CN102193496A - Method for detecting real time clock (RTC) oscillator and calculator system - Google Patents
Method for detecting real time clock (RTC) oscillator and calculator system Download PDFInfo
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- CN102193496A CN102193496A CN2010101283461A CN201010128346A CN102193496A CN 102193496 A CN102193496 A CN 102193496A CN 2010101283461 A CN2010101283461 A CN 2010101283461A CN 201010128346 A CN201010128346 A CN 201010128346A CN 102193496 A CN102193496 A CN 102193496A
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Abstract
The invention discloses a method for detecting a real time clock (RTC) oscillator. The method is characterized by comprising the following steps of: within a sampling time according to a central processing unit (CPU) inner frequency oscillator serving as a timing basis, acquiring an actual oscillation frequency n of the CPU inner frequency oscillator; acquiring an actual oscillation frequency m of the CPU inner frequency oscillator within the sampling time according to the CPU inner frequency oscillator serving as the timing basis; subtracting n from m so as to obtain a first difference value; judging whether the first difference value exceeds a standard range; and generating a first message according to a judgment result. By the method, the quality of the RTC oscillator on a circuit board or a mainboard can be detected.
Description
Technical field
The present invention is relevant with the detection technique of circuit board, especially with the method and the computer system that are used to detect a RTC oscillator.
Background technology
Many electronic products are such as personal computer, portable computer, mobile phone, personal digital assistant ... or the like, all dispose a real time clock circuit (Real TimeClock is hereinafter to be referred as RTC) on its circuit board.Conventional, it is the quartz (controlled) oscillator (to call the RTC oscillator in the following text) of 32768Hz that described RTC is to use oscillation frequency, and just its energy per second produces 32768 times vibration.This RTC oscillator be subjected to easily temperature effect and/or, be subjected to the influence of some processing procedure factors of described RTC oscillator, make its oscillation frequency that produces that some errors be arranged, conventional, approximately+20ppm (soon) or-error of 20ppm (slowly) is to be allowed to.
Because the existence of described error makes the electronic product with RTC after being used a period of time by the consumer, will the inaccurate situation of time of origin, this needs consumer oneself to go to proofread and correct usually.Such as the RTC on the computer main frame panel, the one station server time of carrying out that can connect on the network upgrades, for example utilize the built-in internet time synchronized mechanism of Windows XP, from the time.windows.com server, obtain a standard time, and the RTC time on the described motherboard to be measured is updated to the described standard time.In addition, also having some modes is to proofread and correct the RTC time, for example Taiwan M323062 " means for correcting and use its clock apparatus ", Taiwan 200839483 " instant clock pulse bearing calibration and device ", Taiwan I317857 " upgrade the method for the timing time of baseboard management controller ", Taiwan 200742976 " electronic installation and adjust instant time method " and the U.S. 6,304, the technology of being mentioned in the patent cases such as 517B1.
From above-mentioned explanation as can be known, the RTC oscillator on the circuit board, its actual oscillation frequency will depart from its specified oscillation frequency and accurately little originally, as long as the time error that is caused is still in admissible standard, described RTC oscillator still can be considered non-defective unit.Yet in case the time error that inaccurate problem caused that described RTC oscillator had both been deposited exceeds admissible standard, described RTC oscillator promptly belongs to defective products and should be detected before product export.
Mentioning technology in above-mentioned each patent case, is not to be designed to detect whether a RTC oscillator is non-defective unit before product export, in fact can't be used to detect the RTC oscillator on the circuit board (for example computer main frame panel) yet.
Summary of the invention
The invention provides a kind of method that is used to detect a RTC oscillator, it comprises carries out one first trace routine, it is in the sampling time on timing basis that described first trace routine is characterized in that being included in frequency oscillator in the CPU, obtains the actual number of oscillation n of frequency oscillator in the described sampling time in the described CPU.Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation m of frequency oscillator in the described sampling time in the described CPU.Described n and m are subtracted each other, to obtain one first difference.Judge whether described first difference exceeds a critical field.Produce one first message according to judged result.
Preferably, described first trace routine is characterized in that also comprising carries out computing with the described first difference substitution, one formula, obtains a numerical value with computing, and makes described first message comprise described numerical value.Wherein, described numerical value is represented the actual oscillation frequency of described RTC oscillator.
Preferably, the inventive method also comprises carries out one second trace routine, and it is in the sampling time on timing basis that described second trace routine is characterized in that being included in described RTC oscillator, obtains the actual number of oscillation of frequency oscillator in the described CPU for the first time.Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the second time.The number of oscillation that obtains for the first time and the number of oscillation that obtains are for the second time subtracted each other, to obtain one second difference.When described second difference is not 0, judge that promptly the actual oscillation frequency of described RTC oscillator takes place to float.Produce one second message according to judged result.
The present invention also provides a kind of computer system, it is characterized in that having a central processing unit and a test procedure, whether described test procedure can make described central processing unit carry out one first above-mentioned trace routine, be offset in order to the actual oscillation frequency that detects described RTC oscillator to exceed a critical field.Wherein, whether described test procedure can also make described central processing unit carry out one second trace routine, float in order to the actual oscillation frequency that detects described RTC oscillator.
As for other technical characterictic of the present invention and function thereof, with the explanation that is exposed in subsequently.
Description of drawings
Fig. 1 shows a preferred example of computer system of the present invention for calcspar.
Fig. 2 is first trace routine in process flow diagram demonstration the inventive method.
Fig. 3 is second trace routine in process flow diagram demonstration the inventive method.
Embodiment
Fig. 1 shows a preferred example of computer system of the present invention, described computer system comes down to a personal computer or portable computer, it is characterized in that mainly comprising a central processing unit 1 (CPU), a motherboard 2, a display 3, a keyboard 4, a mouse 5, a hard disk 6 and a test procedure 7.Be equipped with a described central processing unit 1 and a random access memory device 20 on the described motherboard 2, and contain frequency oscillator 10, a real time clock circuit 21 (Real Time Clock is hereinafter to be referred as RTC) and a RTC oscillator 22 in the CPU at least.Frequency oscillator 10 is to be used for producing described central processing unit 1 needed frequency of operation in the described CPU.The specified oscillation frequency of oscillator 10 is higher frequently in the CPU that the high-grade central processing unit 1 of healing is arranged in pairs or groups.Described RTC 21 is integrated in the South Bridge chip.Described RTC oscillator 22 is to be used to produce described RTC 21 needed frequency of operation, and its specified oscillation frequency is 32768HZ normally.
Described RTC oscillator 22 is detected objects, and according to research, following two kinds of situations might take place for it, causes to obtain the RTC time according to described RTC oscillator 22 computings and exist inaccurate problem.
Skew has taken place in the actual oscillation frequency that first kind of situation is described RTC oscillator 22.This is meant that the actual oscillation frequency that described RTC oscillator 22 is produced may be to be greater than or less than its specified oscillation frequency regularly when running, the RTC oscillator 22 that for example specified oscillation frequency is 32768HZ, should be per second vibration 32768 times in theory, but the actual per second number of oscillation may be greater or less than these several fixed values, the possibility of result of accumulative total makes the approximately fast or slow several seconds of one day RTC time, for example the per second number of oscillation is fast or slow 0.65536 time, add up be one day fast or slow 1.728 seconds.
The actual oscillation frequency that second kind of situation is described RTC oscillator 22 has taken place to float.This be meant actual oscillation frequency that described RTC oscillator 22 time produced in running may be suddenly greater than or neglect less than its specified oscillation frequency, with the example in the leading portion is example, described RTC oscillator 22 is when actual operation, in this second may be to have vibrated 0.5 time more, but in next second may be to have lacked 0.6 time, may lack 0.4 time again ... suchlike again.
As shown in Figures 1 to 3, described test procedure 7 has been loaded described random access memory device 20 for described central processing unit 1 execution from described hard disk 6.Whether described test procedure 7 can make described central processing unit 1 execution first trace routine as shown in Figure 2, be offset in order to the actual oscillation frequency that detects described RTC oscillator 22 to exceed a critical field.Preferably, whether second trace routine that described test procedure 7 can also make described central processing unit 1 carry out as shown in Figure 2 floats in order to the actual oscillation frequency that detects described RTC oscillator 22.
As shown in Figure 2, described first trace routine comprises:
As step 80, oscillator 10 is in the sampling time on timing basis frequently in described CPU, for example 1 second, obtains the actual number of oscillation n of frequency oscillator 10 in the described sampling time in the described CPU.The specified oscillation frequency of supposing frequency oscillator 10 in the described CPU is 2.6G HZ, so, in that 1 second, frequently the actual number of oscillation of oscillator 10 vibrate exactly 2,600,000,000 times (if not having error) in the described CPU, at this, do not list the number of oscillation below the myriabit number in consideration, then can be considered the interior oscillator 10 frequently of described CPU and in that 1 second, vibrated 260,000 times.Please noting at this or mention in the described CPU number of oscillation of oscillator 10 frequently subsequently, all is to omit below the myriabit number.
In brief, in step 80 so-called 1 second, in the described exactly CPU frequently oscillator 10 vibrated 260,000 times, to described RTC oscillator 22 subsequently, this will be the standard time by in the described CPU 1 second of 10 timing of oscillator frequently.
As step 81, in the described sampling time that is the timing basis with described RTC oscillator 22 (promptly 1 second), obtain the actual number of oscillation m of frequency oscillator 10 in the described sampling time in the described CPU.If the oscillation frequency of described RTC oscillator 22 does not have above-mentioned skew or unsteady phenomenon to take place, words very accurately just, then in that 1 second, the actual number of oscillation m of oscillator 10 frequently in the described CPU, should be the actual number of oscillation n that equals obtained in the step 80, promptly 260,000 times.Yet, if described RTC oscillator 22 is inaccurate, 1 second of obtaining of 22 timing of then described RTC oscillator, certainly inaccurate, so that can be greater or less than with 10 timing to 1 of oscillator frequently in the described CPU second, in other words, in 1 second of 22 timing of described RTC oscillator, the actual number of oscillation m of oscillator 10 should be able to be greater or less than oscillator 10 obtained actual number of oscillation n in step 80 frequently in the described CPU frequently in the described CPU.
The specified oscillation frequency of supposing described RTC oscillator 22 is 32768HZ, but because the cause of frequency shift (FS), the actual oscillation frequency that is showed during its actual operation may be 32766.461538HZ, 32782.615385HZ..., 1 second of coming out of 22 timing of RTC oscillator of different actual oscillation frequency, its real time span is all different, so in the described CPU frequently the actual number of oscillation m in the oscillator 10 come out in 22 timing of the RTC of different actual oscillation frequency oscillator 1 second also can have nothing in common with each other, these actual number of oscillation m subtract each other the gained difference with the actual number of oscillation n of frequency oscillator 10 in CPU described in the step 80 and also have nothing in common with each other certainly, these differences all are the results who subtracts each other with m for ten thousand times with n=26, so be called desirable difference, yet, in fact if error is included in, n may be greater or less than 260,000 times, for example many 3 times, result with the n that includes error in subtracts each other with m just is called actual difference.In the middle of following table, show described RTC oscillator 22 when different actual oscillation frequency, the desirable difference and the actual difference of its correspondence.
| The actual oscillation frequency of RTC oscillator 22 (HZ) | Actual difference | Desirable difference |
| 32576.153846 | -1247 | -1250 |
| 32608.769231 | -1035 | -1038 |
| 32641.230769 | -824 | -827 |
| 32673.692308 | -613 | -616 |
| 32706.000000 | -403 | -406 |
| 32738.307692 | -193 | -196 |
| 32754.461538 | -88 | -91 |
| 32762.461538 | -36 | -39 |
| 32766.461538 | -10 | -13 |
| 32768.461538 | 3 | 0 |
| 32770.461538 | 16 | 13 |
| 32774.461538 | 42 | 39 |
| 32782.615385 | 95 | 92 |
| 32798.615385 | 199 | 196 |
| 32830.769231 | 408 | 405 |
| 32862.923077 | 617 | 614 |
| 32894.769231 | 824 | 821 |
| 32926.769231 | 1032 | 1029 |
| 32958.615385 | 1239 | 1236 |
In the middle of last table, when the actual oscillation frequency 32768.461538HZ of described RTC oscillator 22, its corresponding actual difference is 3, and desirable difference is 0.At this moment, be that described RTC oscillator 22 is accurately, because with in 1 second of 22 timing of described RTC oscillator, the actual number of oscillation m of frequency oscillator 10 equals 260,000 times in the described CPU, just 1 second of 22 timing of described RTC oscillator at this moment, be the equal of in the described CPU 1 second of 10 timing of oscillator frequently, both time spans are identical and do not have respectively, also therefore make that desirable difference is 0.
Can derive a linear formula: y=2/ (13x+32768) according to last table.Wherein, the actual oscillation frequency of y:RTC oscillator 22 (HZ), x: actual difference.So in case obtain described actual difference x, just formula to calculating goes out the actual oscillation frequency of described RTC oscillator 22 according to this.
If described RTC oscillator 22 comes the timing one day can be than more than a day or lack 3 seconds and be can received deviation really, standard according to this, when the specified oscillation frequency of described RTC oscillator 22 is 32768HZ, the actual oscillation frequency of just representing described RTC oscillator 22 is below 32766.862HZ or 32769.138HZ when above, all should be considered as defective products, so all actual difference are equal to or less than-10 in the last table, and be equal to or greater than-16, all be the defective products that exceeds critical field.So, as long as can get described actual difference x, just can to judge described RTC oscillator 22 as standard be non-defective unit or defective products according to aforesaid.
As step 82, described n and m are subtracted each other, to obtain one first difference, just above-mentioned actual difference x.
As step 83, judge whether described first difference exceeds above-mentioned critical field, promptly.The actual oscillation frequency of just representing described RTC oscillator 22 in case go beyond the scope has been displaced to and has exceeded admissible scope.Because step 80 can be carried out simultaneously with 81, so the only use expense just can check out whether the actual oscillation frequency of described RTC oscillator 22 is displaced in 1 second and exceed admissible scope that inspection speed is quite quick.
As step 84, produce one first message according to judged result, whether described first message can be sound or is presented at literal or pattern on the described display 3, be offset in order to the actual oscillation frequency of pointing out described RTC oscillator 22.
Further, as step 85, the described first difference substitution, one formula is carried out computing, obtain a numerical value with computing, described numerical value is represented the actual oscillation frequency of described RTC oscillator 22, and wherein said formula is above-mentioned linear formula.
As step 86, make described first message comprise described numerical value.So, not only can notify the described RTC oscillator 22 of representative whether to lead to the message that detects, can also notify the actual oscillation frequency of described RTC oscillator 22.
As shown in Figure 3, described second trace routine comprises:
As step 90, be in the sampling time on timing basis with described RTC oscillator 22, for example 1 second, obtain the interior actual number of oscillation of oscillator 10 frequently of described CPU for the first time.
As step 91, in the described sampling time that is the timing basis with described RTC oscillator 22 (promptly 1 second), obtain the actual number of oscillation of frequency oscillator 10 in the described CPU for the second time.
As step 92, the number of oscillation that obtains for the first time and the number of oscillation that obtains are for the second time subtracted each other, to obtain one second difference.
As step 93,, judge that promptly the actual oscillation frequency of described RTC oscillator 22 takes place to float when described second difference is not 0.Because, if the actual oscillation frequency of described RTC oscillator 22 is stable, 1 second of its institute's timing each time so, its real time span should be identical, just the number of oscillation that obtains for the first time should be identical with the number of oscillation that obtains for the second time, resultant second difference just should be 0, be not 0 with regard to the actual oscillation frequency of representing described RTC oscillator 22 be suddenly neglect soon slow.This process only use takes 2 seconds, and inspection speed is quite quick.
As step 94, produce one second message according to judged result, whether described second message can be sound or is presented at literal or pattern on the described display 3, float in order to the actual oscillation frequency of pointing out described RTC oscillator 22.
As seen from the above description, said method of the present invention and computer system, it is a RTC oscillator that can be used to detect on a circuit board or the motherboard, and can check out in 1 second that those actual oscillation frequency have been offset the RTC oscillator that exceeds permissible range, and can in 2 seconds, check out the RTC oscillator that those actual oscillation frequency have been floated.This does not only see known technology and the tool novelty, and the practicality on the really dark tool industry is now filed an application with creative in accordance with the law.
Claims (9)
1. a method that is used to detect a RTC oscillator comprises and carries out one first trace routine, and described first trace routine is characterized in that comprising the following steps:
Frequently oscillator is in the sampling time on timing basis in a CPU, obtains the actual number of oscillation n of frequency oscillator in the described sampling time in the described CPU;
Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation m of frequency oscillator in the described sampling time in the described CPU;
Described n and m are subtracted each other, to obtain one first difference;
Judge whether described first difference exceeds a critical field; And
Produce one first message according to judged result, described first message is to be used to point out whether the actual oscillation frequency of described RTC oscillator is offset.
2. in accordance with the method for claim 1, described first trace routine is characterized in that also comprising:
The described first difference substitution, one formula is carried out computing, obtain a numerical value with computing, described numerical value is represented the actual oscillation frequency of described RTC oscillator; And
Make described first message comprise described numerical value.
3. in accordance with the method for claim 1, comprise also and carry out one second trace routine that described second trace routine is characterized in that comprising the following steps:
Be in the sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the first time;
Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the second time;
The number of oscillation that obtains for the first time and the number of oscillation that obtains are for the second time subtracted each other, to obtain one second difference;
When described second difference is not 0, judge that promptly the actual oscillation frequency of described RTC oscillator takes place to float; And
Produce one second message according to judged result, whether described second message is to float in order to the actual oscillation frequency of pointing out described RTC oscillator.
4. computer system is characterized in that comprising:
One central processing unit (CPU);
Frequently oscillator in one CPU is to be used to supply described central processing unit needed frequency of operation, and it has one specified;
One real-time clock (RTC);
One RTC oscillator is to be used to supply described real-time clock needed frequency of operation;
One random access memory device (RAM); And
One test procedure, be to be used to be loaded described random access memory device carry out for described central processing unit, whether described test procedure can make described central processing unit carry out one first trace routine, be offset in order to the actual oscillation frequency that detects described RTC oscillator to exceed a critical field.
5. according to the described computer system of claim 4, it is characterized in that whether described test procedure can also make described central processing unit carry out one second trace routine, float in order to the actual oscillation frequency that detects described RTC oscillator.
6. according to the described computer system of claim 4, wherein said first trace routine is characterized in that comprising the following steps:
Frequently oscillator is in the sampling time on timing basis in described CPU, obtains the actual number of oscillation n of frequency oscillator in the described sampling time in the described CPU;
Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation m of frequency oscillator in the described sampling time in the described CPU;
Described n and m are subtracted each other, to obtain one first difference;
Judge whether described first difference exceeds a critical field; And
Produce one first message according to judged result, described first message is to be used to point out whether the actual oscillation frequency of described RTC oscillator is offset.
7. according to the described computer system of claim 6, wherein said first trace routine is characterized in that also comprising:
The described first difference substitution, one formula is carried out computing, obtain a numerical value with computing, described numerical value is represented the actual oscillation frequency of described RTC oscillator; And
Make described first message comprise described numerical value.
8. according to the described computer system of claim 5, wherein said second trace routine is characterized in that comprising the following steps:
Be in the sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the first time;
Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the second time;
The number of oscillation that obtains for the first time and the number of oscillation that obtains are for the second time subtracted each other, to obtain one second difference;
When described second difference is not 0, judge that promptly the actual oscillation frequency of described RTC oscillator takes place to float; And
Produce one second message according to judged result, whether described second message is to float in order to the actual oscillation frequency of pointing out described RTC oscillator.
9. according to the described computer system of claim 6, wherein said test procedure can also make described central processing unit carry out one second trace routine, and this described second trace routine is characterized in that comprising the following steps:
Be in the sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the first time;
Be in the described sampling time on timing basis with described RTC oscillator, obtaining the actual number of oscillation of frequency oscillator in the described CPU for the second time;
The number of oscillation that obtains for the first time and the number of oscillation that obtains are for the second time subtracted each other, to obtain one second difference;
When described second difference is not 0, judge that promptly the actual oscillation frequency of described RTC oscillator takes place to float; And
Produce one second message according to judged result, whether described second message is to float in order to the actual oscillation frequency of pointing out described RTC oscillator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113000416A (en) * | 2021-02-05 | 2021-06-22 | 上海华虹宏力半导体制造有限公司 | Test screening method of oscillator circuit module |
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| CN1825065A (en) * | 2005-02-23 | 2006-08-30 | 盛群半导体股份有限公司 | Temp. compensating circuit and method |
| CN1909375A (en) * | 2005-08-03 | 2007-02-07 | 乐金电子(中国)研究开发中心有限公司 | Real-time clock device and current time compensating method |
| US20090316847A1 (en) * | 2008-06-19 | 2009-12-24 | Microchip Technology Incorporated | Automatic Synchronization of an Internal Oscillator to an External Frequency Reference |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573354A (en) * | 2003-06-10 | 2005-02-02 | 日本电气株式会社 | Portable terminal and GPS time keeping method |
| CN1825065A (en) * | 2005-02-23 | 2006-08-30 | 盛群半导体股份有限公司 | Temp. compensating circuit and method |
| CN1909375A (en) * | 2005-08-03 | 2007-02-07 | 乐金电子(中国)研究开发中心有限公司 | Real-time clock device and current time compensating method |
| US20090316847A1 (en) * | 2008-06-19 | 2009-12-24 | Microchip Technology Incorporated | Automatic Synchronization of an Internal Oscillator to an External Frequency Reference |
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| CN113000416A (en) * | 2021-02-05 | 2021-06-22 | 上海华虹宏力半导体制造有限公司 | Test screening method of oscillator circuit module |
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