JP2705548B2 - Printed circuit board design support equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for designing a printed circuit board. The present invention relates to an improvement in a CAD (Computer Aided Design Device). The present invention relates to an apparatus for appropriately responding to a change when a part of an already designed printed circuit board is changed and performing verification.

[0002]

2. Description of the Related Art Conventionally, when a partial change of a circuit pattern occurs in a CAD design of a printed wiring board, a circuit diagram on which the change has been made has been modified. However, if the circuit diagram is handwritten or created by CAD, data may not be supplied only by the circuit diagram due to the circumstances of the change. In such a case, the pattern is changed by the CAD device. Then, a new and old comparison list of the net before and after the change is output, and this list is compared with the circuit diagram to verify the design change.

Conventionally, in a CAD design, when a circuit change as shown in FIG. 9 occurs, after the change, as shown in FIG. 10, the new and old nets are synthesized, the data without change is converted, and a comparison list is output. The old and new comparison list was created by the procedure of collating with the circuit diagram.

That is, the netlists before and after the change shown in FIGS. 3A and 3B are simply combined with the same component pin names as shown in FIG. 11, and data with the same net name before and after the change is deleted as shown in FIG. Then, a new / old comparison list shown in FIG. 12 was created, and the new / old comparison list was used to collate with the circuit diagram.

[0005] With respect to a connection diagram (circuit diagram) given conventionally, a technique of creating a netlist in which component pin names and net names are associated with each other, processing the design, and creating a connection diagram from the netlist is known. Known (Japanese Unexamined Patent Publication No.
-287768, JP-A-60-59472).

[0006]

When verifying a design change by such a conventional procedure, the circuit diagram is compared with the comparison list for each component pin. , Often not even the net name,
Therefore, when checking one component pin in which a net is changed, it is necessary to check other component pins connected to the same net, and it is necessary to check the entire net list in addition to the new and old comparison lists. As shown in FIG. 10, it is necessary to output a netlist, and if the output data is not viewed by a person and judgment is made, the process cannot proceed.

As described above, the collation performed by the conventional apparatus requires a plurality of lists, which complicates the checking method, and thus requires a lot of time for the operation and does not improve the reliability.

The present invention solves such a problem, and performs design verification by comparing the result of a design change of a printed wiring board with a circuit diagram in a simple and short time with high reliability. It is an object of the present invention to provide a device capable of performing the above.

[0009]

Means for Solving the Problems The first aspect of the present invention is a means for creating a netlist in which component pin names and net names are made to correspond from an input connection diagram of a printed circuit board, and a connection diagram from the netlist. In a printed circuit board design assisting apparatus including a central processing unit having a unit for creating and a storage device for holding the netlist, the unit for creating the netlist is a part of an already designed connection diagram. Means for synthesizing the netlist before change and the netlist after change with an index indicating before and after change, and means for rearranging data for each net name, look including a means for converting the data of the same net names and component pin name in one data, the net name and connecting to each net component pin
Data before and after the change.
It is characterized in that it comprises means for outputting in a lump .

It is preferable that the means for creating the netlist includes means for editing one data converted by the one data conversion means in correspondence with the netlist before the change.

A second aspect of the present invention is a method of designing a printed circuit board for creating a net list in which component pin names and net names are made to correspond from a given connection diagram. Synthesizing the netlist before the change and the netlist after the change with an index indicating the before and after the change when the change is made; and rearranging the data for each net name;
A step of converting data having the same net name and component pin name into one data, and a step of editing the one data converted by the means for converting to the one data in association with the net list before change; , Edited
Outputs data before and after change collectively for each slot.
And a step .

[0012]

[Function] The pre-change netlist and the post-change netlist are combined with indexes indicating the before and after changes, respectively, and the data is rearranged by the net name. Convert to one data,
Edit the data with the same net name.

[0013] This makes it possible to create new and old comparison list data based on a combination of the new and old indices of the net name and the component pin names connected to the net name, so that all the component pins related to the changed net can be output as a list. Can be. Further, since a change form of addition or deletion can be known, the comparison between the circuit diagram and the changed portion can be easily performed in a short time with high reliability.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

In the embodiment of the present invention, a netlist creating means 10 for creating a netlist in which component pin names and net names are made to correspond from the input connection diagram of the printed circuit board and a connection for creating a connection diagram from the netlist A central processing unit 1 having a diagram creating means 9; a storage device 3 for holding the net list; an input device 2 for inputting various data necessary for design and operation input; and displaying design patterns and design data. A display device 4 and a printing device 5 for printing out design drawings and design materials are provided. Further, as a feature of the present invention, when a part of an already designed connection diagram is changed To
A netlist synthesizing unit 11 for synthesizing the netlist before the change and the netlist after the change with an index indicating the before and after the change, respectively; a rearranging unit 12 for rearranging the data for each net name; Data conversion means 13 for converting data having the same net name and component pin name into one data, and editing means 14 for editing one data converted by the data conversion means 13 in correspondence with the net list before the change. And

In the design of a printed circuit board using the present apparatus, a netlist is created by associating component pin names and net names from a given connection diagram, and a part of the already designed connection diagram is changed. And the netlist before change and the netlist after change are combined with an index indicating the before and after change, respectively, and the data is sorted by net name, and the net name and component pin name are the same. Is converted into one piece of data, and the data
Is performed by editing one data converted by the above in association with the netlist before the change.

Hereinafter, a verification operation performed by the apparatus according to the embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a flowchart showing the flow of the verification operation by the apparatus according to the embodiment of the present invention.

First, FIG. 3 stored in the storage device
Old netlist 15 before change shown in (a) and (b)
The new net list 16 and the new net list 16 after the change are combined with new and old indices (+ indicates an added net and − indicates a deleted net) indicating the before and after the change, respectively, to create data shown in FIG. Next, the data shown in FIG. 5 is created by rearranging the data by the net name 18 in the order of the character code numbers, and the data in which the net name 18 and the component pin name 17 are the same is converted into one data to obtain the new and old indexes. Is deleted, and when the index of all data belonging to a certain net is lost, all the data belonging to the net are deleted and the data shown in FIG. 6 is created.

Subsequently, the data of the same net name is put together to create new / old comparison list data composed of a set of combinations of the net name, the component pin name connected to the net name, and the new / old index shown in FIG. . The created list data is output by the printing device 5 so that it can be collated with the circuit diagram.

Since the new and old comparison list can be created as shown in FIG. 8, in this case, the component pin names are separated for each index by the data editing processing of the same net shown in FIG. When comparing the new and old comparison list with the circuit diagram, the added pin and the deleted pin can be clearly separated and inspected.

[0021]

As described above, according to the present invention, new and old comparison list data can be created by combining new and old indices of net names and component pin names connected to the net names. All pins can be output together as a list. Further, since it is possible to know the changed form of addition or deletion, there is an effect that the comparison between the circuit diagram and the changed portion can be easily performed in a short time with high reliability.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of a verification operation by the apparatus according to the embodiment of the present invention;

FIG. 3A is a diagram illustrating an example of an old netlist in the embodiment of the present invention, and FIG. 3B is a diagram illustrating an example of a new netlist.

FIG. 4 is a diagram showing an example of data synthesized before and after a netlist is changed by the apparatus according to the embodiment of the present invention.

FIG. 5 is a diagram showing an example in which data is rearranged by net name by the apparatus according to the embodiment of the present invention.

FIG. 6 is a diagram showing an example in which unchanged data is converted by the apparatus according to the embodiment of the present invention.

FIG. 7 is a diagram showing an example of a new / old comparison list edited for each group of the same net by the apparatus according to the embodiment of the present invention.

FIG. 8 is a diagram illustrating an example of a new / old comparison list created by separating component pin names for each index by the apparatus according to the embodiment of the present invention.

FIG. 9 is a diagram showing an example of a circuit diagram to be changed in the embodiment of the present invention and the conventional example.

FIG. 10 is a flowchart showing a flow of a verification operation by the conventional apparatus.

FIG. 11 is a diagram showing an example of a new and old netlist synthesized by a conventional device.

FIG. 12 is a diagram showing an example of a new / old comparison list output by a conventional device.

[Description of Signs] 1 Central processing unit 2 Input device 3 Storage device 4 Display device 5 Printing device 9 Connection diagram creation means 10 Netlist creation means 11 Netlist synthesis means 12 Rearrangement means 13 Data conversion means 14 Editing means 15 Old net List 16 New netlist 17 Component pin name 18 Net name

Claims (3)

(57) [Claims] 1. A central processing unit comprising: means for creating a netlist in which component pin names and net names are made to correspond from an input connection diagram of a printed circuit board; and means for creating a connection diagram from the netlist; In a printed circuit board design support device comprising a storage device for holding the netlist, the means for creating the netlist is, when a part of the already designed connection diagram is changed, the net before the change. Means for synthesizing the list and the changed netlist with indicators indicating before and after changes, means for rearranging data for each net name, and data having the same net name and component pin name only it contains the means for converting one of the data, sequence component pin name to connect to the net name and for each net
Summarizes the data of the component pin names before and after the change.
A printed circuit board design support device comprising output means . 2. The printing apparatus according to claim 1, wherein the means for creating the netlist includes means for editing one data converted by the one data conversion means in correspondence with the netlist before the change. Circuit board design support equipment. 3. A method of designing a printed circuit board for creating a netlist in which component pin names and net names are made to correspond from a given connection diagram, wherein a part of an already designed connection diagram is changed. Synthesizing the netlist before the change and the netlist after the change with an index indicating before and after the change, rearranging the data for each net name, and Converting the same data into one data, editing one data converted by the one data conversion means in correspondence with the net list before the change, and changing each of the edited nets Combine the data before and after the change
And outputting the printed circuit board.