CN101887750A - Method for storing dynamic data by using Flash memory - Google Patents
Method for storing dynamic data by using Flash memory Download PDFInfo
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- CN101887750A CN101887750A CN2009101069785A CN200910106978A CN101887750A CN 101887750 A CN101887750 A CN 101887750A CN 2009101069785 A CN2009101069785 A CN 2009101069785A CN 200910106978 A CN200910106978 A CN 200910106978A CN 101887750 A CN101887750 A CN 101887750A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000004048 modification Effects 0.000 claims abstract description 8
- 238000012986 modification Methods 0.000 claims abstract description 8
- 238000013500 data storage Methods 0.000 claims description 57
- 230000008569 process Effects 0.000 claims description 25
- 238000013507 mapping Methods 0.000 claims description 18
- 230000006870 function Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000010076 replication Effects 0.000 claims description 3
- 238000013316 zoning Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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Abstract
The invention discloses a method for storing dynamic data by using a Flash memory, which comprises the following steps of: setting at least one block of the Flash memory as a dynamic data storing area; and dividing the dynamic data storing area into a basic information area and a daily record area, wherein the basic information area is used for storing the data before being modified; the daily record area is used for recording a data modification operation log; and the operation log records the modification information of the data content. The method can prolong the service life of the Flash memory and improve the working stability and the safety of the Flash memory.
Description
Technical field
The present invention relates to a kind of date storage method, particularly relate to the method that a kind of Flash of utilization storer carries out dynamic data storage.
Background technology
Information-storing device when Flash and E2PROM are the most frequently used outage of embedded device.Because driving circuit is simple, employed Flash is NOR type Flash basically in embedded system.NOR Flash has the advantage of capacity big (2M-64M), lack (erasable 100,000 times), erasable speed (the about 2s/64K of erasable speed) and will write data and shortcoming such as must wipe earlier slowly serviceable life but also exist.And E2PROM has long service life (erasable 1,000,000 times), the advantage of erasable speed fast (a few tens of milliseconds rank), but capacity less (several K are to tens K) is arranged, the unit capacity price higher shortcoming that compares.
Because Flash and E2PROM physical characteristics have very big-difference, both employed fields are different, and Flash generally is used for program code stored and does not need frequently to wipe data updated (as system's basic configuration information etc.); E2PROM then is used for storing the dynamic data that need frequently wipe, each status information of program when at every turn operating as recording user.In order to simplify circuit design, reduce hardware cost in embedded system, Flash commonly used substitutes E2PROM and stores dynamic data.
When prior art was stored dynamic data with alternative E2PROM, method commonly used was as follows:
From certain block (Block) of Flash, open up a space (being generally 4-16K) and do the dynamic data storage district, and set up the memory mapping of the internal memory of corresponding size as the dynamic data storage district;
In the device initialize process data in dynamic data storage district are read in the memory mapping;
Set up a background task and carry out the wiping and the write operation in dynamic data storage district.
When need are revised certain location conten in dynamic data storage district with operation, revise the content of relevant position in the memory mapping earlier; Initiating a message allows background task that the Flash district data at place, dynamic data storage district are all wiped again, and again full content in the memory mapping is written to the dynamic data storage district again;
When needs were read the data in dynamic data storage district, directly rdma read reflection relevant position data just could.
Utilize the backstage erasable, the relatively good operating speed problem that has solved when the alternative E2PROM of Flash stores dynamic data of prior art.
Yet prior art has following defective:
1. greatly reduce the serviceable life of Flash.Will be certain bit " 1 " be rewritten as " 0 " time can directly write, but will be certain bit " 0 " be rewritten as " 1 " just must carry out wiping earlier the operation of writing again, and Flash to wipe with block (block) be unit, the life-span of Flash also is to depend on erasing times.The frequent Flash that carries out wipes, and obviously greatly reduces the serviceable life of equipment.
2. greatly reduce equipment work stability and security.Write owing to when the information of modification, must wipe again earlier, and erase process is topmost time-consuming process, has accounted for 95% left and right sides time of whole information correction process.The Block that wipes a 64K needs about 1.5 seconds, and the Block that writes a 64K is less than 50 milliseconds.If sudden power in revising information process like this, very big may be exactly also to be in the erase process, and the information of outage back memory mapping is all lost, in Flash also because erase process has been lost full detail.Cause the information dropout in all dynamic data storage districts like this and can't recover, made setting can't normally carry out work.In addition, carry out because the erase process of Flash needs CPU to send a large amount of corresponding driving sequential, frequent erase process has taken cpu resource greatly and then may influence other system works, has reduced the operational efficiency and the security of total system.
Summary of the invention
The purpose of this invention is to provide the method that a kind of Flash of utilization storer carries out dynamic data storage, it can improve Flash storer serviceable life, job stability and security.
For solving technical matters of the present invention, the present invention discloses the method that a kind of Flash of utilization storer carries out dynamic data storage, its at least one block with described Flash storer is made as the dynamic data storage district, described dynamic data storage zoning is divided into a Back ground Information district and a log record district, described Back ground Information district is used to store revises preceding data to data, described log record district is used to write down the retouching operation that data are carried out, described operation log recording to the modification information of data content.
As a kind of improvement of said method, described Flash memory block is provided with two dynamic data storage districts, and described two dynamic data storage districts are mirror image each other.
Compared to prior art, method of the present invention repeatedly writes by once wiping, and makes can to carry out hundreds and thousands of times write operations, the serviceable life of having improved Flash greatly after wiping once; And when revising information, only need write, speed is fast, has reduced the occupancy of CPU, has improved the total system performance; at every turn Simultaneously, the way that has adopted two dynamic data storage district to set up data image realizes recovering the function of the data of losing because of outage, has improved the data security in the process of reconstruction.
Description of drawings
Fig. 1 is the process flow diagram that system boot is set up Back ground Information district and Data Detection recovery.
Fig. 2 is a process flow diagram of setting up Back ground Information district and log record district.
Fig. 3 is the program flow diagram that the dynamic data storage district is revised by system.
Embodiment
Analyze the Flash principle of work as can be known, actual to the block erase process be a process that these all contents of Block storage space is changed to " 1 ".Wipe finish after all positions all be " 1 ", at this moment can internal memory is direct to be changed to " 0 " to the optional position content as operating; In actual applications, the size of a block of Flash is generally 64K, and the required size that is used for storing the space of dynamic data generally is no more than 32K; The size of the each data content that need revise is several to dozens of bytes just.So just can note each retouching operation as keeping a diary the content that just needs modification of each record.
Among the present invention, utilize Flash to substitute the method that E2PROM (suppose size for 32K) carries out dynamic data storage to be: determine earlier among the Flash that block that 2 sizes are 64K is respectively initiatively the attitude data storage area and from dynamic data storage area, 32K was the Back ground Information district in dynamic data storage district before each dynamic data storage device was divided, and then 32K is the operation log recording district in dynamic data storage district.The Back ground Information district is used for storage data is carried out preoperative raw data, and the operation log recording district then is used to write down the retouching operation daily record that this raw data is carried out, and the content that changes that promptly is modified is that the form with daily record is recorded in log area.This journal format comprises offset, data length and data content and data logging action version.When initialization next time, system can calculate current data according to the raw data in Back ground Information district and the Operation Log in log record district.
See also Fig. 1, the flow process that system boot is set up Back ground Information district and Data Detection recovery is: the memory mapping district that sets up 32K earlier; Read the most preceding zone bit and the last zone bit of attitude data storage area initiatively and judge this most preceding zone bit and whether last zone bit is effective status, thereby judge initiatively whether the data of attitude data storage area are effective; If initiatively the data of attitude data storage area are invalid, the corresponding zone bit that then continues to read from dynamic data storage area is judged, if the result who judges is for denying, illustrate that then this system never used, by default system initialization memory mapping district is set, if the result who judges is for being, then from the content replication of dynamic data storage area to active attitude data storage area, carry out next step operation; If initiatively the data of attitude data storage area are effective, then the memory mapping district is arrived in the content replication in Back ground Information district in the active attitude data storage area, and travel through whole log record district, in memory mapping, operate according to this according to Operation Log information according to the time order and function order and revise the data content that data have obtained final state; Call the Back ground Information district at last and the log record district sets up flow process, and the data content of the final state that obtains in the memory mapping is write the Back ground Information district.
See also Fig. 2, the flow process of setting up in Back ground Information district and log record district is: the whole district of wiping the dynamic data storage district; Write the most preceding zone bit in dynamic data storage district, with the reference position in sign dynamic data storage district; Data in the memory mapping district are written to the Back ground Information district; Write the last zone bit in dynamic data storage district; It is the reference position in log record district that but the current writing position in log record district is set.So be provided with finish after, that can set up the dynamic data storage district sets up Back ground Information district and log record district.
See also Fig. 3, the process that system makes amendment to the data of dynamic area is: the content of revising relevant position, memory mapping district earlier; Obtain the information such as offset, data length and data content of the content of revising; Information such as offset, data length and data content according to the modification content generate an Operation Log information; But the information such as current writing position in log record district and remaining space size that obtain also judge in view of the above whether the log record district has enough spaces to write this Operation Log information; If then write this Operation Log information to the log record district; If not, then call the Back ground Information district and the log record district sets up flow process, refresh the dynamic data storage district.
Compared to prior art, method of the present invention repeatedly writes by once wiping, so that can carry out hundreds and thousands of times write operation, the service life of greatly having improved Flash after wiping once; And when revising information, only need to write, speed is fast, has reduced the occupancy of CPU, has improved whole systematic function; at every turn Simultaneously, the way that has adopted two dynamic data storage district to set up data image realizes recovering the function because of the outage missing data, has improved the Information Security in the process of reconstruction.
In addition, those skilled in the art also can do other variation in spirit of the present invention, such as, also can adopt single action attitude data memory block. The variation that these are done according to spirit of the present invention all should be included in the claimed range of the present invention
Claims (6)
1. method of utilizing the Flash storer to carry out dynamic data storage, it is characterized in that, at least one block of described Flash storer is made as the dynamic data storage district, described dynamic data storage zoning is divided into a Back ground Information district and a log record district, described Back ground Information district is used to store revises preceding data to data, described log record district is used to write down the Operation Log that data are carried out, described operation log recording to the modification information of data content.
2. the Flash of utilization storer according to claim 1 carries out the method for dynamic data storage, it is characterized in that, described Flash memory block is provided with two dynamic data storage districts, and described two dynamic data storage districts are mirror image each other.
3. the Flash of utilization storer according to claim 1 carries out the method for dynamic data storage, it is characterized in that, described Operation Log is by the data-bias position, data length, and data content, data logging action version is formed.
4. the Flash of utilization storer according to claim 1 carries out the method for dynamic data storage, it is characterized in that, the flow process of setting up in described Back ground Information district and log record district is: the whole district of wiping the dynamic data storage district; Write the most preceding zone bit in dynamic data storage district, with the reference position in sign dynamic data storage district; Data in the memory mapping district are written to the Back ground Information district; Write the last zone bit in dynamic data storage district; It is the reference position in log record district that but the current writing position in log record district is set.
5. the Flash of utilization storer according to claim 1 carries out the method for dynamic data storage, it is characterized in that, the process that the data of dynamic area are made amendment is: the content of revising relevant position, memory mapping district earlier; Obtain offset, data length and the data content of the content of revising; Offset, data length and data content according to the modification content generate an Operation Log information; But obtain current writing position in log record district and remaining space size and judge in view of the above whether the log record district has enough spaces to write this Operation Log information; If then write this Operation Log information to the log record district; If not, then call the Back ground Information district and the log record district sets up flow process, refresh the dynamic data storage district.
6. the Flash of utilization storer according to claim 1 carries out the method for dynamic data storage, it is characterized in that, the flow process that system boot is set up the Back ground Information district is: the memory mapping district that sets up the dynamic data storage district earlier; The memory mapping district is arrived in the content replication in Back ground Information district in the dynamic data storage district, and travel through whole log record district, in memory mapping, operate according to this according to Operation Log information according to the time order and function order and revise the data content that data have obtained final state; Call the Back ground Information district at last and the log record district sets up flow process, and the data content of the final state that obtains in the memory mapping is write the Back ground Information district.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101069785A CN101887750A (en) | 2009-05-15 | 2009-05-15 | Method for storing dynamic data by using Flash memory |
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| CN2009101069785A CN101887750A (en) | 2009-05-15 | 2009-05-15 | Method for storing dynamic data by using Flash memory |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981944A (en) * | 2012-12-12 | 2013-03-20 | 青岛海信宽带多媒体技术有限公司 | Log storage method based on file system |
| CN103324493A (en) * | 2012-03-20 | 2013-09-25 | 安凯(广州)微电子技术有限公司 | Method and system for increasing booting speed of system based on NAND FLASH |
| CN105302679A (en) * | 2015-11-03 | 2016-02-03 | 惠州Tcl移动通信有限公司 | Detection method and system for intelligent terminal storage stability |
| WO2016165597A1 (en) * | 2015-04-16 | 2016-10-20 | 中兴通讯股份有限公司 | Processing method and device for data storage |
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| TW515948B (en) * | 1999-12-20 | 2003-01-01 | Jian-Tsz Hou | Content securing method of non-volatile storage device and architecture thereof |
| CN101101572A (en) * | 2007-08-10 | 2008-01-09 | 北京海尔集成电路设计有限公司 | Method, device and apparatus for processing data recording of NOR type flash memory |
| CN101140536A (en) * | 2007-05-21 | 2008-03-12 | 中兴通讯股份有限公司 | Snapshot system supporting cascades snapshot and snapshot processing method thereof |
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2009
- 2009-05-15 CN CN2009101069785A patent/CN101887750A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW515948B (en) * | 1999-12-20 | 2003-01-01 | Jian-Tsz Hou | Content securing method of non-volatile storage device and architecture thereof |
| CN101140536A (en) * | 2007-05-21 | 2008-03-12 | 中兴通讯股份有限公司 | Snapshot system supporting cascades snapshot and snapshot processing method thereof |
| CN101101572A (en) * | 2007-08-10 | 2008-01-09 | 北京海尔集成电路设计有限公司 | Method, device and apparatus for processing data recording of NOR type flash memory |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103324493A (en) * | 2012-03-20 | 2013-09-25 | 安凯(广州)微电子技术有限公司 | Method and system for increasing booting speed of system based on NAND FLASH |
| CN103324493B (en) * | 2012-03-20 | 2016-10-05 | 安凯(广州)微电子技术有限公司 | System boot accelerating method based on NAND FLASH and system |
| CN102981944A (en) * | 2012-12-12 | 2013-03-20 | 青岛海信宽带多媒体技术有限公司 | Log storage method based on file system |
| CN102981944B (en) * | 2012-12-12 | 2016-04-20 | 青岛海信宽带多媒体技术有限公司 | A kind of log storing method based on file system |
| WO2016165597A1 (en) * | 2015-04-16 | 2016-10-20 | 中兴通讯股份有限公司 | Processing method and device for data storage |
| CN105302679A (en) * | 2015-11-03 | 2016-02-03 | 惠州Tcl移动通信有限公司 | Detection method and system for intelligent terminal storage stability |
| CN105302679B (en) * | 2015-11-03 | 2019-04-30 | 惠州Tcl移动通信有限公司 | A kind of detection method and system of intelligent terminal storage stability |
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