CN101764651B - Method and device for realizing signal testing - Google Patents
Method and device for realizing signal testing Download PDFInfo
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- CN101764651B CN101764651B CN2009102445460A CN200910244546A CN101764651B CN 101764651 B CN101764651 B CN 101764651B CN 2009102445460 A CN2009102445460 A CN 2009102445460A CN 200910244546 A CN200910244546 A CN 200910244546A CN 101764651 B CN101764651 B CN 101764651B
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Abstract
The invention discloses a method and a device for realizing signal testing, which can automatically select an optimal read-write signal separating mode and carry out read-write signal separating operation on a received transmission signal by using the selected read-write signal separating mode. The method and the device also can accurately acquire parameters used for testing according to a waveform acquired after the read-write signals are separated and improve the convenience and accuracy of signal testing.
Description
Technical field
The present invention relates to measuring technology, be specifically related to a kind of method and apparatus of realizing signal testing.
Background technology
Along with the development of the communication technology, signal integrity is more crucial for system's interoperability.In order to determine whether signal integrity can be guaranteed, and just need to test signal.In the process that is used for realizing signal testing, the operation of separation read write signal is particularly crucial, uses at present more read-write separation method to mainly contain two kinds: to utilize separation read write signal settling time, utilize signal amplitude separation read write signal; Yet in the situations such as different application scenarioss and system environments, the accuracy of above-mentioned two kinds of read-write separation methods is different.
Therefore, in actual applications, select which kind of read-write separation method more suitable effectively and be not easy to judge actually, often need to by manually repeatedly attempting, cause operating difficulties, the time is long, efficient is low and can only finds that the waveform of limited quantity is used for test.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and apparatus of realizing signal testing, can use automatically, exactly best read-write separation method, to improve convenience and the accuracy of signal testing.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that realizes signal testing, the method comprises:
Select best read-write separate mode, and use selected read-write separate mode the signal transmission that receives is carried out the read-write lock out operation; Resulting waveform after separating according to read-write obtains the parameter for test;
Wherein, select the method for the read-write separate mode of described the best to be:
If the signal amplitude of the transmitting terminal of same signal and receiving terminal has obvious difference, determine to utilize the mode of signal amplitude separation read write signal to be best read-write separate mode;
If difference settling time that reads and writes data has surpassed the time gate limit value that sets in advance, determine to utilize the mode of separation read write signal settling time to be best read-write separate mode.
Before selecting the read-write separate mode of described the best, further statistical analysis receiving terminal wave character.
The method of obtaining for the described parameter of testing is: the waveform of resulting stabilization signal after read-write is separated, bitwise cut the every a slice waveform after being cut to waveform.
Further to the waveform overlap-add procedure of aliging after cutting, then form the eye pattern of the data-signal of needs according to result, and carry out the eye pattern test.
Further the quality of more different read-write separate modes, offer the user with comparative result.
A kind of device of realizing signal testing, this device comprise that connected signal separates decision package, signal separates performance element; Wherein,
Described signal separates decision package, be used for selecting best read-write separate mode, and notice is separated performance element to described signal;
Described signal separates performance element, is used for using the read-write separate mode of knowing the signal transmission that receives is carried out the read-write lock out operation; After separating according to read-write, resulting waveform obtains the parameter for test;
Wherein, described signal separates decision package when selecting best read-write separate mode, is used for:
If the signal amplitude of the transmitting terminal of same signal and receiving terminal has obvious difference, determine to utilize the mode of signal amplitude separation read write signal to be best read-write separate mode;
If difference settling time that reads and writes data has surpassed the time gate limit value that sets in advance, determine to utilize the mode of separation read write signal settling time to be best read-write separate mode.
Comprise that further signal separates trigger element, be used for obtaining the information that to select best read-write separate mode, and this this information is notified to described signal separation decision package;
Described information comprises: level detecting result, settling time test result, application scenarios and system environments.
Further comprise Signal Pretreatment unit, test execution unit; Wherein,
Described Signal Pretreatment unit is used for the Signal Pretreatment that comprises that to the received signal sampling, receiving terminal are judged, and the signal that will complete processing sends to described signal separation decision package;
Described test execution unit is used for carrying out signal testing according to the parameter that is used for test that signal separation performance element obtains.
Described signal separates decision package, is further used for the quality of more different read-write separate modes, and comparative result is offered the user.
As seen, because the inventive method and device all can be selected best read-write separate mode automatically, and use selected read-write separate mode the signal transmission that receives is carried out the read-write lock out operation; Resulting waveform after can also separating according to read-write, Obtaining Accurate is used for the parameter of test, has therefore improved convenience and the accuracy of signal testing.
Description of drawings
Fig. 1 is that the signal receiving end of prior art is judged schematic diagram;
Fig. 2 is the signal sampling schematic diagram of prior art;
Fig. 3 is the schematic diagram that utilizes separation read write signal settling time of prior art;
Fig. 4 is the flow chart of realizing signal testing of the embodiment of the present invention;
Fig. 5 is that the best read-write separate mode in Fig. 4 is the schematic diagram that utilizes signal amplitude to separate;
Fig. 6 is that the best read-write separate mode in Fig. 4 is to utilize the schematic diagram that separates settling time;
Fig. 7 is the general flow chart of realizing signal testing of the present invention;
Fig. 8 is the installation drawing of realizing signal testing of the embodiment of the present invention.
Embodiment
On the invention thinking, provided by the present inventionly realize that the method for signal testing comprises: select best read-write separate mode, and use selected read-write separate mode the signal transmission that receives is carried out the read-write lock out operation; Resulting waveform after separating according to read-write obtains the parameter for test.
The device of realizing signal testing provided by the present invention comprises that connected signal separates decision package, signal separates performance element; Wherein, described signal separates decision package, be used for selecting best read-write separate mode, and notice is separated performance element to described signal; Described signal separates performance element, is used for using the read-write separate mode of knowing the signal transmission that receives is carried out the read-write lock out operation; After separating according to read-write, resulting waveform obtains the parameter for test.
Referring to Fig. 1, Fig. 1 is that the signal receiving end of prior art is judged schematic diagram.As shown in Figure 1, according to the delay of signal transmission, can catch source and the terminal of same signal; Usually with the corresponding end of the signal of rear arrival as receiving terminal.Specific to DDR SDRAM(double data rate (DDR) Synchronous Dynamic Random Access Memory) in test, the signal that the controller termination is received is read signal, and the signal that the DRAM termination is received is write signal.
Referring to Fig. 2, Fig. 2 is the signal sampling schematic diagram of prior art.As shown in Figure 2, for the sample devices that carries out data sampling, the logical triggering of its data sampling usually use " with " logic, trigger data sampling when satisfying logical condition, as: stipulating in the JEDEC standard, is that signal transmission in low level situation is effective in some control signal.
Referring to Fig. 3, Fig. 3 is the schematic diagram that utilizes separation read write signal settling time of prior art.As shown in Figure 3, can set according to code requirement the settling time of read-write, when one of them data of judging a burst transfer were read/write signal, all data in this burst transfer were all read/write signal so.
Below, in conjunction with Fig. 1 to Fig. 3, as an example of Fig. 4 example, the present invention is realized that the technology of signal testing is described.Referring to Fig. 4, Fig. 4 is the flow chart of realizing signal testing of the embodiment of the present invention, and this flow process comprises the following steps:
Step 401: the signal transmission input, and prepare the data that this signal carries are carried out subsequent treatment.
Step 402: statistical analysis receiving terminal wave character, this operating process can comprise sampling, receiving terminal judge trigger, the data storage and read, receiving terminal judgement, level detecting, test settling time etc.
Particularly, when sampling, can use real-time sampling equipment that the DQS of input and source, the terminal of DQ signal are sampled, for subsequent treatment provides initial data.
When triggering, can adopt the simple trigger conditions such as edge, catch abundant waveform, ready for judging receiving terminal.
Afterwards, the data that the signal that samples can be carried are stored with the form of software support, and read the sampled data of storing when needs carry out follow-up test from sample devices.
When carrying out the judgement of receiving terminal, the judgement of receiving terminal can be carried out according to signal transmission delay, with the decision data receiving terminal; And, can also obtain the significant feature of read-write.
When carrying out level detecting, its different level amplitude of the data test that can carry the signal that samples can be obtained follow-up stable waveform for test according to the varying level amplitude that obtains like this.
When carrying out measuring settling time, the DATA signal of each burst transfer of data test that can carry the signal that samples and the settling time of DQS signal, can obtain follow-up stable waveform for test according to the varying level amplitude that obtains like this.
Step 403: select best read-write separate mode, and use selected read-write separate mode and carry out the reading writing information lock out operation.
In actual applications, the read-write separate mode is varied, concrete employ read-write separate mode can be decided according to situations such as application scenarios and system environmentss, and when utilizing signal amplitude separation read write signal, the data that need the increase control signal to be gathered to guarantee are effective; And can obtain stable waveform by predefined logical triggering level.When utilizing settling time during the separation read write signal, user setup interface can be provided, receive the trigger range of the settling time that user arranges to obtain stable read-write by this interface.
As: the both-end of more same signal, when the signal amplitude of finding transmitting terminal (read signal) and receiving terminal (write signal) has obvious difference (such as the amplitude difference greater than 200mV etc.), can determine as shown in Figure 5 to utilize the mode of signal amplitude separation read write signal to be best read-write separate mode.In this case, can increase the validity of the data that one tunnel control signal gathered to guarantee; By select " with " logic and adjust the level of each signal, can obtain respectively stable read-write.The method is applicable to two ends and triggers the different occasion of ability.
Otherwise, for receiving terminal and transmitting terminal, if the amplitude of the data that sample is more or less the same, but differ greatly (such as having surpassed the time gate limit value that sets in advance) settling time that reads and writes data, can determine as shown in Figure 6 to utilize the mode of separation read write signal settling time to be best read-write separate mode, and then can set different settling times for obtaining stable waveform according to different transmission rates.But the method is applicable to signal amplitude, occasion than big difference there is the identical settling time that reads and writes data.
As seen, as long as the both-end of same signal can access sample devices, can analyze signal, selecting best read-write separate mode, and use selected read-write separate mode and carry out the reading writing information lock out operation.
Step 404: resulting waveform after separating according to read-write, carry out eye diagram measurement.
Particularly, can obtain read-write in the twilight sunset mode for a long time and separate rear resulting stabilization signal, and with the signal storage of obtaining.When follow-up needs are analyzed, can call the waveform of the signal of storage, and use software algorithm bitwise waveform to be cut, with the demonstration of drawing successively of each the small pieces waveform after cutting; The overlap-add procedure of can also aliging to the waveform that drawing demonstrates, then form the eye pattern of the data-signal of needs according to result.Afterwards, can be wide to the eye pattern that obtains test eye, eye is high, pupil distance degree, eye intersect than, 1 level, 0 level, extinction ratio, the Q factor etc., the result of testing can also be presented at the below of eye pattern.
Have, quality that can also more different read-write separate modes offers the user with comparative result again, so that the user can freely select read-write separate mode next time, to obtain the test result of user's expectation.
By the above as can be known, flow process shown in Figure 4 can be reduced to as shown in Figure 7.Referring to Fig. 7, Fig. 7 is the general flow chart of realizing signal testing of the present invention, and this flow process comprises the following steps:
Step 710: select best read-write separate mode, and use selected read-write separate mode the signal transmission that receives is carried out the read-write lock out operation.
Step 720: resulting waveform after separating according to read-write, obtain the parameter for test.
As seen, the present invention realizes the method for signal testing, can automatically use best read-write separate mode the signal transmission that receives is carried out the read-write lock out operation, therefore after can separating according to read-write, resulting waveform Obtaining Accurate is used for the parameter of signal testing, has improved convenience and the accuracy of signal testing.
In order to realize smoothly the aforesaid operations process, can carry out setting as shown in Figure 8.Referring to Fig. 8, Fig. 8 is the installation drawing of realizing signal testing of the embodiment of the present invention, this device comprises that connected signal separates trigger element, signal and separates decision package, signal and separate performance element, test execution unit, signal separate performance element also with the Signal Pretreatment unit.
During concrete the application, the Signal Pretreatment unit can to signal comprise sampling, receiving terminal judge trigger, the data storage and read, the Signal Pretreatment of receiving terminal judgement etc., and the signal that will complete processing sends to signal separation decision package; Signal separates trigger element can carry out level detecting, test settling time and obtain application scenarios and system environments etc. signal, and the test result such as level detecting, test settling time and the information such as the application scenarios that obtains and system environments are sent to signal separation decision package.
signal separates decision package can determine best read-write separate mode according to the information of separating trigger element from signal, as: utilize separation read write signal settling time, utilize signal amplitude separation read write signal etc., and send to signal to separate performance element with determined read-write separate mode and from the signal of Signal Pretreatment unit, separate performance element by signal and according to the read-write separate mode of receiving, the signal of receiving is carried out the read-write separating treatment, and after read-write is separated, the result such as resulting waveform sends to the test execution unit, be used for the parameter of test according to the content obtainings such as waveform of receiving by the test execution unit, as: carry out the waveform cutting, with each the small pieces waveform demonstration of drawing successively after cutting, the overlap-add procedure of can also aliging to the waveform that drawing demonstrates, then form the eye pattern of the data-signal of needs according to result, afterwards, can be wide to the eye pattern that obtains test eye, eye is high, pupil distance degree, eye intersect than, 1 level, 0 level, extinction ratio, the Q factor etc., the result of testing can also be presented at the below of eye pattern.
Have again, signal separates the quality that decision package can also more different read-write separate modes, by modes such as display interfaces, comparative result is offered the user, so that the user can freely select read-write separate mode next time, to obtain the test result of user's expectation.
Operating in aforementioned each figure that in Fig. 8, each functional entity is achieved described in detail, do not repeat them here.
In sum as seen, no matter be method or device, the technology of the present invention all can be selected best read-write separate mode automatically, and uses selected read-write separate mode the signal transmission that receives is carried out the read-write lock out operation; Resulting waveform after can also separating according to read-write, Obtaining Accurate is used for the parameter of test, has improved convenience and the accuracy of signal testing.
The above is only preferred embodiment of the present invention, is not for limiting protection scope of the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a method that realizes signal testing, is characterized in that, the method comprises:
Select best read-write separate mode, and use selected read-write separate mode the signal transmission that receives is carried out the read-write lock out operation; Resulting waveform after separating according to read-write obtains the parameter for test;
Wherein, select the method for the read-write separate mode of described the best to be:
If the signal amplitude of the transmitting terminal of same signal and receiving terminal has obvious difference, determine to utilize the mode of signal amplitude separation read write signal to be best read-write separate mode;
If difference settling time that reads and writes data has surpassed the time gate limit value that sets in advance, determine to utilize the mode of separation read write signal settling time to be best read-write separate mode.
2. method according to claim 1, is characterized in that, before selecting the read-write separate mode of described the best, and further statistical analysis receiving terminal wave character.
3. method according to claim 1, is characterized in that, the method for obtaining for the described parameter of testing is: the waveform of resulting stabilization signal after read-write is separated, bitwise cut the every a slice waveform after being cut to waveform.
4. method according to claim 3, is characterized in that, further to the waveform overlap-add procedure of aliging after cutting, then forms the eye pattern of the data-signal of needs according to result, and carry out the eye pattern test.
5. method according to claim 1, is characterized in that, further the quality of more different read-write separate modes, offer the user with comparative result.
6. a device of realizing signal testing, is characterized in that, this device comprises that connected signal separates decision package, signal separates performance element; Wherein,
Described signal separates decision package, be used for selecting best read-write separate mode, and notice is separated performance element to described signal;
Described signal separates performance element, is used for using the read-write separate mode of knowing the signal transmission that receives is carried out the read-write lock out operation; After separating according to read-write, resulting waveform obtains the parameter for test;
Wherein, described signal separates decision package when selecting best read-write separate mode, is used for:
If the signal amplitude of the transmitting terminal of same signal and receiving terminal has obvious difference, determine to utilize the mode of signal amplitude separation read write signal to be best read-write separate mode;
If difference settling time that reads and writes data has surpassed the time gate limit value that sets in advance, determine to utilize the mode of separation read write signal settling time to be best read-write separate mode.
7. device according to claim 6, is characterized in that, comprises that further signal separates trigger element, is used for obtaining the information that can select best read-write separate mode, and this information notified to described signal separated decision package;
Described information comprises: level detecting result, settling time test result, application scenarios and system environments.
8. according to claim 6 or 7 described devices, is characterized in that, further comprises Signal Pretreatment unit, test execution unit; Wherein,
Described Signal Pretreatment unit is used for the Signal Pretreatment that comprises that to the received signal sampling, receiving terminal are judged, and the signal that will complete processing sends to described signal separation decision package;
Described test execution unit is used for carrying out signal testing according to the parameter that is used for test that signal separation performance element obtains.
9. device according to claim 6, is characterized in that, described signal separates decision package, is further used for the quality of more different read-write separate modes, and comparative result is offered the user.
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| CN101196856A (en) * | 2008-01-04 | 2008-06-11 | 太原理工大学 | Double-port access single dynamic memory interface |
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| CN101196856A (en) * | 2008-01-04 | 2008-06-11 | 太原理工大学 | Double-port access single dynamic memory interface |
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| Title |
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| 基于Infiniium MSO9000系列示波器的DDR总线测试方案;马卓凡;《国外电子测量技术》;20091130;第10-16页 * |
| 马卓凡.基于Infiniium MSO9000系列示波器的DDR总线测试方案.《国外电子测量技术》.2009,第10-16页. |
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