JPS62256172A - Automatic wiring system - Google Patents

Abstract

PURPOSE:To improve the speed of a wiring processing by providing ultimate attribute information or information relating to an existing wiring (induction island information) on an idle grid on a standard grid. CONSTITUTION:The decision that there is an existing segment is performed at high speed by using an induction island N on the standard grid previously provided with respect to the existing segment. Since this is a wiring processing system which performed by passing on the standard grid M and between the standard grids M, in a wiring processing for searching a path by using the ultimate attribute information Ma set correspondingly to the idle grid of the standard grid M, the information (induction island information) Na relating to the existing wiring is provided on the standard grid M and and the path search using the existing wiring is performed by using the induction island information Na (Na-1, Na-2).

Description

[Detailed Description of the Invention] [Summary] In an automatic wiring method in the field of computer-aided design (CAD), etc., arrival attribute information or information regarding existing wiring (guide island information) is provided on empty grids on a standard grid. By doing so, the route search based on the arrival attribute information can be expanded.
When the wave reaches one of the guided products, the route search is performed by spreading the "wave" for route searching from all the guided islands with the same existing wiring that are related to the guided island. This is how it was done.

[Industrial application field]

The present invention relates to an automatic wiring system for multi-point wiring.

With the recent trend toward higher density of elements in highly integrated (LSI) circuits, printed circuit boards, etc., computer-aided design (CAD)
There is an increasing demand for automatic wiring methods to be faster.

Among the automatic wiring methods mentioned above, in wiring processes that involve many connections between multiple points, such as power lines, it is necessary to effectively utilize existing wiring in order to shorten the overall wiring length. .

To do this, it is necessary to know that existing wiring exists in the middle of the wiring route when searching for the route of the wiring, but knowing this directly from the existing line segment data poses a problem in processing speed. Therefore, there is a need for a method for quickly knowing the existence of the existing wiring.

[Prior art and problems to be solved by the invention] FIG. 4 is a diagram explaining a route search method according to the prior art.
Part a) shows the concept of route searching using the maze method, and part (b) shows the concept of generating "waves" performed in route searching using the maze method.

As a conventional route search method, the maze method is a commonly used method.

In this maze method, first, from the starting point S, a lattice point (1) that can be wired is determined from a maximum of four surrounding lattice points, for example, in a clockwise direction. This method.

It is said to spread the waves. (See figure (b)) It is determined whether the tips of the "waves" have reached the destination point T, and if they have not, as shown in the figure, the tip of each "wave" has reached the destination point T. Spreads the wave to a maximum of 4 grid points.

The lattice points obtained in this way are (2) to (8). If none of the "waves" are expanded, the route search is deemed to have failed and the process is terminated.

The numbers (1 to 8) in the figure each indicate the level of the wave, and by tracking the number, you can determine the level of the wave.

You can see how it spreads out, and the larger number is the grid point that is spread out from the one smaller.

If a wiring path exists, then the beginning of the line.

In other words, this is when the wave with the largest number (8 in this example) reaches the destination point T.

When an existing wiring is discovered while searching for a route using such a maze method, the wiring information of the existing wiring is
Only the point reached (for example, point R) is described.

This means that the wiring information for each grid point includes the net number (NET), attributes (dotted line/solid line/-・-), a pointer to the line segment table (indicating the start point coordinates and end point coordinates of the wire), and " There are various levels of waveforms, etc., and it becomes impractical to write all the wiring information for the existing wiring for each route search because of the storage capacity as the wiring density increases. He used a descriptive method.

Therefore, when an existing wiring is found during the route search, the line segment table is referenced from the pointer of the wiring information at that point, and after recognizing that the cough point is part of the existing wiring, It was necessary to calculate the coordinates of all grid points of the existing wiring from the line segment table and write wiring information at each grid point. In particular, when the existing wiring consists of a plurality of line segments, it is necessary to search for another line segment table using the pointer provided in the line segment table.

Calculating the grid point coordinates of existing wiring using this line segment table had the problem that the line segment table had to be referenced each time for each existing wiring discovered during route search, and the wiring processing took time. .

In view of the above-mentioned drawbacks of the conventional art, an object of the present invention is to provide an automatic wiring method that introduces the concept of induction products that can quickly determine whether or not an existing line segment has been encountered, in order to speed up wiring processing. That is.

[Means for solving problems]

FIG. 1 is a diagram illustrating the route search means using the induced product of the present invention, (a) to (d) show a conceptual diagram of the route search, and (e) shows the concept of arrival attribute information. , (f) shows the concept of derivatives.

In the present invention, by using a guide (indicated by .) N on a standard grid provided in advance for an existing line segment K, it is possible to quickly determine whether an existing line segment has been encountered. That is, it is a wiring processing method that runs on a standard grid and between the standard grids, and has an empty grid between the standard grids.

In the wiring process that performs a route search using the arrival attribute information Ma (see figure (e)) that is set corresponding to
Na (see figure (f)), and the induced island condition Qfj
Route search using the existing wiring using Na (Na-1, Na-2, -) ((a) =O(b) =O(c)
=O(d).

[Effect]

That is, according to the present invention, in an automatic wiring system in the field of computer-aided design (CAD), etc., by providing arrival attribute information or information regarding existing wiring (derivative product information) on an empty grid on a standard grid, , when the "wave" spread by the route search based on the arrival attribute information reaches one of the guided products, a wave for route search is generated from all the guided products of the same existing wiring that are related to the guided product. Try to spread it out,
Since the route search is performed, existing line segments can be used directly from the wiring information attached to the coordinates of the wiring grid, and the speed of wiring processing can be improved.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram schematically showing an embodiment of the present invention,
FIG. 3 is a flowchart showing the route search operation according to the present invention, and the arrival attribute information Ma, guided product information Na, and related mechanisms in FIG. 2 are necessary means to implement the present invention. .

The automatic wiring system according to the present invention will be described below with reference to FIGS. 1 and 2 and the operational flow shown in FIG. 3.

First, the central processing unit (CPU) 20 is the main memory (?
! 5) By executing a specific route search processing flow program 21b loaded on the route search processing program 21b, a route search is performed according to the flow shown in FIG.

At this time, the standard lattice table 21a on the main memory (MS) 21 is referred to. Dano standard lattice table 21a
is the arrival attribute information Ma for the vacant standard grid,
For grids for which guidance axis information and existing line segments have been obtained, wiring information Ka is set.

In order to perform the route search according to the present invention, the above-mentioned arrival attribute information Ma, which is one of the wiring information provided on each standard grid, is used.

As shown in FIG. 1(e), the arrival attribute information Ma is, as shown in FIG. This is information indicating whether or not it is possible, and is usually stored in coded form.

The above-mentioned types of reachability include: (1) It is possible to reach from that grid point by passing on the standard grid. ■It can be reached through the lattice space above that lattice point. There are two types.

Necessary information other than this can be obtained from the grid points adjacent to that grid point.0For example, in the above (■), the possibility of reaching point B that point A has is It can be thought of as the possibility of reaching point A from point A.

As mentioned above, this arrival attribute information Ma indicates a route that can be routed from the grid point, and there is no need to search for an empty route, for example, in a clockwise direction, as in the conventional method.
Waves that show route candidates quickly and with small storage capacity
can be generated.

Using this ``wave'' generation method, route search is performed in the following steps.

Step 10: Check whether the destination point (T) has been reached, and if not, move on to the next step.

When the route has been reached, the route search process ends.

Step 11: Spread the waves at high speed using the arrival attribute information gate a on each standard grid.

Step 12: Check whether the tip of the expanded wave is the induced product N. If it is not the induced product N, return to step 10, but if it is the induced product N, proceed to the next step 13.

Step 13: Since the derivatives N provided corresponding to the same existing line segment K have information Na-2 (see Fig. 1(f)) linking each derivative N, the corresponding Using the link information Na-2, all derivatives N having the same number are given the same level number (4' in the example in Figure 1).
), and after that, the next wave (in the example of FIG. 1, the wave with level number 5') is spread simultaneously from all of the same derivatives N. Then, return to step 10. Repeat the same process.

The derivative N is shown in Fig. 1 (a), (b), (f).
As shown in FIG. 3, this is generated for all existing line segments K belonging to the net to be routed.

The existing line segments are divided into on-grid line segments on the standard lattice (M) and off-grid line segments between the ribs on the standard lattice (M), as shown in FIG.

When a new line segment K is generated and registered through one wiring process, before starting the next wiring process, an ff1A island N is generated for the line segment K, and a pointer (Na-2
) to link.

Such information (Na) regarding the derivative N is given only to the standard grid, which is the unit of route search. As a result, it is possible to judge whether or not the induced product N has been encountered directly from the wiring information (Na) related to the induced product provided at the coordinates of the standard grid gate, and the time required for this determination can be ignored. be able to.

For example, the derivative N has a derivative number (Na-1),
This number identifies each product as a derivative of a different existing line segment. All derived products N generated from one line segment K have the same derived product number, and if two or more line segments are electrically connected, these derived product numbers will be the same. . Are these same derivative products linked information? a(
Since they are linked by Na-2), their respective coordinates can be known at high speed.

That is, if a standard lattice genus is a derived product N, the existing line segment K that generated the derived product N can be immediately found (specifically, using a pointer).

In addition, the derivative information (Na) includes the above-mentioned attributes.

It has information such as the level of the wave and the attainment attributes.

In the above explanation, an example was given in which the above-mentioned derivative N was used to search for a route from a starting point S to a destination point T, but as is clear from FIGS. 1(a) to (d), Using the same method, it is possible to connect a specific standard lattice gate to an existing line segment over the shortest distance, and wiring processes that connect multiple points, such as power supply wiring, can be executed at high speed.

That is, as mentioned above, the induced product N is indirectly connected to the existing line segment by the pointer, so by spreading a "wave" to the induced product N, the induced product N is immediately connected to the existing line segment by the pointer.
It is possible to connect to an existing line segment via .

As described above, in an automatic wiring method for wiring on a standard grid or between standard grids, the present invention provides arrival attribute information indicating possible wiring directions on empty grids of the standard grid, and registers new line segments. Each time, a derived product grid is provided for the existing line segment, and from one starting point S, if the grid point reached by spreading the wave at high speed is a derived product, based on the above-mentioned arrival attribute information. Generates "waves" of the same level for all induced products generated by the existing line segment that generated the induced products, and thereafter "waves" are spread from the induced products all at once to speed up wiring processing. There is a characteristic in the way it is done.

[Effects of the Invention] As explained above in detail, the automatic wiring method of the present invention is used in the field of computer-aided (CAD) design, etc., to place arrival attribute information, Alternatively, by providing information regarding existing wiring (guided product information), when the wave spread by the route search using the arrival attribute information reaches one of the guided products, it is possible to connect the same existing wiring related to the guided product. Since the route search is performed by spreading the waves for route search from all of the wiring derivatives, existing line segments can be directly searched from the wiring information attached to the coordinates of the wiring grid. This has the effect of increasing the speed of wiring processing.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating a route searching means using a guide according to the present invention. FIG. 2 is a diagram schematically showing an embodiment of the present invention. FIG. 3 is a flowchart showing the route search operation according to the present invention. FIG. 4 is a diagram illustrating a route search method according to the prior art. It is. In the drawings, n is a standard grid. Ma is the attained attribute information, N is the induced product. Na is derivative information (Na-1, Na-2, ---). 10 to 13 are operation steps. 20 is a central processing unit (CPU), and 21 is a main memory (MS). 21a is a standard grid table. 1 to 8 are the wave level numbers.・ is a derivative, ○ is a lattice. S is the starting point, T is the destination point. are shown respectively. 1 million figures (+01) $3 figures

Claims (1)

[Scope of Claims] A wiring processing method that is performed at least on a standard grid (M) and between the standard grids (M),
) arrival attribute information set corresponding to the empty grid (
In the wiring process that performs a route search using the standard grid (H), information regarding the existing wiring (guidance island information) (Na) is provided on the vacant grid of the standard grid (H), and the guidance island information (N
An automatic wiring method characterized in that a) is used to search for a route using the existing wiring.