CN107391854A - The method and device of crosstalk between a kind of inspection difference through hole - Google Patents

Abstract

The invention discloses a method and device for checking crosstalk between differential vias. The method includes: pre-storing the position information of each via on the board to be detected and the mapping relationship between each via and each signal line; After the signal line to be detected, extract the target position information of the target via corresponding to the signal line to be detected according to the mapping relationship to calculate the distance of the target differential via corresponding to the target via; judge whether the distance meets the requirements, if not, determine the target Differential vias have crosstalk. It can be seen that, compared with the existing manual inspection method, this method can realize automatic inspection of differential via crosstalk and improve work efficiency. In addition, the device for checking the crosstalk between differential vias disclosed in the present invention has the same effects as above.

Description

A method and device for checking crosstalk between differential vias

technical field

The invention relates to the field of electronic technology, in particular to a method and device for checking crosstalk between differential vias.

Background technique

In cloud computing products (servers, storage, etc.), the transmission rate of signal lines on motherboards, high-speed backplanes, etc. is getting faster and faster. In order to ensure that the signals received by the receiving end have good signal integrity, the The crosstalk requirements are getting higher and higher. Board cards, such as PCB boards, have crosstalk due to coupling between signal transmission channels, noise caused by mutual inductance and mutual capacitance. The signal transmission channel on the PCB includes transmission lines on the PCB, vias for connecting transmission lines of different signal layers, and the like. In a specific implementation, the position information of each via hole on the board will be recorded. According to the Intel design specification, in order to reduce the crosstalk caused by vias, there are certain requirements for the placement of differential vias. Therefore, after the wiring is completed, it is necessary to strictly check the placement of the differential vias to determine whether there is crosstalk.

However, in the prior art, in order to determine whether there is crosstalk in each pair of differential vias, it is necessary to manually check one by one, which is not only time-consuming and laborious, but also prone to missed inspections.

It can be seen that, when inspecting differential vias, how to improve the inspection efficiency and inspection quality is an urgent problem to be solved by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a method and device for inspecting crosstalk between differential vias, which are used to improve the efficiency and quality of inspection when inspecting differential vias.

In order to solve the above technical problems, the present invention provides a method for checking crosstalk between differential vias, including:

storing in advance the position information of each via hole on the board to be tested and the mapping relationship between each said via hole and each signal line;

After the user inputs the signal line to be detected, extract the target position information of the target via hole corresponding to the signal line to be detected according to the mapping relationship to calculate the distance of the target differential via hole corresponding to the target via hole;

It is judged whether the distance meets the requirements, and if not, it is determined that there is crosstalk in the target differential via.

Preferably, the judging whether the distance meets the requirements specifically includes:

judging whether the target differential vias and the corresponding reference differential vias are in a vertical relationship or a staggered relationship;

If it is the vertical relationship, calculating the center distance between the target differential vias, and the vertical distance between the target differential vias and the reference differential vias;

Judging whether the vertical distance is greater than or equal to 1.5 times the center distance, if greater than or equal to, then determine that the distance meets the requirements, otherwise the distance does not meet the requirements;

If it is the staggered relationship, calculating the center distance between the target differential vias, and the vertical distance between the target differential vias and the reference differential vias;

Judging whether the vertical distance is greater than or equal to the center distance, if greater than or equal to, determine that the distance meets the requirements, otherwise the distance does not meet the requirements.

Preferably, when the distance meets the requirements, it also includes:

Output the information that the target differential via meets the requirements, and jump to the operation of checking the next differential via.

Preferably, when the distance does not meet the requirements, it also includes:

Output information that the target differential via does not meet the requirements.

Preferably, when the distance does not meet the requirements, it also includes:

Recording position information of the signal line to be detected and the target differential via hole.

Preferably, it also includes:

A display window is created, and each via hole and the location information of each via hole are displayed in the display window according to the position information of each via hole.

In order to solve the above technical problems, the present invention provides a device for checking crosstalk between differential vias, including:

The storage module is used to pre-store the position information of each via hole on the board to be detected and the mapping relationship between each via hole and each signal line;

An extraction module, configured to extract the target position information of the target via corresponding to the target via according to the mapping relationship after the user inputs the signal line to be detected to calculate the target differential via corresponding to the target via distance;

A judging module, configured to judge whether the distance meets requirements, and if not, determine that there is crosstalk in the target differential via.

Preferably, when the distance meets the requirements, it also includes:

The first output module is configured to output the information that the target differential via meets the requirements, and jump to the operation of checking the next differential via.

Preferably, when the distance does not meet the requirements, it also includes:

The second output module is configured to output information that the target differential vias do not meet requirements.

Preferably, when the distance does not meet the requirements, it also includes:

The recording module is configured to record the position information of the signal line to be detected and the target differential via hole.

The method and device for checking crosstalk between differential vias provided by the present invention, the method includes: pre-storing the position information of each via on the board to be detected and the mapping relationship between each via and each signal line; After detecting the signal line, extract the target position information of the target via corresponding to the signal line to be detected according to the mapping relationship to calculate the distance of the target differential via corresponding to the target via; judge whether the distance meets the requirements, and if not, determine the target differential Vias have crosstalk. It can be seen that, compared with the existing manual inspection method, this method can realize automatic inspection of differential via crosstalk and improve work efficiency. In addition, the device for checking crosstalk between differential vias disclosed in the present invention has the same effect as above.

Description of drawings

In order to illustrate the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. As far as people are concerned, other drawings can also be obtained based on these drawings on the premise of not paying creative work.

FIG. 1 is a flow chart of a method for checking crosstalk between differential vias provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a vertical relationship of differential vias provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a staggered relationship of differential vias provided by an embodiment of the present invention;

FIG. 4 is a structural diagram of an apparatus for checking crosstalk between differential vias provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The core of the present invention is to provide a method and device for inspecting crosstalk between differential vias, which are used to improve inspection efficiency and inspection quality when inspecting differential vias.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a flow chart of a method for checking crosstalk between differential vias provided by an embodiment of the present invention. As shown in Figure 1, including:

S10: pre-store the location information of each via hole on the board to be tested and the mapping relationship between each via hole and each signal line.

In a specific implementation, the board may be a PCB board, and of course other types of boards are also applicable. After the board is manufactured, the position information of each via hole is known, and the position information is stored in advance, and each via hole has a unique corresponding mapping relationship with the signal line, that is, it can be found through the signal line The via hole corresponding to the signal line.

S11: After the user inputs the signal line to be detected, extract the target position information of the target via corresponding to the signal line to be detected according to the mapping relationship to calculate the distance of the target differential via corresponding to the target via.

When the user enters the order of the signal line to be detected, the via corresponding to the signal line to be detected can be found according to the mapping relationship, that is, the target via, so as to obtain the position information of the target via. After finding the position information of the target via Afterwards, another via that forms a differential via with the target via can be found through the position information, and these two vias constitute the target differential via.

S12: Judging whether the distance meets the requirements, if not, go to S13.

S13: Determine that there is crosstalk in the target differential via.

After the target differential via is obtained, the position information of the two vias can be obtained, and it can be determined whether the distance of the differential via meets the requirements by calculating the position information. In a specific implementation, since the arrangement positions of the differential vias are different, the distance requirements corresponding to different arrangement positions are different.

FIG. 2 is a schematic diagram of a vertical relationship of differential vias provided by an embodiment of the present invention. FIG. 3 is a schematic diagram of a staggered relationship of differential vias provided by an embodiment of the present invention. As shown in FIG. 2 , Pair1 is a target differential via, and Pair2 is a reference differential via for comparison with the target differential via. Wherein, the distance between two vias of the target differential via, that is, the center distance is L1, and the vertical distance between the target differential via and the reference differential via is L2. In this embodiment, the vertical relationship means that each via in the two pairs of differential vias is vertically aligned with the vias in the other pair of differential vias, and the staggered relationship means that a via in one of the differential vias is in the Below the space occupied by another pair of differential vias, and the other via is not below the space occupied by another pair of differential vias.

As a preferred implementation, judging whether the distance meets the requirements specifically includes:

Determine whether the target differential via and the corresponding reference differential via are vertical or staggered;

If it is a vertical relationship, calculate the center distance between the target differential vias, and the vertical distance between the target differential vias and the reference differential vias;

Judging whether the vertical distance is greater than or equal to 1.5 times the center distance, if greater than or equal to, determine that the distance meets the requirements, otherwise the distance does not meet the requirements;

If it is a staggered relationship, calculate the center distance between the target differential vias, and the vertical distance between the target differential vias and the reference differential vias;

Judging whether the vertical distance is greater than or equal to the center distance, if greater than or equal to, determine that the distance meets the requirements, otherwise the distance does not meet the requirements.

In the specific implementation, firstly, the center distance L1 is determined according to the position information of the two vias in the target differential via. The distance is L2. At this time, if L2≥1.5L1, the crosstalk requirement is met, and the next signal line is checked; if L2<1.5L1, the crosstalk requirement is not met.

The second case is that two pairs of differential vias are in a staggered relationship. If L2>=L1, the crosstalk requirement is met, and the next signal line is checked; if L2<L1, the crosstalk requirement is not met.

The method for checking crosstalk between differential vias provided in this embodiment includes: pre-storing the position information of each via on the board to be detected and the mapping relationship between each via and each signal line; after the user inputs the signal line to be detected According to the mapping relationship, extract the target position information of the target via corresponding to the signal line to be detected to calculate the distance of the target differential via corresponding to the target via; judge whether the distance meets the requirements, if not, determine that there is crosstalk in the target differential via . It can be seen that, compared with the existing manual inspection method, this method can realize automatic inspection of differential via crosstalk and improve work efficiency.

It should be noted that this method can be developed through the CadenceSKILL language, and the specific process will not be repeated in the present invention.

As a preferred implementation, when the distance meets the requirements, it also includes:

Output the information that the target differential via meets the requirements, and jump to the operation of checking the next differential via.

By outputting the required information, the inspector can know the inspection result of the current target differential via in time. It can be understood that there are many types of this information, for example, it is displayed on the inspection interface, or the control indicator light is turned on, or the buzzer beeps. In addition, for the convenience of subsequent viewing, the results of the extraction, calculation, and comparison of each signal line can be saved as a text file, and the user can also use Excel to open and browse the content of the text file, which is convenient for wiring engineers to check if it does not meet the crosstalk rules. The differential via placement is improved.

As a preferred implementation, when the distance does not meet the requirements, it also includes:

Output information that the target differential via does not meet the requirements.

By outputting the information that does not meet the requirements, the inspector can know the inspection result of the current target differential via in time. It can be understood that there are many types of this information, for example, it is displayed on the inspection interface, or the control indicator light is turned on, or the buzzer beeps.

As a preferred implementation, when the distance does not meet the requirements, it also includes:

Record the position information of the signal line to be detected and the target differential via.

In addition, for the convenience of subsequent viewing, the position information of signal lines with crosstalk and target differential vias can be recorded and saved as a text file. Users can also use Excel to open and browse the content of the text file, which is convenient for wiring engineers. Improved differential via placement that complies with crosstalk rules.

As a preferred embodiment, it also includes:

Create a display window, and display each via hole and the location information of each via hole in the display window according to the location information of each via hole.

In order to facilitate inspection by wiring engineers, the vias are displayed in the display window in this embodiment. It can be understood that the relative positions of the vias are unchanged. Through the program, it can also be set that when the mouse is close to a via hole, the position information of the via hole will be directly displayed, and the specific process will not be repeated in the present invention.

In the above embodiments, the method for checking crosstalk between differential vias is described in detail, and the present invention also provides a device for checking crosstalk between differential vias corresponding to the method. Since the embodiment of the device part corresponds to the embodiment of the method part, please refer to the description of the embodiment of the method part for the embodiment of the device part, and details will not be repeated here.

FIG. 4 is a structural diagram of an apparatus for checking crosstalk between differential vias provided by an embodiment of the present invention. As shown in Figure 4, the device includes:

The storage module 10 is used to pre-store the position information of each via hole on the board to be detected and the mapping relationship between each via hole and each signal line;

The extraction module 11 is used to extract the target position information of the target via hole corresponding to the signal line to be detected according to the mapping relationship to calculate the distance of the target differential via hole corresponding to the target via hole after the user inputs the signal line to be detected;

The judging module 12 is configured to judge whether the distance meets the requirements, and if not, determine that there is crosstalk in the target differential via.

Compared with the existing manual inspection method, the device for checking crosstalk between differential vias provided in this embodiment can realize automatic inspection of crosstalk between differential vias and improve work efficiency.

As a preferred implementation, when the distance meets the requirements, it also includes:

The first output module is configured to output the information that the target differential via meets the requirements, and jump to the operation of checking the next differential via.

As a preferred implementation, when the distance does not meet the requirements, it also includes:

The second output module is configured to output information that the target differential vias do not meet requirements.

As a preferred implementation, when the distance does not meet the requirements, it also includes:

The recording module is used to record the position information of the signal line to be detected and the target differential via hole.

The method and device for checking crosstalk between differential vias provided by the present invention are described above in detail. Each embodiment in the description is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Claims (10)

1. a kind of method of crosstalk between inspection difference through hole, it is characterised in that including：

Prestore the positional information of each via on board to be detected and the mapping relations of each via and each signal wire；

After user inputs signal wire to be detected, target mistake corresponding to the signal wire to be detected is extracted according to the mapping relations The target position information in hole is to calculate the distance of target difference through hole corresponding with the target via；

Judge whether the distance meets the requirements, if it is not, then determining that the target difference through hole has crosstalk.

2. the method for crosstalk between inspection difference through hole according to claim 1, it is characterised in that described to judge the distance Whether meet the requirements and specifically include：

Judge the target difference through hole with corresponding reference difference via for vertical relation or false relation；

If the vertical relation, then the centre distance between the target difference through hole, and the target difference are calculated The vertical range of via and the reference difference via；

Judge whether the vertical range is more than or equal to 1.5 times of the centre distance, if greater than or be equal to, it is determined that institute Distance is stated to meet the requirements, it is otherwise described apart from undesirable；

If the false relation, then the centre distance between the target difference through hole, and the target difference are calculated The vertical range of via and the reference difference via；

Judge whether the vertical range is more than or equal to the centre distance, if greater than or be equal to, it is determined that the distance Meet the requirements, it is otherwise described apart from undesirable.

3. the method for crosstalk between inspection difference through hole according to claim 1, it is characterised in that when the distance conforms to When asking, in addition to：

The satisfactory information of target difference through hole is exported, and jumps to the operation for checking next difference through hole.

4. the method for crosstalk between inspection difference through hole according to claim 1, it is characterised in that when the distance is not met It is required that when, in addition to：

Export the undesirable information of target difference through hole.

5. the method for crosstalk between inspection difference through hole according to claim 4, it is characterised in that when the distance is not met It is required that when, in addition to：

Record the positional information of the signal wire to be detected and the target difference through hole.

6. the method for crosstalk between the inspection difference through hole according to claim 1-5 any one, it is characterised in that also wrap Include：

Display window is created, and each via is shown in the display window according to the positional information of each via, and The positional information of each via.

A kind of 7. device of crosstalk between inspection difference through hole, it is characterised in that including：

Memory module, for prestoring the positional information and each via and each signal of each via on board to be detected The mapping relations of line；

Extraction module, for after user inputs signal wire to be detected, the signal to be detected to be extracted according to the mapping relations The target position information of target via corresponding to line is to calculate the distance of target difference through hole corresponding with the target via；

Judge module, for judging whether the distance meets the requirements, if it is not, then determining that the target difference through hole has string Disturb.

8. the device of crosstalk between inspection difference through hole according to claim 7, it is characterised in that when the distance conforms to When asking, in addition to：

First output module, for exporting the satisfactory information of target difference through hole, and jump to and check next difference mistake The operation in hole.

9. the device of crosstalk between inspection difference through hole according to claim 7, it is characterised in that when the distance is not met It is required that when, in addition to：

Second output module, for exporting the undesirable information of target difference through hole.

10. the device of crosstalk between inspection difference through hole according to claim 9, it is characterised in that when the distance is not inconsistent When conjunction requires, in addition to：

Logging modle, for recording the positional information of the signal wire to be detected and the target difference through hole.