CN102147848A - Method for setting operation frequency of storage card and related card reading device - Google Patents
Method for setting operation frequency of storage card and related card reading device Download PDFInfo
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- CN102147848A CN102147848A CN2010101185331A CN201010118533A CN102147848A CN 102147848 A CN102147848 A CN 102147848A CN 2010101185331 A CN2010101185331 A CN 2010101185331A CN 201010118533 A CN201010118533 A CN 201010118533A CN 102147848 A CN102147848 A CN 102147848A
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Abstract
The invention relates to a method for setting an operation frequency of a storage card and a related card reading device. The method comprises the following steps: carrying out an operation frequency adjustment flow so as to select an objective operation frequency; and using the objective operation frequency to set the operation frequency of the storage card. The step of carrying out the operation frequency adjustment flow comprises: selecting a plurality of candidate operation frequencies; testing the access efficiency of the storage card when the storage card operates in the plurality of candidate operation frequencies so as to respectively generate a plurality of testing results; and selecting one of the plurality of candidate operation frequencies as the objective operation frequency according to the plurality of testing results.
Description
Technical field
Relevant a kind of method and the relevant reader device of setting storage card of the present invention especially refers to a kind of method and relevant reader device of setting the operating frequency of storage card.
Background technology
Data memory device (data storage device) is a ring indispensable in the computer system, and along with functional difference, kind is also considerably various.Because the volume of data memory device is constantly reduced, make to have occurred Portable data memory device miscellaneous on the market, for example: flash memory cards (flash memory card) and external connected hand disk machine etc.In view of the convenience on using, and consider these data memory devices and usually must do processing on the data by computer system, therefore develop and many external interface devices of being convenient to connect these data memory devices, make the computer system can be by external mode, simply and these data memory devices of access promptly, and these external access devices can be supported the data memory device that several specifications are different usually.Yet wherein because the kind of the specification of flash memory cards is the most various, so also suitable various of the external access device that derives, this series products also often is calculating punch (card reader) by address.
Safe digital (Secure Digital, SD) storage card is a kind of standard of storage card, it is used on mancarried device widely, for example digital camera, personal digital assistant (personal digital assistant, PDA) and multimedia player etc.The technology of safe digital storage card is to build on multimedia storage card (Multimedia Card, on form MMC), and the safe digital storage card also has the higher data transfer rate, and new standard more constantly.The up-to-date specification of safe digital storage card is the SDA3.0 that safe digital storage card association (SD Card Association) is delivered at present, the highest operating frequency of storage card of its standard is 208MHz, the highest operating frequency 50MHz compared with last generation SDA2.0 institute standard wants high four times, though higher operating frequency makes storage card that better access usefulness can be arranged, operate under the high frequency and also can bring higher power consumption and electromagnetic interference (EMI) phenomenon to storage card.In addition, in some cases, meet the safe digital storage card of SDA2.0 specification if only work in the highest operating frequency 50MHz of SDA2.0 institute standard, possibly can't reach its best access usefulness, just can obtain better storage card access usefulness if the raising frequency (that is overclocking) that carries out that can be suitable is operated this moment in the storage card permissible range.Therefore, if can be, just can effectively reduce power consumption and electromagnetic interference (EMI) phenomenon or increase the access usefulness of storage card under the situation that does not influence storage card access usefulness or in the storage card permissible range and its operating frequency of adjustment that can be suitable.
Summary of the invention
Therefore, one of purpose of the present invention is to provide a kind of method and relevant reader device of setting the operating frequency of storage card, to solve the above problems.
A kind of method of an operating frequency of setting one storage card is provided according to one aspect of the present invention.This method includes the following step: carry out operating frequency adjustment flow process and select an object run frequency; And use this object run frequency to set this operating frequency of this storage card.The step of wherein carrying out this operating frequency adjustment flow process includes: select a plurality of candidate operations frequencies; Access usefulness when testing this storage and being stuck under these a plurality of candidate operations frequencies running is to produce a plurality of test results respectively; And, select one certainly in these a plurality of candidate operations frequencies as this object run frequency according to these a plurality of test results.
Provide a kind of reader device according to another aspect of the present invention in order to accessing memory card.This reader device includes a storage device and a processor.This storage device stores has a program code.This processor is coupled to this storage device, carries out following steps in order to carry out this program code: carry out operating frequency adjustment flow process and select an object run frequency; And use this object run frequency to set this operating frequency of this storage card.The step of wherein carrying out this operating frequency adjustment flow process includes: select a plurality of candidate operations frequencies; Access usefulness when testing this storage and being stuck under these a plurality of candidate operations frequencies running is to produce a plurality of test results respectively; And, select one certainly in these a plurality of candidate operations frequencies as this object run frequency according to these a plurality of test results.
The present invention compared to the useful technique effect of prior art is: because the present invention selects a plurality of candidate operations frequencies, and the access usefulness when testing this storage and being stuck under these candidate operations frequencies running produces a plurality of test results respectively, then by analyze and relatively these test results just can select suitable storing card operation frequency.With the safe digital storage card that meets the SDA3.0 specification is example, if under two different candidate operations frequencies, the difference of storage card access usefulness is in a preset range, just can select lower frequency (that is frequency reducing operation) to be used as the storing card operation frequency, thus cpable of lowering power consumption and electromagnetic interference (EMI) phenomenon.If with the safe digital storage card that meets the SDA2.0 specification is example, can in the storage card permissible range, carries out raising frequency and operate and obtain better storage card access usefulness.Therefore, the operating frequency of the adjustment storage card that the present invention can be suitable, and under the situation that does not influence storage card access usefulness effectively reduces power consumption and electromagnetic interference (EMI) phenomenon or increase the access usefulness of storage card in the storage card permissible range.
Description of drawings
Fig. 1 is the synoptic diagram of reader device in one embodiment of the invention.
Fig. 2 is a process flow diagram of setting the operating frequency method of storage card in one embodiment of the invention.
Embodiment
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of reader device 100 in one embodiment of the invention.Reader device 100 is in order at least one storage card 101 of access, and includes (but a being not limited to) storage device 110 and a processor 120.Storage device 110 stores a program code C, and processor 120 then is coupled to storage device 110, carries out following steps in order to executive routine code C: carry out operating frequency adjustment flow process and select an object run frequency F
TargetAnd use object run frequency F
TargetSet the operating frequency F of storage card 101
OperateWherein the step of executable operations frequency adjustment flow process includes: select a plurality of candidate operations frequency F
Candidate1～F
CandidateN Test storage card 101 is in candidate operations frequency F
Candidate1～F
CandidateNAccess usefulness when operating down is to produce a plurality of test result D respectively
1～D
NAnd according to test result D
1～D
N, F in the candidate operations frequency
Candidate1～F
CandidateNSelect one as object run frequency F
TargetNote that in this embodiment storage device 110 is arranged in the reader device 100 and program code C system is stored in the storage device 110, but this only is the usefulness as the example explanation, is not restriction of the present invention.For instance, storage device 110 also can be arranged at according to design requirement in the computer system, the variation end of this type of design see the program code C that drives reader device 100 is to use firmware and in be built in reader device 100 or use software and be connected with reader device 100 and obtain by an interface (a for example quick peripheral hardware interconnect standard interface).
In this embodiment, storage card 101 is for meeting a safe digital (the Secure Digital of SDA3.0 specification, SD) storage card, and reader device 100 has the operating frequencies such as 25MHz, 50MHz, 100MHz and 208MHz that meet the SDA3.0 specification except providing, also additionally provide three kinds of different operating frequencies such as 125MHz, 156MHz and 178MHz, and above seven kinds of operating frequencies are by the big and little candidate operations frequency F that represents respectively in the operating frequency adjustment flow process
Candidate1～F
Candidate7, that is 208MHz is candidate operations frequency F
Candidate1, 178MHz is candidate operations frequency F
Candidate2..., the rest may be inferred.Note that this embodiment only is used for technical characterictic of the present invention is described, is not to be used for limiting to category of the present invention.In another embodiment, reader device 100 also can provide the operating frequency of other varying number and numerical value as the candidate operations frequency according to different design requirements.When storage card 101 is coupled to reader device 100 and during by 100 accesses of reader device, the processor 120 executable operations frequencies in the reader device 100 are adjusted flow process and come select target operating frequency F
TargetAt first, processor 120 is selected three candidate operations frequency F
Candidate1, F
Candidate2And F
Candidate3(frequency of its representative is respectively 208MHz, 178MHz and 156MHz), then, processor 120 difference test storage cards 101 are in candidate operations frequency F
Candidate1, F
Candidate2And F
Candidate3Access usefulness when operating down is to produce three test result D respectively
1, D
2And D
3As test result D
1, D
2And D
3When difference to each other all falls within the preset range, select test result D
1, D
2And D
3Distinguish corresponding candidate operations frequency F
Candidate1, F
Candidate2, F
Candidate3In minimum operating frequency be used as object run frequency F
Target, that is F
Candidate3As test result D
1, D
2When difference to each other all falls within the preset range, select test result D
1, D
2Distinguish corresponding candidate operations frequency F
Candidate1, F
Candidate2In lower operating frequency be used as object run frequency F
Target, that is F
Candidate2As test result D
2, D
3When difference to each other all falls within the preset range, select test result D
2, D
3Distinguish corresponding candidate operations frequency F
Candidate2, F
Candidate3In lower operating frequency be used as object run frequency F
Target, that is F
Candidate3Otherwise, select candidate operations frequency F
Candidate1, F
Candidate2And F
Candidate3In the highest operating frequency be used as object run frequency F
Target, that is F
Candidate1Please note, in this embodiment, processor 120 is to begin to select three candidate operations frequencies so that storage card 101 is tested toward low operating frequency in regular turn from the highest selectable operating frequency, and whether fall within according to the difference between the test result that is drawn and to come the select target operating frequency in the preset range, but this is not restriction of the present invention, in another embodiment, processor 120 also can select a plurality of operating frequencies to come test storage card 101 arbitrarily, and coming the select target operating frequency according to actual demand and test result, the variation in this type of design also belongs to category of the present invention.
At last, processor 120 uses selected object run frequency F
TargetSet the operating frequency F of storage card 101
Operate, and the object run frequency F that will select
TargetBe recorded in the storage device 110.If storage card 101 is in selected object run frequency F
TargetUnder sequential mistake (Timing Error) takes place when operating, then processor 120 can re-execute operating frequency and adjusts flow process and select other three to be lower than above-mentioned selected object run frequency F
TargetThe candidate operations frequency do test and upgrade object run frequency F
Target, and the object run frequency F after will upgrading
TargetBe recorded in the storage device 110.Thus, when storage card 101 is coupled to reader device 100 and during by 100 accesses of reader device once more, but processor 120 just reads out the object run frequency F that is write down in the self-storing mechanism 110
TargetDirectly set the operating frequency F of storage card 101
Operate, adjust flow process and need not to carry out once more above-mentioned operating frequency, therefore can promote the usefulness of accessing memory card 101.
In another embodiment of the present invention, storage card 101 is a safe digital storage card that meets the SDA2.0 specification, and reader device 100 has the two kinds of operating frequencies such as 25MHz, 50MHz that meet the SDA2.0 specification except providing, five kinds of different operating frequencies such as 83MHz, 100MHz, 125MHz, 156MHz and 178MHz also additionally are provided, more than seven kinds of operating frequencies by little and the big operating frequency of representing is respectively adjusted candidate operations frequency F in the flow process
Candidate1～F
Candidate7, that is 25MHz is candidate operations frequency F
Candidate1, 50MHz is candidate operations frequency F
Candidate2..., the rest may be inferred.When storage card 101 is coupled to reader device 100 and during by 100 accesses of reader device, the processor 120 executable operations frequencies in the reader device 100 are adjusted flow process and come select target operating frequency F
TargetAt first, processor 120 is selected three candidate operations frequency F
Candidate1, F
Candidate2And F
Candidate3(frequency of its representative is respectively 25MHz, 50MHz and 83MHz), then, processor 120 difference test storage cards 101 are in candidate operations frequency F
Candidate1, F
Candidate2And F
Candidate3Access usefulness when operating down is to produce three test result D
1, D
2And D
3As test result D
1, D
2And D
3Difference to each other all falls within the preset range and when all being higher than a particular access efficiency value, selects test result D
1, D
2And D
3Distinguish corresponding candidate operations frequency F
Candidate1, F
Candidate2, F
Candidate3In minimum operating frequency be used as object run frequency F
Target, that is F
Candidate1When test result D is only arranged
2, D
3When being higher than particular access efficiency value difference to each other and all falling within the preset range, select test result D
2, D
3Distinguish corresponding candidate operations frequency F
Candidate2, F
Candidate3In lower operating frequency be used as object run frequency F
Target, that is F
Candidate2When test result D is only arranged
3When being higher than a particular access efficiency value, select test result D
3Pairing candidate operations frequency F
Candidate3Be used as object run frequency F
TargetOtherwise processor 120 re-executes operating frequency adjustment flow process and selects other three candidate operations frequency F
Candidate4, F
Candidate5And F
Candidate6Do test with select target operating frequency F
TargetPlease note, in this embodiment, processor 120 is to begin to select three candidate operations frequencies with test storage card 101 toward higher operating frequency in regular turn from selectable minimum operation frequency, and whether fall within the preset range and be higher than a particular access efficiency value according to the difference between the test result that is drawn and come the select target operating frequency, but this is only as the usefulness of example explanation, is not to be restriction of the present invention.
At last, processor 120 uses selected object run frequency F
TargetSet the operating frequency F of storage card 101
Operate, and the object run frequency F that will select
TargetBe recorded in the storage device 110.Similarly, if storage card 101 in selected object run frequency F
TargetUnder the sequential mistake takes place when operating, then processor 120 re-executes operating frequency and adjusts flow process and upgrade object run frequency F
TargetAnd it is recorded in the storage device 110.Thus, when storage card 101 is coupled to reader device 100 and during by 100 accesses of reader device once more, but processor 120 just reads out the object run frequency F that is write down in the self-storing mechanism 110
TargetDirectly set the operating frequency F of storage card 101
Operate
Please refer to Fig. 2, Fig. 2 is a process flow diagram of setting the operating frequency method of storage card 101 in one embodiment of the invention.Please in the lump with reference to the flow process among the reader device among the figure 1 100 and Fig. 2, the step that the present invention sets the operating frequency method of storage card 101 can briefly be summarized as follows:
Step 200: carry out an operating frequency and adjust flow process.
Step 202: select a plurality of candidate operations frequency F
Candidate1～F
CandidateN
Step 204: test storage card 101 is in candidate operations frequency F
Candidate1～F
CandidateNAccess usefulness when operating down is to produce a plurality of test result D respectively
1～D
N
Step 206: according to test result D
1～D
N, from candidate operations frequency F
Candidate1～F
CandidateNThe middle one of selecting is as an object run frequency F
Target
Step 208: use object run frequency F
TargetSet the operating frequency of storage card 101.
Step 210: the object run frequency F that will select
TargetBe recorded in the storage device 110.
Step 212:, and check that the sequential mistake appears in the access procedure data in storage card 101 enterprising line data accesses? if then re-execute step 200 to upgrade object run frequency F
Target
Read above-mentioned relevant for Fig. 1 in after the explanation of function mode of reader device 100, the person with usual knowledge in their respective areas should understand the details of operation of each step in the method for the operating frequency of setting storage card 101 easily, therefore describes in detail just in this omission.
In sum, the invention provides a kind of method and relevant reader device of operating frequency of setting one storage card.Because the present invention selects a plurality of candidate operations frequencies, and the access usefulness when testing this storage and being stuck under these candidate operations frequencies running produces a plurality of test results respectively, then by analyze and relatively these test results just can select suitable storing card operation frequency.With the safe digital storage card that meets the SDA3.0 specification is example, if under two different candidate operations frequencies, the difference of storage card access usefulness is in a preset range, just can select lower frequency (that is frequency reducing operation) to be used as the storing card operation frequency, thus cpable of lowering power consumption and electromagnetic interference (EMI) phenomenon.If with the safe digital storage card that meets the SDA2.0 specification is example, can in the storage card permissible range, carries out raising frequency and operate and obtain better storage card access usefulness.Therefore, the operating frequency of the adjustment storage card that the present invention can be suitable, and under the situation that does not influence storage card access usefulness effectively reduces power consumption and electromagnetic interference (EMI) phenomenon or increase the access usefulness of storage card in the storage card permissible range.
The above only is preferred embodiment of the present invention, and every equalization of being done according to the present patent application claim changes and modifies, and all should belong to covering scope of the present invention.
Claims (12)
1. a method of setting the operating frequency of storage card is characterized in that, includes:
Carry out an operating frequency and adjust flow process, include:
Select a plurality of candidate operations frequencies;
Access usefulness when testing this storage and being stuck under these a plurality of candidate operations frequencies running is to produce a plurality of test results respectively; And, select an object run frequency certainly in these a plurality of candidate operations frequencies according to these a plurality of test results; And use this object run frequency to set this operating frequency of this storage card.
2. method according to claim 1 is characterized in that, selects the step of this object run frequency to include certainly in these a plurality of candidate operations frequencies:
In these a plurality of test results, have a plurality of fc-specific test FC results, and when its difference to each other all falls within the preset range, select these a plurality of fc-specific test FC results institute respectively in a plurality of operating frequencies of correspondence minimum operating frequency be used as this object run frequency;
Otherwise, select that the highest operating frequency is used as this object run frequency in these a plurality of candidate operations frequencies.
3. method according to claim 1 is characterized in that, selects the step of these a plurality of candidate operations frequencies to include:
Begin to elect toward low operating frequency in regular turn from the highest selectable operating frequency.
4. method according to claim 1 is characterized in that other includes:
When this storage is stuck in when operating under this selected object run frequency the sequential mistake taking place, then re-executes this operating frequency adjustment flow process and upgrade this object run frequency.
5. method according to claim 1 is characterized in that, this operating frequency is adjusted flow process and included this selected object run frequency of this storage card of record in addition.
6. method according to claim 1 is characterized in that, selects the step of these a plurality of candidate operations frequencies to include:
Except the defined all operations frequency of memory card specifications, provide at least one operation bidirectional frequency; And
In all operation bidirectional frequencies and the defined all operations frequency of memory card specifications, select this a plurality of candidate operations frequencies.
7. the reader device in order to accessing memory card is characterized in that, includes:
One storage device stores a program code;
One processor is coupled to this storage device, carries out following steps in order to carry out this program code:
Carry out an operating frequency and adjust flow process, include:
Select a plurality of candidate operations frequencies;
Access usefulness when testing this storage and being stuck under these a plurality of candidate operations frequencies running is to produce a plurality of test results respectively; And
According to these a plurality of test results, select an object run frequency certainly in these a plurality of candidate operations frequencies; And
Use this object run frequency to set an operating frequency of this storage card.
8. reader device according to claim 7 is characterized in that, selects the step of this object run frequency to include certainly in these a plurality of candidate operations frequencies:
In these a plurality of test results, have a plurality of fc-specific test FC results, and when its difference to each other all falls within the preset range, select these a plurality of fc-specific test FC results institute respectively in a plurality of operating frequencies of correspondence minimum operating frequency be used as this object run frequency;
Otherwise, select that the highest operating frequency is used as this object run frequency in these a plurality of candidate operations frequencies.
9. reader device according to claim 7 is characterized in that, selects the step of these a plurality of candidate operations frequencies to include:
Begin to elect toward low operating frequency in regular turn from the highest selectable operating frequency.
10. reader device according to claim 7 is characterized in that, this processor is carried out this program code and can be carried out following steps in addition:
When this storage is stuck in when operating under this selected object run frequency the sequential mistake taking place, then re-executes this operating frequency adjustment flow process and upgrade this object run frequency.
11. reader device according to claim 7 is characterized in that, this operating frequency is adjusted flow process and is included this selected object run frequency of this storage card of record in addition in this storage device; And be coupled to this reader device once more and during by the access of this reader device institute, this processor is carried out this program code and can be carried out following steps in addition when this storage card:
In this storage device, read out this object run frequency that is write down and directly set this operating frequency of this storage card.
12. reader device according to claim 7 is characterized in that, selects the step of these a plurality of candidate operations frequencies to include:
Except the defined all operations frequency of memory card specifications, provide at least one operation bidirectional frequency; And
In all operation bidirectional frequencies and the defined all operations frequency of memory card specifications, select this a plurality of candidate operations frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101185331A CN102147848A (en) | 2010-02-08 | 2010-02-08 | Method for setting operation frequency of storage card and related card reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101185331A CN102147848A (en) | 2010-02-08 | 2010-02-08 | Method for setting operation frequency of storage card and related card reading device |
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| Publication Number | Publication Date |
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| CN102147848A true CN102147848A (en) | 2011-08-10 |
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|---|---|---|---|
| CN2010101185331A Pending CN102147848A (en) | 2010-02-08 | 2010-02-08 | Method for setting operation frequency of storage card and related card reading device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0630024A1 (en) * | 1993-05-19 | 1994-12-21 | Fujitsu Limited | Semiconductor memory device |
| CN1779849A (en) * | 2005-10-09 | 2006-05-31 | 威盛电子股份有限公司 | Access device with power consumption decreasement and access method thereof |
| US20080219078A1 (en) * | 2007-02-28 | 2008-09-11 | Kabushiki Kaisha Toshiba | Memory system and method of controlling the same |
| CN101499124A (en) * | 2008-12-30 | 2009-08-05 | 北京握奇数据系统有限公司 | Method, system and apparatus for read-write operation of smart card |
-
2010
- 2010-02-08 CN CN2010101185331A patent/CN102147848A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0630024A1 (en) * | 1993-05-19 | 1994-12-21 | Fujitsu Limited | Semiconductor memory device |
| CN1779849A (en) * | 2005-10-09 | 2006-05-31 | 威盛电子股份有限公司 | Access device with power consumption decreasement and access method thereof |
| US20080219078A1 (en) * | 2007-02-28 | 2008-09-11 | Kabushiki Kaisha Toshiba | Memory system and method of controlling the same |
| CN101499124A (en) * | 2008-12-30 | 2009-08-05 | 北京握奇数据系统有限公司 | Method, system and apparatus for read-write operation of smart card |
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Application publication date: 20110810 |