JPH03257674A - Printed wiring board designing system - Google Patents

Abstract

PURPOSE:To easily and exactly grasp a connecting relation mutually between parts by an operator by displaying matrix-shaped hierarchical tree structure based on the data base of the connecting relation between the center parts and respective parts to be connected to these center parts in part arranging work. CONSTITUTION:While utilizing a data base 1 for CAD previously storing parts information and the information of connection between parts, an arithmetic means 10 designates the parts to be arranged as the center on a printed wiring board, extracts all the parts connected with the center parts in the manner of tree structure from the data base to decide the display position of the parts, displays the tree structure of the respective parts on the screen of a display means 20 while adding the connecting relation between the respective parts, and executes the optimum arrangement of parts on the screen of the display means 20. Thus, the connecting relation between parts can be easily grasped and the optimum part arrangement can be efficiently expressed.

Description

[Detailed description of the invention] [Summary] CA D (Computer Aided Desi
Regarding a printed wiring board design system that uses GN) to place parts of a printed wiring board on the screen, the parts that are placed on the printed wiring board as the core during component placement work in the printed wiring board design system. By effectively utilizing and processing the connection information stored in the database to provide a visually easy-to-understand format for the parts to be used and all the parts in their connection relationships, it is possible to grasp the connection relationships between the parts. With the aim of facilitating the process and realizing optimal component placement, the calculation means is installed as a core on the printed wiring board using a CAD database that stores component information and connection information between components in advance. Specify the parts to be placed in the database, extract all parts connected to the core part in a tree structure from the database, determine the display position of the parts, and display each part in the tree structure on the screen of the display means. Furthermore, by adding and displaying the connection relationships between each component, the optimal component arrangement can be performed on the screen of the display means.

[Industrial application field]

The present invention relates to a printed wiring board design system, and particularly to a C
A D (Computer Aided Design
The present invention relates to a printed wiring board design system for arranging printed wiring board components on a screen using n).

The optimal placement of parts on printed wiring boards using CAD is highly dependent on the proficiency of the operator.
This is an impediment to reducing the time required for the component placement process.

Therefore, there is a need for a printed wiring board design system that particularly improves the work efficiency of component placement.

[Prior Art] Conventionally, a printed wiring board design system that automatically designs a printed wiring board using an interactive pattern editor system having CAD component placement commands is
[As shown in 211, part number.

Specifications such as model name 1 Information on circuit diagrams and parts lists 2 Information necessary for pattern design such as connection information between parts is stored in advance in a database 1 2 A preprogram for CAD 2 A processor 3 having a built-in memory as an arithmetic processing unit , a keyboard 4 for inputting component designation data, a tablet (or mouse) 5 for manually adjusting component placement, etc. or inputting component designation data, and connections between each component 2 component placement screens, printed wiring board screens, etc. and a display 6 for displaying the screen.

Conventionally, in such a printed wiring board design system, the work of arranging components on a printed wiring board was first performed using C.
Using the AD database 1, parts to be centrally placed on the printed wiring board, such as ICI, can be manually arranged from the keyboard 4 or from a tablet (or mouse).
5, the core component ICI and all components connected thereto are extracted from the database 1 and internally processed by the processor 3. FIG. 4 shows this as a database for the core component ICI.

In order to display such a database in FIG. 4 on the display 6, it is displayed in the component temporary placement area 7 of the display 6 in FIG. 5 based on the core component ICI, and this core component ICI and By displaying each part that is directly or indirectly connected to this, the 6th
A database screen at the start of printed wiring board design illustrated in the figure is obtained. The screen shown in Figure 6 is a basic parts display screen that is the initial state of the database display for starting parts placement, and each part is displayed as a symbol and the connections between each part are shown. The interval is visually indicated by dotted lines or arcs.

Next, based on the screen shown in Fig. 6, the operator manually places all the parts to be placed optimally using the mouse or the stylus pen of the tablet 5, and creates a temporary arrangement of the parts shown in Fig. 7. Display the screen. At this time, the operator manually displays the optimal temporary placement in the temporary component placement area 7 while referring to the hard copy of the component information shown in FIG. 4 stored in the database 1.

The parts that have just been provisionally placed in Figure 7 are moved to the parts placement area 8 where the printed wiring board on the display 6 is always displayed as an image, and the wiring is completed at the same time, and the formal parts placement as shown in Figure 8 is completed. Display the determined screen.

In addition, as for the process after component placement, markings such as circuit codes are added to Figure 8 to create the final component placement screen, and a film for manufacturing printed wiring boards is created and printed using photo etching. By attaching it, the printed wiring board is completed.

[Problems to be Solved by the Invention] In the component placement work in such conventional printed wiring board design systems, the database screen as shown in Fig. 6 based on Fig. 4 is used as the basis for starting printed wiring board design. As shown in Figure 6, the parts connected to the core part are displayed separately, making it difficult for the operator to understand which parts are connected beyond the parts that are directly connected to the core part. Understand and recognize the hierarchical connection relationship between core parts and parts that are directly or indirectly connected to them, and manually manipulate parts arrangement while considering the optimal parts arrangement around the core parts. It was not easy to obtain the preliminary arrangement results for the parts arrangement shown in Figure 7.

As a result, the optimal degree of component placement in area 8 where the printed wiring board is displayed on the screen largely depends on the operator's proficiency with the tool, and requires trial and error and considerable ingenuity on the part of the operator. was.

Therefore, in the present invention, during component placement work in a printed wiring board design system, displays of the core components to be placed on the printed wiring board and all the components in their connection relationships are stored in a database. By effectively utilizing and processing the existing connection information and providing it in a visually easy-to-understand format, it is easy to understand the connection relationships between parts, thereby realizing optimal parts placement efficiently and quickly. The purpose is to

[Means and operations for solving the problem] In the printed wiring board design system according to the present invention to achieve the above object, the work of arranging components on the printed wiring board is performed as shown in principle in FIG. Then, using the CAD database 1 in which component information and connection information between components are stored in advance, the calculation means 10 specifies a component to be placed as a core on the printed wiring board 51), Extracting all parts connected to the part in a tree structure from the database 1, determining the display position of the part (S2), displaying each part in a tree structure on the screen of the display means 20 (S3), and By adding and displaying the connection relationships between each component (S4), optimal component placement is performed on the screen of the display means 20 (S4).
5).

Further, in the present invention, determination of the display position of the component <S2
), the calculation means 10 classifies all the components connected to the core component in a tree structure into connection systems that have no connection relationship with each other based on the terminals of the core component, and divides each connection system into the corresponding connection system. The matrix-like display position may be determined by dividing the hierarchy into a plurality of hierarchies in the direction away from the terminal.

This will be further explained using FIG.

In determining the optimal placement position of parts, calculation means 1
First, in the database as shown in FIG. 4, each terminal of the designated core component is divided into connection systems. This is the horizontal division in the tree structure shown in Figure 2.
These categories have no connection relationship with each other.

Then, each divided connection system is divided into a plurality of hierarchies as the distance from the core component increases. This is the vertical division of the tree structure shown in FIG.

Therefore, the calculation means 10 displays each part as a symbol on the screen of the display means 20 based on the new database shown in FIG. In other words, the most convenient and optimal parts arrangement will be automatically created on the screen.

In this way, the connection information between the core components and each component stored in the database can be effectively used and processed to
Realizes a hierarchical tree structure display (matrix-like),
By using this as the final database, optimal parts placement can be obtained.

〔Example〕

FIG. 9 is a diagram showing the flow of processing according to an embodiment of the present invention for arranging components for printed wiring board design using the system shown in FIG. In this embodiment, the calculation means 10 of FIG. 1 includes the program 2 and processor 3 of FIG.
The display means 20 is composed of a display 6. Further, step S2 of the calculation means 10 in FIG.
is step S21. in FIG. Corresponding to S22, step S5 corresponds to steps 351 and 352.

Below, the operation of this embodiment is illustrated in figures 1O to 15, which are diagrams illustrating each process of the database, and figure 16,
This will be explained with reference to the parts display screen shown in FIG.

First, the operator inputs the ICI from the keyboard 4 as a component to be placed as a core on the printed wiring board, or inputs the ICI from the screen C using the tablet (or mouse) 5.
The outline of the displayed part is hinted and specified in advance (step Sl in FIG. 9).

As a result, this core component ICI and all components connected to it in a tree structure are restored from the information stored in the database l as shown in FIG. 4 (step 511 in FIG. 9).

Next, the connection relationships between the core component ICI and all components connected to it in a tree structure are shown below (11 to (6)
), the hierarchical level in the tree structure of each component is determined based on the processing results of each database (Figures 10 to 15) (step 521 in Figure 9).
Note that the following procedure can be automatically executed by being processed by the processor 3 according to a program 2 prepared in advance.

(1) In the circuit diagram of the database for the core component ICI shown in Fig. 4, each terminal of each component is classified and extracted for each connection point indicated by each connection number from A deformation database is obtained in which the terminal numbers of each component and connection points ① to 0 are compared as shown in the figure.

(2) Next, based on the database shown in Figure 10, each connection point is grouped in order from ■ to 0, the terminal number of each component is displayed, and each connection point organized by
~0, centering around the core component ICI, the hierarchical level directly connected to it is Ll, the next level connected to it is L2,
By classifying each connection point of the connection system in the direction away from the core component ICI, a database divided into a plurality of hierarchies as shown in FIG. 11 is obtained. This is a classification for each connected system.

(3) Next, referring to the database in which each connection point ■~@ shown in Fig. 11 is divided into multiple hierarchies, connect the core component ICI and each terminal of each component connected to it to LO-L3.
and power supply-related level G, +P, and P,
Furthermore, if the terminals of each component are in two layers, for example, in the case of layers L1 and L2, by selecting the upper layer such as L1, the core component IC as shown in FIG.
A database is obtained in which I and each component connected to it are divided into layers consisting of LO-L3. (The hierarchy LO indicates the connection hierarchy of each terminal of the core component ICI.) (4) Based on each V# layer consisting of LO to L3 in Fig. 12, the core component ICI and this The database shown in FIG. 13 is obtained in which each connected component is classified and processed.

(5) Furthermore, LO to L3
Each connection system layered in
For each connection system connected to each terminal 1 to 7 of
, connection system V from C1, C2, RIR3 and R5
Separate into two categories. At this time, set the core component ICI to Vl.
Furthermore, from the connection relationship of the terminals of the core components, the individual connection systems are divided so that they do not cross each other as much as possible. In this way, L as shown in Figure 14 is created.
1) A database is obtained in which each connection system hierarchically divided into O to L3 is further divided into connection systems consisting of 1 to V5.

(6) From the database in Fig. 14 obtained through each processing procedure of (1) to (5), vertically layer the connection systems into LO-L3, and horizontally connect Vl to ■5. By dividing each system, a final database displayed in a matrix-like hierarchical tree structure as shown in FIG. 15 corresponding to FIG. 2 is generated.

Based on the database processing results (display positions) divided into a matrix in FIG. 15 obtained by processing in this way, the display position of each part is determined by returning to FIG. 9 (step 522 in FIG. 9). In the tree structure display area 7 of the display 6, the core component and all the components connected to it are displayed symbolically in a tree structure with the outer shapes of the components as shown in FIG. 16 (Step S3 in FIG. 9). As shown in FIG. 17, the connection relationships of each part are added to the tree structure display area 7 to display the tree structure (step S4 in FIG. 9), automatically by the CAD program 2 based on the above tree structure display, or The operator understands the connection relationships between parts and manually operates the stylus pen etc. of the tablet.
As shown in FIG. 7, each component is temporarily placed in the optimal placement position in component temporary placement area N 7 (Step 551 in FIG. 9), and this temporary placement is always displayed as an image on the printed wiring board on the display 6. Move to component placement area 8, complete the wiring at the same time, and complete the formal component placement as shown in Figure 8 (No. 9).
The screen of step 552) in the figure is obtained.

〔Effect of the invention〕

As explained above, according to the printed wiring board design system according to the present invention, component placement work is performed using a matrix-like hierarchical tree based on a database of connection relationships between a core component and each component connected to it. Since the structure has been displayed, the operator can easily and accurately grasp the interconnection relationships between the parts, and can quickly arrange the parts optimally.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of the printed wiring board design system according to the present invention, Fig. 2 is a diagram explaining the operation of the component tree structure according to the present invention, and Fig. 3 is a diagram explaining the hardware of the printed wiring board design system. FIG. 4 is a diagram showing an example of circuit information stored in the database. FIG. 5 is a diagram showing an example of a display screen. FIG. 6 is a diagram showing an example of the circuit information stored in the database. Figure 7 is a screen display of circuit information from the database as an initial component display; Figure 7 is a screen display of temporary component placement; Figure 8 is a screen display after formal component placement; Figure 9 is 10 to 15, which are flowcharts illustrating the arithmetic processing operations of the database according to the embodiment of the present invention, use and process the data stored in the database, classify parts into layers, and finally FIG. 16 is a diagram showing a tree structure of parts divided into matrix according to the present invention on a screen, and FIG. FIG. 6 is a screen display diagram when connection information is added to each component. In FIG. 1, 1...database, 10...arithmetic means (program 2. processor 3),
20...Display means (display 6). In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) C that stores component information and connection information between components in advance
Using the AD database (1), the calculation means (10
) specifies a component to be placed as a core on a printed wiring board (S1), extracts all components connected to the core component in a tree structure from the database (1), and extracts all components that are connected to the core component in a tree structure (S1). By determining the display position (S2), displaying each part in a tree structure on the screen of the display means (20) (S3), and adding and displaying the connection relationship between each part (S4), the display means (20) A printed wiring board design system characterized by performing optimal component placement on the screen (S5). (2) When the calculation means (10) determines the display position of the component (S2), the calculation means (10) connects all components connected to the core component in a tree structure with respect to each other based on the terminal of the core component. 2. The matrix-like display position is determined by dividing each connection system into a plurality of hierarchies in the direction away from the terminal. Printed wiring board design system.