JPS63115273A - Cad system - Google Patents

Abstract

PURPOSE:To shorten the time required for design route check DRC by subjecting only a wiring pattern to DRC if this wiring pattern is corrected. CONSTITUTION:A DRC module 4 checks whether intervals of respective wiring patterns are proper or not. If the interval of a certain wiring pattern is improper, an error flag 5c is set. When an operator corrects this wiring pattern, a correction flag 5b is set. The DRC module 4 checks again whether the interval of the wiring pattern where the correction flag 5b is set is proper or not. Since only the wiring pattern is subjected to DRC if error exists in pattern information corresponding to this wiring pattern and this wiring pattern is corrected, the time required for DRC is considerably shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a CAD system used when designing a wiring pattern of a printed wiring board.

(Prior art) Conventionally, when designing a wiring pattern for a printed wiring board using a CAD system, after inputting each figure (pattern, land, etc.), it is necessary to check whether the spacing between each figure is appropriate. It is necessary to check whether

This check is called a design rule check (hereinafter referred to as DRC), and in general CAD systems, this DRC is performed by calculation.

There are two methods for DRC, one is to check each time graphic information is input, and the other is to check it all at once once the input of graphic information is completed.The latter method is to check the entire graphic information. There is a method in which a specific range of graphic information is designated and a check is performed.

The method shown in FIG. 4 is generally used as a process for performing DRC all at once once input of graphic information has been completed.

First, once the input of graphical information indicating the arrangement and wiring of components is completed using the CRT display and keyboard (step A), DRC is subsequently performed and the error status is displayed on the CRT display (step B).

Then, when the error is corrected using the keyboard (
Step C), DRC is applied again to all the graphic information (Step D).

If an error exists at this stage, the error must be corrected again, but in this case, DR
C is also performed again.

In other words, in conventional CAD systems, DRC is applied to all patterns every time an error is corrected, so there is a problem in that it takes a considerable amount of time to actually complete the graphic input. .

For example, applying DRC to all graphic information may require several hours.

On the other hand, according to a method in which DRC is performed every time graphic information is input, a considerable amount of time is required for calculation processing, and the speed of interactive processing becomes extremely slow.

(Problems to be solved by the invention) The present invention was made in view of the above-mentioned circumstances.
The object of the present invention is to provide a CAD system that can perform RC extremely efficiently and significantly shorten the time required for circuit design.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a graphic information storage means for storing graphic information such as wiring patterns and land patterns, and a D for each graphic information.
In a printed wiring board CAD system comprising a graphical information checking means for performing RC and a graphical information inputting means for inputting corrected graphical information, when the graphical information checking means performs DRC, the graphical information storage means When information indicating the check result is added to each piece of graphic information in the graphic information, and when a correction input of the graphic information is performed from the graphic information input means, information indicating the fact of modification is added to the modified graphic information, and the The next means of checking information is DRC.
When performing DRC, DRC is performed only on graphic information to which information indicating the fact of the modification is added.

(Function) In the CAD system of the present invention, when the graphic information checking means performs DRC, information indicating the check result is added to each piece of graphic information in the graphic information storage means, and the graphic information is corrected from the graphic information input means. When the input is performed, information indicating the fact of modification is added to the modified graphic information, and when the graphic information checking means next performs DRC, the graphic information to which the information indicating the fact of modification has been added is added. D only for
Since RC is performed and DRC is not performed on other graphic information, the time required for DRC is significantly reduced.

(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the CAD system of the present invention.

In the figure, 1 is a display device such as a CRT display that displays each figure (pattern, land, etc.), 2 is a pointing device for inputting and modifying figure information, and 3 is a CP'U 14 that controls the entire system, as will be described later. A DRC module 5 is a memory for storing graphic information.

FIG. 2 is a diagram conceptually showing the storage contents of the memory 5 in the system of this embodiment.

In the memory 5 of the system of this embodiment, there is graphic information 5a indicating the type, shape, layer, etc. of the graphic corresponding to each mutually independent wiring pattern on the design space, and this graphic information 5a has been modified or added. A correction flag 5b indicating whether the graphic information is correct or not, and an error flag 5G indicating whether or not there is an error in this graphic information are stored.

FIG. 3 is a diagram showing the process of actually designing a circuit using the system of this embodiment.

First, it is assumed that the graphic arrangement and wiring processing have been once completed as indicated by P1 in FIG. At this stage, new input has been made, so all the correction flags 5b shown in FIG. 2 are ON.

Next, the DRC module 4 checks whether the intervals between each wiring pattern are appropriate.

First, the pattern A1 is selected as a check target, and the distance between the wiring pattern A1 and the wiring pattern A2 existing around the wiring pattern A1 is checked.

Similarly, the intervals between the wiring patterns A2 and A3 and between A2 and A4, and the intervals between the wiring patterns A3 and A4 and between A3 and A5 are respectively checked.

At this time, if any interval between the wiring patterns A1 and A2 is inappropriate, an error display P2 is displayed and the error flags 5C corresponding to the wiring patterns A1 and A2 are both turned ON.

Next, as shown at P3 in FIG. 3, when the operator corrects the wiring pattern A1, the correction flags 5b of the wiring patterns A1 and A2 are both turned ON, and the correction flag 5b of the black wiring pattern is turned ON. It is turned off.

Then, the DRC module 4 again checks which interval between the wiring patterns A1 and A2 for which the correction flag 5b is ON is appropriate. If there is no error, all processing ends here.

If there is an error, wiring patterns A1 and A2
Which error flag 5C is turned ON, and thereafter error correction and DRC are repeated.

Thus, in the CAD system of this embodiment, if there is an error in the graphic information corresponding to a certain wiring pattern and the error is corrected, the CAD system will only be used for that wiring pattern.
Since RC is applied, the time required for the second and subsequent DRCs is significantly reduced compared to conventional CAD systems.

In this embodiment, a case has been described in which the present invention is applied to check the pattern and land spacing of a printed wiring board, but the present invention can also be applied to check wiring connection information, etc.

Further, in this embodiment, a flag is used to indicate the presence or absence of an error and to indicate the presence or absence of a correction input, but the present invention is not limited to this, and the flag is used as information that serves as a judgment criterion when performing DRC. Other indicators may be added if necessary.

[Effects of the Invention] As explained above, in the CAD system of the present invention, DRC is applied only to the graphical information of wiring patterns for which correction input or additional input has been performed, so the time required for DRC is significantly reduced. , circuit design can proceed efficiently.

[Brief explanation of the drawing]

Fig. 1 is a blower diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a diagram conceptually showing the storage contents of the memory in the embodiment, and Fig. 3 is an illustration of the flow of operation of the system of the embodiment. The explanatory diagram, Fig. 4, shows D in the conventional CAD system.
FIG. 3 is a diagram showing a process of performing RC. 1...Display device 2...Pointing device 3...
・・・・・・・・・CPU 4・・・・・・DRC module 5・・・・・・
...Memories A1 to A5...Wiring pattern applicant Toshiba Corporation Patent attorney Suyama Sa M171 ×
t sori - condolence 0 kyou

Claims (2)

[Claims] (1) Comprising a graphical information storage means for storing graphical information such as wiring patterns and land patterns, a graphical information checking means for checking design rules for each graphical information, and a graphical information inputting means for inputting corrections to the graphical information. In the CAD system for printed wiring boards,
When the graphic information checking means performs a design rule check, information indicating the check result is added to each piece of graphic information in the graphic information storage means, and correction input of the graphic information is performed from the graphic information input means. When information indicating the fact of modification is added to the modified graphic information, and when the graphic information checking means next performs a design rule check, the graphic information to which the information indicating the fact of modification has been added is A CAD system characterized in that it is configured to only perform a design rule check. (2) C according to claim 1, wherein the information indicating the check result added to the graphic information and the information indicating the fact of modification are expressed by flags added to each graphic information
AD system.