JP3538158B2 - Automatic wiring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to an automatic distribution SenSo location to determine its wiring route in order to automatically route the wiring pattern on the wiring board having a plurality of component pins. Recent semiconductors (LSI), multi-chip modules (MCM),
In a printed wiring board and the like, it is necessary to mount and arrange components at a high density and to perform wiring in a short period of time with fewer signal layers. With the reduction of margin (degree of freedom) due to such high density and high performance, it has become extremely difficult to solve various wiring problems and placement problems with one fixed algorithm. It is necessary to establish high performance automatic wiring technology and automatic placement technology.

[0002]

2. Description of the Related Art As a general automatic wiring means for determining a wiring route for automatically wiring a wiring pattern on a wiring board having a large number of component pins, for example, a line search method or a maze method is used. What is called is known. In the line search method, for example, as shown in FIG.
When two points where wiring patterns are to be wired on the printed wiring board 110 are given as a start point (component pin) 111 and an end point (component pin) 112, a wiring route from the start point 111 to the end point 112 is as follows. Is determined.

That is, on the printed wiring board 110,
An appropriate direction from the start point 111 to the end point 112 is selected, and the primary search line 113 is drawn from the start point 111 in that direction (to the right in the example shown in FIG. 10). In this case, the first
Since the next search line 113 cannot reach the end point 112, next, from an appropriate position on the primary search line 113, an appropriate direction orthogonal to the primary search line 113 and approaching the end point 112 ( The secondary search line 114 is drawn in the downward direction in the example shown in FIG.

At this time, the second search line 1
Since the end point 112 cannot reach the end point 112 because of the wiring prohibited area (the part indicated by the mark x in FIG. 10), the tertiary line 14 is orthogonal to the secondary search line 114 in the same manner as described above. Search line 115, this third search line 1
A fifth search line 116 orthogonal to the fourth search line 116, a fourth search line 116 orthogonal to the fourth search line 116,
By sequentially drawing from an appropriate position on the previous line, the fifth search line 117 finally reaches the end point 112.

The primary search line 11 thus drawn
The printed wiring board 1 is connected to the third to fifth search lines 117.
On 10, a wiring route of a desired wiring pattern from the start point 111 to the end point 112 is determined. On the other hand, in the maze method, for example, as shown in FIG.
In the above, when two points to which a wiring pattern is to be wired are given as a start point (component pin) 121 and an end point (component pin) 122, a wiring route from the start point 121 to the end point 122 is determined as follows. I have.

That is, in the maze method, as shown in FIG.
Assuming a mesh on the printed wiring board 120 with the pattern width of the wiring pattern as a basic unit, a starting point 121 to an ending point 1
A wave is generated toward 22. This wave has a starting point 12 as shown as a circled number in each mesh in FIG.
Attach a mesh adjacent to the mesh where 1 exists,
By assigning numbers to the meshes adjacent to the meshes in the same manner, and sequentially assigning numbers to the adjacent meshes in the same manner, the robot reaches the start point 121 to the end point 122.

In the example shown in FIG. 11, the mesh having the end point 122 is the eighth mesh from the start point 121. Each mesh that such a wave travels from the start point 121 to the end point 122 is stored in order, and when the wave reaches the end point 122, the position of the mesh through which the wave travels from the end point 122 to the start point 121 is reversed. That is, the wiring trace 123 of the wiring pattern is determined by back tracing.

[0008] Also in FIG. 11, meshes marked with "x" indicate wiring prohibited areas.

[0009]

However, in recent years, the physical and electrical design conditions resulting from the rapid progress of high-density mounting, low cost, and high speed have become severe, and automatic wiring has been performed for a long time. However, it is difficult to find the optimal solution expected by the designer, and many unwired portions are left.

On the other hand, in the line search method described above with reference to FIG. 10, a wiring pattern is set to a straight line (the search lines 113 to 117).
Therefore, when it is determined whether or not a pattern can be passed, a graphic operation is required to determine the positional relationship of the straight lines, which consumes an enormous amount of time. As a result, it was not possible to sufficiently search for the route of the wiring pattern.

In the maze method described above with reference to FIG.
Since the basic mesh has a pattern width, the data volume becomes huge each time the area of the printed wiring board 120 is large and the pattern width is narrow, and the number of meshes to search for a passable route increases. , And required a great deal of exploration time. Therefore, in order to route wiring patterns with high density, it is necessary to search for traffic routes for many routes and many combinations.However, since high-speed searching could not be performed, routes that could not be searched for were generated, and high-density wiring was required. Was inhibiting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problems. an object of the present invention is to provide a SenSo location.

[0013]

FIG. 1 is a view for explaining the principle of the present invention. In FIG. 1, reference numeral 12 denotes a wiring board;
A and 13B are a number of component pins on the wiring board 12, and 14 is a straight line connecting adjacent component pins 13 (13A and 13B) and is defined as a chord. And the present invention
Waves in the adjacent component pins 13 (13A, 13B) a straight line connecting between defined as chord 14, maze router wiring toward the starting point (component pin) 13A of the wiring route 15 to the end point (component pin) 13B Is generated, the wave is propagated between adjacent strings 14, and the positions of the strings 14 that the wave has passed from the start point 13A to the end point 13B are sequentially stored.
Upon reaching B, the position of the string 14 through which the wave has passed from the end point 13B to the start point 13A is reversed, and the wiring route 15 of the wiring pattern is determined.

When a wave is propagated between adjacent strings 14, the component pins 13 (13A, 13A) constituting the strings 14 are used.
It may be determined based on the capacitance between B) whether or not the wiring pattern can pass. In this case, the string 1
4 and the line width of the wiring pattern that has been allowed to pass on the string 14 up to this time is calculated as a total width, and the total pin width and the component pin 13 forming the string 14 are calculated.
The distance between (13A, 13B) is compared, and if the total width is smaller than the distance, the passage of the wiring pattern is permitted.

Further, when a plurality of wiring patterns are allowed to pass on the string 14, the passing position of each wiring pattern on the string 14 is stored as a relative position on the string 14 so that adjacent wiring patterns are stored. When at least two wiring patterns pass over the string 14 to be changed, the intersection of the wiring patterns is determined based on the relative position of each wiring pattern on the adjacent string 14.

Further, after all the wiring routes 15 of the wiring patterns on the wiring board 12 are determined, the wiring patterns passing on the strings 14 may be evenly wired between the component pins 13 (13A, 13B). FIG. 2 is a block diagram showing the principle of the present invention. In FIG.
This is an automatic wiring device for determining a wiring route 15 (see FIG. 1) for automatically wiring a wiring pattern on a wiring board 12 (see FIG. 1) having 3A and 13B (see FIG. 1). The automatic wiring device 20 of the present invention includes
And maze wiring control means 22.

Here, the string information creating means 21 converts the positional information of the string 14 (see FIG. 1) which is a straight line connecting the adjacent component pins 13 (13A, 13B) into the component pin 13 (13
A, 13B). Further, the maze wiring control means 22 generates a wave of the maze method wiring from the start point 13A of the wiring route 15 to the end point 13B, and adjoins the waves based on the information of the strings 14 created by the string information creating means 21. The position of the string 14 that was propagated between the strings 14 and passed from when the wave reached the start point 13A to the end point 13B is stored in order. When the wave reached the end point 13B, the wave passed from the end point 13B to the start point 13A. String 1
The position 4 is reversed to determine the wiring route 15 of the wiring pattern.

Further , in the automatic wiring device 20, when a wave is propagated between adjacent strings 14 by the maze wiring control means 22, component pins 13 (13A, 1A) forming the strings 14 are used.
3B) is provided with pass / fail judgment means ( not shown in FIG. 2) for judging whether or not the wiring pattern can pass based on the capacitance between them .
Have been . In this case, the pass / fail determination means determines the total width of the line width of the wiring pattern that passes through the string 14 by the propagation of the current wave and the line width of the wiring pattern that has been permitted to pass on the string 14 by this time. , A comparing means for comparing the total width calculated by the adding means with the distance between the component pins 13 (13A, 13B) constituting the string 14, and a result of the comparison by the comparing means. And determining means for permitting the passage of the wiring pattern when the total width is smaller than the distance.

Further, the string 14 is determined by the passage possibility determining means.
If you allow multiple wiring patterns to pass over,
The passing position of each wiring pattern on the string 14 is determined by the string 14
When at least two wiring patterns pass over an adjacent string 14, the automatic wiring device 20 stores the relative position of each wiring pattern on the adjacent string 14. Intersection determining means for determining the intersection of the wiring patterns in the same manner.

Further, in the automatic wiring device 20, after the wiring route 15 of the wiring pattern on the wiring board 12 is completely determined by the maze wiring control means 22, the wiring pattern passing over the string 14 is connected to the component pins 13 (13A, 13B). It may be provided with an equal allocation means for evenly wiring between them. Automatic arrangement SenSo location of the present invention described above, FIG. 1, as shown in FIG. 2, first, the chord information creating means 21, the adjacent component pins 13 (13A, 13B) between a straight line chord 14 connecting the The position information of the string 14 is defined and the component pin 13 (1
3A, 13B).

The maze wiring control means 22 generates a wave of the maze method wiring from the starting point (component pin) 13A of the wiring route 15 to the end point (component pin) 13B, and transmits the wave between the adjacent strings 14. Propagate and store the positions of the strings 14 that the wave has passed from the start point 13A to the end point 13B in order, and when the waves reach the end point 13B, reverse the position of the string 14 through which the wave passed from the end point 13B to the start point 13A. By doing so, the wiring route 15 of the wiring pattern is determined.

Therefore, the chords 14 having a distance between the component pins 13 larger than the wiring pattern as a basic unit can be a wave propagation target without using a rectangular mesh depending on the wiring pattern width. The wiring route 15 of the wiring pattern can be determined. When a wave is propagated between the adjacent strings 14 by the maze wiring control means 22, the passage possibility determination means performs wiring based on the capacitance between the component pins 13 (13A, 13B) forming the strings 14. By determining whether or not a pattern can pass, it is possible to prevent an unwiringable number of wiring patterns from passing between the component pins 13 (on the strings 14) and to determine whether or not the pattern can pass in a short time. Can be.

In this case, the total width of the line width of the wiring pattern that is allowed to pass on the string 14 by the propagation of the current wave by the adding means and the line width of the wiring pattern that has been allowed to pass on the string 14 by this time. Is calculated by the comparing means, and the total width is compared with the distance between the component pins 13 (13A, 13B) forming the string 14. If the total width is smaller than the distance by the determining means, wiring is performed. By permitting the passage of the pattern, it is possible to prevent the passage of a wiring pattern having a width exceeding the distance between the component pins 13 (the length of the string 14).

When a plurality of wiring patterns are allowed to pass on the string 14 by the passage possibility determination means, the automatic wiring device 20 determines the passing position of each wiring pattern on the string 14 , The position of the wiring pattern that has already been allowed to pass can be treated as a relative position on the string 14, so that a new wiring pattern is provided between the component pins 13 (on the string 14). In such a case, the position of an existing wiring pattern can be easily moved, and a new wiring pattern can be easily inserted.

Further, as described above, the passing positions of the plurality of wiring patterns on the strings 14 are stored as relative positions, so that when at least two wiring patterns pass on the adjacent strings 14, the intersection determination means , Adjacent string 14
Based on the relative positions of the wiring patterns described above, it is possible to easily determine the intersection of the wiring patterns without performing any complicated calculation or the like.

After all the wiring routes 15 of the wiring patterns on the wiring board 12 are determined by the maze wiring control means 22, the wiring patterns passing over the strings 14 are automatically assigned to the component pins 13 ( 13A, 13B).

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing an automatic wiring device as one embodiment of the present invention. First, a printed wiring board 70 to be automatically wired according to the present embodiment will be described with reference to FIG. 4. The printed wiring board 70 has a large number of component pins 71 (71A, 71B). Here, for example, a wiring route is automatically determined between a start point (component pin) 71A and an end point (component pin) 71B to determine a wiring route.

Then, as shown in FIG. 3, the automatic wiring device 60 of the present embodiment has a large number of component pins 71 shown in FIG.
(71A, 71B) for determining a wiring route for automatically wiring a wiring pattern on a printed wiring board 70, a database 61, a wiring database 62, a string information creating unit 63, a maze wiring control unit 64, a uniform allocation section 65, a passability determination section 66, an intersection determination section 67, and a traffic data insertion section 68.

Here, the database 61 stores various kinds of connection information and component pin information on the printed wiring board 70 necessary for automatic wiring, wiring pattern information as a result of automatic wiring by the automatic wiring device 60, and the like. is there. The wiring database 62 stores, during the automatic wiring processing according to the present embodiment, various information on the printed wiring board 70 to be automatically wired (passage information of wiring patterns, position information of strings 72 described later, and the like). .

The string information creating section 63 reads the component pin information from the database 61, and as shown in FIG. 4, the position information (wiring pattern) of the string 72 which is a straight line connecting the adjacent component pins 71 (71A, 71B). Basic data for storing the traffic information of the vehicle) to the component pins 71 (71A, 71B).
Is created on the basis of the position information and written in the wiring database 62.

The maze wiring control unit 64 generates a wave of the maze method wiring from the start point 71A of the wiring route to the end point 71B in the wiring database 62, and the information of the string 14 created by the string information creating unit 63. The wave is propagated between the adjacent strings 72 on the basis of
The positions of the strings 72 that have passed before reaching the first point 1B are stored in order, and when the wave reaches the end point 71B, the position of the string 72 through which the wave has passed from the end point 71B to the start point 71A is reversed (back traced), and wiring is performed. This determines the wiring route of the pattern.

That is, the maze wiring control unit 64 of the present embodiment generates a wave from the starting point 71A to the ending point 71B on the printed wiring board 70 assumed in the wiring database 62, as shown in FIG. This wave has a starting point 71 as shown as a circled number on each string 72 in FIG.
A is attached on the string 72 closest to A, a string 72 adjacent to the string 72 with A is attached, and so on.
Are sequentially numbered, thereby reaching the start point 71A to the end point 71B.

In the example shown in FIG. 4, the end point 71B arrives next to the third chord 72 from the start point 71A.
Each chord 72 that such a wave travels from the start point 71A to the end point 71B is stored in the wiring database 62 in order, and when the wave reaches the end point 71B, the end point 71B
The wiring route 73 of the wiring pattern is determined by going backwards, that is, back-traces the position of the chord 72 through the wave from B to the starting point 71A.

Then, in FIG.
Is determined by the maze wiring control unit 64 after all the wiring routes of the wiring pattern on the printed wiring board 70 are determined.
The wiring pattern passing over the component pins 71 (71A, 7A)
1B). Further, the passability determination unit 66 is provided in the maze wiring control unit 64, and when the maze wiring control unit 64 propagates a wave between the adjacent strings 72, the component pins 71 (71A, 71) constituting the strings 72
It is to judge whether or not the wiring pattern can pass based on the capacitance between B).

Then, the pass / fail judgment section 66 of this embodiment
Is composed of an adder 66A, a comparator 66B, and a determiner 66C. The adding unit 66A calculates the total width of the line width of the wiring pattern that passes through the string 72 due to the propagation of the current wave and the line width of the wiring pattern that has been allowed to pass through the string 72 up to this time. It is. Also, the comparison unit 66
B compares the total width calculated by the adding unit 66A with the distance between the component pins 71 (71A, 71B) forming the string 72 (known data given as component pin information from the database 61). To do. Further, the determination unit 66C determines, as a result of the comparison by the comparison unit 66B,
When the total width is smaller than the distance, the passage of the wiring pattern is permitted.

Further, the wiring database 6 of the present embodiment
In 2, in the case where a plurality of wiring patterns are allowed to pass on the string 72 by the passage possibility determination unit 66, the passing position of each wiring pattern on the string 72 is determined by the relative position on the string 72 (wiring pattern). The intersection of the wiring route and the string 72 is the string 72
Where it is above).

The intersection judging section 67 is provided in the maze wiring control section 64, and when at least two wiring patterns pass on the adjacent chord 72, the relative position of each wiring pattern on the adjacent chord 72 ( The intersection of the wiring pattern is determined based on the information stored in the wiring database 62). Further, when the maze wiring control unit 64 causes the maze wiring control unit 64 to propagate the wave between the adjacent strings 72, the traffic data insertion unit 68
When a wiring pattern is passed over the string 72, the traffic information of the wiring pattern is registered in the wiring database 62, and when a plurality of wiring patterns are allowed to pass over the string 72 by the passability determination unit 66. The relative position on the chord 72 of the wiring pattern to be passed last is appropriately shifted, if necessary, while considering the relative position on the chord 72 of the wiring pattern already permitted to pass. The target position is registered in the wiring database 62 as traffic information of a new wiring pattern.

The automatic wiring device 60 configured as described above
The automatic wiring method of this embodiment realized by
This will be described with reference to FIG. For example, FIG.
When a wave for maze wiring is propagated from the position p to the position q as shown in (b), the maze method using the mesh described with reference to FIG. 11 is used, as shown in FIG. Is set, the wave must pass through at least six meshes to reach the position q from the position p. However, when the maze wiring control unit 64 of the present embodiment is used, FIG.
As shown in (b), the wave moves from the chord 72 at the position p to the position q
At one time (directly).

Therefore, without using a mesh consisting of rectangles depending on the wiring pattern width, a chord 72 having a basic unit distance between component pins 71 which is considerably larger than the wiring pattern width.
Is a wave propagation target, so that the wiring route of the wiring pattern can be determined in a very short time. Note that FIG.
(B) In FIG. 6 and FIG. 6, the mark “x” on the string 72 is for recording that the wave has passed on the string 72 (the intersection of the wave and the string 72). The wiring route is shown.

Incidentally, the automatic wiring device 60 of the present embodiment
Then, after all the wiring routes of the wiring pattern on the printed wiring board 70 are determined by the maze wiring control unit 64, the wiring pattern passing over the chord 72 is automatically set between the component pins 71 by the equal allocation unit 65. And the absolute position of the finally determined wiring pattern is registered in the database 61.

In the maze method using the mesh described with reference to FIG. 11, when the wiring patterns between the component pins are equally allocated and arranged, for example, as shown in FIG. In the case where the passage of a new wiring route 74 is added in a state where the two wiring routes 73 have already been determined, when the passage of the new wiring route 74 is determined, The position (coordinates) of the wiring route 73 must be changed so that the distance d between the three wiring routes 73 and 74 becomes equal.

On the other hand, in the automatic wiring apparatus 60 of the present embodiment, as described above, the wiring database 62
In, the passing positions of the two wiring routes 73 shown in FIG. 6 between the component pins 71 (on the strings 72) are merely set as relative positions. Therefore, when the passage of the new wiring route 74 is determined, the passing position of the wiring route 74 is set to the lowest position on the chord 72 (the lower wiring route 73 and the lower wiring route 73) by the traffic data insertion unit 68. It is only necessary to store the position in the wiring database 62 as a position relative to the other two wiring routes 73 and to additionally register a new wiring route 74.

That is, when adding a new wiring route 74 between the component pins 71 (on the strings 72), it is not necessary to rewrite the coordinates, and the final wiring route for all the wiring patterns on the printed wiring board 70 is determined. At this stage, the coordinates may be set by the equal allocation unit 65 so that the intervals d between the wiring routes 73 and 74 between the component pins 71 are equal. By equally allocating the wiring pattern intervals between the component pins 71 in this way, the electrical effects of the component pins 71 on the wiring pattern and the electrical effects of the wiring patterns can be minimized. The pattern yield can be improved, and the wiring cost of the wiring pattern on the printed wiring board 70 can be minimized.

Further, in the automatic wiring device 60 of the present embodiment, when a wave is propagated between the adjacent strings 72 by the maze wiring control section 64, the passage possible / non-permissible determining section 66 determines the components forming the strings 72. By determining whether or not a wiring pattern can pass through based on the capacitance between the pins 71, it is possible to prevent an unwiringable number of wiring patterns from passing between the component pins 71 (on the string 72), and to prevent the passage. The determination as to whether or not it is possible can be made in a short time.

Here, for example, as described above with reference to FIG.
When trying to add a new wiring route 74 on the string 72, the maze method using a mesh described with reference to FIG.
When determining whether or not the new wiring pattern can pass between the component pins 71, first, the interval between the new wiring route 74 and the lower component pin 71 is calculated, and the interval is determined so that the new wiring pattern passes through the wiring pattern. If there is not enough space, the position of the two wiring routes 73 already wired is moved upward, and then the distance between the new wiring route 74 and the lower component pin 71 is again increased. Had to be investigated. Further, at this point, if it is determined that there is not enough space to pass the new wiring route 74, an operation such as returning the positions of the two wiring routes 73 moved upward to the original position is necessary. It took a lot of time to find the route.

On the other hand, in the automatic wiring device 60 according to the present embodiment, as described above, in the passability determining unit 66, a wiring pattern (a new pattern) is passed by the addition unit 66A on the string 72 by propagation of the current wave. The total width of the line width of the wiring route 74) and the line width of the wiring pattern (two wiring routes 73) permitted to pass on the string 72 up to this time is calculated, and the comparison unit 66B calculates the total width and the string. The distance (known) between the component pins 71 forming 72 is compared with the inequality [distance between component pins 71]> [wiring pattern 7
By simply examining whether or not the sum of the line widths of 3, 73 is satisfied, it is possible to determine whether or not the new wiring route 74 can pass, and the width exceeding the distance between the component pins 71 (the length of the chord 72). Therefore, it is possible to search for the wiring route in a very short time.

As described above with reference to FIG. 6, when a new wiring route 74 is inserted and passed through on the chord 72 between the component pins 71 with two wiring routes 73 already determined. In the maze method using a mesh described with reference to FIG. 11, the position of the wiring route 73 of the existing wiring pattern from the upper component pin 71 must be determined in consideration of its own line width. In general, when searching for a wiring route, a new wiring route 74 searched here is not always adopted as it is, because a trial and error method is employed. It was necessary to restore the position of the pattern.

On the other hand, in the automatic wiring device 60 according to the present embodiment, as described above, in the wiring database 62, the two wiring routes 73 shown in FIG. The position is merely set as a relative position, and when a new wiring route 74 is adopted, the traffic data insertion unit 68 causes the lower wiring route 73 to be located between the lower component pins 71. New wiring route 7
It is only necessary to register the existence of 4 in a relative position,
The actual position (absolute position) may be calculated only once by the equal allocation unit 65 in the final stage.

When the new wiring route 74 is rejected, the wiring database 62
It is only necessary to state that the wiring route 74 no longer exists between the lower wiring route 73 and the lower component pin 71. Therefore, the position of the existing wiring route 73 is not affected at all, and as described above, the search for the wiring route can be performed in a very short time.

Further, in the automatic wiring device 60 of the present embodiment, the passing positions of the plurality of wiring patterns on the strings 72 are stored as relative positions in the wiring database 62 as described above, for example, as shown in FIG. As described above, when the wiring routes 73 and 74 of at least two wiring patterns pass on the chord 72 at the adjacent positions p and q, the maze wiring control unit 64
, Based on the relative positions of the wiring routes 73 and 74 on the two strings 72 at the positions p and q, respectively.
The intersection between the wiring routes 73 and 74 can be easily determined without performing any complicated operation or the like.

Here, as shown in FIG. 7, in a state where the wiring route 73 passing through the positions P1 and P4 on the chords 72 at the positions p and q has already been determined, on the chords 72 at the positions p and q. When adding a new wiring route 74 passing through the positions Q1 and Q2, in the maze method using the mesh described with reference to FIG. 11, whether the new wiring route 74 intersects another existing wiring pattern 73 or not. In order to check whether or not the wiring pattern of the wiring route 73 that reaches the positions P1 to P2, P2 to P3, and P3 to P4 is found from among many wiring patterns existing on the printed wiring board 70, After confirming that the line is present, it is determined that the line connecting the positions Q1 and Q2 intersects the existing wiring pattern 73, and it is determined that there is no wiring route 74 from the position Q1 to the position Q2 between the positions p and q. Judgment To have.

On the other hand, in the automatic wiring apparatus 60 of the present embodiment, the existing wiring route 73 from the position P1 to the position P4 and a new wiring route from the position Q1 to the position Q2 are determined by the above-mentioned intersection determining unit 67. 74 intersects with the following 2
Points are clearly determined. The position P1 exists above the position Q1 on the chord 72 at the position p.

The existing wiring route 73 is continuous from the position P1 on the string 72 to a position P4 below the position Q2 on the string 72 at the position q. Therefore, in FIG. 7, in order for the new wiring route 74 to reach the position Q2 on the chord 72 at the position q from the position Q1 on the chord 72 at the position p, the existing wiring route 73 from the position P1 to P4 is required. Can be determined immediately, and the search time for the wiring route can be reduced.

On the other hand, in the line search method described with reference to FIG. 10, actually, as shown in FIG.
1 to 84 are represented by straight lines called segments. further,
To efficiently access this straight line, the printed wiring board 7
0 is divided into vertical or horizontal bands to set links. A pattern parallel to the divided bands (referred to as a pattern in the main wiring direction) such as the wiring patterns 81 to 83 does not matter, but a pattern perpendicular to the divided bands (a pattern in the sub wiring direction) like the wiring pattern 84. (Referred to as “pattern”), it is necessary to divide the segment, and once the main wiring direction is determined for a certain layer, it is no longer possible to efficiently represent a pattern in a direction perpendicular to the main wiring direction. That is, the pattern in the sub wiring direction must be represented by being divided into a number of segments.

On the other hand, in the automatic wiring device 60 according to the present embodiment, as shown in FIGS. 8 and 9B, since the region is not divided into strips, the main wiring direction and the sub wiring direction are distinguished. This makes it possible to express the wiring pattern (wiring route 73) without having to distinguish between the horizontal and vertical directions, and to search for the wiring route. As described above, according to the embodiment of the present invention, the search time of the wiring route can be greatly reduced, so that the number of searches within a certain time is also greatly increased, and an extremely high-density automatic wiring is realized. You can do it.

In each of the embodiments described above, the case where the automatic wiring and the automatic arrangement are performed on the printed wiring board has been described. However, the present invention is not limited to this, and the semiconductor (LSI), the multi-chip Module (MC
M) and the like can be applied at the time of designing, and in this case, the same operation and effect as the above embodiment can be obtained.

[0057]

As described above in detail, the automatic wiring of the present invention
According to equipment, drawn between adjacent component pins straight line is defined as a string, the position information of the chord is created based on the position information of the component pin, wire control by the maze method intended for such strings Can determine the wiring route of the wiring pattern, so that the wiring route of the wiring pattern can be determined in a short time, the number of searches within a certain period of time greatly increases, and extremely high-density automatic wiring There is an effect that can be realized.

Further, when a wave for maze wiring is propagated between adjacent strings, it is determined whether or not the wiring pattern can pass through based on the capacity between the component pins forming the strings, thereby making it possible to determine whether or not the wiring pattern can pass. In addition to this, it is possible to prevent an unwiringable number of wiring patterns from passing therethrough, and it is possible to determine whether or not the wiring pattern can pass in an extremely short time, thereby obtaining an effect of contributing to further high-density automatic wiring.

In this case, the total width of the line width of the wiring pattern that is allowed to pass on the string by the propagation of the current wave and the line width of the wiring pattern that has been allowed to pass on the string so far is calculated. Only by comparing the total width and the length of the string, it is possible to determine whether or not the wiring pattern can pass, and the determination as to whether or not the wiring pattern can pass is simplified, which greatly contributes to shortening the search time of the wiring route.

Further, when a plurality of wiring patterns pass on the string, the passing position of each wiring pattern on the string is stored as a relative position on the string, so that the wiring that has already been allowed to pass is stored. Since the position of the pattern can be treated as a relative position on the chord, the position of the existing wiring pattern can be easily moved when a new wiring pattern is allowed to pass between component pins, etc. The pattern can be easily inserted, and the search for the wiring route can be performed in a very short time.

When at least two wiring patterns pass on adjacent strings, based on the relative position of each wiring pattern on the adjacent strings, no complicated calculation is performed at all, and the wiring pattern You can easily determine the intersection,
When the passage of the new wiring route is determined during the course of the maze wiring process, the passage position of the new wiring route is stored as a relative position to the existing wiring route, and the new wiring route is stored. It is only necessary to perform additional registration, and at the final stage where all the wiring routes on the wiring board are determined, the wiring pattern passing over the strings is automatically wired evenly between the component pins and the absolute position is calculated -By determining, the search time of the wiring route can be further reduced.

[Brief description of the drawings]

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

FIG. 2 is a principle block diagram of the present invention.

FIG. 3 is a block diagram showing an automatic wiring device as one embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the present embodiment.

FIGS. 5A and 5B are diagrams for explaining the operation of the present embodiment.

FIG. 6 is a diagram for explaining the operation of the present embodiment.

FIG. 7 is a diagram for explaining the operation of the present embodiment.

FIG. 8 is a diagram for explaining the operation of the present embodiment.

FIGS. 9A and 9B are diagrams for explaining the operation of the present embodiment.

FIG. 10 is a diagram for explaining a general line search method.

FIG. 11 is a diagram for explaining a general maze method using a mesh.

[Explanation of symbols]

12 Wiring board 13 Component Pin 13A Starting point (component pin) 13B End point (part pin) 14 strings 15 Wiring route 20 Automatic wiring device 21 String information creation means 22 Maze wiring control means 60 Automatic wiring device 61 Database 62 Wiring Database 63 String information creation unit 64 Maze wiring controller 65 Equal allocation part 66 Passability determination unit 66A adder 66B Comparison section 66C judgment unit 67 intersection judgment unit 68 Traffic Data Insertion Unit 70 Printed wiring board 71 Component Pin 71A Starting point (component pin) 71B End point (component pin) 72 strings 73, 74 Wiring route

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazufumi Iwahara 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Mitsunobu Okano 4-chome, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa 1-1 1-1 Fujitsu Co., Ltd. (72) Inventor Hiroyuki Orihara 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Fujitsu Co., Ltd. (72) Inventor Akira Katsumata 4-chome, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa 1-1 1-1 Fujitsu Limited (72) Inventor Toshiyasu Sakata 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Fujitsu Limited (72) Inventor Masaharu Nishimura 4-chome Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa 1-1 No.1 Fujitsu Limited (72) Inventor Hiroshi Hamamura 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Stock In-house (72) Inventor Naoki Murakami 4-1-1 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside (72) Inventor Mitsuru Yasuda 4-1-1 Kamedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (72) Inventor Hirohiro Yamashita 4-1-1 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Co., Ltd. (72) Inventor Ryoji Yamada 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Stock In-house (56) References Toru Awashima and four others, implementation of sequential wiring method based on rubber band model, IEICE technical report, IEICE technical report, May 29, 1992, Vol. 92, No. 65 (VLD92-39), p. 25-30 Hiroshi Tanaka, 4 others, Multi-layer wiring system based on sketch expression, IPSJ research report, IPSJ, February 4, 1994, Vol. 94, no. 15 (DA-70), p. 63-70 Ying, C.I. et al. , Automated pin grid array package routing on multilayer ceramic substrates, Trans. VLSI Systems, IEEE, December 1993, Vol. 1, p. 571-575 Staepelaere, D.C. et al. , SURF: rubber-band routing system for multichip modules, Design & Test of Computers, IEEE E, December 1993, Vol. 10, p. 18-26 Darnauer, J .; et al. , Fast pad redist ribtion from peri phery-IO to area-IO, Proc. MCM-94, IEEE, March 17, 1994, p. 38-43 (58) Field surveyed (Int. Cl. ⁷ , DB name) G06F 17/50 658

Claims (5)

(57) [Claims] 1. An automatic wiring apparatus for determining a wiring route of a wiring pattern for automatically wiring a wiring pattern on a wiring board having a large number of component pins, comprising: String information generating means for generating position information of a string as a connected straight line based on the position information of the component pin; and generating a wave of a maze wiring from a start point to an end point of the wiring route; The wave is propagated between the adjacent strings based on the information on the strings created by the creating unit, and the positions of the strings that the wave has passed from the start point to the end point are sequentially stored, When the wave reaches the said end point, and reversing the position of the string passing through the said corrugated toward the above start point from said end point, a maze routing controlled means for determining the wiring route of the wiring pattern, labyrinth wire control means Between the adjacent strings
When propagating, it is based on the capacitance between the component pins of the string.
Pass / fail judgment to determine whether or not the wiring pattern can pass
Characterized that you a constant means is provided, the automatic wiring device. 2. The system according to claim 1, wherein said pass / fail judgment means calculates a total of a line width of a wiring pattern which is passed over said string by propagation of said wave and a line width of a wiring pattern which is allowed to pass through said string so far. Adding means for calculating the total width; comparing means for comparing the total total width calculated by the adding means with the distance between the component pins forming the chord; as a result of the comparison by the comparing means, also wherein when towards the total total width is small, characterized in that it is composed of a judging means for permitting the passage of the wiring pattern, an automatic wiring apparatus according to claim 1. 3. When the plurality of wiring patterns are allowed to pass over the string by the passage availability determination means, a passing position of each wiring pattern on the string is stored as a relative position on the string. The automatic wiring device according to claim 1 or 2 , wherein: 4. An intersection judging means for judging the intersection of wiring patterns based on a relative position of each wiring pattern on the adjacent string when at least two wiring patterns pass on the adjacent string. The automatic wiring device according to claim 3 , wherein the automatic wiring device is provided. 5. An equalizing means for equally arranging the wiring pattern passing over the chord between the component pins after all the wiring routes of the wiring pattern on the wiring board are determined by the maze wiring control means. wherein the is provided an automatic wiring apparatus according to claim 3 or claim 4.