WO2020000948A1

WO2020000948A1 - Method, apparatus and device for generating route keep out region for differential pair pad, and medium

Info

Publication number: WO2020000948A1
Application number: PCT/CN2018/123474
Authority: WO
Inventors: 付深圳
Original assignee: 郑州云海信息技术有限公司
Priority date: 2018-06-28
Filing date: 2018-12-25
Publication date: 2020-01-02
Also published as: CN109033528B; CN109033528A

Abstract

Disclosed are a method, apparatus and device for generating a route keep out region for a differential pair pad, and a computer-readable storage medium. The method comprises: externally expanding, based on an external expansion distance, the shapes of two pads of differential pair pins in a circumferential direction to form a first path and a second path; respectively selecting two points on the first path and the second path based on the shape of each pad, and connecting the four points in the same direction to form a third path; deleting an intersecting part of the third path and the first path and an intersecting part of the third path and the second path to form a fourth path; and generating a route keep out region for the differential pair pads according to the type of the differential pair pins, wherein the shape of the region is the same as the shape of the fourth path. By means of the present application, rapidly and accurately positioning a route keep out region for a pad is realized, and the defects of a low efficiency, a low accuracy and shape-misfitting brought about by manual processing are remedied, thereby effectively shortening the design cycle of a PCB, improving the design efficiency of the PCB and improving the transmission quality of differential signals, thus ensuring the design quality of the PCB.

Description

Method, device, device and medium for generating differential pair pad avoiding routing area

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 28, 2018, with an application number of 201810687159.3, and the invention name is "Method, Device, Device, and Medium for Generating Differential Pair Pad Avoiding Routing Areas" The entire contents of which are incorporated herein by reference.

Technical field

Embodiments of the present invention relate to the technical field of printed circuit board design, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for generating a evaded routing area of a differential pair pad.

Background technique

With the development of printing technology, users have increasingly higher quality requirements for printed circuit boards (PCBs), and more and more corresponding PCB design software. Cadence is the most widely used software in the industry. Not only does it have powerful functions and a variety of related software to support it, but also because it provides an open secondary development interface and a more comprehensive development language library, users can develop according to their own needs.

Skill language is a high-level programming language based on C language and LISP language built in Cadence software. Skill language can be used as the simplest language tool or as a powerful programming language for developing any application. The Skill language can interact with the underlying system and provides a rich interface to access Cadence's various tools. Users can access it through the Skill language and can develop their own tools based on the Cadence platform.

In the late stage of PCB design, layout engineers need to perform route keepout processing on differential pair pads (PADs), that is, areas where pads cannot be routed. In the prior art, routes are generally manually created manually. For large PCB boards, especially large server motherboards, the number of differential pairs is large, manual processing is slow, and the production efficiency of avoiding routing areas is too low; and the shapes manually processed manually ( (Such as circles, ellipses, irregular rectangles, etc.) cannot match the shape of the differential pair PAD, the accuracy is lower, and the quality of the differential signal is affected.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a method, an apparatus, a device and a computer-readable storage medium for generating a circumvention routing area of a differential pair pad, which can quickly and accurately locate the circumvention routing area of a PAD, which compensates for manual processing The defects of low efficiency, low precision, and mismatched shapes greatly improve the PCB design efficiency and the transmission quality of differential signals.

To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

An embodiment of the present invention provides, on the one hand, a method for generating an avoidance routing area of a differential pair pad, based on a skill language, including:

Acquiring the shape of the pads of a pair of differential pair pins in the component to be designed, and expanding the shape of each pad along the circumference according to the outer expansion distance to form a first path and a second path;

Based on the shape of each pad, two points are selected in the first path and the second path, respectively, so that the lateral length of the third path formed by connecting four points in the same direction is greater than the first path and the The maximum lateral length of the second path, and the lateral direction is a direction perpendicular to the connecting direction of the center points of the two pads;

Deleting an intersection of the third path and the first path, the third path and the second path to form a fourth path;

According to the type of the differential pair pins, an avoidance routing area of the differential pair pad is generated; the shape of the avoidance routing area is the same as the shape of the fourth path.

Optionally, the avoidance routing area generated as a differential pair pad according to the type of the differential pair pin includes:

Judging whether the differential pair pins are through-hole or patch-type;

If the differential pair pins are of a patch type, a circumvention routing area is created on two layers adjacent to the differential pair pad, and the shape of each circumvention routing area is the same as the shape of the fourth path;

If the differential pair pins are through-holes, avoidance routing areas are created in all layers, and the shape of each avoidance routing area is the same as the shape of the fourth path.

Optionally, the external expansion distance is 1 mil.

Optionally, the two points selected on the first path and the second path based on the shape of each pad include:

The shape of each pad is circular or elliptical. The tangent points on the longitudinal tangent lines of the first path and the second path are selected, and the longitudinal direction is a direction parallel to the line connecting the center points of the two pads.

Optionally, the third path is a rectangle formed by connecting four points clockwise or counterclockwise.

According to another aspect of the embodiments of the present invention, a device for generating a trace-avoiding area of a differential pair pad includes:

The pad extension module is used to obtain the pad shape of a pair of differential pair pins in the component to be designed, and expand each pad shape along the circumference according to the extension distance to form a first path and a second path;

A third path generating module is configured to select two points on the first path and the second path respectively based on the shape of each pad, so that the lateral length of the third path formed by connecting four points in the same direction Greater than the maximum lateral length of the first path and the second path, and the lateral direction is a direction perpendicular to the connecting direction of the center points of the two pads;

A fourth path generation module, configured to delete the third path and the first path, and the intersection of the third path and the second path to form a fourth path;

The avoidance routing area generating module is configured to generate an avoidance routing area of a differential pair pad according to the type of the differential pair pin; the shape of the avoidance routing area is the same as the shape of the fourth path.

Optionally, the route avoidance area generation module includes:

A through-hole avoidance routing area generation sub-module is used to create a avoidance routing area on two layers adjacent to the differential pair pad if the differential pair pins are of a patch type, and the shape of each avoidance routing area The shape is the same as the fourth path;

A patch-type avoidance routing area generation sub-module is used to create avoidance routing areas on all layers if the differential pair pins are through holes, and the shape of each avoidance routing area is the same as the shape of the fourth path .

Optionally, the third path generation module has a circular or elliptical shape for each pad, and selects a tangent point on a longitudinal tangent line of the first path and the second path, and the longitudinal direction is the center of the two pads. Modules in which points are connected in parallel directions.

An embodiment of the present invention further provides a generation device for avoiding a routing area of a differential pair pad, which includes a processor and a memory, and the processor is configured to execute the computer program stored in the memory as described in any one of the preceding items. Steps of a method for generating a bypass area for a differential pair pad.

Finally, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a generation program for the avoidance routing area of the differential pair pad, and the avoidance routing area of the differential pair pad. When the generating program is executed by the processor, the steps of the method for generating a routing area for avoiding the differential pair pads according to any one of the foregoing are implemented.

An embodiment of the present invention provides a method for generating an avoidance routing area of a differential pair pad, and expands the shape of two pads of the differential pair pin along the circumference according to an outer expansion distance to form a first path and a second path; Based on the shape of each pad, two points are selected in the first path and the second path, and the four points are connected in the same direction to form a third path; the intersection of the third path and the first path, the third path, and the second path are deleted To form a fourth path; according to the type of the differential pair pin, an avoidance routing area of the differential pair pad is generated, and the shape of the area is the same as that of the fourth path.

The advantage of the technical solution of the present application is that the avoidance routing area corresponding to the shape of the pad is automatically generated according to the shape of the pad, and the fast and accurate positioning of the avoidance routing area of the PAD is achieved, which makes up for low manual processing efficiency and low accuracy. Defects and mismatched shapes effectively reduce the PCB design cycle, help to improve the PCB design efficiency of engineers, reduce the impact of impedance discontinuities, and improve the transmission quality of differential signals, thereby ensuring the quality of PCB design. In addition, automatic generation The shape of the circumvented routing area is regular, accurate and beautiful.

In addition, the embodiment of the present invention also provides a corresponding implementation device, device, and computer-readable storage medium for the method for generating the avoidance of the routing area of the differential pair pad, further making the method more practical. The device, device And computer-readable storage media have corresponding advantages.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely Some embodiments of the present invention, for those skilled in the art, can obtain other drawings according to these drawings without paying creative labor.

FIG. 1 is a schematic flowchart of a method for generating an avoidance routing area of a differential pair pad according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a method for generating an avoidance routing area of a differential pair pad according to a schematic example provided by an embodiment of the present invention; FIG.

FIG. 3 is a schematic flowchart of a method for generating an avoidance routing area of a differential pair pad according to another schematic example provided by an embodiment of the present invention; FIG.

FIG. 4 is a structural diagram of a specific implementation manner of an apparatus for generating a trace avoidance area of a differential pair pad according to an embodiment of the present invention.

detailed description

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 with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "first", "second", "third", "fourth", and the like in the description and claims of the present application and the above-mentioned drawings are used to distinguish different objects, not to describe a specific order . Furthermore, the terms "including" and "having" as well as any of them are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device containing a series of steps or units is not limited to the listed steps or units, but may include steps or units not listed.

After the technical solutions of the embodiments of the present invention are introduced, various non-limiting implementation manners of the present application are described in detail below.

First, referring to FIG. 1, FIG. 1 is a schematic flowchart of a method for generating a routing area for avoiding a differential pair pad according to an embodiment of the present invention. The embodiment of the present invention may include the following contents:

S101: Obtain the pad shapes of a pair of differential pair pins in the component to be designed, and expand each pad shape along the circumference according to the outer expansion distance to form a first path and a second path.

Each differential line pin (differential pair pin) corresponds to a pad, the pad has a corresponding shape, that is, a pair of differential pair pins in the component to be designed has two pads, corresponding to the shape of the two pads .

The shape of each pad is expanded outward in accordance with a preset outward expansion distance. For example, when the shape of the pad is a circle with a radius of 1cm, the outward expansion distance is 0.1cm, then the shape after expansion is A circle with the center of the current pad as the center and a radius of 1 + 0.1cm. When the shape of the pad is a square with a side length of 1 cm, and the flared distance is 0.1 cm, then the expanded shape is a square with the center of the current pad as the center and a side length of 1 + 0.2 cm.

The new pattern formed after the two pad shapes are expanded. As the first path and the second path, please refer to Figure 2 and Figure 3. The dotted line is the pad shape, and the solid line is the pad shape. For the new path formed after expansion, the external expansion pattern corresponding to the upper pad can be set as the first path, and the external expansion pattern corresponding to the lower pad can be set as the second path. Of course, the external path corresponding to the upper pad can also be set. The expansion pattern is the second path, and the external expansion pattern corresponding to the lower pad is the first path, which does not affect the implementation of the present application.

Wherein, the outer expansion distance may be 1 mil, and of course, other values may also be selected by those skilled in the art according to actual conditions, which is not limited in this application.

S102: Based on the shape of each pad, two points are selected in the first path and the second path respectively, so that the lateral length of the third path formed by connecting four points in the same direction is greater than the maximum length of the first path and the second path. Lateral length.

Among them, the horizontal direction is a direction perpendicular to the connecting direction of the center points of the two pads. Taking FIG. 2 as an example, the vertical direction is the direction of the short axis of the ellipse, and the horizontal direction is the direction of the long axis of the ellipse.

When two points are selected from the first path and the second path to generate the third path, the positions of the selected points are related to the shapes of the first path and the second path, that is, related to the shape of the pad.

The shape of the pad is circular or oval or other round shapes. You can choose the tangent point on the longitudinal tangent line of the first path and the second path. As shown in Figure 2, the two points selected on the first path are A1 and A2, and the two points selected on the second path are B1 and B2.

When the shape of the pad is rectangular or square, you can select any point on the left and right sides. When the shape of the pad is irregular, the pattern surrounded by the selected points must be the left and right sides of the first path and the second path. Included, for example, as shown in FIG. 3, the selected points can be any two points on the left and right sides, but the upper and lower sides and the points on the two sides cannot be selected.

The four points can be connected clockwise or counterclockwise. When the selected points are distributed symmetrically, the figure formed by connecting the points is rectangular.

S103: Delete the intersection between the third path and the first path, and the third path and the second path to form a fourth path.

The intersecting part of the third path and the first path or the third path and the second path is the part that covers each other, that is, the part of the third path inside the first path is deleted, and the first path is inside the third path. Partial deletion, and deletion of the third path inside the second path, and deletion of the second path inside the third path. The remaining line segments are combined into the fourth path. For details, see Figure 2 and Figure 3.

S104: Generate the avoidance routing area of the differential pair pad according to the type of the differential pair pin; the shape of the avoidance routing area is the same as the shape of the fourth path.

Differential pair pins can be through-hole or patch-type differential pair pins. Different types of pins have different settings for avoiding routing areas. The specific ones include:

Determine whether the differential pair pins are through-hole or patch;

If the differential pair pins are of the patch type, avoidance routing areas are created on two layers adjacent to the differential pair pads, and the shapes of the avoidance routing areas are the same as the shape of the fourth path;

If the differential pair pins are through holes, avoidance routing areas are created in all layers, and the shape of each avoidance routing area is the same as the shape of the fourth path.

In the technical solution provided by the embodiment of the present invention, the avoidance routing area corresponding to the shape of the pad is automatically generated according to the shape of the pad, and the fast and accurate positioning of the avoidance routing area of the PAD is achieved, which makes up for the low manual processing efficiency. The defects of low accuracy and mismatched shapes effectively reduce the PCB design cycle, help improve the PCB design efficiency of engineers, reduce the impact of impedance discontinuities, and improve the quality of differential signal transmission, thereby ensuring the quality of PCB design. , The shape of the automatically avoided routing area is regular, accurate and beautiful.

In the specific implementation process, a specific implementation method may be:

Generation of a program to avoid the trace area of the differential pair pad;

Run the script in allegro design software;

Select any differential pair PIN in the PCB design software;

Based on the SKILL language programming, an automated tool is formed. When the differential pair PIN is clicked in the PCB design, the system will automatically determine the PAD shape of the two PINs, and according to the shape and location of the two PADs, it will be cut off adjacent to the two PAD levels Copper on two levels or copper on all levels. This method can perform PIN processing on any shape differential pair through shape recognition, and solves the limitation of manual processing of irregular shapes such as ellipses and polygons in the prior art. By adopting this application, the copper skin around the PAD can be quickly and efficiently removed and the shape completely matches the shape of the PAD.

The embodiment of the present invention further provides a corresponding implementation device for the method for generating the evaded routing area of the differential pair pad, further making the method more practical. The following describes the generation device for the avoidance routing area of the differential pair pad provided by the embodiment of the present invention. The generation device for the avoidance routing area of the differential pair pad described below and the avoidance routing of the differential pair pad described above. The region generation method can refer to each other.

Referring to FIG. 4, FIG. 4 is a structural diagram of a device for generating a route avoidance area of a differential pair pad according to an embodiment of the present invention in a specific implementation manner. The device may include:

The pad extension module 401 is used to obtain the pad shape of a pair of differential pair pins in the component to be designed, and expand each pad shape along the circumference according to the extension distance to form a first path and a second path.

A third path generation module 402 is configured to select two points respectively on the first path and the second path based on the shape of each pad, so that the lateral length of the third path formed by connecting four points in the same direction is greater than the first path The maximum lateral length of the path and the second path, and the lateral direction is a direction perpendicular to the connecting direction of the center points of the two pads.

The fourth path generating module 403 is configured to delete the intersection of the third path and the first path, and the third path and the second path to form a fourth path.

The avoidance routing area generating module 404 is configured to generate the avoidance routing area of the differential pair pad according to the type of the differential pair pin; the shape of the avoidance routing area is the same as that of the fourth path.

Optionally, in some implementations of this embodiment, the route avoidance area generation 404 module may include, for example:

The through-hole avoidance routing area generation sub-module is used to create a avoidance routing area on the two layers adjacent to the differential pair pad if the differential pair pin is a patch type, and the shape and fourth path of each avoidance routing area The same shape;

The patch type circumvention routing area generation sub-module is used to create an circumvention routing area on all layers if the differential pair pins are through holes, and the shape of each circumvention routing area is the same as that of the fourth path.

Optionally, in other implementations of this embodiment, the third path generation module 402 may have a circular or oval shape for each pad shape, and select a tangent point on a longitudinal tangent line of the first path and the second path. , The longitudinal direction is a module parallel to the connecting direction of the center points of the two pads.

The functions of the functional modules of the device for generating a routing area for avoidance of a differential pair pad according to the embodiment of the present invention may be specifically implemented according to the method in the foregoing method embodiment, and a specific implementation process may refer to a related description of the foregoing method embodiment, I won't repeat them here.

It can be known from the above that the embodiments of the present invention can quickly and accurately locate the avoidance routing area of the PAD, which makes up for the defects of low manual processing efficiency, low accuracy, and mismatched shapes, and greatly improves the PCB design efficiency and the transmission quality of differential signals.

An embodiment of the present invention further provides a generation device for avoiding a trace area of a differential pair pad, which may specifically include:

Memory for storing computer programs;

A processor, configured to execute a computer program to implement the steps of the method for generating a routing area for avoiding a differential pair pad according to any one of the embodiments above.

The functions of the functional modules of the generation device for avoiding the routing area of the differential pair pad according to the embodiment of the present invention may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to the related description of the method embodiment, I won't repeat them here.

An embodiment of the present invention also provides a computer-readable storage medium that stores a generation program for avoiding routing areas of differential pair pads. The generation program for avoiding routing areas of differential pair pads is as described above when executed by a processor. Steps of the method for generating a routing area for avoiding a differential pair pad according to any one of the embodiments.

The functions of the functional modules of the computer-readable storage medium according to the embodiments of the present invention may be specifically implemented according to the methods in the foregoing method embodiments. For specific implementation processes, reference may be made to related descriptions of the foregoing method embodiments, and details are not described herein again.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments may refer 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 the relevant part may refer to the description of the method.

Professionals may further realize that the units and algorithm steps of the examples described in connection with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the hardware and software, Interchangeability. In the above description, the composition and steps of each example have been described generally in terms of functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

The steps of the method or algorithm described in connection with the embodiments disclosed herein may be directly implemented by hardware, a software module executed by a processor, or a combination of the two. Software modules can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or in technical fields Any other form of storage medium is known.

The generation method, device, device, and computer-readable storage medium of the evaded routing area of the differential pair pad provided by the present invention have been described in detail above. Specific examples are used herein to explain the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several 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.

Claims

A method for generating a routing area for avoiding differential pairs of pads, which is based on skill language and includes:

Acquiring the shape of the pads of a pair of differential pair pins in the component to be designed, and expanding the shape of each pad along the circumference according to the outer expansion distance to form a first path and a second path;

Based on the shape of each pad, two points are selected in the first path and the second path, respectively, so that the lateral length of the third path formed by connecting four points in the same direction is greater than the first path and the The maximum lateral length of the second path, and the lateral direction is a direction perpendicular to the connecting direction of the center points of the two pads;

Deleting an intersection of the third path and the first path, the third path and the second path to form a fourth path;

According to the type of the differential pair pins, an avoidance routing area of the differential pair pad is generated; the shape of the avoidance routing area is the same as the shape of the fourth path.
The method for generating an avoidance routing area of a differential pair pad according to claim 1, wherein the avoidance routing area generated as a differential pair pad according to the type of the differential pair pin comprises:

Judging whether the differential pair pins are through-hole or patch-type;

If the differential pair pins are of a patch type, a circumvention routing area is created on two layers adjacent to the differential pair pad, and the shape of each circumvention routing area is the same as the shape of the fourth path;

If the differential pair pins are through-holes, avoidance routing areas are created in all layers, and the shape of each avoidance routing area is the same as the shape of the fourth path.
The method for generating an avoidance trace area of a differential pair pad according to claim 2, wherein the externally expanded distance is 1 mil.
The method for generating an avoidance routing area of a differential pair pad according to any one of claims 1 to 3, wherein, based on the shape of each pad, the first path and the second path are respectively Picking two points includes:

The shape of each pad is circular or elliptical. The tangent points on the longitudinal tangent lines of the first path and the second path are selected, and the longitudinal direction is a direction parallel to the line connecting the center points of the two pads.
The method according to claim 4, wherein the third path is a rectangle formed by connecting four points clockwise or counterclockwise.
A generation device for avoiding a routing area of a differential pair pad is characterized in that it includes:

The pad extension module is used to obtain the pad shape of a pair of differential pair pins in the component to be designed, and expand each pad shape along the circumference according to the extension distance to form a first path and a second path;

A third path generating module is configured to select two points on the first path and the second path respectively based on the shape of each pad, so that the lateral length of the third path formed by connecting four points in the same direction Greater than the maximum lateral length of the first path and the second path, and the lateral direction is a direction perpendicular to the connecting direction of the center points of the two pads;

A fourth path generation module, configured to delete the third path and the first path, and the intersection of the third path and the second path to form a fourth path;

The avoidance routing area generating module is configured to generate an avoidance routing area of a differential pair pad according to the type of the differential pair pin; the shape of the avoidance routing area is the same as the shape of the fourth path.
The apparatus for generating an avoidance routing area of a differential pair pad according to claim 6, wherein the avoidance routing area generation module comprises:

A through-hole avoidance routing area generation sub-module is used to create a avoidance routing area on two layers adjacent to the differential pair pad if the differential pair pins are of a patch type, and the shape of each avoidance routing area The shape is the same as the fourth path;

A patch-type avoidance routing area generation sub-module is used to create avoidance routing areas on all layers if the differential pair pins are through holes, and the shape of each avoidance routing area is the same as the shape of the fourth path .
The device for generating an escaped routing area of a differential pair pad according to claim 6 or 7, wherein the third path generation module selects the first pad as a circular or elliptical shape, and selects the first pad. The tangent point on the longitudinal tangent line of the path and the second path is a module whose direction is parallel to the line connecting direction of the center points of the two pads.
A generation device for avoiding a routing area of a differential pair pad, comprising a processor and a memory, and the processor is configured to implement any one of claims 1 to 5 when executing a computer program stored in the memory. The steps of the method for generating a routing area for avoiding the differential pair pads.
A computer-readable storage medium is characterized in that the computer-readable storage medium stores a generation program for avoiding routing areas of differential pair pads, and the generation program for avoiding routing areas of differential pair pads is stored on the computer-readable storage medium. When the processor executes, the steps of the method for generating a route avoidance area of a differential pair pad according to any one of claims 1 to 5 are implemented.