JPH05314218A - Printed circuit board designing system - Google Patents

Abstract

PURPOSE:To select whether a power supply signal terminal is connected in an internal layer or an external layer in the stage of generating the designing data base of a printed circuit board. CONSTITUTION:This system is provided with an information input means 3 for inputting connection selecting information for designating the connecting method of the power supply signal terminal and a power supply signal terminal connection selecting means 10 for selecting the connecting method for each power supply signal terminal of parts based on the connection selecting information inputted by the information input means 3, preserved circuit diagram information and the attribute information of a parts terminal and for setting preserving the selected connecting method of the power supply signal terminal in a layout data base 5. Thus, the power supply signal terminal for supplying power and the power supply signal terminal to be connected in the external layer can be set in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board design system, and more particularly to a design system in which a connection processing method for power signal terminals can be selected.

[0002]

CAD systems are widely used in the design of printed circuit boards. In this CAD system, a design database for carrying out a mounting design is first generated based on the circuit diagram information. The design database for performing this mounting design also includes connection processing information for power supply signal terminals (hereinafter referred to as V / G pins).

It is known that the V / G pin is connected to the inner layer solid surface, and in the conventional design system, all V / G pins are connected.
The / G pin was treated as this inner layer connection.

[0004]

However, in such a conventional design system, since all V / G pins are processed as inner layer connections when the design database is generated, the design of the printed circuit board after manufacturing is changed. When it is necessary to enable power supply, manually specify each V / G pin other than the power supply of the mounted component that is the target of the design change in the layout drawing of the printed circuit board. It was necessary to change to a so-called outer layer connection, in which the V / G pin is connected to the outer layer. The change from the inner layer connection to the outer layer connection has a problem in that there is a trade-off with other wiring patterns, and there is a problem that the correction requires complicated work.

The present invention has been made to solve the above-mentioned problems, and V / V in a post-process of designing a printed circuit board is performed.
An object of the present invention is to provide a printed circuit board design system that allows selection of V / G pin connection between an inner layer and an outer layer in a step of generating a printed circuit board design database in order to simplify the G pin connection process. ..

[0006]

That is, according to the present invention, in a printed circuit board design system for generating a design database necessary for mounting design of a printed circuit board based on circuit diagram information and the like and promoting the mounting design, Based on the information input means for inputting the connection selection information designating the connection method, the connection selection information input by the information input means, the stored circuit diagram information and the attribute information of the component terminals, the V / G pin of the component Select the connection method for each and select the selected V
And a power signal terminal connection selection means for setting and storing the connection method of the / G pin in the design database, and the V / G pin for power supply and the V / G pin connected in the outer layer can be set in advance. And

[0007]

In the above construction, the information input means inputs the connection selection information for connecting the V / G pins other than the power supply V / G pin to the outer layer. The power supply signal terminal connection selecting means determines the specified component based on the input selection information about the connection of the V / G pin, the circuit diagram information already stored, and the information indicating the attribute of each pin of the component. V / G pins other than power supply V / G pins are connected to the outer layer, and other power supply V / G pins and V / G of other parts
The connection method of the V / G pins is selected so that all the pins are inner layer connections. The V / G pin connection method selected by the power supply signal terminal connection selection means is stored in the database as V / G pin connection information.

As a result, the design data is automatically created in advance so that the V / G pins other than the power supply V / G pin for the predetermined component are connected to the outer layer in advance, so that it is not necessary to make corrections after the design, and the printed circuit board V in the post-design process
The / G pin connection process can be simplified and the design period can be shortened as compared with the conventional system.

[0009]

Embodiments of the present invention will be described below with reference to screens. FIG. 1 shows a design system (CA
It is a block diagram which shows the schematic structure of D). In the figure, 1 and 2 are a display device and an input device for displaying and inputting information necessary for designing in a conversational manner, and 3 is an information input means for receiving the information input by the input device 2. Reference numeral 4 is a design data generating means for generating design data based on the information necessary for designing from the information input means 3 and the storage means, and 5 is a design database for storing the generated design data. In the design database 5, in addition to the design data 6 generated by the design data generating means 4, the circuit diagram information data 7 and the parts library 8 used for generating the design data are stored. The circuit diagram information data 7 includes circuit diagram information such as a list of used components and a signal name list of component terminals. The component library 8 contains information such as the shape of the component, the number of terminals, and the attributes of the component terminals. Reference numeral 9 is a display means for displaying the design data generated by the design data generation means 4 and desired information in the design database 5 on the display device 1. Further, 10 is a power signal terminal connection selection means for selecting the V / G pin connection method provided in the design data generation means 4, and the V / G pin connection method selected here is the design database 5 Set within.

Next, with reference to the flow chart of FIG. 2, the operation of the power supply signal terminal connection selecting means 10 in the above structure will be described.

First, in the initial stage of design data generation, a selection request for V / G pin connection is input through the input device 2 to activate the power supply signal terminal connection selection means 10. Next, in step 21, connection selection information designating whether or not to connect the V / G pin to the outer layer is input from the input device 2, and the information input means 3 detects this and passes it to the power signal terminal connection selection means 10. Upon receiving the connection selection information, the power signal terminal connection selection means 10 reads the circuit diagram information data 7 and the component library 8 from the design database 5 in step 22.

Next, at step 23, it is judged from the connection selection information inputted at step 21 whether or not each part is a part (V / G processing flag ON) for selecting the outer layer connection of the V / G pin. For the parts for which the V / G processing flag is ON, based on the information read in step 22, step 24
In step 25, the attribute of the V / G pin of the component is taken out, and in step 25, the V / G pin for power supply or the V other than power supply
/ G pin is determined.

[0013] In step 25, the V /
For the G pin, the processing method for the outer layer connection is selected in step 26. In step 25, V / G other than power supply
For the pins that are determined to be pins and the V / G pins of the components that are determined to be OFF in the V / G processing flag in step 23, the processing method for the inner layer connection is determined in step 27.

FIG. 3 shows an example of connecting V / G pins of a component (for example, IC) mounted on a printed board. In the figure, 31 is a V / G pin for power supply which is connected to the inner layer power supply layer through a through hole, 32 is a V / G pin 31 for power supply and V other than the power supply which is connected by a wiring pattern 33 on the outer layer. / G pin.

In this way, the power supply signal terminal connection selecting means 1
0 selects whether to connect the V / G pins of all components mounted on the printed circuit board to the inner layer power supply layer (inner layer connection) or the power supply V / G pin and the wiring pattern (outer layer connection). The connection information of the V / G pin determined in this way is incorporated in the design data 6 and saved.

In the above embodiment, the case where the V / G pin connection is set in the initial stage of design data generation has been described, but a function of automatically switching the V / G pin connection is realized during the design work. The object of the present invention can also be achieved by this.

As is apparent from the above description, in the above design system, the V / G pins other than those for power supply are automatically processed to the outer layer connection as shown in FIG. 3 only by designating the connection method. Then, implementation design is performed. This allows
The V / G pin connection process in the subsequent process of the printed circuit board design can be simplified, and the design period can be shortened compared to the conventional case.

[0018]

As described above, according to the present invention,
V / G pins other than V / G pins for power supply are automatically created in advance so that the design data is connected to the outer layer, so there is no need to modify them after designing, and V / G pins in the post process of printed circuit board design are eliminated. The connection process can be simplified, and the design period can be shortened compared to the conventional system. This effect becomes remarkable especially in a large-scale printed circuit board design.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a processing procedure of a power supply signal terminal connection selecting means according to the present invention.

FIG. 3 is a diagram showing a connection example of V / G pins of a printed circuit board.

[Explanation of symbols]

 1 ... Display device 2 ... Input device 4 ... Design data generation means 5 ... Design database 6 ... Design data 7 ... Circuit diagram information data 8 ... Component library 10 ... Power signal terminal connection selection means

Claims (1)

[Claims] 1. In a printed circuit board design system for generating a design database necessary for printed circuit board mounting design based on circuit diagram information and the like, and inputting connection selection information designating a connection method of power supply signal terminals in a printed circuit board design system. Based on the information input means to be connected, the connection selection information input by this information input means and the stored circuit diagram information and attribute information of the component terminals, the connection method is selected for each power supply signal terminal of the component,
Power supply signal terminal connection selecting means for setting and storing the connection method of the selected power supply signal terminal in the design database, and making it possible to preset the power supply signal terminal for power supply and the power supply signal terminal connected in the outer layer. A printed circuit board design system featuring.