JPH04205189A - Design inspecting method for printed wiring board - Google Patents

Abstract

PURPOSE:To reduce man-hours and erroneous input by substituting grouping data which are outputted from a wiring inspection program for logical connection data which are manually inputted and correcting only an intended part. CONSTITUTION:The logical connection data which are manually inputted before are automatically generated by copying the grouping data in a logical connection information file. The logical connection data which are automatically generated includes erroneous input at the time of layout designing with high possibility, so the erroneous input is pointed out and correcting operation is newly required. This operation is relatively easy by pointing out different point erroneous (input) by matching the data with a logical circuit diagram. Thus, the logical connection data after the erroneous input is corrected and the original grouping data are inputted to a wiring inspection program and the position of erroneous wiring at the time of the layout designing is found from the acceptance/rejection decision result. Consequently, the man-hours and erroneous input are reducible.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to automatic inspection of printed wiring board designs using CAD, and is particularly suitable for inputting logical connection data that serves as a criterion for determining pass/fail of wiring designs. The present invention relates to a method for inspecting wiring on a printed wiring board.

[Conventional technology]

Figure 2 shows the main structure of the printed wiring board. A connector terminal 2 provided at the edge of the printed wiring board 1 receives an electrical signal from an external device and guides it to a terminal hole 5 of a mounted component 4 through a conductor pattern 3. Then, the electrical characteristics are changed within the component, and the signal is again sent to the connector terminal 2 via the conductor pattern 3 and transmitted to an external device. If there is an obstacle on the way to the wiring of the conductive pattern 3, a pier hole 6 is provided in the printed wiring board 1 so that the wiring passes through the back side. Next, FIG. 1 shows a CAD system configuration that handles the above-mentioned wiring design. The layout design program is a program that displays patterns on the screen and allows the user to arbitrarily arrange them on the printed wiring board, and the layout data is registered in the wiring information file. For example, the third
When designing the layout of a printed wiring board as shown in the figure, connector terminals 29 component terminal holes 5. A data table having graphic information of the conductor pattern 3 is generated.

However, at this point, there is no connection information between the data.

Therefore, a looping program is used to read the graphic information in the wiring information file and perform a process of combining the data of mutually connected figures into one. Through this process, the data of the connector terminal A in FIG. 3 and the 1st pin of the resistor A are combined into one group, and the data of the 2nd pin connector terminal B of the resistor A are combined into one group.

This grouping data is output to a grouping information file. On the other hand, the logic connection data, as shown in FIG. 4, is a collection of abbreviations of patterns connected as the same signal from the logic circuit diagram in units of signals. This data is manually registered in the logical connection information file. Then, the grouping data and logical connection data are compared and verified by the wiring inspection program, and only the different data is outputted as connection failure data to the same/different determination result file. If connection failure data is output to the same/different determination result file, the user reviews the logical connection data, further reviews the layout diagram of the printed wiring board, and redoes the design.

In this way, when there is no connection failure data in the same-difference determination result file, the data in the wiring information file is outputted as drawing data, photo film data, mounting parts automatic insertion data, etc. by a computer-based automatic production system (CAM). This series of operations is shown in Figure 5.

[Problem to be solved by the invention]

In the above conventional technology, when inputting logical connection data, the user inputs it while referring to a logic circuit diagram, which is originally completely accurate data, but human input errors occur in the logical connection data, which causes a decrease in reliability. was.

Further, in the above-mentioned conventional technology, all the logical connection data is input manually, which requires a large amount of man-hours.

An object of the present invention is to simplify the manual creation of logical connection data and reduce the number of man-hours, and also to accurately identify input errors and improve reliability.

[Means to solve the problem]

The above object is achieved by substituting the grouping data output from the wiring inspection program for the logical connection data that has conventionally been input manually, and by modifying only the desired portions.

[Effect]

Since the grouping data is organized in the same format as the logical connection data, there is no need to modify the program by substituting the grouping data for the logical connection data, and it is only necessary to copy the grouping data to the logical connection information file.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1.2.3.

Using the layout design program shown in FIG. 1, layout data is created with reference to the logic circuit diagram and registered in the wiring information file.Next, the grouping program performs graphic operations on the layout data and outputs grouping data. Here, as shown in the lower part of FIG. 3, the grouping data 7 is represented by a combination of abbreviations for component terminal holes and connector terminals. This is the same format as the logical connection data 8 shown at the bottom of FIG. Therefore, the logical connection data 8, which was conventionally input entirely manually, can be automatically generated by copying the grouping data 7 to the logical connection information file. However, there is a high possibility that the automatically created logical connection data includes mistakes made by people who designed the layout, so new work is required to detect and correct input errors. This work is as follows: 1) Grouping data is output in alphabetical order by the grouping program.

2) Output in signal units.

Check the logic circuit diagram for reasons such as differences (input mistakes)
It is relatively easy to detect. The logical connection data with input errors corrected in this manner and the original grouping data are input into the wiring inspection program, and the position of the wiring error during layout design is determined from the pass/fail determination result. The parts with wiring errors are rewired using the layout design program. Then, it is rewritten through the grouping program and wiring inspection program until it is passed in the pass/fail judgment. If the test passes, the layout data is transferred from the wiring information file to the CAM system and the wiring inspection is completed.

〔Effect of the invention〕

According to the present invention, parts other than the logical connection data correction section can be automatically created, which has the effect of reducing the number of man-hours.

In addition, automatic generation of logical connection data reduces input errors and improves reliability.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a CAD system for printed wiring boards, Figure 2 is a configuration diagram of a printed wiring board, Figure 3 is a layout diagram of a printed wiring board, Figure 4 is a logic circuit diagram, and Figure 5 is a CA
It is a design flow diagram of a printed wiring board by D. 1. Printed wiring board, 2. Edge connector terminal, 3
. . . Conductor pattern, 4. Mounted components, 5. Component terminal holes, 6. Pier holes, 7. Grouping data, 8. Logical connection data. Agent Patent Attorney Katsuma Ogawa ≧ '−j− Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] 1. A program that calculates graphic data such as edge connector terminals, conductor patterns, component terminal holes, via holes, etc. (hereinafter referred to as patterns) on a printed wiring board, and the connection status of the shapes to obtain one data on how the shapes are connected to each other. The program consists of a program that compares the data in which shapes are connected together (hereinafter referred to as grouping data) with the connection data of the pattern input by the user to check the connection. If a wiring error is discovered in the data that has been executed, the grouping data of the pattern output by the program is corrected by the amount of the wiring error, and is substituted for the connection data of the pattern input by the user. Board design inspection method. 2. When a part of the wiring of an already completed printed wiring board is changed and a new design is created, the grouping data of the pattern output by the program is modified by the amount of the change and is used in place of the connection data input by the user. A method for designing and inspecting a printed wiring board according to claim 1.