CN111367730A - USB interface test system and code pattern switching device thereof - Google Patents
USB interface test system and code pattern switching device thereof Download PDFInfo
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- CN111367730A CN111367730A CN202010107284.XA CN202010107284A CN111367730A CN 111367730 A CN111367730 A CN 111367730A CN 202010107284 A CN202010107284 A CN 202010107284A CN 111367730 A CN111367730 A CN 111367730A
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- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 230000008054 signal transmission Effects 0.000 claims abstract description 20
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test buses, lines or interfaces, e.g. stuck-at or open line faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2273—Test methods
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Abstract
The invention discloses a code pattern switching device, because a calibration signal output interface of an oscilloscope can also output a pulse signal for triggering a USB interface to switch the code pattern, and the voltage value of the pulse signal is lower, an attenuator is not required to be additionally arranged between the oscilloscope and a USB interface to be tested, so that the cost is saved, and the calibration signal output interface is usually arranged on a front panel of the oscilloscope, so that the connection of a signal transmission line is facilitated. The invention also discloses a USB interface test system which has the same beneficial effects as the code type switching device.
Description
Technical Field
The invention relates to the field of computers, in particular to a code pattern switching device and a USB interface test system.
Background
A USB (Universal Serial Bus) interface is a common data transmission interface in daily life, and in a development stage of the USB interface, the USB interface is usually tested for signal quality, and the whole test process needs to test multiple code patterns (e.g. LFPS (Low Frequency periodic signal, etc.) of an output signal of the USB interface, so as to solve the problem of switching the code pattern of the output signal of the USB interface in the test process, in the prior art, a pulse signal with a preset Frequency is usually output through an AUX OUT (audio source output) interface of an oscilloscope to trigger the USB interface to switch the code pattern, but the voltage of the pulse signal output by the AUX OUT interface is higher (usually 1.6V), so that an attenuator needs to be connected between the AUX OUT interface and the USB interface to reduce the voltage, thereby preventing damage to related devices, due to the use of the attenuator, the cost is high, and the AUX OUT interface is usually arranged on the rear panel of the oscilloscope, so that the connection difficulty is high.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a code type switching device, which saves cost and is convenient for connecting signal transmission lines; another object of the present invention is to provide a code pattern switching apparatus including the above code pattern switching apparatus, which is cost-effective and facilitates connection of signal transmission lines.
To solve the above technical problem, the present invention provides a pattern switching apparatus, comprising:
the oscilloscope is used for outputting a pulse signal for triggering the USB interface to switch the code pattern through a self calibration signal output interface;
the signal transmission line is used for transmitting the pulse signal to the USB interface to be tested so as to switch the code pattern of the output signal of the USB interface to be tested.
Preferably, the pattern switching device further includes:
the USB interface clamp is used for fixing the USB interface to be tested and transmitting the pulse signal to the pin of the USB interface to be tested.
Preferably, the pattern switching device further includes:
and the prompting device is connected with the calibration signal output interface and used for prompting that the pulse signal is output when the pulse signal is received.
Preferably, the prompting device is a light emitting diode.
Preferably, the calibration signal output interface is a Fast Edge output interface.
Preferably, the signal transmission line is a dupont line or a tin wire.
Preferably, the frequency of the pulse signal is 100 MHz.
Preferably, the code pattern of the output signal of the USB interface to be tested includes low-frequency periodic signals LFPS, CP0, and CP 1.
In order to solve the above technical problem, the present invention further provides a USB interface testing system, which includes a USB interface to be tested, and further includes the code pattern switching device as described in any one of the above.
The invention provides a code pattern switching device, because a calibration signal output interface of an oscilloscope can also output a pulse signal for triggering a USB interface to switch the code pattern, and the voltage value of the pulse signal is lower, an attenuator is not required to be additionally arranged between the oscilloscope and a USB interface to be tested, so that the cost is saved, and the calibration signal output interface is usually arranged on a front panel of the oscilloscope, so that the connection of a signal transmission line is facilitated.
The invention also provides a USB interface test system which has the same beneficial effects as the code type switching device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a code pattern switching apparatus provided in the present invention;
fig. 2 is a schematic structural diagram of another code pattern switching apparatus provided in the present invention.
Detailed Description
The core of the invention is to provide a code type switching device, which saves the cost and is convenient for the connection of signal transmission lines; the other core of the invention is to provide a code pattern switching device which saves cost and is convenient for connecting signal transmission lines.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a code pattern switching apparatus according to the present invention, including:
the oscilloscope 1 is used for outputting a pulse signal for triggering the USB interface to switch the code pattern through a self calibration signal output interface;
the signal transmission line 2 is connected with the calibration signal output interface at the first end and the USB interface of the universal serial bus to be tested at the second end, and is used for transmitting the pulse signal to the USB interface to be tested so as to switch the code pattern of the output signal of the USB interface to be tested.
Specifically, the calibration signal output interface itself is used to calibrate the relevant parameters of the oscilloscope 1, and it may send a standard signal pulse to the signal receiving channel of the oscilloscope 1 so as to calibrate the relevant parameters.
Specifically, in view of the technical problems in the background art, the applicant finds through tests that the calibration signal output interface of the oscilloscope 1 can also send a pulse signal for triggering the USB interface to switch the code pattern, and the voltage value of the pulse signal is low, and the calibration signal output interface is usually located on the front panel of the oscilloscope 1, which is convenient for the connection of the signal transmission line 2, so that in the application, the calibration signal output interface and the USB interface to be tested can be connected together through the signal transmission line 2 without arranging an attenuator, thereby reducing the cost.
Specifically, there may be a plurality of code patterns of the output signal of the USB interface, which is not limited in this embodiment of the present invention, and after receiving the pulse signal, the USB interface to be tested may switch the code patterns according to a preset sequence, for example, switch the code patterns one by one according to a switching sequence of an a code pattern, a B code pattern, and a C code pattern, which is not limited in this embodiment of the present invention.
The invention provides a code pattern switching device, because a calibration signal output interface of an oscilloscope can also output a pulse signal for triggering a USB interface to switch the code pattern, and the voltage value of the pulse signal is lower, an attenuator is not required to be additionally arranged between the oscilloscope and a USB interface to be tested, so that the cost is saved, and the calibration signal output interface is usually arranged on a front panel of the oscilloscope, so that the connection of a signal transmission line is facilitated.
For better explaining the embodiment of the present invention, please refer to fig. 2, fig. 2 is a schematic structural diagram of another code pattern switching apparatus provided by the present invention, and on the basis of the above embodiment:
as a preferred embodiment, the pattern switching device further includes:
the USB interface clamp 3 is used for fixing the USB interface to be tested and transmitting the pulse signal to the pin of the USB interface to be tested.
At present, the physical layer test based on the USB3.0 interface is performed by USB3.0TX physical layer test mainly through the test fixture issued by USB-IF (Universal Serial bus implementers Forum, non-profit organization USB design society). The USB3.0TX test is divided into LFPS, CP0 and CP1 test, which also needs to switch three patterns during the test. This relates to the question of how to control whether the USB3.0 signal is in LFPS, CP0 or CP 1. The current mainstream method for switching the USB3.0 test code pattern is to use an AUX OUT interface behind an oscilloscope 1 to trigger a waveform and switch the code pattern. The switch LFP > CP0 > CP1 is triggered by the "AUX OUT" of oscilloscope 1. Rx-on the clamp is short-circuited by a 50 ohm resistor, and Rx + passes through an attenuator of 12dB and is connected with an AUX OUT interface of a rear panel of the oscilloscope 1 through a BNC cable. The attenuator is added for safety because the voltage of the AUX OUT output trigger signal is up to 1.6V.
Specifically, the USB interface clamp 3 may be configured to lead out a pin of the USB interface to be tested, so as to facilitate connection of the signal transmission line 2, and may fix the USB interface to be tested, so as to facilitate signal testing.
It should be noted that, in the embodiment of the present invention, the second end of the signal transmission line 2 may not be connected to the USB interface to be tested.
As a preferred embodiment, the pattern switching device further includes:
and the prompting device 4 is connected with the calibration signal output interface and is used for prompting that the pulse signal is output when the pulse signal is received.
Specifically, when the calibration signal output interface outputs a pulse signal, the prompting device 4 connected with the calibration signal output interface can receive the pulse signal simultaneously with the signal transmission line 2, the prompting device 4 can prompt that the pulse signal is being output at the moment, and a worker can assist the USB interface to switch the code pattern through the clamp after receiving the prompt of the prompting device 4.
In addition, after receiving the prompt of the prompt device 4, the worker can also actively check whether the code pattern of the USB interface to be tested is successfully switched, and if the code pattern of the USB interface to be tested is not successfully switched, the worker can overhaul the signal transmission line 2 or the USB interface so as to find out and remove the fault in time.
As a preferred embodiment, the prompting device 4 is a light emitting diode.
Specifically, the light emitting diode has the advantages of small volume, low cost, simple structure and the like.
Of course, the prompting device 4 may be of various types other than the led, and the embodiment of the present invention is not limited herein.
In a preferred embodiment, the calibration signal output interface is a Fast Edge output interface.
Specifically, the Fast Edge output interface is a calibration signal output interface commonly used on a front panel of the oscilloscope 1, and can output a stable pulse signal, and the voltage value of the pulse signal is low, so that the Fast Edge output interface can be used for switching the code pattern of the USB interface without voltage reduction processing.
Of course, the calibration signal output interface may be other types besides the Fast Edge output interface, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the signal transmission line 2 is a dupont wire or a tin wire.
Specifically, the DuPont wire and the tin wire have the advantages of low cost, long service life and the like.
Of course, the signal transmission line 2 may be of various types other than the dupont line and the tin wire, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the frequency of the pulse signal is 100 MHz.
Specifically, the switching of the output signal pattern of the USB interface can be stably triggered by using a pulse signal of 100MHz, and no interference is generated to other operations of the USB interface.
Specifically, according to the requirement of the USB-IF association for the pulse signal, a pulse with a duration of 1ms of 100MHz needs to be externally input to the USB3.0port to be tested, and the USB can be used for switching the code pattern, and the USB can be switched to the next code pattern every time a pulse meeting the condition is sent out, and the calibration signal output interface can output a pulse signal with a duration of 100MHz of 1ms to trigger the switching of the code pattern, which is not limited herein.
Of course, the frequency of the pulse signal may be other specific values besides 100MHz, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the code pattern of the output signal of the USB interface to be tested comprises low-frequency periodic signals LFPS, CP0 and CP 1.
Specifically, for the USB3.0 interface, the LFPS, CP0, and CP1 are three common patterns.
Of course, besides the three code patterns, the code pattern of the USB interface output signal may be of other various types, and the embodiment of the present invention is not limited herein.
The invention also provides a USB interface test system, which comprises a USB interface to be tested and a code pattern switching device in the embodiment.
For the description of the USB interface test system provided in the embodiment of the present invention, please refer to the foregoing embodiment of the code type switching device, and the embodiment of the present invention is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A pattern switching apparatus, comprising:
the oscilloscope is used for outputting a pulse signal for triggering the USB interface to switch the code pattern through a self calibration signal output interface;
the signal transmission line is used for transmitting the pulse signal to the USB interface to be tested so as to switch the code pattern of the output signal of the USB interface to be tested.
2. The pattern switching apparatus according to claim 1, further comprising:
the USB interface clamp is used for fixing the USB interface to be tested and transmitting the pulse signal to the pin of the USB interface to be tested.
3. The pattern switching apparatus according to claim 2, further comprising:
and the prompting device is connected with the calibration signal output interface and used for prompting that the pulse signal is output when the pulse signal is received.
4. The pattern switching device according to claim 3, wherein the prompting device is a light emitting diode.
5. The pattern switching apparatus according to claim 1, wherein the calibration signal output interface is a FastEdge output interface.
6. The pattern switching device according to claim 1, wherein the signal transmission line is a dupont line or a tin wire.
7. The pattern switching apparatus according to claim 1, wherein the frequency of the pulse signal is 100 MHz.
8. The pattern switching apparatus according to any one of claims 1 to 7, wherein the pattern of the output signal of the USB interface to be tested comprises low frequency periodic signals LFPS, CP0 and CP 1.
9. A USB interface test system, comprising a USB interface to be tested, and further comprising the code pattern switching apparatus according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010107284.XA CN111367730A (en) | 2020-02-20 | 2020-02-20 | USB interface test system and code pattern switching device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010107284.XA CN111367730A (en) | 2020-02-20 | 2020-02-20 | USB interface test system and code pattern switching device thereof |
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| CN111367730A true CN111367730A (en) | 2020-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113204452A (en) * | 2021-04-23 | 2021-08-03 | 山东英信计算机技术有限公司 | Method, system and medium for measuring high-speed signal |
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2020
- 2020-02-20 CN CN202010107284.XA patent/CN111367730A/en active Pending
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| CN113204452A (en) * | 2021-04-23 | 2021-08-03 | 山东英信计算机技术有限公司 | Method, system and medium for measuring high-speed signal |
| CN113204452B (en) * | 2021-04-23 | 2023-01-10 | 山东英信计算机技术有限公司 | Method, system and medium for measuring high-speed signal |
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