JPS6367679A - Automatic wiring method - Google Patents

Abstract

PURPOSE:To ensure a high wiring factor at high speed in an automatic wiring system by combining the characteristics of a riber method that assures the high-speed searching properties and a highly efficient wiring procedure and the characteristics of a meys method that always detects a route if exists. CONSTITUTION:A searching segment 3 moving down from a start point 1 of a pin pair along a peculiar line 2 having its search priority direction set downward travels along a fault 4 and avoiding this fault 4 at the right side. Then the segment 3 hits a fault 5 and carries on searching like a searching segment 6. When the segment 6 meets the line 2, the searching direction of the segment 6 is changed to the down side with preference to be followed by a searching segment 7. Then the segment 7 hits the fault 5. At this time point, the latest spot where a searching action is carried out on the line 2 is equal to a peculiar point 8. The searching job is taken over by a searching segment 9 and reaches a closed loop point 10 so that a fault exists at a pointer near the right side of a traveling course. Then the searching segment travels again by a right moving rule to perform the searching job like the segment 6.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic wiring method, in particular, to an automatic wiring method for optimal wiring layout in CAD for printed circuit boards, hybrid ICs, etc. of electrical CAD systems. .

[Conventional technology]

Conventional automatic wiring methods do not allow wiring even if a wiring route exists.
If , is a complicated route, there are many cases where it is not always possible to see 5, so it is definitely a route? As a method for finding
m for Path Connections an
d Its Applications, IRE Tra
ns, Electron, Co-mput,, Vol.
, ECl0. pp. 346-365 (1961). However, since the noise method searches for a route so as to spread ripples on a plane, it requires more processing time than other automatic wiring methods.

Proc, 12th Annual ACM Sy
mp, on Theory of Computi
ng, pp. 161-176 (1980)) is a method in which a route is searched along a straight line and the search direction is changed as necessary, and the processing speed is fast. Moreover, this method is different from other automatic wiring methods because it considers the connection order of multiple pin pairs, that is, pin bears, all at once.
'L, no efficient wiring procedure is seen.

Fast Maz method (Soukup, J.: Fast Maz
eRouter, Proc, 15th Design
Out.

tion Conf,, pp, 100-102 (
Although Maze methods with fast processing times have been announced, such as 1978), they do not have such efficient characteristics.

Next, the river method among conventional automatic wiring methods will be explained in detail with reference to the drawings. FIG. 3 is a layout diagram showing an example of the river method of the conventional automatic wiring method. Starting point 19
A search line segment 21 moves downward along a singular line 20 drawn directly below the point , and encounters an obstacle 22 . Here search line segment 21
changes direction so that the obstacle is always near the right hand in the direction of travel, and then continues along the obstacle as shown by the search line segment 23 according to this law. When the search line segment 23 encounters the singular line 24, the direction is preferentially changed upward and the search proceeds as in the search line segment 25. The search is completed when the end point 26 is reached and the wiring route from the start point 19 to the end point 26 is obtained by the search line segments 21, 23, and 25.

[Problem that the invention seeks to solve]

The above-mentioned conventional automatic wiring method, Reno (- method, does not always discover the wiring route even if it exists, if it is a complicated route, unlike the noise method. It is a layout diagram showing an example of route discovery failure.A search line segment 3 descends from the starting point 1 of a pin pair along a singular line 2 whose search priority direction is downward, while avoiding an obstacle 4 on the right. Proceed along the obstacles, hit obstacle 5, and proceed with the search like search line segment 6. Search line segment 6 hits obstacle 5, and the search continues with search line segment 9. Search so that the obstacle is near the right hand side of the direction and reach closed loop point 10.This point has already been searched, so even if you repeat the same search rule from here C, the same search will not be repeated. , the search ends in failure without getting past obstacle 5.

In other words, the conventional river method has the disadvantage that it is impossible to escape from a fault and cannot be wired due to the presence of the singular line 2.

[Means for solving problems]

The automatic wiring method of the present invention is to draw a first singular line that searches directly below the connection start point to the bottom edge of the board, preferentially searching downward along that line segment, and searches directly below the connection end point to the bottom edge of the board. A singular line setting step in which a second singular line is drawn upwardly along the line segment; and a step in which the connection is started, except when the search point is on the first singular line or the second singular line. A first route search stage in which the wiring route is searched from a point to the right hand so that an obstacle exists in the vicinity of the right hand direction with respect to the traveling direction, and a search point is located on the first singular line in the first route search stage. Therefore, even if there is no obstacle near the right hand direction, the latest point that led to the search proceeding downward is stored as the first singular point, and since the search point is on the second singular line, there is no fault near the right hand direction. Even if there is no singular point, the search continues upward, and the latest point is stored as a second singular point, and the first search step is applied to store the connection start point and the connection end point. If the points cannot be connected, the characteristics of the singular line from the connection start point to the first singular point are invalidated, and the singular line from the point where the second singular line intersects the bottom side of the board to the second singular point is disabled. and a second route searching stage in which the characteristics of the route searching stage are invalidated and the search is resumed using the same search rule as the first route searching stage.
Ru.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a layout diagram showing an embodiment of the present invention.

Search line segment 3 descends from Bin Bear's starting point 1 along singular line 2 whose search priority direction is downward, moves along the obstacle while avoiding obstacle 4 on the right, and hits obstacle 5. The search is further advanced as shown in the search line segment 6. During such a search, the extent to which the search has been made is sequentially stored on the singular line 21 as a singular point. When the search line segment 6 encounters the singular line 2, the search direction is preferentially changed downward and is taken over by the search line segment 7, and the search line segment 7 collides with the obstacle 5. At this point, the latest point searched on singular line 2 is singular point 8. The search follows the search line segment 9 and searches for an obstacle near the right hand in the direction of travel until a closed loop point 10 is reached.

This point has already been searched, but since closed loop point 10 is located between starting point 1 and singular point 8, should we search again?
Execute. The re-search goes back through the search line segment 9°7.6, returns to the closed loop point 10, and restarts from there.

From this closed loop point 10, proceed again according to the right hand rule and search as shown in the search line segment 6. Search line segment 6 is singular line 2
However, since this point is located between the starting point 1 and the singular point 8, the downward preferential search characteristic of the singular line 2 has no effect, and the search line segment 6 follows the right-hand rule. The search line segment 11 is adapted as it is and carried over to the search line segment 11. The search proceeds along the obstacle 5, and when the search line segment 12 reaches the singular line 2, this point is not between the starting point 1 and the singular point 8, so
4! The effect of specifying the priority direction of the IF unusual line 2 is effective, and the search line segment 12 descends downward along the singular line 2 preferentially. The search line segment 12Fi hits the obstacle 13 and changes direction so that the obstacle is near the right hand side in the direction of travel, and the search proceeds along the obstacle 13 as the search line segment 14. When the search line segment 14 encounters the second singular line 15, it preferentially changes its direction upward. The search line segment 14 encounters an obstacle 16, moves along the obstacle 16 to the right, and encounters the singular line 15 again. Here, the direction is changed preferentially upward, and the search line segment 17 takes over and proceeds upward along the singular line 17, ending at the end point 1.
Reach 8 to complete the search.

FIG. 2 is a diagrammatic illustration of the embodiment of FIG. 1.

〔Effect of the invention〕

The automatic wiring method of the present invention does not lose the characteristics of the River method, such as high-speed search performance and efficient wiring procedures, and also has the important characteristic of always finding a route, if any, than the Maze method. The second advantage is that a high wiring rate can be quickly obtained during automatic wiring execution.

[Brief explanation of the drawing]

Figure 1 is a layout diagram showing one embodiment of the present invention, and Figure 2 is the procedure for the automatic wiring method shown in Figure 1. 7°−7・−
1. Figure 3 $9 (D-Example)... Starting point, 2... Singular line, 3... Search line segment, 4
~5... Obstacle, 6~7... Search line segment,
8... Singularity, 9... Search line segment, 10
......Closed loop point, 11-12...-Search line segment, 13...Obstacle, 14...Search line segment, 15...Singularity Line, 16... Obstacle,
17...search line segment, 18...end point,
19...Starting point, 20...Singular line, 2
1...search line segment, 22...obstacle, 23
...Search line segment, 24...Singular line, 25
...Search line segment, 26...End point. )・Representative Patent Attorney Susumu Uchihara-2-

Claims (1)

[Claims] Draw a first singular line that preferentially searches from the connection start point to the bottom edge of the board, and searches downwards along that line segment. and a singular line setting step in which a second singular line is drawn in the upward direction, and the wiring route is moved in the traveling direction from the connection starting point except when the search point is on the first singular line or the second singular line. On the other hand, there is a first route search stage in which the search is performed in a right-hand manner because there is an obstacle in the vicinity of the right hand direction, and in the first route search stage, there is an obstacle in the vicinity of the right hand direction because the search point is on the first singular line. Even if there is no obstacle, the search continues downward.The latest point that led to the search is stored as the first singular point.Since the search point is on the second singular line, even if there is no obstacle near the right hand direction, the search continues upward. A singularity storage stage in which the latest point at which the search has proceeded is stored as a second singularity, and a singularity storage stage in which the first search stage is applied to the case where the connection start point and the connection end point cannot be connected. The characteristic of the singular line from the connection start point to the first singular point is invalidated, and the characteristic of the singular line from the point where the second singular line and the lower side of the board intersect to the second singular point is invalidated, An automatic wiring method characterized by comprising a second route searching stage in which the search is restarted using the same search rule as the first route searching stage.