JPH05143682A - Cad system - Google Patents

Abstract

PURPOSE:To provide a CAD system in which a target to be automatically wired can be automatically switched from a component pin to a component vir and the amount of data can be suppressed from being remarkably increased. CONSTITUTION:When it is desired to perform automatic wiring by a prescribed component bier communicated with the component pin, not by the component pin, automatic relocation processing parts 18. 19 designate the component vir as an automatic wiring target instead of the component pin by instructing corresponding component pin and component to a target instruction part 17. Furthermore, when a library hierarchization part 16 is provided for those processing, the automatic relocation processing part 19 manages component pin information, component vir information, and draw-out pattern information to be registered on a CAD library 15 comprehensively as component virtual pin information, and expresses the component pin information as a set of component virtual pin information, and stores it in the library hierarchization part 16, which reduces the amount of data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD system for automatically designing wiring for a board by registering physical parts and their pins, which are converted into data for a computer, corresponding to actual parts.

[0002]

2. Description of the Related Art The operation of a conventional example of a CAD system of this type will be described with reference to the flowchart of FIG. The physical part information is registered (step S31), and the part pin information is registered (step S32). It is judged whether or not the drawer pattern is to be registered (step S33), and if it is to be registered, the drawer pattern information is registered (step S).
34). Next, the component via information is registered (step S3
5) If necessary, the target of the automatic wiring is manually replaced from the component pin to the component via on the CAD library (step S36).

Next, a case will be described in which a board wiring is attempted to be performed as shown in FIG. 17 using such a CAD system.

High density package of LSI (especially ASIC
(Fig. 1), the pad shape of the component pins mounted on the printed circuit board has become finer, and as shown in the figure, the actual parts used by the CAD system of the printed circuit board for design ( The pin pad for the component mounted on the printed board) and the designed component pin pad (hereinafter referred to as component via) for actually connecting the wiring pattern are different pads.

On the other hand, when using a CAD system for a printed circuit board, the user needs to register the parts to be used in the parts library of the CAD system.
Unlike conventional parts, it is necessary to create an extraction pattern up to the designing component via pad every time at the layout designing time, if only the actual component is registered for the above component. Moreover, such a component has many component pins (50 to 300 pins).

[0006]

SUMMARY OF THE INVENTION Conventional CAD described above
The system is created with such a wiring pattern (hereinafter referred to as a drawing pattern) at the time of component registration, and at the same time, it has the same pin name as the target pin (the pin that automatic wiring recognizes as a connection destination: usually described as a pin number in the netlist). It is necessary to register as many parts as possible that have component vias that have parts vias, and it takes time and effort to set the part vias and lead patterns at the time of part registration. There is a need for types. For this reason, the conventional CAD system has the following problems.

(1) In a CAD system that does not assume the component vias as described above, it is complicated to manually replace the component vias with the component pins. That is, when trying to create a component library with a drawing pattern, the original component pins are not clear, so it is possible if there is a method in which the user specifies all component pins in the library. An interface where the user specifies thousands of pins is not practical.

(2) There is a problem that the number of registered parts data on the CAD library increases. Originally, the component via at the tip of the extraction pattern depends on the shape of the extraction pattern, and therefore has the property that it can be registered at the same time as the extraction pattern. However, in the conventional library, the extraction pattern and the component via are registered as separate items. In addition, it is necessary to register the original parts, the lead patterns, and the vias one by one for each part (the lead patterns and the vias are related only to the part shape, and therefore are related to the difference in the logical form). (Although it is much less than the variation of parts information).

In view of the above problems, the present invention can automatically change the target to be automatically wired from the component pin to the component via, and the data amount for that purpose does not increase so much.
The purpose is to provide an AD system.

[0010]

A CAD system according to the present invention includes a physical part information registration unit for registering physical part information about a physical part and a part pin for registering part pin information about a pin of a physical article in a CAD library. A CAD system comprising an information registration unit and a drawer pattern information registration unit for registering a drawer pattern when there is a drawer pattern associated with a physical part, and performing automatic wiring with a pin of a physical article as a target, A target designating unit that designates the target pin and a component via that is desired to be a target instead of the target pin, and a component auto designated by the target designating unit that serves as a target for automatic wiring instead of the pin. And a processing unit. Alternatively, the target pin and the target designating unit that designates the component via desired to be the target instead of the target pin, the component pin information, the component via information, and the extraction pattern information registered in the CAD library are the component virtual pin information. The component pin information is collectively managed as a library layering unit that represents a set of these component virtual via information, and a replacement automatic processing unit that targets the component vias designated by the target designating unit in place of the pins for automatic wiring. Have.

[0011]

[Function] When it is desired to perform the automatic wiring not to the pin but to the predetermined component via communicating with the pin, when the target designating unit designates the corresponding pin and the component via, the automatic reassignment processing unit selects the component via. Specify automatic wiring target instead of pin. Further, regarding the above processing, when the library hierarchizing unit is provided, the library hierarchizing unit collectively manages the component pin information, the component via information, and the drawing pattern information registered in the CAD library as the component virtual pin information. , Component pin information is represented by a set of these component virtual pin information, and the amount of data is reduced.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a CAD system of the present invention. In this embodiment, the physical component information registration unit 11, the component pin information registration unit 12, the extraction pattern information registration unit 13, the component via information registration unit 14, the library 15, the hierarchical library 16, the graphics terminal 17, the automatic transfer processing. It is composed of parts 18 and 19 and a CPU 20.

The physical part information registration unit 11 is a library 1
A physical part name, a physical part shape, and a physical part attribute are registered in 6 for all parts. Parts pin information registration unit 12
Registers component pin names, component pin coordinates / shapes, and component pin attributes for all pins. The extraction pattern information registration unit 13 registers the extraction pattern coordinates / shape for each pin. The component via information registration unit 14 registers the component via name, the component via coordinates / shape, and the component via attribute for all vias.

The library 15 includes a physical part information registration unit 1
1, the component pin information registration unit 12, the extraction pattern information registration unit 13, and the component via information registration unit 14 hold the respective contents before registration, and also hold the processing result of the replacement automatic processing unit 18. The state held in the library 15, that is, the library structure, is as shown in FIG. Also,
The hierarchical library 16 holds the processing result of the automatic reassignment processing unit 19. The state held in the hierarchical library 16, that is, the hierarchical library structure is as shown in FIG.

The graphics terminal 17 displays the designed wiring and the automatic reassignment processing unit 1
The instruction regarding the target via transmitted to 8 and 19 is accepted. When the self-selection processing unit 18 selects itself, based on an instruction given via the graphics terminal 17, the target for automatic wiring is replaced from a pin to a component via, and the result is stored in the library 15.

If the self-selection processing unit 19 selects itself, the target for automatic wiring is switched from the pin to the component via based on the instruction given via the graphics terminal 17, and the result is hierarchized in the library 16. To store. This is because the information about the pins is already stored in the hierarchical library 16 as the component virtual pin information. The CPU 20 includes the above-mentioned respective units 11, 12, 19
Control, and follow the instructions on whether to layer the data,
The board wiring design stored in the library 15 or the hierarchical library 16 is converted to the graphics terminal 17
, And replace the pin and the component via as the target of automatic wiring.

Next, the operation of this embodiment will be described with reference to FIG. Steps S1, S2, S3, S4 and S5 are steps S31, S32, S33 and S3 of the conventional example shown in the figure.
4 and S35, respectively. After step S5, when a component pin and a component via are instructed to change the target of automatic wiring via the graphics terminal 17, the instruction is accepted (step S6). After receiving the instruction, it is inquired whether or not the library is hierarchized (step S7). When not hierarchized, the target is changed from the component pin instructed in step S6 to the component via (step S8) and stored in the library 15 (step S9). When hierarchizing in step S7, the target is changed from the component pin in the hierarchical component virtual pin information to the component via (step S10),
It is stored in the hierarchical library 16 (step S11).
When the drawing pattern is not registered in step S3, the conventional process is performed (step S12).

Among the operations of this embodiment described above, the points different from the prior art will be described in more detail. First, a case will be described where design-related data is stored in the library 15 without being hierarchized. FIG. 5 is a diagram showing a library structure stored in the library 15 and relating to a physical component (here, only component A is represented) before the target of automatic wiring is changed from the component pin to the component via, and FIG. FIG. 6 is a diagram showing a physical part and a drawing pattern which are shown in the library structure of FIG. 5 and displayed on the graphics terminal. FIG. 7 is a diagram showing the library structure after the automatic wiring targets of the physical parts shown in FIG. 3 have been changed, and FIG. 8 is the library structure shown in FIG. 7 displayed on the graphics terminal. It is a figure which shows a physical component and a drawing pattern.

As shown in FIG. 5, the physical part information registration unit 11 makes a part name: A, a part shape: a rectangle, (-10, -2).
Register component information such as 0) and (40, 40). Next, by the component pin information registration unit 12, for each component pin, for example, component pin 1, pin name 1, pin coordinate (0, 0), shape
Register ~. Next, the drawer pattern information registration unit 13
A case of registering a drawing pattern will be described. (If you do not register the withdrawal pattern here,
The present processing is not related to the present invention). The library 1 stores attributes such as end point coordinates and pattern width of each segment of the drawing pattern in the drawing pattern information registration unit 13.
Register to 5. Next, the component via information registration unit 14 causes via coordinates (-10, -2) associated with the extraction pattern.
0), shape 1 etc. are registered.

Next, the user is requested to give an instruction regarding the via of the leading end of the extraction pattern. That is, since the automatic wiring connection destination is the tip via of the lead pattern connected to the original pin, the user is asked to answer which pin should be replaced with which via by viewing the screen display of the graphics terminal 17. At this time, looking at the screen on the graphics terminal 17, for example, instead of the component pin 1, the component via 1001
If you want to automatically wire to the component, the user executes a command to inform the system of this, and the component pin 1 and component via 1
Pick up 001.

Next, since the library is not hierarchized, the component pin and component via replacement automatic processing unit 18
Set the pin name, pin coordinate, and shape of the component pin 1 to the component via 100
1 via name, via coordinates / shape, and component via 100
The via coordinate of 1 is the pin coordinate of the component pin 1, and the component pin 1
The new pin name is named 1001 and registered. Since the component pin number does not change, there is no adverse effect on the netlist. As a result, the results are as shown in FIGS. That is, the component pin number 1 in the net list recognized by the CAD system.
Was replaced with the component via information at the tip of the extraction pattern 1001.

In addition, as a part of the automatic process of replacing the component pin and the component via, the component via information is registered in the library as the component pin information similar to the component pin information. If this work is performed manually, in addition to the problem of quantity, there is the trouble of finding the component vias by coordinates in order to use the component vias as the component pins and to replace the component pins with the component vias.

Next, the case where the library is hierarchized will be described. Although the hierarchical library 16 has already been shown in FIG. 4, FIG. 9 shows this more concretely, and shows the hierarchical library structure relating to the physical component before the replacement of the component pin and the component via. FIG.
0 is a diagram showing that the hierarchical library structure shown in FIG. 9 is displayed on the graphics terminal.
Further, FIG. 11 shows a hierarchical library structure showing that the target of the automatic wiring is changed from the component pin of FIG. 9 to a component via, and FIG. 12 shows the hierarchical library structure of FIG. 11 having a graphic terminal. It is a figure showing what was displayed on.

By the physical part information registration unit 11, as shown in FIG. 9, part name: A, part shape: rectangle, (-10, -2)
Register component information such as 0) and (40, 40). Next, the component pin information registration unit 12 registers a virtual pin such as virtual pin name 1A as the component virtual pin information. Next, the description will be continued regarding the case where the drawer pattern information registration unit 13 registers the drawer pattern. The extraction pattern information registration unit 13 registers attributes such as end point coordinates and pattern width of each segment of the extraction pattern in the library for each component virtual pin. Next, the component via information registration unit 14 causes the via coordinates (−10,
-20), shape (1), etc. are registered for each part virtual pin.

Next, the user is requested to give an instruction regarding the via of the leading end of the extraction pattern. That is, since the automatic wiring connection destination is the tip via of the lead pattern connected to the original pin, the user is asked to answer which pin should be replaced with which via by viewing the screen display of the graphics terminal 17. At this time, looking at the screen on the graphics terminal 17, for example, instead of the component pin 1, the component via 1001
If you want to automatically wire to the component, the user executes a command to inform the system of this, and the component pin 1 and component via 1
Pick up 001.

Next, since the library is to be hierarchized, the component pin and component via replacement automatic processing unit 19 is shown in FIG.
As in 1, the target pin name need only be changed from 1 to 1001. In this system, regarding automatic wiring, it is assumed that there is no difference in the information of the component pin and the component via in the component virtual pin. The result of this processing is displayed on the graphics terminal 17 as shown in FIG.

According to the present embodiment, the system corresponding to the hierarchical library makes it possible to register the information regarding the lead-out pattern and the tip component via thereof separately from the component information. Therefore, as shown in FIG. 13, since the logic is different between the parts A and B, there are two types of part information, but only one part virtual pin information is required. Also, as shown in FIGS. 14 and 5, when the same part A has different drawing patterns, only the part virtual pin information is changed with respect to the same part information without increasing the data amount significantly. There is an advantage that it can handle a plurality of pieces of drawing pattern information.

[0028]

As described above, according to the present invention, the target pin for automatic wiring can be automatically switched from the component pin to the component via by instructing the component pin and the component via to the target designating section. No manual replacement is required. Further, the data is hierarchized, and the physical component information is separated from the extraction pattern and the component via information, so that the library data amount can be reduced and the management complexity can be eliminated.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the operation of the embodiment of FIG.

FIG. 3 is a diagram showing a library structure when the libraries are not hierarchized.

FIG. 4 is a diagram showing a library structure when hierarchizing a library.

FIG. 5 is a diagram showing a library structure of a physical component stored in a library and before a target of automatic wiring is changed from a component pin to a component via.

FIG. 6 is a diagram showing physical parts and a drawing pattern displayed on the graphics terminal, which is shown in the library structure of FIG. 5;

7 is a diagram showing a library structure after the automatic wiring target of the physical component shown in FIG. 3 is changed.

FIG. 8 is a diagram showing physical parts and a drawing pattern displayed on the graphics terminal, which is shown in the library structure of FIG. 7;

FIG. 9 is a diagram showing a hierarchical library structure relating to a physical component before a component pin and a component via are replaced.

FIG. 10 is a diagram showing the hierarchical library structure shown in FIG. 9 displayed on a graphics terminal.

FIG. 11 is a diagram showing a hierarchical library structure showing that a component via has been replaced.

FIG. 12 is a diagram showing the hierarchical library structure shown in FIG. 11 displayed on a graphic terminal.

FIG. 13 is a diagram showing that the amount of data can be reduced when the hierarchical structure of this embodiment is not used.

FIG. 14 is a diagram showing that the amount of data can be reduced when hierarchization according to the present embodiment.

FIG. 15 is a diagram showing that the amount of data can be reduced when hierarchization according to the present embodiment.

FIG. 16 is a flowchart showing the operation of a conventional example.

FIG. 17 is a block diagram showing a conventional example.

[Explanation of symbols]

 11 physical component information registration unit 12 component pin information registration unit 13 extraction pattern information registration unit 14 component via information registration unit 15 library 16 hierarchical library 17 graphics terminal 18, 19 transfer automatic processing unit 20 CPU

Claims (2)

[Claims] 1. A CAD library, a physical component information registration unit for registering physical component information about a physical component, a component pin information registration unit for registering component pin information about a pin of a physical article, and a drawer related to a physical component. In a CAD system that includes a drawer pattern information registration unit that registers a drawer pattern when there is a pattern, and performs automatic wiring with the pin of a physical article as a target, the target pin and the target instead of the target pin A CAD system comprising: a target designating unit that designates a component via to be made to operate; and a reassignment automatic processing unit that uses the component via designated by the target designating unit as a target for automatic wiring instead of the pin. 2. A CAD library, a physical component information registration unit for registering physical component information about a physical component, a component pin information registration unit for registering component pin information about a pin of a physical article, and a drawer related to a physical component. In a CAD system that includes a drawer pattern information registration unit that registers a drawer pattern when there is a pattern, and performs automatic wiring with the pin of a physical article as a target, the target pin and the target instead of the target pin A target designating unit for designating a component via to be desired, and component pin information, component via information, and drawing pattern information registered in the CAD library are collectively managed as component virtual pin information, and the component pin information is a collection of these component virtual pin information. Instructed by the library layering unit represented by A CAD system having a replacement automatic processing unit that uses the created component via as a target for automatic wiring instead of the pin.