CN112069767B - Transmission line wiring length estimation method, device, equipment and medium - Google Patents
Transmission line wiring length estimation method, device, equipment and medium Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a medium for estimating the wiring length of a transmission line, which comprise the following steps: obtaining the design length, the design coupling space and the pre-estimated coupling space of a target transmission line; determining a first transmission quality and a second transmission quality of a target transmission line; determining a transmission quality variation between the first transmission quality and the second transmission quality; determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality and the transmission quality change of the target transmission line; and determining the estimated length of the target transmission line according to the designed length and the equivalent length. The method and the device are equivalent to the length variation of the transmission line without coupling interference through the transmission quality variation in different coupling spaces, so that the adjustment quantity of the wiring length of the transmission line caused by the adjustment of the coupling spaces can be rapidly determined, the project assessment reference is convenient to use, and the development efficiency and the link assessment accuracy of the project are improved.
Description
Technical Field
The invention relates to the technical field of circuit boards, in particular to a transmission line wiring length estimation method, a transmission line wiring length estimation device, transmission line wiring length estimation equipment and a transmission line wiring length estimation medium.
Background
With the increasing of the high-speed signal rate and the continuous compression of the motherboard structure space, during the design of the high-speed signal link, analog simulation is usually performed in advance according to the estimated wiring length of the designed link and the allowable wiring coupling space.
During the early-stage scheme evaluation of the high-speed signal link design, due to the fact that design time and requirement change frequently, the wiring length and wiring coupling space of the estimated design can be adjusted for multiple times, wherein the wiring coupling space is mainly adjusted, and the wiring length is adjusted according to the adjusted wiring coupling space.
However, in the related art, after the wiring coupling space is adjusted, the wiring length is adjusted in a "trial and error" manner, and the determined wiring coupling space and different wiring lengths are subjected to simulation evaluation to determine which wiring length and current coupling space meet the estimated requirement. However, because the uncertain factors of the architecture scheme are more, the estimated wiring length of the design and the number of times of adjusting the wiring coupling space are more, and further the time of simulation evaluation is increased; and the time of each simulation evaluation is longer, so that the time of designing the high-speed signal link exceeds the total planning time. That is to say, in the related art, after the coupling space is adjusted, the adjustment amount of the wiring length cannot be accurately estimated, so that the high-speed link design has a problem of low efficiency, and the project development progress is affected.
Disclosure of Invention
The embodiment of the application provides a transmission line wiring length estimation method, a transmission line wiring length estimation device, transmission line wiring length estimation equipment and a transmission line wiring length estimation medium, solves the technical problem that in the prior art, the adjustment quantity of the wiring length caused by coupling space adjustment cannot be accurately estimated, and achieves the technical effects that the adjustment quantity of the wiring length caused by coupling space adjustment can be rapidly determined, and then the wiring length matched with the adjusted coupling space can be rapidly determined.
In a first aspect, the present application provides a method for estimating a wiring length of a transmission line, the method including:
obtaining the design length, the design coupling space and the pre-estimated coupling space of a target transmission line; the estimated coupling space is formed after the design coupling space does not meet the design requirement of the circuit board;
determining a first transmission quality and a second transmission quality of a target transmission line; wherein the first transmission quality is obtained by the target transmission line under the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space;
determining a transmission quality variation between the first transmission quality and the second transmission quality;
determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality and the transmission quality change of the target transmission line;
and determining the estimated length of the target transmission line according to the designed length and the equivalent length.
Further, the first transmission quality, the second transmission quality, and the transmission quality variation are determined as follows:
the first transmission quality is determined according to a first eye diagram obtained by the target transmission line under the design coupling space, and the first transmission quality comprises a first eye height and a first eye width of the first eye diagram;
the second transmission quality is determined according to a second eye diagram obtained by the target transmission line under the estimated coupling space, and the second transmission quality comprises a second eye height and a second eye width of the second eye diagram;
the transmission quality variation includes an eye height variation determined by the first eye height and the second eye height and an eye width variation determined by the first eye width and the second eye width.
Further, the transmission quality per unit length includes a unit eye height and a unit eye width, and the unit eye height is an eye height corresponding to the unit length of the target transmission line; the unit eye width refers to the eye width corresponding to the unit length of the target transmission line;
determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality and the transmission quality change of the target transmission line, and specifically comprising the following steps:
determining a first equivalent length according to the eye height change and the unit eye height;
determining a second equivalent length according to the eye width change and the unit eye width;
and taking the maximum length of the first equivalent length and the second equivalent length as the equivalent length according to the size relation of the first equivalent length and the second equivalent length.
Further, the transmission quality per unit length of the target transmission line is determined as follows:
obtaining a plurality of sample transmission lines; wherein the type of the sample transmission line is the same as that of the target transmission line; the sample lengths of the plurality of sample transmission lines are in an arithmetic progression, and the sample lengths of the plurality of sample transmission lines form a first ordered set according to the order of the arithmetic progression;
determining a sample transmission quality of each of the plurality of sample transmission lines; wherein the sample transmission quality is determined by the sample transmission line without coupling interference;
forming a second ordered set of sample transmission qualities of the plurality of sample transmission lines according to the order of the first ordered set;
determining a sample quality variation between respective adjacent sample transmission qualities in the second ordered set;
determining a first unit length transmission quality of the sample transmission line according to the sample quality variation and the sample length variation between adjacent sample lengths in the corresponding first ordered set;
the first transmission quality per unit length is taken as the transmission quality per unit length of the target transmission line.
In a second aspect, the present application provides a wire conveying and routing length estimating device, comprising:
the acquisition module is used for acquiring the design length, the design coupling space and the estimated coupling space of the target transmission line; the estimated coupling space is formed after the design coupling space does not meet the design requirement of the circuit board;
a first determination module for determining a first transmission quality and a second transmission quality of a target transmission line; wherein the first transmission quality is obtained by the target transmission line under the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space;
a second determination module for determining a transmission quality variation between the first transmission quality and the second transmission quality;
the equivalent length determining module is used for determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality and the transmission quality change of the target transmission line;
and the estimated length determining module is used for determining the estimated length of the target transmission line according to the designed length and the equivalent length.
Further, the first transmission quality is determined according to a first eye diagram obtained by the target transmission line under the design coupling space, and the first transmission quality comprises a first eye height and a first eye width of the first eye diagram;
the second transmission quality is determined according to a second eye diagram obtained by the target transmission line under the estimated coupling space, and the second transmission quality comprises a second eye height and a second eye width of the second eye diagram;
the transmission quality variation includes an eye height variation determined by the first eye height and the second eye height and an eye width variation determined by the first eye width and the second eye width.
Further, the transmission quality per unit length includes a unit eye height and a unit eye width, and the unit eye height is an eye height corresponding to the unit length of the target transmission line; the unit eye width refers to the eye width corresponding to the unit length of the target transmission line;
wherein, the equivalent length determination module comprises:
the first determining submodule is used for determining a first equivalent length according to the eye height change and the unit eye height;
the second determining submodule is used for determining a second equivalent length according to the eye width change and the unit eye width;
and the third determining submodule is used for taking the maximum length of the first equivalent length and the second equivalent length as the equivalent length according to the size relation between the first equivalent length and the second equivalent length.
Further, the equivalent length determining module further comprises:
the acquisition submodule is used for acquiring a plurality of sample transmission lines; the type of the sample transmission line is the same as that of the target transmission line; the sample lengths of the plurality of sample transmission lines are in an arithmetic progression, and the sample lengths of the plurality of sample transmission lines form a first ordered set according to the order of the arithmetic progression;
the fourth determining submodule is used for determining the sample transmission quality of each sample transmission line in the plurality of sample transmission lines; wherein the sample transmission quality is determined by the sample transmission line without coupling interference;
the forming submodule is used for forming a second ordered set of the sample transmission quality according to the order of the first ordered set of the sample transmission qualities of the plurality of sample transmission lines;
a fifth determining submodule, configured to determine a sample quality variation between transmission qualities of respective adjacent samples in the second ordered set;
a sixth determining submodule, configured to determine a first unit length transmission quality of the sample transmission line according to the sample quality change and a sample length change between adjacent sample lengths in the corresponding first ordered set;
in a third aspect, the present application provides an electronic device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to execute to implement a transmission line routing length estimation method.
In a fourth aspect, the present application provides a non-transitory computer readable storage medium having instructions that, when executed by a processor of an electronic device, enable the electronic device to perform a method of transmission line wire length estimation.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the method and the device have the advantages that the transmission quality change in different coupling spaces is equivalent to the length change of the transmission line without coupling interference, so that the adjustment quantity of the wiring length of the transmission line caused by the adjustment of the coupling spaces can be rapidly determined, the project assessment reference is facilitated, and the development efficiency and the link assessment accuracy of the project are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for estimating a wiring length of a transmission line according to the present invention;
fig. 2 is a flowchart of a method for determining transmission quality per unit length according to the present application;
fig. 3 is a schematic structural diagram of a transmission line routing length estimation device provided in the present application;
fig. 4 is a schematic structural diagram of an electronic device provided in the present application.
Detailed Description
First, the present application first describes the related art, in a high-speed link design project, when the project is evaluated in the early stage, the design coupling space is 5H (H is a mutual inductance unit-henry), but in the later stage of the project, the design requirement changes, such as a problem of structural interference, and the allowable coupling space is only 4H, that is, the estimated coupling space is 4H. That is, the need to change the coupling space from 5H to 4H means that the coupling space becomes smaller and the pitch between the transmission line pairs becomes smaller, which means that the transmission line will no longer need to be as long as it was, and the length of the transmission line needs to be shortened.
In the related art, when the coupling space is changed, the length of the transmission line can be determined only by means of "trial and error". The method is characterized in that transmission lines with different lengths are adopted, and under the condition that the coupling space is determined, the current configuration is simulated, so that whether the current configuration meets the project requirements or not is determined. In the "trial and error" process, the length of the transmission line can only be selected and adjusted by the experience of the operator.
Therefore, after the coupling space is adjusted, the adjustment amount of the wiring length caused by the adjustment of the coupling space cannot be accurately estimated in the related art, and a great deal of effort and time are needed to determine the length of the transmission line, so that the project period is prolonged; because the length of the transmission line is determined manually through a 'trial and error' mode, the 'trial and error' period is long, and the probability of human errors is extremely high.
The embodiment of the application provides a transmission line wiring length estimation method, and solves the technical problem that the adjustment quantity of the wiring length caused by coupling space adjustment cannot be accurately estimated in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method for estimating the wiring length of a transmission line comprises the following steps: obtaining the design length, the design coupling space and the pre-estimated coupling space of a target transmission line; wherein, the estimated coupling space is formed after the design coupling space does not meet the design requirement of the circuit board; determining a first transmission quality and a second transmission quality of a target transmission line; wherein the first transmission quality is obtained by the target transmission line under the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space; determining a transmission quality variation between the first transmission quality and the second transmission quality; determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality and the transmission quality change of the target transmission line; and determining the estimated length of the target transmission line according to the designed length and the equivalent length.
The method and the device are equivalent to the length variation of the transmission line without coupling interference through the transmission quality variation in different coupling spaces, so that the adjustment quantity of the wiring length of the transmission line caused by the adjustment of the coupling spaces can be rapidly determined, the project assessment reference is convenient to use, and the development efficiency and the link assessment accuracy of the project are improved.
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The application provides a method for estimating the wiring length of a transmission line as shown in fig. 1, which comprises the following steps:
step S11, obtaining the design length, the design coupling space and the estimated coupling space of the target transmission line; the estimated coupling space is formed after the design coupling space does not meet the design requirement of the circuit board;
the target transmission line refers to a transmission line which needs to be adjusted in wiring length and coupling space in a high-speed link design project. The design length and the design coupling space are designed according to the pre-design requirement of the high-speed link design project, and the pre-estimated coupling space is determined according to the pre-design requirement of the changed high-speed link design project. Thus, the estimated coupling space is the coupling space that is re-determined after the design coupling space does not meet the circuit board design requirements in the high speed link design project.
For example, in the pre-project evaluation, the design coupling space is 5H (H is the mutual inductance unit-henry), but in the later project, the design requirement changes, such as structural interference and other problems, and the allowable coupling space is only 4H, that is, the estimated coupling space is 4H.
TABLE 1
An example is now provided, as shown in table 1, for a transmission line of UPI2.0, the design length is 22inch and the design coupling space is 5H, but due to the change of the design requirement, the coupling space is adjusted to the estimated coupling space, i.e. 5H is adjusted to 4H or 3H.
Step S12, determining a first transmission quality and a second transmission quality of the target transmission line; wherein the first transmission quality is obtained by the target transmission line under the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space.
Because the design coupling space of the target transmission line is changed to the estimated coupling space (generally, the estimated coupling space is smaller than the design coupling space), the coupling space is reduced, which leads to the increase of crosstalk between wiring pairs, thereby directly influencing the transmission quality of the target transmission line and simultaneously influencing the wiring length.
The inventor finds that under the condition of no coupling interference, the transmission quality of the transmission lines with the same type has an approximately linear relation with the length of the transmission lines, so that the attenuation of the transmission quality under the coupling crosstalk can be equivalent to the length of the transmission lines under the condition of no coupling interference, the length adjustment quantity of the transmission lines under the condition of no coupling interference is further determined according to the attenuation of the transmission quality, the adjustment quantity of the length of the transmission lines caused by the coupling space adjustment is further rapidly determined, the mode that the length of the transmission lines can be determined only by continuous simulation in the related technology is avoided, the determination efficiency of the length of the transmission lines is greatly improved, meanwhile, the probability of human errors is reduced, and the project development progress and the design evaluation quality are improved.
Based on the above findings, step S12 obtains a first transmission quality of the target transmission line in the designed coupling space and a second transmission quality of the target transmission line in the estimated coupling space.
The transmission quality can be obtained through an eye diagram, the eye diagram is a graph displayed by accumulating a series of digital signals on an oscilloscope, the eye diagram contains rich information, the influence of crosstalk and noise can be observed from the eye diagram, the integral characteristic of the digital signals is reflected, and therefore the quality degree of the system is estimated, and the eye diagram analysis is the core of the signal integrity analysis of the high-speed interconnection system. The eye diagram comprises eye height and eye width, the eye height is used for reflecting noise tolerance, and the higher the eye height is, the better the transmission quality is; the eye width is used to reflect the settling time, the wider the eye width, the more stable the transmission.
Therefore, the first transmission quality, the second transmission quality, and the transmission quality variation in step S12 may be determined as follows:
the first transmission quality is determined according to a first eye diagram obtained by the target transmission line under the design coupling space, and the first transmission quality comprises a first eye height and a first eye width of the first eye diagram;
the second transmission quality is determined based on a second eye pattern obtained by the target transmission line under the estimated coupling space, and the second transmission quality includes a second eye height and a second eye width of the second eye pattern.
Following the example of step S11, the estimated coupling space is determined to be 4H for ease of illustration. As shown in table 1, in designing the coupling space 5H, the first eye height is 20.6mV, and the first eye width is 18.6 ps; in designing the coupling space 4H, the second eye height is 18.3mV and the second eye width is 17.5 ps. As can be seen from table 1, the smaller the coupling space is, both the eye height and the eye width are attenuated, which means that the transmission quality is degraded.
Step S13 of determining a transmission quality variation between the first transmission quality and the second transmission quality;
the transmission quality variation includes an eye height variation determined by the first eye height and the second eye height and an eye width variation determined by the first eye width and the second eye width.
Generally, the smaller the coupling space, the more serious the crosstalk effect, and the worse the transmission quality, the lower the eye height and the narrower the eye width. Thus, in a typical case, the first eye height is higher than the second eye height, the first eye width is larger than the second eye width, the eye height variation is the difference between the first eye height and the second eye height, and the eye width variation is the difference between the first eye width and the second eye width.
Following the example of step S12, as shown in table 1, the transmission quality variation includes eye height variation and eye width variation, the eye height variation is 2.3mV, and 2.3mV is obtained by subtracting the second eye height from the first eye height of 20.6 mV; the eye width variation is 1.1ps, and 1.1ps is obtained by subtracting the second eye width from the first eye width of 18.6ps by 17.5 ps.
Step S14, according to the unit length transmission quality and the transmission quality change of the target transmission line, determining the equivalent length of the target transmission line corresponding to the transmission quality change;
the unit eye height refers to the eye height corresponding to the unit length of the target transmission line; the unit eye width refers to an eye width corresponding to a unit length of the target transmission line.
As shown in fig. 2, the transmission quality per unit length of the target transmission line is determined as follows:
step 1401, obtaining a plurality of sample transmission lines; wherein the type of the sample transmission line is the same as that of the target transmission line; the sample lengths of the plurality of sample transmission lines are in an arithmetic progression, and the sample lengths of the plurality of sample transmission lines form a first ordered set according to the order of the arithmetic progression;
for example, taking the transmission line of UPI2.0 as an example, a plurality of sample transmission lines are obtained, as shown in table 2, and the sample length of each sample transmission line is as shown in the table, it can be seen that the sample length increases from 18 inches to 22 inches in steps of 0.5 inches. From the sample lengths the following first ordered set can be obtained:
{18，18.5，19，19.5，20，20.5，21，21.5，22}
TABLE 2
Step S1402, determining a sample transmission quality of each of the plurality of sample transmission lines; wherein the sample transmission quality is determined by the sample transmission line without coupling interference;
the sample transmission quality is determined from the eye pattern obtained for each sample transmission line without coupling interference.
Step S1403, forming a second ordered set of sample transmission qualities from the sample transmission qualities of the plurality of sample transmission lines according to the order of the first ordered set;
a second ordered set of sample transmission qualities is formed in the order of the first ordered set with the aim that the lengths of the samples in the first ordered set correspond in turn to the sample transmission qualities in the second ordered set.
The sample transmission quality includes a sample eye height and a sample eye width. Thus, the second ordered set includes a sample eye height set and a sample eye width set.
With the example provided in step S1401, a sample eye height set and a sample eye width set of each sample transmission line under the condition of no coupling interference can also be obtained according to table 2, which are specifically as follows:
sample eye height set: {35.4, 34.2, 33.1, 31.8, 30.7, 29.5, 28.3, 27, 25.8 };
sample eye width set: {28.5, 27.9, 27.2, 26.7, 26.1, 25.5, 24.8, 24.3, 23.7}
Step S1404, determining a plurality of sample quality variations between respective adjacent sample transmission qualities in the second ordered set;
following the example set forth in step S1403, the adjacent eye height difference is determined from the difference between adjacent eye heights in the sample eye height set, and the adjacent eye width difference is determined from the difference between adjacent eye widths in the sample eye width set. As shown in Table 2, when the eye height of the sample corresponding to 18inch is 35.4mV and the eye height of the sample corresponding to 18.5inch is 34.2mV, the difference between the adjacent eye heights is 1.2mV, and 1.2mV is obtained by subtracting 34.2mV from 35.4 mV. The sample eye width for 18inch is 28.5ps and the sample eye width for 18.5inch is 27.9ps, then the adjacent eye width difference is 0.6ps, with 0.6ps being the difference between 28.5ps and 27.9 ps.
A sample mass change set may be obtained according to table 2, where the sample mass change set includes a sample eye height change set and a sample eye width change set, and the details are as follows:
sample eye height variation set: {0, 1.2, 1.1, 1.3, 1.1, 1.2, 1.2, 1.3, 1.2 };
sample eye width variation set: {0,0.6,0.7,0.5,0.6,0.6,0.7,0.5,0.6}
From the sample eye height variation set, it can be seen that the eye height variation floats around 1.2mv, which can be approximately considered as a linear variation. In the actual production process, the data in the sample eye height change set can be subjected to accurate data algorithm processing or can be estimated, the data in the sample eye height change set is determined to float around which value, and then the linear slope of the transmission quality and the length of the transmission line can be determined according to the value.
Similarly, as can be seen from the sample eye width variation set, the eye height variation floats around 0.6ps, which can be approximately considered as a linear variation. In the actual production process, the data in the sample eye width change set can be subjected to accurate data algorithm processing or estimated, the data in the sample eye width change set is determined to float around which value, and then the linear slope of the transmission quality and the length of the transmission line can be determined according to the value.
Step S1405, determining a first unit length transmission quality of the sample transmission line according to the plurality of sample quality variations and a sample length variation between adjacent sample lengths in the corresponding first ordered set;
the sample mass variation is related to the sample length, and the sample mass variation includes a sample eye height variation and a sample eye width variation. Following the example of step S1404, as shown in table 2, it can be seen that the sample eye height changes by about 1.2mV and the sample eye width changes by about 0.6ps for each 0.5inch change in the length of the sample transmission line. Therefore, it can be found that for the transmission line of UPI2.0, the eye height changes by 2.4mV and the eye width changes by 1.2ps for each 1inch of the length, and then the unit eye height and the unit eye width in the mass per unit length of the transmission line of UPI2.0 are 2.4mV/inch and 1.2ps/inch, which can be regarded as the linear slope of the transmission quality and the length of the transmission line.
In step S1406, the first transmission quality per unit length is set as the transmission quality per unit length of the target transmission line.
After the first transmission quality per unit length of the sample transmission line is determined, the transmission quality per unit length of the target transmission line can be determined.
In steps S1401 to S1406, the greater the number of the selected sample transmission lines, the smaller the difference between the lengths of the sample transmission lines, and the more accurate the transmission quality per unit length is determined. However, since the transmission quality of the same type of transmission line is affected by different factors in different usage environments, the transmission quality per unit length can only provide a reference for design items, and the transmission quality per unit length cannot be used as the characteristics of the corresponding type of transmission line. Therefore, in order to reasonably use resources, the number of the selected sample transmission lines is moderate in the steps S1401 to S1406, and the difference between the lengths of the sample transmission lines is moderate.
Returning to step S14, step S14 specifically includes:
step S1411, determining a first equivalent length according to the eye height change and the unit eye height;
the first equivalent length can be determined by dividing the eye height variation by the unit eye height.
Step S1412, determining a second equivalent length according to the eye width change and the unit eye width;
the second equivalent length can be determined by dividing the eye width variation by the unit eye width.
By integrating the two examples of step S13 and step S1405, a unit eye height of 2.4mV/inch and a unit eye width of 1.2ps/inch in the transmission quality per unit length can be obtained; the eye height can also be changed to 2.3 mV; the eye width variation was 1.1 ps.
It can thus be determined that the first equivalent length is approximately equal to 0.958inch, 0.958inch being obtained by dividing 2.3mV by 2.4 mV/inch; the second equivalent length is approximately equal to 0.92inch, which is obtained by dividing 1.1mV by 1.2 mV/inch.
Step S1413, according to the size relationship between the first equivalent length and the second equivalent length, the maximum length of the first equivalent length and the second equivalent length is regarded as the equivalent length.
The maximum length of the first equivalent length and the second equivalent length is set as the equivalent length, which is intended to leave a certain margin for the wiring of the item, i.e., to increase the variation of the length of the target transmission line as much as possible, so that the estimated length obtained in step S15 is shorter, thereby achieving better wiring.
And step S15, determining the estimated length of the target transmission line according to the designed length and the equivalent length.
And subtracting the equivalent length from the designed length to obtain the estimated length of the target transmission line.
In the example of step S1412, the design length is 22inch and the equivalent length is 1inch, so the estimated length is 21inch and 21inch is obtained by subtracting 1inch from 22inch, as shown in table 3.
When the preset coupling space is 3H, the process of determining the length of the corresponding target transmission line is the same as the above process, and is not described herein again.
Combining table 1 and table 3, it can be seen that the eye height and eye width of the first set of data (length 22inch, coupling space 5H), the second set of data (length 21inch, coupling space 4H), and the third set of data (length 19.5inch, coupling space 5H) are not greatly different, and the technical idea of "equivalent transmission quality variation under different coupling spaces to length variation of transmission line under no coupling interference" provided by the inventor can be proved to be feasible. When the preset coupling space is multiple, for example, the preset coupling space is 4H and 3H, the corresponding length can be quickly determined through the technical scheme provided by the application, so that a large amount of simulation time is saved, and the development efficiency of the project and the link evaluation accuracy can be effectively improved.
TABLE 3
Since the purpose of the present application is to estimate the length variation of the target transmission line, rather than accurately determine the accurate length variation of the target transmission line (the accurate length variation cannot be determined in the related art), the estimated length obtained in the present application is only an approximate length, and is only used as a reference for the project, so as to reduce the simulation times. Therefore, in the data processing process, besides the actual data obtained from the eye diagram, when other data are processed, only estimation processing is needed instead of accuracy, and the principle of estimation can be adjusted according to specific situations.
For example, in step S1404 and step S1405, when the center value of the numerical fluctuation is determined from the sample eye height variation set, 1.2mV may be used as data for determining the eye height per unit, 1.1mV may be used as data for determining the eye height per unit, or 1.3mV may be used as data for determining the eye height per unit. In actual operation, which numerical value is specifically used as the numerical value for determining the eye height of the unit can be determined by a worker according to actual conditions.
For another example, in step S1412, when the first equivalent length is obtained, the result obtained by dividing 2.3mV by 2.4mV/inch is approximately equal to 0.958inch, and in actual operation, it may be regarded as 1inch, or it may be regarded as 1.1inch by floating upward, and the value may be determined according to specific situations, as long as the floating range between the finally determined value and the actual calculation result is suitable. For example, the result of the calculation is 0.958inch, it is appropriate to estimate it as 1inch, 1.1inch, and it is not appropriate to estimate it as 5 inch.
This application is through the transmission quality change equivalence with under the different coupling spaces for the length variation volume of transmission line under no coupling interference, and then can confirm the adjustment volume of the wiring length of transmission line that leads to because of the adjustment in coupling space fast, make things convenient for project evaluation reference to use, improve the development efficiency and the link evaluation degree of accuracy of project, avoided constantly simulating the mode that just can confirm the transmission line length among the correlation technique, the efficiency of confirming transmission line length has been improved greatly, the probability of human error has also been reduced simultaneously, improve project development progress and design evaluation quality.
Based on the same inventive concept, another embodiment of the present application provides a wire transmission and routing length estimation apparatus as shown in fig. 3, including:
an obtaining module 31, configured to obtain a design length of a target transmission line, a design coupling space, and an estimated coupling space; the estimated coupling space is formed after the design coupling space does not meet the design requirement of the circuit board;
a first determination module 32 for determining a first transmission quality and a second transmission quality of the target transmission line; wherein the first transmission quality is obtained by the target transmission line under the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space;
a second determining module 33 for determining a transmission quality variation between the first transmission quality and the second transmission quality;
an equivalent length determining module 34, configured to determine, according to the transmission quality per unit length of the target transmission line and the transmission quality change, an equivalent length of the target transmission line corresponding to the transmission quality change;
and the estimated length determining module 35 is configured to determine the estimated length of the target transmission line according to the designed length and the equivalent length.
Further, the first transmission quality is determined according to a first eye diagram obtained by the target transmission line under the design coupling space, and the first transmission quality comprises a first eye height and a first eye width of the first eye diagram;
the second transmission quality is determined according to a second eye diagram obtained by the target transmission line under the estimated coupling space, and the second transmission quality comprises a second eye height and a second eye width of the second eye diagram;
the transmission quality variation includes an eye height variation determined by the first eye height and the second eye height and an eye width variation determined by the first eye width and the second eye width.
Further, the transmission quality per unit length includes a unit eye height and a unit eye width, and the unit eye height is an eye height corresponding to the unit length of the target transmission line; the unit eye width refers to the eye width corresponding to the unit length of the target transmission line;
the equivalent length determining module 34 includes:
the first determining submodule is used for determining a first equivalent length according to the eye height change and the unit eye height;
the second determining submodule is used for determining a second equivalent length according to the eye width change and the unit eye width;
and the third determining submodule is used for taking the maximum length of the first equivalent length and the second equivalent length as the equivalent length according to the size relation between the first equivalent length and the second equivalent length.
Further, the equivalent length determining module 34 further includes:
the obtaining submodule is used for obtaining a plurality of sample transmission lines; the type of the sample transmission line is the same as that of the target transmission line; the sample lengths of the plurality of sample transmission lines are in an arithmetic progression, and the sample lengths of the plurality of sample transmission lines form a first ordered set according to the order of the arithmetic progression;
the fourth determining submodule is used for determining the sample transmission quality of each sample transmission line in the plurality of sample transmission lines; wherein the sample transmission quality is determined by the sample transmission line without coupling interference;
the forming submodule is used for forming a second ordered set of the sample transmission quality according to the order of the first ordered set of the sample transmission qualities of the plurality of sample transmission lines;
a fifth determining submodule, configured to determine a plurality of sample quality variations between transmission qualities of respective adjacent samples in the second ordered set;
a sixth determining submodule, configured to determine a first unit length transmission quality of the sample transmission line according to the plurality of sample quality changes and a sample length change between adjacent sample lengths in the corresponding first ordered set;
based on the same inventive concept, another embodiment of the present application provides an electronic device as shown in fig. 4, including:
a processor 41;
a memory 42 for storing instructions executable by the processor 41;
wherein the processor 41 is configured to execute to implement a transmission line wiring length estimation method.
Based on the same inventive concept, another embodiment of the present application provides a non-transitory computer-readable storage medium, where instructions in the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform a method of implementing transmission line wiring length estimation.
Since the electronic device described in this embodiment is an electronic device used for implementing the method for processing information in this embodiment, a person skilled in the art can understand the specific implementation manner of the electronic device of this embodiment and various variations thereof based on the method for processing information described in this embodiment, and therefore, how to implement the method in this embodiment by the electronic device is not described in detail here. Electronic devices used by those skilled in the art to implement the method for processing information in the embodiments of the present application are all within the scope of the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A transmission line wiring length estimation method is characterized by comprising the following steps:
obtaining the design length, the design coupling space and the pre-estimated coupling space of a target transmission line; wherein the estimated coupling space is formed after the design coupling space does not meet the design requirements of the circuit board;
determining a first transmission quality and a second transmission quality of the target transmission line; wherein the first transmission quality is obtained by the target transmission line at the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space;
determining a transmission quality variation between the first transmission quality and the second transmission quality;
determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality of the target transmission line and the transmission quality change;
determining the estimated length of the target transmission line according to the designed length and the equivalent length;
wherein the first transmission quality, the second transmission quality, and the transmission quality variation are determined as follows:
the first transmission quality is determined according to a first eye diagram obtained by the target transmission line under the design coupling space, and the first transmission quality comprises a first eye height and a first eye width of the first eye diagram;
the second transmission quality is determined according to a second eye diagram obtained by the target transmission line under the estimated coupling space, and the second transmission quality comprises a second eye height and a second eye width of the second eye diagram;
the transmission quality variation includes an eye height variation determined by the first eye height and the second eye height and an eye width variation determined by the first eye width and the second eye width;
the unit length transmission quality comprises a unit eye height and a unit eye width, and the unit eye height refers to the eye height corresponding to the unit length of the target transmission line; the unit eye width is the eye width corresponding to the unit length of the target transmission line;
determining the equivalent length of the target transmission line corresponding to the transmission quality change according to the unit length transmission quality of the target transmission line and the transmission quality change, specifically comprising:
determining a first equivalent length according to the eye height change and the unit eye height;
determining a second equivalent length according to the eye width variation and the unit eye width;
and according to the size relation between the first equivalent length and the second equivalent length, taking the maximum length of the first equivalent length and the second equivalent length as the equivalent length.
2. The method of claim 1, wherein the transmission quality per unit length of the target transmission line is determined as follows:
obtaining a plurality of sample transmission lines; wherein the sample transmission line is the same kind as the target transmission line; the sample lengths of the sample transmission lines are equal difference number arrays, and the sample lengths of the sample transmission lines form a first ordered set according to the order of the equal difference number arrays;
determining a sample transmission quality of each of the plurality of sample transmission lines; wherein the sample transmission quality is determined by the sample transmission line without coupling interference;
forming a second ordered set of the sample transmission qualities for the plurality of sample transmission lines in the order of the first ordered set;
determining a sample quality variation between respective adjacent ones of the sample transmission qualities in the second ordered set;
determining a first unit length transmission quality of the sample transmission line according to the sample quality variation and a corresponding sample length variation between adjacent sample lengths in the first ordered set;
taking the first transmission quality per unit length as the transmission quality per unit length of the target transmission line.
3. A transmission line wiring length estimation device, characterized in that the device comprises:
the acquisition module is used for acquiring the design length, the design coupling space and the estimated coupling space of the target transmission line; wherein the estimated coupling space is formed after the design coupling space does not meet the design requirements of the circuit board;
a first determining module for determining a first transmission quality and a second transmission quality of the target transmission line; wherein the first transmission quality is obtained by the target transmission line at the design coupling space; the second transmission quality is obtained by the target transmission line under the estimated coupling space;
a second determination module to determine a transmission quality variation between the first transmission quality and the second transmission quality;
an equivalent length determining module, configured to determine, according to the transmission quality per unit length of the target transmission line and the transmission quality change, an equivalent length of the target transmission line corresponding to the transmission quality change;
the estimated length determining module is used for determining the estimated length of the target transmission line according to the design length and the equivalent length;
the first transmission quality is determined according to a first eye diagram obtained by the target transmission line under the design coupling space, and the first transmission quality comprises a first eye height and a first eye width of the first eye diagram;
the second transmission quality is determined according to a second eye diagram obtained by the target transmission line under the estimated coupling space, and the second transmission quality comprises a second eye height and a second eye width of the second eye diagram;
the transmission quality variation includes an eye height variation determined by the first eye height and the second eye height and an eye width variation determined by the first eye width and the second eye width;
the unit length transmission quality comprises a unit eye height and a unit eye width, and the unit eye height refers to the eye height corresponding to the unit length of the target transmission line; the unit eye width is the eye width corresponding to the unit length of the target transmission line;
wherein, the equivalent length determination module comprises:
the first determining submodule is used for determining a first equivalent length according to the eye height change and the unit eye height;
the second determining submodule is used for determining a second equivalent length according to the eye width change and the unit eye width;
and the third determining submodule is used for taking the maximum length of the first equivalent length and the second equivalent length as the equivalent length according to the size relation between the first equivalent length and the second equivalent length.
4. The apparatus of claim 3, wherein the equivalent length determination module further comprises:
the obtaining submodule is used for obtaining a plurality of sample transmission lines; wherein the sample transmission line is the same kind as the target transmission line; the sample lengths of the sample transmission lines are equal difference number arrays, and the sample lengths of the sample transmission lines form a first ordered set according to the order of the equal difference number arrays;
a fourth determining submodule for determining a sample transmission quality of each of the plurality of sample transmission lines; wherein the sample transmission quality is determined by the sample transmission line without coupling interference;
a forming submodule, configured to form a second ordered set of the sample transmission qualities of the plurality of sample transmission lines in an order of the first ordered set;
a fifth determining submodule, configured to determine a sample quality variation between the sample transmission qualities of respective adjacent samples in the second ordered set;
a sixth determining submodule, configured to determine a first unit length transmission quality of the sample transmission line according to the sample quality variation and a corresponding sample length variation between adjacent sample lengths in the first ordered set;
a seventh determining submodule configured to use the first transmission quality per unit length as the transmission quality per unit length of the target transmission line.
5. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute to implement a transmission line wiring length estimation method as claimed in any one of claims 1 to 2.
6. A non-transitory computer readable storage medium, instructions in which, when executed by a processor of an electronic device, enable the electronic device to perform a method of implementing a transmission line routing length estimation method as claimed in any one of claims 1 to 2.
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| CN105404754A (en) * | 2015-12-09 | 2016-03-16 | 浪潮电子信息产业股份有限公司 | Method for evaluating SI signal quality based on POWER influence |
| CN109086546A (en) * | 2018-08-22 | 2018-12-25 | 郑州云海信息技术有限公司 | Signal link signal quality evaluating method, device, equipment and readable storage medium storing program for executing |
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