CN105279048A - Data recovery method and device - Google Patents
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- CN105279048A CN105279048A CN201510866695.6A CN201510866695A CN105279048A CN 105279048 A CN105279048 A CN 105279048A CN 201510866695 A CN201510866695 A CN 201510866695A CN 105279048 A CN105279048 A CN 105279048A
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Abstract
The invention discloses a data recovery method and device. The method includes the steps of reading existing xor information obtained by conducting xor on the assigned position of original data when the original data are stored to an assigned area, an existing check code obtained by conducting calculation on the original data according to an assigned algorithm and existing position information of the positions where all data, having check codes consistent with an existing check code, in the original data if mistakes exist in assigned data read from the assigned area, generating N primary selection data corresponding to the existing xor information, calculating the target check code of each target primary selection datum according to the assigned algorithm, determining the primary selection data corresponding to the target check codes consistent with the existing check code as final selection data, determining the positions where all data of the check codes consistent with the existing check code in the final selection data as target position information, and determining the final selection data corresponding to the target position information consistent with the existing position information as the original data. Therefore, data reliability is ensured.
Description
Technical field
The present invention relates to chip design art field, more particularly, relate to a kind of data reconstruction method and device.
Background technology
Along with the RAM (Random-AccessMemory used in chip, random access memory) more and more, scale is increasing, improve RAS (Reliability, Availability and Serviceability of RAM, reliability, reliability availability and serviceability) performance becomes the reliability and availability improving whole chip, and then reduce one of the key factor of use cost of chip.
But due to reasons such as manufacture or times, the situation of the corrupt data stored may appear in RAM, once the corrupt data that RAM stores, chip failure or chip efficiency will be caused to decline.Preferably a kind of method that data for storing RAM in prior art carry out error correction is ECC (ErrorCheckingandCorrection, bug check and correction) checking algorithm, but, traditional ECC checking algorithm can only correct the situation that a data is made mistakes, once occur that long numeric data is made mistakes, then helpless, therefore, cause the data reliability of RAM lower.
In sum, there is the lower problem of reliability in the technical scheme that the data for storing RAM in prior art carry out error correction.
Summary of the invention
The object of this invention is to provide a kind of data reconstruction method and device, to solve the lower problem of reliability that prior art carries out existing in the technical scheme of error correction to the data that RAM stores.
To achieve these goals, the invention provides following technical scheme:
A kind of data reconstruction method, comprising:
If the specific data read by appointed area exists mistake, then read the original position information of when in advance raw data being stored to appointed area, the specific bit of this raw data being carried out to former XOR information that XOR obtains, the former check code this raw data calculated according to assignment algorithm and this raw data present position in the total data with the check code consistent with described former check code;
Generate the N number of primary election data corresponding with described former XOR information, and calculate the object identifier code of each primary election data according to described assignment algorithm;
Determine that the primary election data that the object identifier code consistent with described former check code is corresponding select data for whole, and determine that the position selecting data residing in the total data with the check code consistent with described former check code described end is target position information;
Determine that the end that the target position information consistent with described original position information is corresponding selects data to be raw data.
Preferably, XOR is carried out to the specific bit of described raw data and obtains former XOR information, comprising:
XOR is carried out to two bits adjacent in described raw data, obtains the former XOR information that its length equals the half of described raw data length.
Preferably, according to assignment algorithm, former check code is calculated to described raw data, comprising:
Utilize ECC checking algorithm to calculate described raw data, obtain described former check code.
Preferably, determine that the positional information of described raw data comprises:
The total data with the check code consistent with described former check code is sorted according to default rule, obtains data sequence, and determine that the position residing in described data sequence of described raw data is described original position information.
Preferably, also comprise:
Specific data is read by described appointed area, and utilize ECC checking algorithm to judge whether there is misdata position in described specific data, if, then judge whether described misdata position is 1, if described misdata position is 1, then obtain raw data according to described ECC checking algorithm, if described misdata position is not 1, then obtain described former XOR information, former check code and original position information.
A kind of Data Recapture Unit, comprising:
Read module, if there is mistake for the specific data read by appointed area, then reads former XOR information, former check code and original position information;
XOR module, carries out XOR to the specific bit of this raw data during in advance raw data being stored to appointed area and obtains former XOR information;
Check code module, calculates former check code according to assignment algorithm to this raw data during in advance raw data being stored to appointed area;
Position module, determines during in advance raw data being stored to appointed area that the position residing for this raw data is in the total data with the check code consistent with described former check code is original position information;
Generation module, for generating the N number of primary election data corresponding with described former XOR information, and calculates the object identifier code of each primary election data according to described assignment algorithm;
First determination module, for determining that the primary election data that the object identifier code consistent with described former check code is corresponding select data for whole, and determine that the position selecting data residing in the total data with the check code consistent with described former check code described end is target position information;
Second determination module, for determining that the end that the target position information consistent with described original position information is corresponding selects data to be raw data.
Preferably, XOR module comprises:
XOR unit, for carrying out XOR to two bits adjacent in described raw data, obtains the former XOR information that its length equals the half of described raw data length.
Preferably, check code module comprises:
Check code unit, for utilizing ECC checking algorithm to calculate described raw data, obtains described former check code.
Preferably, position module comprises:
Position units, for the total data with the check code consistent with described former check code being sorted according to default rule, obtains data sequence, and determines that the position residing in described data sequence of described raw data is described original position information.
Preferably, also comprise:
Trigger acquisition module, for reading specific data by described appointed area, and utilize ECC checking algorithm to judge whether there is misdata position in described specific data, if, then judge whether described misdata position is 1, if described misdata position is 1, then obtain raw data according to described ECC checking algorithm, if described misdata position is not 1, then obtain described former XOR information, former check code and original position information.
A kind of data reconstruction method provided by the invention and device, the method comprises: if the specific data read by appointed area exists mistake, then read the original position information of when in advance raw data being stored to appointed area, the specific bit of this raw data being carried out to former XOR information that XOR obtains, the former check code calculated this raw data according to assignment algorithm and this raw data present position in the total data with the check code consistent with former check code; Generate the N number of primary election data corresponding with former XOR information, and calculate the object identifier code of each primary election data according to assignment algorithm; Determine that the primary election data that the object identifier code consistent with former check code is corresponding select data for whole, and determine that the position selecting data residing in the total data with the check code consistent with former check code is eventually target position information; Determine that the end that the target position information consistent with original position information is corresponding selects data to be raw data.Compared with prior art, in the application when the specific data read exists mistake, the former XOR information corresponding with raw data is utilized to obtain N number of primary election data, and then determine that the primary election data that identifying code mates with the former identifying code of raw data select data for whole, finally determine to select the end of the original position information matches of positional information and raw data data to be raw data, thus, no matter occur that the figure place of mistake is several in specific data, all can based on former XOR information, former check code and original position information determine correct raw data, by this error correcting system being back-calculated to obtain correct raw data by above-mentioned information, ensure that data reliability, solve the problem that reliability that prior art carries out existing in the technical scheme of error correction to the data that RAM stores is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The process flow diagram of a kind of data reconstruction method that Fig. 1 provides for the embodiment of the present invention;
The trigger flow figure of step S11 to step S14 is performed in a kind of data reconstruction method that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of Data Recapture Unit that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, it illustrates the process flow diagram of a kind of data reconstruction method that the embodiment of the present invention provides, can comprise the following steps:
S11: if the specific data read by appointed area exists mistake, then read the original position information of when in advance raw data being stored to appointed area, the specific bit of this raw data being carried out to former XOR information that XOR obtains, the former check code calculated this raw data according to assignment algorithm and this raw data present position in the total data with the check code consistent with former check code.
Wherein, raw data and specific data are mutually corresponding data, and namely raw data is the data being stored to appointed area, and specific data is the data in being read by appointed area, in other words, if there is not mistake in specific data, then specific data i.e. raw data.In addition, another kind of mode-the data backup ensureing data reliability is also there is in prior art, namely when mistake appears in the data stored, by the mode recovering corresponding data in the data backed up, and the corresponding relation of the check code determination data generated by ECC checking algorithm, but, this mode needs the area increasing considerably chip for storing the backup of data, and in the technique scheme that the application provides, the former XOR information obtained, former check code, the figure place of original position information and raw data and be less than raw data and former check code figure place and twice, therefore, relative to the mode of above-mentioned data backup, the technical scheme that the application provides can reduce the chip area needing to increase to a certain extent, reduce the manufacturing cost of chip.
S12: generate the N number of primary election data corresponding with former XOR information, and calculate the object identifier code of each primary election data according to assignment algorithm.
Generate the N number of primary election data corresponding with former XOR information be according to former XOR information retrodict out can carry out XOR to its specific bit after obtain the total data of former XOR information, namely, the figure place of former XOR information is less than the figure place of raw data, and therefore, a former XOR information may correspond to multiple data.
S13: determine that the primary election data that the object identifier code consistent with former check code is corresponding select data for whole, and determine that the position selecting data residing in the total data with the check code consistent with former check code is eventually target position information.
The figure place of former check code is less than the figure place of raw data, and therefore, a former check code may correspond to multiple data, and also therefore, the primary election data that the object identifier code consistent with former check code determined is corresponding may for multiple.
S14: determine that the end that the target position information consistent with original position information is corresponding selects data to be raw data.
Certainly be identical having the data that in the data pool of the data composition of same check code there is same position, therefore, can effectively and accurately raw data is recovered by above-mentioned steps.
In the application when the specific data read exists mistake, the former XOR information corresponding with raw data is utilized to obtain N number of primary election data, and then determine that the primary election data that identifying code mates with the former identifying code of raw data select data for whole, finally determine to select the end of the original position information matches of positional information and raw data data to be raw data, thus, no matter occur that the figure place of mistake is several in specific data, all can based on former XOR information, former check code and original position information determine correct raw data, by this error correcting system being back-calculated to obtain correct raw data by above-mentioned information, achieve can repairing completely of any misdata, ensure that data reliability, solve the problem that reliability that prior art carries out existing in the technical scheme of error correction to the data that RAM stores is lower, further increase reliability, availability, processor and the chip reliability of RAM.
In a kind of data reconstruction method that above-described embodiment provides, XOR is carried out to the specific bit of raw data and obtains former XOR information, can comprise:
XOR is carried out to two bits adjacent in raw data, obtains the former XOR information that its length equals the half of raw data length.
It should be noted that; when XOR is carried out to specific bit in raw data; specific bit can be determined according to actual needs; as first and last position; second and penultimate; by that analogy, also only XOR can be carried out, all within protection scope of the present invention to the partial data position in raw data according to actual needs.Preferably, XOR can be carried out to two bits adjacent in raw data, as the raw data of 8, first and second be carried out XOR, 3rd and the 4th is carried out XOR, 5th and the 6th is carried out XOR, and the 7th and the 8th is carried out XOR, and the data obtained by XOR are arranged in order, form the former XOR information of 4, now, push away former XOR information is counter, a 4 powers data of 2 can be obtained.And the algorithm of XOR is:
if a, b two value is not identical, then XOR result is 1, if a, b two value is identical, then XOR result is 0.After obtaining the former XOR information of raw data, former XOR information can be stored to correspondence position, for reading.
And according to assignment algorithm, former check code is calculated to raw data, can comprise:
Utilize ECC checking algorithm to calculate raw data, obtain former check code.
Wherein, ECC checking algorithm is classic algorithm of the prior art, does not repeat them here.By ECC checking algorithm, raw data is calculated, corresponding former check code can be obtained, as calculated the data of 8, the check code of 5 can be obtained, data bits often doubles, and check code figure place only increases by one, namely calculates the data of 16, the check code of 6 can be obtained, by that analogy.After obtaining the former check code of raw data, former check code and raw data together can be write in RAM, for reading.
In addition, determine that the positional information of raw data can comprise:
The total data with the check code consistent with former check code is sorted according to default rule, obtains data sequence, and determine that the position residing in data sequence of raw data is original position information.
Figure place due to former check code is less than the figure place of raw data, and therefore, a former check code may correspond to multiple data, as raw data be 8 time, the check code of 5 may correspond to 2
8/ 2
5individual data, and raw data is only one of them, therefore to these data according to default rule, it can be the size according to data, also can be randomly ordered etc., form data sequence, determine that the position of raw data in data sequence is original position information, the figure place of original position information is relevant to the number of data, when the number of data is not more than 10, the figure place of original position information only needs 1, when the number of data is greater than 10, the figure place of original position information needs 2, by that analogy.As raw data be 8 time, its original position information is 1, and when raw data is 16, its positional information is 2.After obtaining original position information, original position information can be stored to correspondence position, for reading.
In a kind of data reconstruction method that above-described embodiment provides, as shown in Figure 2, can also comprise the following steps:
S21: read specific data by appointed area, and utilize ECC checking algorithm to judge whether there is misdata position in specific data, if so, then perform step S22, if not, then perform step S23.
It should be noted that, whether there is misplaced data position in specific data is classical way of the prior art, does not repeat them here to utilize ECC checking algorithm to judge.
S22: whether misjudgment data bit is 1, if so, then performs step S24, if not, then performs step S25.
S23: determine that specific data is correct raw data.
S24: obtain raw data according to ECC checking algorithm.
Because ECC checking algorithm can carry out error correction to the data dislocation of 1, therefore, when judging the error in data position having 1 in specific data, namely this mistake is repairable mistake, now only need to utilize ECC checking algorithm to carry out error correction to it, be classical way of the prior art as the process utilizing ECC checking algorithm to carry out 1 bit data error correction, do not repeat them here.
S25: obtain former XOR information, former check code and original position information.
If the data bits of the mistake existed in specific data is greater than 1, the i.e. not repairable mistake of this error bit, now, a kind of data reconstruction method utilizing the embodiment of the present invention to provide then is needed to obtain raw data, thereby, it is possible to combined with a kind of data reconstruction method that the application provides by ECC checking algorithm, different schemes is adopted to recover raw data according to the difference of data bits, the basis saving logical resource achieves the recovery completely of raw data, ensure that data reliability.
For the RAM of 8 bit wides, introduce the implementation process of a kind of data reconstruction method that the embodiment of the present invention provides:
Write RAM operation: utilize ECC checking algorithm to generate 5 the former check codes corresponding with 8 raw data, and by raw data and former check code stored in RAM, the mode of adjacent two XORs is adopted to generate 4 the former XOR information corresponding with raw data, utilize 1 original position information of former check code determination raw data, and by former XOR information and original position information stored in independent RAM;
Read RAM operation: read the specific data in RAM, and whether specific data exists mistake to utilize ECC checking algorithm to judge, if there is no, then the direct specific data to obtaining carries out the process such as transmission, if existed, the figure place of then misjudgment data, if 1, then ECC checking algorithm is directly utilized to recover raw data, otherwise, then trigger and obtain former XOR information, original position information and former check code, and recover raw data according to such scheme disclosed in the present invention.
Corresponding with said method embodiment, the embodiment of the present invention additionally provides a kind of Data Recapture Unit, as shown in Figure 3, can comprise:
Read module 31, if there is mistake for the specific data read by appointed area, then reads former XOR information, former check code and original position information;
XOR module 32, carries out XOR to the specific bit of this raw data during in advance raw data being stored to appointed area and obtains former XOR information;
Check code module 33, calculates former check code according to assignment algorithm to this raw data during in advance raw data being stored to appointed area;
Position module 34, determines during in advance raw data being stored to appointed area that the position residing for this raw data is in the total data with the check code consistent with former check code is original position information;
Generation module 35, for generating the N number of primary election data corresponding with former XOR information, and calculates the object identifier code of each primary election data according to assignment algorithm;
First determination module 36, for determining that the primary election data that the object identifier code consistent with former check code is corresponding select data for whole, and determines that the position selecting data residing in the total data with the check code consistent with former check code is eventually target position information;
Second determination module 37, for determining that the end that the target position information consistent with original position information is corresponding selects data to be raw data.
In the application when the specific data read exists mistake, the former XOR information corresponding with raw data is utilized to obtain N number of primary election data, and then determine that the primary election data that identifying code mates with the former identifying code of raw data select data for whole, finally determine to select the end of the original position information matches of positional information and raw data data to be raw data, thus, no matter occur that the figure place of mistake is several in specific data, all can based on former XOR information, former check code and original position information determine correct raw data, by this error correcting system being back-calculated to obtain correct raw data by above-mentioned information, achieve can repairing completely of any misdata, ensure that data reliability, solve the problem that reliability that prior art carries out existing in the technical scheme of error correction to the data that RAM stores is lower, further increase reliability, availability, processor and the chip reliability of RAM.
In addition, the information that XOR module and position module obtain can be deposited in information storage module, and, different module accessible site is same module, if generation module, the first determination module and the second determination module accessible site are same module, namely repair logic module, be not specifically limited in the present invention.
In a kind of data recovery module that above-described embodiment provides, XOR module can comprise:
XOR unit, for carrying out XOR to two bits adjacent in raw data, obtains the former XOR information that its length equals the half of raw data length.
In a kind of data recovery module that above-described embodiment provides, check code module can comprise:
Check code unit, for utilizing ECC checking algorithm to calculate raw data, obtains former check code.
In a kind of data recovery module that above-described embodiment provides, position module can comprise:
Position units, for the total data with the check code consistent with former check code being sorted according to its length, obtains data sequence, and determines that the position residing in data sequence of raw data is original position information.
In a kind of data recovery module that above-described embodiment provides, can also comprise:
Trigger acquisition module, for reading specific data by appointed area, and utilize ECC checking algorithm to judge whether there is misdata position in specific data, if, whether then misjudgment data bit is 1, if misplaced data position is 1, then obtains raw data according to ECC checking algorithm, if misdata position is not 1, then obtain former XOR information, former check code and original position information.
A kind of data reconstruction method provided due to the embodiment of the present invention is corresponding with a kind of Data Recapture Unit that the embodiment of the present invention provides, therefore, in said apparatus embodiment, the explanation of related content refers to the explanation of corresponding content in said method embodiment, does not repeat them here.
To the above-mentioned explanation of the disclosed embodiments, those skilled in the art are realized or uses the present invention.To be apparent for a person skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a data reconstruction method, is characterized in that, comprising:
If the specific data read by appointed area exists mistake, then read the original position information of when in advance raw data being stored to appointed area, the specific bit of this raw data being carried out to former XOR information that XOR obtains, the former check code this raw data calculated according to assignment algorithm and this raw data present position in the total data with the check code consistent with described former check code;
Generate the N number of primary election data corresponding with described former XOR information, and calculate the object identifier code of each primary election data according to described assignment algorithm;
Determine that the primary election data that the object identifier code consistent with described former check code is corresponding select data for whole, and determine that the position selecting data residing in the total data with the check code consistent with described former check code described end is target position information;
Determine that the end that the target position information consistent with described original position information is corresponding selects data to be raw data.
2. method according to claim 1, is characterized in that, carries out XOR and obtains former XOR information, comprising the specific bit of described raw data:
XOR is carried out to two bits adjacent in described raw data, obtains the former XOR information that its length equals the half of described raw data length.
3. method according to claim 2, is characterized in that, calculates former check code, comprising according to assignment algorithm to described raw data:
Utilize ECC checking algorithm to calculate described raw data, obtain described former check code.
4. method according to claim 3, is characterized in that, determines that the positional information of described raw data comprises:
The total data with the check code consistent with described former check code is sorted according to default rule, obtains data sequence, and determine that the position residing in described data sequence of described raw data is described original position information.
5. the method according to any one of Claims 1-4, is characterized in that, also comprises:
Specific data is read by described appointed area, and utilize ECC checking algorithm to judge whether there is misdata position in described specific data, if, then judge whether described misdata position is 1, if described misdata position is 1, then obtain raw data according to described ECC checking algorithm, if described misdata position is not 1, then obtain described former XOR information, former check code and original position information.
6. a Data Recapture Unit, is characterized in that, comprising:
Read module, if there is mistake for the specific data read by appointed area, then reads former XOR information, former check code and original position information;
XOR module, carries out XOR to the specific bit of this raw data during in advance raw data being stored to appointed area and obtains former XOR information;
Check code module, calculates former check code according to assignment algorithm to this raw data during in advance raw data being stored to appointed area;
Position module, determines during in advance raw data being stored to appointed area that the position residing for this raw data is in the total data with the check code consistent with described former check code is original position information;
Generation module, for generating the N number of primary election data corresponding with described former XOR information, and calculates the object identifier code of each primary election data according to described assignment algorithm;
First determination module, for determining that the primary election data that the object identifier code consistent with described former check code is corresponding select data for whole, and determine that the position selecting data residing in the total data with the check code consistent with described former check code described end is target position information;
Second determination module, for determining that the end that the target position information consistent with described original position information is corresponding selects data to be raw data.
7. device according to claim 6, is characterized in that, XOR module comprises:
XOR unit, for carrying out XOR to two bits adjacent in described raw data, obtains the former XOR information that its length equals the half of described raw data length.
8. device according to claim 7, is characterized in that, check code module comprises:
Check code unit, for utilizing ECC checking algorithm to calculate described raw data, obtains described former check code.
9. device according to claim 8, is characterized in that, position module comprises:
Position units, for the total data with the check code consistent with described former check code being sorted according to default rule, obtains data sequence, and determines that the position residing in described data sequence of described raw data is described original position information.
10. the device according to any one of claim 6 to 9, is characterized in that, also comprises:
Trigger acquisition module, for reading specific data by described appointed area, and utilize ECC checking algorithm to judge whether there is misdata position in described specific data, if, then judge whether described misdata position is 1, if described misdata position is 1, then obtain raw data according to described ECC checking algorithm, if described misdata position is not 1, then obtain described former XOR information, former check code and original position information.
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