area. Among them, there are external interfaces in the block information area and the detection progress area. The external interface of the block information area mainly transmits the detected error data information, including error address and error type. The external interface of the detection progress area is used to modify the built-in algorithm data.

Firstly, the error detection module will first put the address information of the target area into the block information area in the backup area, then back up the data in the target area to the backup data area, and then detect the target area.

The error detection module will be divided into several different detections according to the detection algorithm, and at the end of each detection, the detection progress will be saved in the detection progress area, and part of the data required for algorithm detection will also be stored in this area. Read the data required for detection in the area.

Each time the error detection module detects an error, it packs the error address and error type into an error data packet and writes it into the block information area.

When the error detection module is working, if the free enable signal free_en signal ends, it means that the Flash memory will resume its working state. At this time, the error detection module will stop working, and restore the data in the backup data area to the original area, and the data saved in the backup area will continue to be retained until the next free_en signal comes. Progress data in the progress area, restore the saved progress, and then continue to detect. After the detection of this area is completed, all error data information will be stored in the block information area.

After the error detection module completes all detection tasks, it will restore the backup data to the original space, and then send a dect_end signal to the maximum value detection module to indicate that the detection task has ended. After the maximum value detection module receives the dect_end signal, it will start a new round of process.

Correspondingly, the present application also relates to a fast detection method for Flash, as shown in FIG. 8 , the fast detection method includes:

Timing: set the cycle interval, time and send a time enable signal according to the set cycle interval;

Information Acquisition: Obtain the error position information of the transmitted information when reading and writing data during the timing period;

Target positioning: count the error counts of each area according to the error position information, and when the time enable signal and the idle enable signal that the Flash data reading stops exist simultaneously, compare the counts of each area, and use the one with the maximum count After the area is used as the target area, the time enable signal is eliminated and the counts of each area are cleared.

Error detection: When the idle enable signal appears, the data in the target area is backed up and the target area is detected after the backup. When the Flash data read operation is about to be performed, the detection is suspended and the backup data is kept, the detection progress is saved and it will appear next time When the enable signal is idle, continue to detect the last target area that has not been detected until the current target area detection is completed and a new target area is obtained for detection.

Specifically, in the timing step, the cycle interval of the page area and the cycle interval of the sector can be set respectively, and the page area and the sector are timed separately. Once the cycle interval of the page area is reached, the page area enable signal t1 is sent. The sector enable signal t2 is sent out at periodic intervals. Correspondingly, in the target positioning step, when only the page area enable signal t1 appears, the sector continues to count, and the page area with the largest error count is used as the target area, and the count of the page area is cleared and the page area enable is eliminated Signal t1; when the sector enable signal t2 appears, take the sector with the largest error count as the target area and simultaneously clear the counts of the sector and the page area and eliminate the page area enable signal t1 and the sector enable signal t2 .

The fast detection method of the Flash corresponds to the fast detection device of the above-mentioned Flash, and the details thereof can be referred to the introduction above, and will not be repeated here.

This application utilizes the built-in error correction module inside the Flash to identify the location information where errors occur in the read data, so as to accumulate the errors in each area. Through the preset cycle interval, timing is performed during the operation of the Flash and a time enable signal is sent out according to the cycle interval. When the time enable signal is received, it means that the current cycle has ended and the next cycle is about to enter. At this time, once the idle signal for Flash to stop reading is obtained, the error counts of each area are compared and the area with the largest error count is used as the target area for partial detection to avoid comprehensive detection of the Flash memory module and through targeted detection The detection frequency is reduced, the detection efficiency and the utilization rate of the controller are improved, and the service life of the Flash memory is improved at the same time. In the present application, the frequency of error detection can be adjusted by setting the cycle interval. The longer the cycle interval is, the lower the error detection frequency is, and the shorter the cycle interval is, the higher the error detection frequency is. Therefore, the detection frequency can be adjusted according to the performance and state of the Flash. If the data reading error rate of Flash is high, the detection frequency can be increased to detect problems in time; if the data reading error rate of Flash is low, the detection frequency can be reduced to reduce loss. At the same time, in this application, after the current target area is determined, the time enable signal is promptly eliminated and the error count is cleared, and the statistics of the next cycle can be started, and a new target area can be determined and detected to ensure the continuation of the detection cycle. During the detection process of this application, if the Flash needs to perform data reading and interrupt the error detection process being executed, then keep the backup and save the detection progress, and resume detection according to the detection when the next idle time, avoiding repeated detection of the detected part, Further improve detection efficiency.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (10)

1. a fast detection device of Flash, is characterized in that, comprises: An error correction module is used to identify the error position information of the transmitted information during data reading and writing; A timing module is used for timing and sending a time enable signal according to a set cycle interval; The statistical module is used to count the error counts of each area according to the error position information fed back by the error correction module, and when the time enable signal and the idle enable signal indicating that the Flash data reading stops exist at the same time, compare the counts of each area, and After the area with the maximum count is sent to the error detection module as the target area, the time enable signal is eliminated and the counts of each area are cleared; The error detection module is used for backing up the data of the target area and detecting the target area after the backup when an idle enable signal occurs, and when the Flash data read operation is about to be performed, the detection is suspended and the backup data is retained, the detection progress is saved, and When the idle enable signal appears next time, continue to detect the target area that has not been detected until the detection of the current target area is completed and obtain a new target area for detection. 2. the fast detection device of Flash as claimed in claim 1, is characterized in that, described statistics module comprises address calculation module, error count registration module and maximum value detection module, wherein, The address calculation module is used to calculate the address where the error occurs according to the error location information err_info, and transmit the address to the error count registration module through the addr_num information; The error count registration module is used to receive the addr_num information and increase the count of the corresponding address area after receiving the addr_num information each time; The maximum value detection module is used to obtain the time enable signal and the idle enable signal, and when the time enable signal and the idle enable signal exist at the same time, compare the error counts of each area, and send the area with the maximum count as the target area to the error detection module, and at the same time, the time enable signal is eliminated and the counts of each area in the error count register are cleared. 3. the fast detection device of Flash as claimed in claim 2, is characterized in that, described error detection module returns dect_end signal to described maximum value detection module after current target region detects, and described maximum value detection module sends up After a target area, judge whether the dect_end signal is received, if received, select the next target area and continue sending, if not received, do not work. 4. the fast detection device of Flash as claimed in claim 1 is characterized in that, described error correction module comprises BCH decoder, and described BCH decoder comprises syndrome calculation module, error polynomial calculation module and money search module ,in, The syndrome calculation module identifies an error in data transmission and sends an err_en enable signal when an error occurs; The money search module calculates the error position in turn and sends a corresponding error position information err_info whenever an error position is obtained, and each error position information err_info includes the position where the corresponding error occurs; The statistics module starts statistics after receiving the err_en enable signal and accumulates the error counts in the corresponding area according to the error location information err_info. 5. the fast detection device of Flash as claimed in claim 1 is characterized in that, the information format that enters error correction module comprises data code, check code, error flag and error information, and the error information and data code in information format The length is the same; the error correction module is used to generate an error flag in the error flag bit when it is recognized that there is an error in the data reading, and the level of the corresponding position in the error information is reversed; the error correction module is also used to intercept the error after error correction Check code, error flag and error information, when an error flag occurs, an err_en enable signal is sent, and the intercepted error information is sent to the statistics module through the error location information err_info; The statistics module starts statistics after receiving the err_en enable signal and accumulates the error counts in the corresponding area according to the error location information err_info. 6. the fast detection device of Flash as claimed in claim 1 is characterized in that, entering error correction module error message is all 0 characters, and the position of each character in the error message is identical with the position of corresponding character in the data code, when error correction There is a character 1 in the error message intercepted by the module, indicating that there is an error in the current position of the data code. 7. the fast detection device of Flash as claimed in claim 1 is characterized in that, described error detection module comprises backup area, and described backup area comprises backup data area, has the block information area of external interface and has external The detection progress area of the structure, where, The error detection module is used to save the received address of the target area and the detected error count data information of the target area in the block information area, and the block information area is transmitted through a corresponding external interface error meter data information; The detection progress area is used to save the detection algorithm, the external interface of the detection progress area is used to modify the internal detection algorithm, and the error detection module is used to backup the data in the target area to the backup data area and then call The detection algorithm in the detection progress area detects the target area, and saves the detection progress in the detection progress area when the detection is interrupted, so as to resume detection according to the detection progress in the next detection. 8. the fast detection device of Flash as claimed in claim 1 is characterized in that, described timing module comprises page area timing submodule and sector timing submodule, and described time enabling signal comprises page area enabling signal and sector The area enable signal, the page area timing submodule is used to send the page area enable signal according to the page area cycle interval, and the sector timing submodule is used to send the sector enable signal according to the sector cycle interval, wherein, the sector The area cycle interval is greater than the page area cycle interval; When only the page area enable signal occurs, the sector continues to count, and the page area with the largest error count is used as the target area, and the count of the page area is cleared and the page area enable signal is eliminated; When the sector enable signal occurs, the sector with the largest error count is taken as the target area, and the counts of the sector and the page area are cleared and the page area enable signal and the sector enable signal are eliminated at the same time. 9. A fast detection method for Flash, comprising: Set the cycle interval, time and send a time enable signal according to the set cycle interval; Obtain the error position information of the transmitted information when the data is read and written during the timing period; According to the error location information, the error counts of each area are counted, and when the time enable signal and the idle enable signal indicating that the Flash data reading stops exist at the same time, the counts of each area are compared, and the area with the largest count is used as the target After the area, the time enable signal is eliminated and the count of each area is cleared; When the idle enable signal appears, the data in the target area is backed up and the target area is detected after the backup. When the Flash data read operation is about to be performed, the detection is suspended and the backup data is kept, the detection progress is saved, and the next time the idle enable occurs When the signal is signaled, continue to detect the last target area that has not been detected until the current target area detection is completed and a new target area is obtained for detection. 10. the fast detection method of Flash as claimed in claim 9 is characterized in that, Set the cycle interval, timing and send time enable signal according to the set cycle interval, including: Set the page area cycle interval and the sector cycle interval, time the page area and the sector separately, once the page area cycle interval is reached, the page area enable signal is sent, and once the sector cycle interval is reached, the sector enable signal is sent; When the time enable signal and the idle enable signal indicating that the Flash data read stop exist at the same time, compare the counts of each area, and take the area with the largest count as the target area, then cancel the time enable signal and count the counts of each area Clear, including: When only the page area enable signal occurs, the sector continues to count, and the page area with the largest error count is used as the target area, and the count of the page area is cleared and the page area enable signal is eliminated; When the sector enable signal occurs, the sector with the largest error count is taken as the target area, and the counts of the sector and the page area are cleared and the page area enable signal and the sector enable signal are eliminated at the same time.

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