JP2720802B2 - Circuit diagram CAD system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit diagram CAD (Computer Aided Design) applied when a netlist is created and printed circuit board wiring (creation of a printed circuit board drawing) is performed based on the netlist.
n) Regarding the system, in particular, a logic circuit drawing CAD system (a system that creates a logic circuit drawing and a netlist and passes the netlist to a printed circuit board CAD system) and a printed circuit board CAD system (transferred from the logic circuit drawing CAD system) (A system for creating a printed circuit board drawing by arranging and wiring components on the printed circuit board drawing using the netlist).

[0002]

2. Description of the Related Art Heretofore, in a circuit diagram CAD system of this type, the following processes (1) to (3) have been performed in accordance with instructions from a logic circuit designer and a printed circuit board designer.

A logic circuit drawing CAD system arranges each component on a logic circuit drawing based on a logic library having a library file for each component (a logic library created in advance) according to an instruction of a logic circuit designer. Perform wiring processing and create a logic circuit drawing.
Further, based on the logic circuit drawing, a process of creating a netlist (information on wiring between components and showing a mutual relationship between components as a list) is performed, and the netlist is stored in a netlist file. This netlist file is passed to the printed circuit board drawing CAD system.

[0004] The printed circuit board CAD system is
In accordance with an instruction from a printed circuit board designer, the above-described net list is used to perform a process of arranging each component on a printed circuit board drawing and a process of wiring between the components. Thereby, a printed circuit board drawing is created.

Further, the logic circuit drawing CAD system performs a process of extracting data of a component list from the logic circuit drawing according to an instruction of a logic circuit designer, and transfers the extracted data of the component list to the production management system.

By the way, in a printed circuit board drawing of a circuit (distributed constant circuit) such as a circuit relating to a microwave satellite communication device that actively uses a wireless area, a termination pattern not connected to components is intentionally created, and the termination pattern is formed. And connecting the external parts of the printed circuit board drawing,
Often done.

However, in the conventional circuit diagram CAD system, in such a case (when a termination pattern is required)
In addition, even if the netlist created by the logic circuit drawing CAD system is used in the printed circuit board CAD system to generate a termination pattern on the printed circuit board drawing, the termination pattern is not included in the netlist. Processing could not be performed. This is because the netlist is wiring information between components, and thus a termination pattern in which components exist only at one end is not included in the netlist.

For this reason, when the printed board drawing CAD system needs such information on the termination pattern, the logic circuit designer separates the processing content on the termination pattern from the instruction on the CAD information on the logic circuit drawing. It was necessary to instruct the printed circuit board designer.

[0009]

In the conventional circuit diagram CAD system described above, when it is desired to generate a termination pattern on a printed circuit board drawing for a circuit that actively uses a wireless area, a logic is provided via a netlist. The circuit drawing CAD system cannot pass data on the termination pattern to the printed circuit board drawing CAD system, and the logic circuit designer instructs the printed circuit board drawing designer on the processing contents regarding the termination pattern separately from the CAD information of the logic circuit drawing. Because of the necessity, there is a problem that an error in designation (error) by a logic circuit designer and a mistake in design by a printed circuit board designer are likely to occur in such a process.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to include a description about a virtual component for a termination pattern (hereinafter referred to as a virtual component for a termination pattern) in information on a netlist. By generating a termination pattern on a printed circuit board drawing based on the above, it is possible to prevent the occurrence of the above-mentioned "error in design by a logic circuit designer" and "design error by a printed circuit board designer".
An AD system is provided.

As a prior art relating to a CAD system corresponding to a logic circuit drawing CAD system and a printed circuit board drawing CAD system in the circuit diagram CAD system of the present invention, Japanese Unexamined Patent Publication No. 2-287678 (CAD system for logic drawing) Has been published. However, according to this conventional technique, "a hole for wiring an additional component (wiring hole) is formed in a portion where a component is not mounted in consideration of the possibility of adding a component on a substrate of a prototype or a research product. (Refer to page 494, upper left column, line 19 to upper right column, line 1 in the publication), "wiring of wiring holes is required on the board although it is not actually mounted on the board." A specific component symbol defined as being identifiable from other components actually mounted on the board and logically completely nonfunctional is assigned to the component (dummy component) to be assigned, and the specific component symbol is allocated. By generating a logic drawing file in which logic drawing information relating to a logic circuit realized by connecting various components including a dummy component is stored, and generating a netlist based on the logic drawing file, the dummy drawing file is generated. Wiring of parts Characterized in that the wire instruction holes to perform on the net list "is a (first 494 right lower column line 10, second 495, left upper column, the first row reference in the publication) art. Therefore, this prior art is based on the layout of components on a printed circuit board on a printed circuit board CAD system.
Circuit diagram C that can generate termination patterns when performing wiring processing
Its purpose and configuration are different from those of the present invention, which aims at providing an AD system.

[0012]

SUMMARY OF THE INVENTION A circuit diagram CAD system according to the present invention is a circuit diagram CAD system comprising a logic circuit drawing CAD system and a printed board drawing CAD system. A logic library having a library file corresponding to a virtual component, a printed circuit board library having a library file corresponding to a termination pattern virtual component together with a library file corresponding to a general component, and a logic circuit drawing based on the logic library. A logic circuit drawing creator that performs a placement / wiring process for a termination pattern on a logic circuit drawing by referring to a library file corresponding to the termination pattern virtual component when creating the logic circuit drawing having the termination pattern virtual component. And this And the net list creating unit for creating a net list having a description on termination pattern based on the logic circuit diagram created by the logic circuit drawing generation unit,
Parts list according to instructions from the logic circuit drawing creation unit
Virtual parts for termination pattern are considered as parts when creating
Parts list creation unit that performs the parts list creation processing without
PCB drawings for generating the print termination pattern on a printed board drawings using the library file corresponding to the virtual component termination pattern in the substrate library to create a printed board drawings created by the net list creation unit And a creating unit.

[0013]

According to the circuit diagram CAD system of the present invention, in a circuit diagram CAD system including a logic circuit drawing CAD system and a printed circuit board drawing CAD system, a logic library is converted into a virtual component for a termination pattern together with a library file corresponding to a general component. The printed circuit board library has a library file corresponding to a virtual component for a termination pattern together with a library file corresponding to a general component, and a logic circuit drawing creating unit has a corresponding logic file based on the logic library. At the time of creation, a placement and wiring process regarding the termination pattern on the logic circuit drawing is performed by referring to a library file corresponding to the termination pattern virtual component, and a logic circuit drawing having the termination pattern virtual component is created, and a netlist is created. The part is a logic circuit diagram Create a netlist having a description of a termination pattern based on the logic circuit diagram created by the creation unit, parts list creation unit creates a logic circuit diagram
When creating a parts list according to instructions from the
Create parts list without considering virtual parts for turns as parts
Performs processing, and when the printed circuit board drawing creating unit creates the printed circuit board drawing created by the netlist creating unit , the printed circuit board drawing uses the library file corresponding to the virtual component for the termination pattern in the printed circuit board library, and prints it on the printed circuit board drawing. Generate a termination pattern.

[0014]

Next, the present invention will be described in detail with reference to the drawings.

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

The circuit diagram CAD system according to the present embodiment includes a logic library creation unit 1, a logic library 2 having a termination pattern library file 20, a logic circuit drawing creation unit 3, a logic circuit drawing file 4, a netlist Creating section 5, netlist file 6, printed board library creating section 7, printed board library 8 having termination pattern library file 80, printed board drawing creating section 9, printed board drawing file 10
, Parts list creation unit 11, parts list file 12
It is comprised including. Here, a logic circuit drawing CAD system is constituted by the components indicated by reference numerals 1 to 6 and 11 and 12. Reference numeral 6
Printed circuit board drawing C by the components indicated by
An AD system is configured (the netlist file 6 is passed from the logic circuit drawing CAD system to the printed circuit board drawing CAD system).

FIG. 2 is a flowchart showing the processing of the logic circuit CAD system in the circuit diagram CAD system of the present embodiment. This processing is performed in the logic circuit drawing creation step 20
1, a logic circuit drawing save step 202, a net list file creation step 203, and a component list file creation step 204.

FIG. 3 is a flowchart showing the processing of the printed circuit board CAD system in the circuit diagram CAD system of the present embodiment. This processing includes a net list file reading step 301, a printed circuit board library reading step 302, and a printed circuit board drawing file creating step 303.

FIGS. 4A to 4C are diagrams for explaining a specific operation of the logic circuit CAD system in the circuit diagram CAD system of the present embodiment.

FIGS. 5A and 5B are diagrams for explaining a specific operation of the printed circuit board CAD system in the circuit diagram CAD system of the present embodiment.

Next, the operation of the circuit diagram CAD system of the present embodiment thus configured will be described.

First, the operation of the CAD system for drawing a logic circuit will be described.

The logic library creating section 1 creates the logic library 2 in advance prior to the creation of an actual logic circuit drawing and netlist. Conventionally, the logical library 2 has a library file having graphic information indicating a symbol shape and attribute information indicating attributes such as a component name and a pin number for each component (a file name is assigned to each library file). ) Is stored. In the present embodiment and the present invention, the logical library 2 includes a library file corresponding to a general component (for example, a resistor) and a library file corresponding to a virtual component for a termination pattern (the termination pattern library file 20). ) Is provided. This end pattern library file 20 is, for example, “END
_PATTERN "and has a file name of FIG.
It stores graphic information indicating the symbol shape as shown in FIG.

The logic circuit drawing CAD system performs the following processing on the assumption that the above-described logic library 2 exists (see FIG. 2).

The logic circuit drawing creator 3 reads a library file corresponding to each component from the logic library 2 based on an instruction of a logic circuit designer, and arranges each component on the logic circuit drawing based on the library file. And wiring between components. In this manner, the logic circuit drawing creation unit 3 creates a logic circuit drawing (step 20).
1).

At this time, the logic circuit drawing creator 3 refers to the termination pattern library file 20 and
A placement / wiring process is performed on the termination pattern (the termination pattern itself is “wiring”, not “parts”) on the logic circuit drawing. For example, to connect a termination pattern to the resistor R1, the termination pattern library file 2
The termination pattern virtual component E corresponding to 0 is arranged on the logic circuit drawing in the same manner as a normal component, and the termination pattern virtual component E is connected to the resistor R1 (see FIG. 4B).

The logic circuit drawing creator 3 executes step 201
Is completed, the processing result (logic circuit drawing) is saved in the logic circuit drawing file 4 (step 202).

Next, based on the instruction of the logic circuit designer, the netlist creation unit 5 creates the netlist file 6 with reference to the logic circuit drawing file 4 in which the logic circuit drawings have been saved in step 202 ( Step 203).
At this time, as shown in FIG. 4C, the netlist file 6 includes a description about the termination pattern. Incidentally, the description shown in FIG.
No. 2 pin and virtual component E for termination pattern
Is information indicating a termination pattern (a net having a name of R1_E (NET)) which is a wiring connected to the pin having the pin number 1 in FIG.

In addition, the parts list creation unit 11 creates the parts list file 12 based on the logic library 2 and the logic circuit drawing file 4 according to the instruction from the logic circuit drawing creation unit 3 (step 204). At this time, the component list creation unit 11 performs processing to create and output the component list file 12 without regarding the termination pattern virtual component indicated by the termination pattern library file 20 as a component. As a result, it is possible to prevent the information of the virtual component for the termination pattern, which is an unnecessary component, from being output to the component list file 12. It should be noted that the mode of processing for creating and outputting the component list file 12 without regarding the termination pattern virtual component as a component is not essential for the invention described in claim 1 (claims 1 and 2). See item 2).

Second, the operation of the printed circuit board drawing CAD system will be described.

In the printed circuit board CAD system, as in the case of the logic circuit drawing CAD system, the printed circuit board library creating unit 7 preliminarily performs the printed circuit board library 8 (on the printed circuit board drawing) (A library having graphic information indicating the shape of each component). In the present embodiment, and in the present invention, the printed circuit board library 8 includes, in addition to the library file corresponding to the general component, the terminal pattern library file corresponding to the terminal pattern library file 20 in the logical library 2. 80 (library file corresponding to the virtual component for the termination pattern in the printed circuit board drawing).

Here, the shape of the virtual component for the termination pattern indicated by the graphic information in the library file for termination pattern 80 is, for example, the pattern thickness (pattern width) of the printed board or the diameter sufficiently smaller than other components. (See FIG. 5 (a). The invention in which the virtual component for the termination pattern has such a shape on the printed circuit board drawing corresponds to the invention described in claim 3). This is to suppress the adverse effect due to the existence of the termination pattern virtual component, which is a component that does not originally exist. In the first and second aspects of the present invention, the shape of the virtual component for the termination pattern in the drawing of the printed circuit board is not limited to such a circle (claims 1 and 2 and 3 and 4). See contrast).

The printed circuit board drawing CAD system performs the following processing on the assumption that the printed circuit board library 8 exists as described above (see FIG. 3).

The printed board drawing creating section 9 reads the net list file 6 (the net list file 6 containing information on the virtual component for the termination pattern) created by the processing shown in FIG. 2 based on the instruction of the printed board designer. (Step 301), the printed circuit board library 8 including the termination pattern library file 80 is read (Step 302).

Further, the printed circuit board drawing creating section 9 includes a net list file 6 and a printed circuit board library 8.
Based on the above, a process of arranging and wiring components in the printed board drawing is performed to create a printed board drawing file 10 (step 303). At this time, the terminal pattern is generated on the printed circuit board drawing using the terminal pattern library file 80 as shown in FIG. Incidentally, in FIG. 5B, a termination pattern connected to the resistor R1 is generated.

[0036]

As described above, according to the present invention, a logic circuit drawing CAD system creates a netlist (netlist file) including a description of a termination pattern, and a printed circuit board CAD system reads such a netlist file. By automatically generating a termination pattern on a printed circuit board drawing, a termination pattern on a printed circuit board drawing in a circuit (distributed constant circuit) that actively uses a wireless area, such as a circuit for a microwave satellite communication device, is automatically generated ( Without the need for special instructions for processing regarding the termination pattern as in the past).
This has the effect of preventing the occurrence of "instruction error by logic circuit designer" and "design error by printed circuit board designer".

Here, when adopting the present invention that provides the above-described effects, the component list creating unit creates the component list file without considering the terminal pattern virtual components as components, thereby achieving the above-described effects. In addition, it is possible to prevent the description of the virtual component for the termination pattern, which is an unnecessary component, from being output to the component list file (the unnecessary information can be prevented from being output to the component list file). ).

Further, by comparing the shape of the virtual component for the terminal pattern in the printed circuit board drawing with a sufficiently small circle as compared with the pattern thickness (and therefore compared with other general components), Adverse effects caused by introducing the concept of virtual components (adverse effects due to the presence of virtual components for termination patterns that are components that do not exist originally)
Has the effect of being able to keep down.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing processing of a CAD system for a logic circuit drawing in FIG. 1;

FIG. 3 is a flowchart showing a process of the printed circuit board CAD system in FIG. 1;

FIG. 4 is a diagram illustrating a specific operation of the CAD system of the logic circuit drawing in FIG. 1;

FIG. 5 is a diagram for explaining a specific operation of the printed circuit board drawing CAD system in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Logic library creation part 2 Logic library 3 Logic circuit drawing creation part 4 Logic circuit drawing file 5 Netlist creation part 6 Netlist file 7 Printed circuit board library creation part 8 Printed circuit board library 9 Printed circuit board drawing creation part 10 Printed circuit board drawing file 11 Parts list creator 12 Parts list file 20 Termination pattern library file 80 Termination pattern library file

Claims (2)

(57) [Claims] 1. A circuit diagram CAD system comprising a logic circuit drawing CAD system and a printed circuit board drawing CAD system, comprising: a logic library having a library file corresponding to a general component and a library file corresponding to a virtual component for a termination pattern; A printed circuit board library having a library file corresponding to a termination pattern virtual component together with a library file corresponding to a general component, and a library corresponding to the termination pattern virtual component when creating a logic circuit drawing based on the logic library A logic circuit drawing creator that performs a placement / wiring process on a termination pattern on the logic circuit drawing by referring to a file to create a logic circuit drawing having virtual components for the termination pattern; and a logic created by the logic circuit drawing creator. circuit And the net list creating unit for creating a net list having a description on termination pattern based on the surface, parts list according to an instruction from the logic circuit drawing generation unit
Virtual parts for termination pattern are considered as parts when creating
Use and parts list creation unit that performs processing of creating a parts list, a library file corresponding to the virtual component termination pattern in the printed circuit board library to create a printed board drawings created by the net list generator without And a printed circuit board drawing creating unit for generating a termination pattern on the printed circuit board drawing. 2. The graphic information of a virtual component for a terminal pattern in a library file corresponding to a virtual component for a terminal pattern in a printed circuit board library is a circle that is sufficiently smaller than a pattern thickness. 1. The circuit diagram CAD system according to 1.