JPH07182401A - Designing support device for printed circuit board - Google Patents

Abstract

PURPOSE:To verify the designing of a printed circuit board in a simple way and in a short time by synthesizing the unchanged and changed net lists of a connection diagram, rearranging data for each net name, and then converting those data having the same net end parts pin names into a single piece of data. CONSTITUTION:A net list producing means 10 of a CPU 1 produces a net list showing the correspondence between the parts pin and net names based on the connection diagram of an input printed circuit board. A connection diagram producing means 9 produces a connection diagram from the net list. Then a net list synthesizing means 11 of the means 10 synthesizes the unchanged and changed net lists by adding the indexes to these lists to show the unchanged end changed states respectively when the designed connection diagram is partly changed. A rearranging means 12 rearranges data for each net name. A data converting means 13 converts those data that have the same net and parts pin names into a single piece of data. Then an editing means 14 edits the converted data in response to the unchanged net list.

Description

Detailed Description of the Invention

[0001]

The present invention is used in the design of printed wiring circuit boards. The present invention relates to improvement of CAD (Computer Aided Design Apparatus). BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for appropriately responding to and verifying a change in a part of a printed wiring circuit board that has already been designed.

[0002]

2. Description of the Related Art Conventionally, when a circuit pattern is partially changed in a CAD design of a printed wiring board, the circuit diagram which is the basis of the change is corrected. However, if the circuit diagram is handwritten or created by CAD, the 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. , The old and new comparison list of the net before and after the change was output, and the design change was verified by collating this list with the circuit diagram.

Conventionally, in a CAD design, when a circuit change as shown in FIG. 9 occurs, the new and old nets are combined, the unchanged data is converted, and a comparison list is output as shown in FIG. 10 after the change. 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. 3 (a) and 3 (b) are simply combined with the same component pin names as shown in FIG. 11, and the data of the same net name before and after the change are deleted. Then, the old-old contrast list shown in FIG. 12 is created, and the old-old contrast list is used to collate with the circuit diagram.

With respect to a connection diagram (circuit diagram) given in the past, there is a technique for 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 this netlist. Known (JP-A-2
-287977, JP-A-60-59472).

[0006]

When verifying a design change by such a conventional procedure, the circuit diagram and the comparison list are collated for each component pin. , Often the net name is not filled in,
Therefore, when checking one component pin whose net is changed, it is necessary to check other component pins connected to the same net, and it is necessary to check the whole netlist in addition to the old / new comparison list. As shown in FIG. 10, it is necessary to output a netlist, and if a person does not judge the output data, the user cannot proceed.

As described above, the conventional apparatus requires a plurality of lists, which complicates the check method, and therefore requires a lot of time for the work and the reliability is not improved.

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

[0009]

The first aspect of the present invention is to provide a means for creating a netlist in which a component pin name and a net name are associated with each other from an input connection diagram of a printed circuit board, and a connection diagram from this netlist. In a printed circuit board design support device including a central processing unit having a means for creating and a storage device holding the netlist, the means for creating the netlist is a part of a connection diagram already designed. When is changed, a means for synthesizing the netlist before the change and the netlist after the change with indexes indicating the before and after the change, respectively, and means for rearranging the data for each net name, And a means for converting data having the same net name and component pin name into one data.

It is preferable that the means for creating the netlist includes means for editing the one data converted by the means for converting the one data so as to correspond to 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 a component pin name and a net name are associated with each other from a given connection diagram, and a part of the already designed connection diagram is When changed, a netlist before the change and a netlist after the change are combined with an index showing the before and after the change, respectively, and a step of rearranging the data for each net name,
A step of converting data having the same net name and a component pin name into one piece of data, and a step of editing the one piece of data converted by the means for converting into one piece of data in association with the net list before change It is characterized by including.

[0012]

[Function] A netlist before change and a netlist after change are combined with indexes showing before and after change respectively, and the data is rearranged according to the net name. Convert it to one data,
Edit the data with the same net name.

As a result, the old and new comparison list data can be created by combining the old and new indexes of the net name and the name of the component pin connected to it. Therefore, all the component pins related to the changed net are output as a list. You can Further, since the added and deleted changes can be known, the circuit diagram and the changed part can be collated easily in a short time with high reliability.

[0014]

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

According to the embodiment of the present invention, a netlist creating means 10 for creating a netlist in which a component pin name and a net name are associated with each other from an input connection diagram of a printed circuit board, and a connection for creating a connection diagram from this netlist. A central processing unit 1 having a diagram creating means 9, a storage unit 3 for holding this netlist, an input unit 2 for inputting various data necessary for design and operation input, a design pattern and design data are displayed. 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 the already-designed connection diagram is changed by the netlist creating means 10. To
A netlist synthesizing means 11 for synthesizing the netlist before the change and the netlist after the change with indexes indicating before and after the change respectively, and a rearranging means 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 association with the net list before the change. Including and

In designing a printed circuit board using this device, a netlist in which component pin names and net names are associated with each other is created from a given connection diagram, and part of the already designed connection diagram is modified. In this case, the netlist before change and the netlist after change are combined with the indexes showing before and after change, respectively, and the data is sorted by net name so that the net name and component pin name are the same. Is converted into one data, and the data conversion means 13
It is performed by editing one piece of data converted by the method so as to correspond to the net list before the change.

The verification operation of the apparatus of the present invention will be described below with reference to the drawings. FIG. 2 is a flow chart showing the flow of the verification operation by the apparatus 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 after the change and the new net list 16 after the change are combined with new and old indexes (+ indicates an added net and − indicates a deleted net) indicating the before and after the change, respectively, and the data shown in FIG. 4 is created. Next, the data shown in FIG. 5 is created by rearranging the data according to the net name 18 in the order of character code numbers, and the data having the same net name 18 and component pin name 17 is converted into one data to obtain the old and new indexes. When all the data belonging to a certain net disappears, all the data belonging to that 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 a net name, a component pin name connected to the net name, and an old index as shown in FIG. . By outputting the created list data by the printing device 5, it is possible to collate with the circuit diagram.

Since the old and new 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 process of the same net shown in FIG. When comparing the old and new 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, old and new comparison list data can be created by combining old and new indices of a net name and a component pin name connected to it. You can output all the pins as a list. Further, since the added and deleted changes can be known, there is an effect that the circuit diagram and the changed part can be collated easily in a short time with high reliability.

[Brief description of drawings]

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

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

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

FIG. 4 is a diagram showing an example of data obtained by combining a net list before and after a change by a device according to an embodiment of the present invention.

FIG. 5 is a diagram showing an example in which data is rearranged according to net names by the device of 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 an old-new contrast list edited for each group of the same net by the device of the present invention.

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

FIG. 9 is a diagram showing an example of a change target circuit diagram in the embodiment of the present invention and the conventional example.

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

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

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

[Explanation of symbols]

 1 Central Processing Unit 2 Input Device 3 Storage Device 4 Display Device 5 Printing Device 9 Connection Diagram Creating Means 10 Netlist Creating Means 11 Netlist Composing Means 12 Rearranging Means 13 Data Converting Means 14 Editing Means 15 Old Netlists 16 New Netlists 17 Component pin name 18 Net name

Claims (3)

[Claims] 1. A central processing unit comprising means for creating a netlist in which component pin names and net names are associated with each other from a connection diagram of an input printed circuit board, and means for creating a connection diagram from this netlist. In a printed circuit board design support device provided with a storage device that holds this netlist, the means for creating the netlist includes a net before the change when a part of the already designed connection diagram is changed. A means for synthesizing the list and the changed netlist with indexes indicating before and after the change, a means for rearranging the data by net name, and a data for which the net name and the component pin name are the same And a means for converting the data into one data, a printed circuit board design support device. 2. The printing according to claim 1, wherein the means for creating the netlist includes means for editing the one data converted by the means for converting the one data in correspondence with the netlist before the change. Circuit board design support device. 3. A method of designing a printed circuit board for creating a netlist in which a component pin name and a net name are associated with each other from a given connection diagram, when a part of the already designed connection diagram is changed. The netlist before change and the netlist after change are combined with indexes showing the before and after changes respectively, the step of rearranging the data by net name, and the net name and component pin name A step of converting the same data into one piece of data, and a step of editing the one piece of data converted by the means for converting the one piece of data so as to correspond to the netlist before the change. Printed circuit board design method.