JP3017849B2 - CAD design method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to efficient management of various library data used in CAD design of electronic circuits and the like.

[0002]

2. Description of the Related Art In a library used in this kind of CAD design, respective library data are constructed in a format of logical data, mounting data or the like in a database structure using a component name as a search key.

A CAD design procedure in such a conventional technique will be described with reference to FIG. In the CAD design, the logic design processing and the packaging design processing of the circuit are mainly performed. The CAD design library data is provided with a library table 8 created in advance. Logic data such as pin names and logical attributes, and mounting data such as component shapes, physical pin names, and power / ground data are stored.

At the stage of the logic design process 10, the logic data is provided, and at the stage of the package design process 11, the implementation data is provided,
Each process and data were provided in a one-to-one relationship. As described above, the library table in the prior art employs a method of creating all necessary library data in advance, and this data creation is performed by first setting part names by conversation processing or the like, and then creating logical data. And input the implementation data each time.

As described above, when designing CAD,
By referring to the component name of the library data as a label, the contents of the subordinate logic data and the mounting data are extracted and taken into the CAD design data.

[0006]

In the above-mentioned prior art, the library data once created is incorporated into the CAD design data in the created format, so that, for example, even if the logic is the same and the part shape is the same, When parts having different functions such as a voltage value and a current value are used, the library data must be recreated each time.

As a result, the number of library data re-creation and management steps increases, and the data to be stored increases.
This has been an obstacle to efficient CAD design. The present invention has been made in view of the above problems, and its object is to provide a CA
An object of the present invention is to provide an efficient data management method in a D design library.

[0008]

According to the present invention, as shown in FIG. 1 which is a principle diagram, a library table 8 is composed of an index table 1, a logical data table 2, a mounting data table 3, a function data table 4, In the logical design processing 10 and the implementation design processing 11, editing processing is performed as necessary to create a new library.

[0009]

According to the present invention, logical data and mounting data are separately created for each component by dividing and managing each data table as described above, and common data is shared between components. By doing so, the management of the library can be made extremely efficient.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a CAD design system according to the present embodiment, as shown in FIG. 2, an interface processing unit 12, which is a core of a CAD design process, interface data 13 registered on a magnetic disk or the like, and first CAD design library data. 6. The processing shown in the figure can be realized by a computer system having a central processing unit and a storage device, and each processing of the interface processing unit 12 can be realized by the central processing unit.
Also, the interface data 13, the first CAD design library data 14, the basic library table 8,
The CAD design library table 7 can be provided in a storage device. The storage device may use a general storage medium such as a magnetic disk device and a magneto-optical disk device.

The first CAD design library data 6 has a basic library table 8 in which logical data and mounting data are registered for each component. This first CAD
The design library data 6 has been generated in advance by a library creation instruction 15 from the outside.

Here, the logical data is a logical symbol (AND, OR gate, etc.), a logical pin name (IN, OUT, I / O, etc.), a logical attribute, etc. as shown in FIG.
Also, the mounting data refers to the component shape (DI
P, LCC, etc.), a physical pin name (the first pin, etc.), power supply / earth data, and the like.

A component correspondence table 16 is set in the interface data 13, and a component name serving as a label of the second CAD design library data 7 is registered in the component correspondence table 16.

In the interface processing unit 12, the second C
As shown in FIG. 2, an index table 1 for registering a component name as a label and a logical data (for each label) belonging to a lower level of the index table 1 are stored therein. Logical data table 2 for registering information) and mounting data (information)
And a function data table 4 for registering function data (information).

In this embodiment, a common table 5 for registering a key for referring to each data table in parallel with each data table is added. This common table is referred to by a key for each component name in the index table 1.

That is, in the CAD design process, the same logical symbol (for example, AN
D) or another component having the same mounting shape is often used in large quantities, but each time a new component is added or a component is changed due to a change in function data, the conventional technology (FIG. 6) is used. Library table 8 in which the logical data and the mounting data are individually registered for each of the components described in (2).
Creating is difficult.

In this regard, in this embodiment, as described above, the table is divided into the logical data table 2, the mounting data table 3, and the function data table 4, and these are integrated and managed by the upper index table 1. Keep it.
By adding a common table 5 in addition to the above-described tables, it is sufficient to register only the logical data table 2 and the mounting data table 3 that have differences between components.

For example, in the logical data table 2, the C
Only the number of logics used in the AD design need be registered, and only the type of the mounting package structure needs to be registered in the mounting data table 3.

With respect to keys for referring to these keys, a large number of different components can be stored in a small area only by registering them in the common table 5 for each component name. For example, when a new part, for example, “part name AC” is newly registered according to an instruction from the outside, if the logic and mounting form are the same as “part name AB”, and only the function data is different, an external input , Only the function data needs to be registered in the function data table 4,
The logical data and the mounting data need only be stored in the common table 5 using the same address as the address on the logical and mounting table corresponding to the “part name AB” as a key. As a result, in the newly registered “part name AC”, the information area of the logical data and the mounting data can be saved.

Next, referring to FIG. 5, the CA in this embodiment will be described.
The flow of the D process will be described. In the CAD design process, the logic design process 10 is executed, and the interface processing unit 1
When there is a request for a required library for the second CAD interface library 2, the interface processing unit 12 reads the required component name from the interface data 13 and registers it in the index table 1 of the second CAD design library data 7. 1, a common table 5, a logical data table 2, and an implementation data table 3
Then, the information from the first CAD design library data 6 is registered. In the function data table 4, information on the function determined in the logical design processing 10 is registered.

At this time, each data table is registered in correspondence with the label of the index table 1. As described above, the logic, mounting,
If the data is the same as the function data, the key is registered in the common table 5 and the registration in the individual data table is omitted.

The second CAD design library data 7 constructed in this manner provides logical data at the stage of the logical design process 10 of the CAD design and mounting data at the stage of the package design process 11.

[0023]

According to the present invention, efficient library management can be realized by dividing and registering logical data, mounting data, and the like into individual tables as library tables.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a block diagram showing a table structure of a library in the embodiment.

FIG. 3 is an explanatory diagram showing a specific example of logical data according to the embodiment;

FIG. 4 is an explanatory diagram showing a specific example of mounting data in the embodiment.

FIG. 5 is an explanatory diagram showing a flow of a CAD design process in the embodiment;

FIG. 6 is an explanatory diagram showing the structure of a library table and the relationship between library data and CAD design processing in the related art.

[Explanation of symbols]

1. Index table 2. Logical data table 3. Implementation data table 4. Function data table 5. Common table 6. First library table (first CAD design library table) 7. Second library Table (second CAD design library table) 8. Library table 10. Logic design processing 11. Implementation design processing 12. Interface processing unit 13. Interface data 15. Library creation instruction 16. Parts correspondence table

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Claims (3)

(57) [Claims] 1. A CAD design method for arranging component data registered in a library set in a storage device in accordance with a logic design processing step executed by a central processing unit and a mounting design processing step. Registering the component name as a label in the index table, and accessing the logical data table in which logical information is registered for each label by referring to the index table provided below the index table; Accessing the mounting data table in which mounting information is registered for each of the labels by referring to the index table provided below the index table; and referring to the index table provided below the index table. , Each label Information and a step of accessing the function data table registered, the central processing unit, CAD design method characterized by creating a library by performing the steps selectively. 2. A CAD design apparatus for arranging component data registered in a library set in a storage device in accordance with a logic design processing step executed by a central processing unit and a mounting design processing step. An index table for registering part names as labels in a logical data table provided below the index table and accessed by the central processing unit via an index tail, and logical information is registered for each label; Similarly, a mounting data table accessed through the index table and registered with the mounting information for each label, and a function data table similarly accessed via the index table and registered with the function information for each label Wherein the central processing unit has a logic design process. In step or the mounting design process steps, logic data the data table through the index table, CAD design system, characterized in that access to the mounting data table or function data table to create a library. 3. The system according to claim 2, further comprising a common table below the index table for registering, as a key, reference addresses of the logical data table, the mounting data table, and the function data table for each of the labels. CAD design apparatus according to the above.