JPH04677A - Method and system for wiring assigned wiring length - Google Patents

Abstract

PURPOSE:To attain route determination with arbitrary assigned wiring length by giving a means to determine a searching line for setting a relay point to a position so that the sum of the distance between a starting point and the relay point and the distance between the relay point and an end point may be the assigned wiring length neither too much nor too little. CONSTITUTION:The assigned wiring length of a section (S,E) is found while using the total 4 layers of the (x) direction, (y) direction, oblique +45 deg. direction and oblique -45 deg. direction wiring layers simultaneously regradless of the size relation of assigned wiring length L and Manhattan distance. After setting a relay point T so as to satisfy delta (S,T)+delta (T,E)=L to the wiring object section (S,E) in advance, the shortest wiring route searching is executed with a labyrinth method, a segment searching method, etc., by using the (x) and (y) direction and oblique + or -45 deg. direction wiring layers simultaneously to the plural sections (S,T) and (T,E) divided by the relay point T and a wiring route is determined. The delta (S,T) and the delta (T,E) mean the minimum distance able to be realized by using the above-mentioned 4 wiring layers to the sections (S,T) and (T,E) repectively. Thus, the route can be determined by the arbitrary assigned wiring length.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method and system for automatically determining wiring patterns of printed circuit boards, integrated circuits, etc. using a computer.
In particular, the present invention relates to a wire length designation wiring method and a wire length designation wiring system suitable for automatically determining a wiring pattern for a desired signal with a designated wire length in consideration of signal delay and circuit operating characteristics.

[Conventional technology]

For printed circuit boards, integrated circuits, etc., a method of determining a wiring route with a specified wiring length for a desired wiring section by considering signal delay and circuit operating characteristics is disclosed in, for example, Japanese Patent Laid-Open No. 59-29247. There is a technique described.

When a desired wiring section is given as (S, E) and a wiring route is required to be determined with a specified wiring length,
The actual wiring path length ρ(S).

For E), the following conditions are generally imposed:

L-ΔL≦Q(S,E)≦L+ΔL...(1
) However, in equation (1), ΔL is an allowable error.

The conventional wiring route determination method that satisfies the condition of equation (1) is to route a given wiring section in the horizontal direction (X
In this method, a wiring route is determined by searching for a wiring route using two layers in which a wiring layer in the direction (direction) and a wiring layer in the vertical direction (y direction) are paired.

The wiring method according to the prior art will be explained below with reference to the drawings.

FIGS. 9 to 11 are diagrams for explaining a method of determining a wiring route according to the prior art.

In the conventional wiring route determination method, as shown in Fig. 9, relay points T are determined in advance for the wiring target section (S, E) as follows: d(s, T) + d(T, E) = L...
After setting to satisfy (2), as shown in Fig. 10, a plurality of sections (S, T
), (T, E), the wiring routes were determined using the maze method, line segment search method, etc., respectively. However, in equation (2), d(S,T), d(T.

E) are X for the intervals (S, T) and (T, E), respectively.
direction, meaning the shortest distance using the Y direction, ie, the Manhattan distance.

FIG. 11 shows an example of a method for setting the relay point T that satisfies equation (2). In setting the relay point T, first, the X-direction axis passing through the point S, and the straight line nx parallel to the X-direction axis
1+Q'/x, X direction axis passing through point E, straight line Ωx2 parallel to the X direction axis. After finding Qyz, QXL, Qx
z, Qyty The relay point setting search lines Tx1°Txz, Tyl, Tyz, which are each at a distance dQ from Qyz,
Area RX1. RxztRyt is determined as internal to Ryz. Here, the distance dQ is calculated using the distance Lx in the X direction and the distance Ly in the y direction between the two points (S, E), dQ=(L-(Lx+Ly))/2-(3
) can be obtained as Also, the area Rx 1°Rx
Regarding zg R'/11 R'j 2, for example, the region RX1 can be easily determined as the common region of the region on the opposite side of the point E with respect to the straight line Ωx1 and the band-shaped region sandwiched between the two straight lines 1iAQy1pQyx. The relay point T is
It can be set by selecting from unused lattice points that are on these search lines TXI, TX21 TyttTyz and can be wired.

In this way, a relay point T that satisfies equation (2) is set, and the section (S, T) is divided by the relay point.

By searching for the shortest wiring route (T, E), it is possible to realize a wiring route length that is just the right length for the specified wiring length.

[Problem to be solved by the invention]

However, in the prior art, the wiring route search is performed using only the horizontal wiring layer and the vertical wiring layer, so the length of the wiring that can be specified is limited to the wiring target section (S).

It is impossible to determine a wiring route for a wiring section with severe signal delay conditions, where it is necessary to specify a wiring length that must be larger than the Manhattan distance in E) and shorter than the Manhattan distance of the wiring target section. I had a problem with that.

The purpose of the present invention is to solve the problems of the prior art described above,
Determine wiring routes for printed circuit boards, integrated circuits, etc.
It is an object of the present invention to provide a wire length designated wiring method and a wire length designated wiring system that make it possible to determine a route with an arbitrary designated wire length in consideration of signal delay and circuit operation characteristics.

[Means to solve the problem]

According to the present invention, the above object is achieved by the following means.

(a) In addition to horizontal and vertical wiring layers, at least three wiring layers having diagonal wiring layers are simultaneously used as wiring target layers, and the shortest wiring route can be found using the maze method, line segment search method, etc. A wiring pattern determination system is used.

(b) Set the relay point T for the wiring target section (S, E), and set the distance between the two points (S, T) and the distance between the two points (T, E) to at least three layers including the diagonal wiring layer. This is carried out by a method of calculating the minimum distance that can be achieved by using the above wiring layer as a wiring target layer.

The above explanation will be supplemented below using FIGS. 3 to 8. 3 to 8 show at least three diagonal wiring layers.
In a wiring pattern determination system that simultaneously determines more than one wiring layer as a wiring target layer, as an example of a wiring route determination process according to the present invention, a wiring target section (
The wiring route determination process for S and E) is performed simultaneously using a total of four layers: a horizontal (X direction) wiring layer, a vertical (X direction) wiring layer, a diagonal +45° wiring layer, and a diagonal -45° wiring layer. However, regardless of the magnitude relationship between the specified wiring length and the Manhattan distance, the wiring route length Q (S, E) of the section (S, E)
) is executed so as to satisfy the constraint shown in equation (1) above.

In this example, as shown in Figure 3, the wiring target section (S, E)
, the relay point T is set in advance by δ(S, T) + δ(T, E
)=L...After setting so as to satisfy (4), as shown in FIG. 4, a plurality of sections (S.

T), (T, E) x, X direction and oblique ±45°
Using the directional wiring layer at the same time, the shortest wiring route is searched by the maze method, line segment search method, etc., and the wiring route is determined. However, in equation (4), δ(S, T), δ(T, E
) are the intervals (S, T), respectively.

It means the minimum distance that can be realized using the above four wiring layers for (T, E).

Next, a method of setting such a relay point will be explained.

As shown in Fig. 5, in this example, there are four different relationships between the distance Lx in the X direction and the distance Ly in the y direction between two points (S, E), and the specified wiring length for each of them. Accordingly, a total of 12 relay point settings are made, 3 ways. Of these, in Figures 6, 7, and 8, L x > L y
...(5) L x < (Jr +
1)*L y This shows a setting method when the relationship (6) is satisfied. Here, the relationship in equation (6) is the minimum distance (Manhattan distance, which is given by Lx + Ly) that connects (S, E) that can be realized using only the X-direction wiring layer and the X-direction wiring layer. But diagonal +4
The minimum distance (in this case, l
−L (given by x). Of these, the designated wiring lengths in Figures 6, 7, and 8 are L < J "* L x ... (7) 1 *
LX≦L<Lx+Ly −(8)L≧Lx+
Ly... shows a setting method when the relationship (9) is satisfied.

This will be explained below.

FIG. 6 shows a setting method when the designated wiring length satisfies equation (7). When setting the relay point, first set the X-direction axis that passes through point S, and the X-direction axis.

4 straight lines Q X parallel to +45° axis and -45° axis
l, Q yx, mX1* myl, 4 straight lines QX 2+ Q y2t rn
After finding 9m3'□, m3/1. distance d from my2
Search line for relay point setting at m, Tmx, Tmz+Q
xt, Q Regions Rmt, R in which the search lines for relay point setting TQ1°TQ2 located at a distance dQ from x2 are shown in the figure, respectively.
rr+z.

It is determined that it is inside RQl and RQ2. Here the distance dm
, clQ can be calculated using the following formula. The relay point T can be set by selecting from among the unused grid points that are on these search lines for relay point setting and can be wired.

FIG. 7 shows a setting method when the designated wiring length satisfies equation (8). In this case, the basic processing is the same as the method shown in FIG.

A straight line rn/l passing through point E and parallel to the 145° axis.

The method for determining the search lines T m 1 and T m z for relay point setting, which are located at a distance dm from myz, is exactly the same as the method shown in Fig. 6, and the calculation of the distance 4Id m is as follows (10)
This can be done by formula. However, the distance d from the straight line Ωxx, Qx2, which passes through point S9 and point E, is parallel to the X direction axis.
Search line TΩ1 for relay point setting at Q. TQz is determined as being inside the region RQ1°RQ2, which is relatively different from the case of FIG. Furthermore, in this case, the distance dQ is calculated as dQ=cL ((AJ/T I)*Lx+Ly)]/
2... Perform according to (12).

FIG. 8 shows a setting method when the specified wiring length satisfies equation (9). This case is also the same as the above two cases, but the difference from the case shown in FIG. 7 is that point S9 and point E
A straight line m Y 1 + parallel to the -45° axis passing through
This is a method for determining search lines Tm and Tmz for setting relay points, which are located at a distance of 1idm from m'l2. In this case, the search lines Tmx and Tmz are determined in a region Rmx that is relatively different from the case of FIG.

This is done as the inside of Rm x. Furthermore, in this case, the calculation of the distance dm is dm=[L-(Lx (J薯2-1)Ly)]/2
...Perform according to (■3).

Although the method for setting relay points in the case where the relationships of equations (5) and (6) are satisfied has been described above, relay points can be similarly set in cases other than this.

[Effect]

In the wiring length specified wiring method using the above method, horizontal direction,
In addition to the vertical wiring layer, at least three wiring layers including diagonal wiring layers are simultaneously set as the wiring target layer, and regarding the setting of relay points for the wiring target section, between the starting point and the relay point of the section, and The distance between the relay point and the end point of the section is
At least three or more wiring layers including the diagonal wiring layer are defined as the minimum distance that can be realized as a wiring target layer. According to the definition, in the wiring length specified wiring method using the above means, the search line for relay point setting is
It provides a means for determining a position such that the sum of the distance between the starting point and the relay point and the distance between the relay point and the end point is the specified wiring length, so as a result, route determination using any specified wiring length is possible. It becomes possible.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 and 2, supplemented by detailed explanations of the present invention shown in FIGS. 3 to 8 described above.

FIG. 1 is a flowchart illustrating a method according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a processing system that executes the method according to an embodiment of the present invention.

A wiring method according to an embodiment of the present invention is executed by a processing system as shown in FIG. 2 according to a flowchart shown in FIG. As shown in FIG. 2, a processing system for carrying out the method of the present invention includes a computer 201 that performs automatic wiring processing according to the flowchart shown in FIG. 1 and controls the entire system, and wiring for printed circuit boards, integrated circuits, etc. A mounting system information file 202 that defines layer configurations, wiring directions in each wiring layer, etc., and a net information file 2 that stores wiring target sections, wiring conditions for the sections, etc.
03, a pattern information storage file 204 that stores wiring pattern information, a console display device 205 used to provide parameters such as file names to be input and output to the automatic wiring process executed in the computer 201, and an automatic wiring system. The list output device 206 outputs various information such as unwired information and statistical information after execution.

A specific example of the wiring method using the processing system configured as described above is shown in the flowchart of FIG.

The present invention will be explained below, supplemented by detailed illustrations of the present invention shown in FIGS. 3 to 8 mentioned above.

First, the wiring target section (S, E), specified wiring length, and its tolerance ΔL are input from the net information storage file 203, and the configuration of wiring layers, wiring direction in each wiring layer, etc. are input from the mounting system information file 202. Then, the wiring pattern of the wiring layer is input from the pattern information storage file 204, and the environment necessary for wiring processing is set (101). Next is the X direction wiring layer.

y direction wiring layer, diagonal +45° direction wiring layer, diagonal -45°
2 points S that can be realized by simultaneously using a total of 4 layers of directional wiring layers,
The minimum distance δ(S, E) connecting E is calculated (102).

Here, the minimum distance δ(S, E) is compared with the designated wiring length (103), and if L−ΔL<δ(S,E)<L
+ΔL...If (14) is satisfied, after executing the shortest wiring route search for the wiring target section (S, E) (104), the wiring pattern determined by the wiring route search is stored in the pattern information storage file 204. Output (
109), the process ends.

Or, if formula 14) is not satisfied, the above minimum distance δ
(S, E) and the specified wiring length are compared again (105
), if δ(S, E)≦L−ΔL...(15
), then the relay point T for the wiring target section (S, E) is defined as the minimum distance δ(S, T), δ(T, E) connecting the two points S, T and the two points T, E. ), δ(S,T)+δ(T,E)=L...
Set so that (16) is satisfied (106. See Figure 3).

In detail, such a relay point T can be set by the method shown in FIGS. 5 to 8. First, as shown in FIG. 5, after calculating the distance Lx in the X direction and the distance Ly in the y direction with respect to the two points S and E, Lx.

A search is made to determine which case in the diagram the relationship between Ly and L corresponds to. Next, depending on the case, a search line Tm construction, Tmz + T, which can set relay points as shown in FIGS.
Determine Qr and TD2. Here, Figures 6, 7, and 8
Each figure shows a method for determining the search line corresponding to cases (2), (2), and (2) in FIG. 5, respectively. Finally, by selecting an unused lattice point that can be wired from among the lattice points on the search line where the relay point can be set, it is possible to find the relay point T that satisfies the equation (16).

Step 107
, 108 (see FIG. 4), the wiring pattern determined by the wiring route search is output to the pattern information storage file 204 (109).
), the process ends.

On the other hand, in judgment 105, if formula (15) is not satisfied, the relationship between the minimum distance δ(S, E) and the specified wiring length is δ(S, E)>L+ΔL (17
), and since it is physically impossible to discover such a wiring route, the process is immediately terminated.

An embodiment of the wiring length specified wiring method according to the present invention has been described above. According to this embodiment, the starting point position of the wiring target section,
Setting relay points and searching wiring routes for at least three or more wiring layers, including diagonal wiring layers, according to the relationship between the distance in the X direction, the distance in the y direction, and the specified wiring length between end point positions.
This is possible regardless of the size of the Manhattan distance of the wiring target section, and as long as the wiring route can be physically discovered, the wiring pattern can be determined with any specified wiring length.

〔Effect of the invention〕

According to the present invention, it is possible to automatically determine a wiring pattern with an arbitrary wiring length, regardless of the magnitude of the Manhattan distance of the wiring target section and the specified wiring length, and to accurately determine signal delays and circuit operating characteristics. This has the effect of making it possible to take wiring design into consideration.

[Brief explanation of the drawing]

FIG. 1 is a flowchart explaining a method according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a processing system that executes a method according to an embodiment of the present invention, and FIGS. Figures 9 to 1 for explaining the method of one embodiment of the invention.
FIG. 1 is a diagram illustrating a method for determining a wiring route according to the prior art. S...Start point of the wiring target section, E...End point of the wiring target section, T...Relay point, V1 t V2 t...
... Via (relay hole), px, pyl Pas・= wiring route, T Q xt T fl SrTmz, Tmz,
Txt, Txz, Tyt, Tyz°°° relay point setting search line, RQl, RQz, Rml, Rmz. RXl, RX2. Ryx, Ryz - area where determination of search line for relay point setting is permitted.

Claims (1)

[Claims] 1. Wiring length specification that simultaneously determines a wiring pattern that takes into account signal delay time constraints in printed circuit boards, integrated circuits, etc., with at least three wiring layers including diagonal wiring layers as wiring target layers. A wiring method for specifying a wiring length, characterized in that the wiring method includes the following wiring route determination procedures (a) to (e). (a) For the wiring target section for which the wiring route is to be determined, input the starting point position, end point position, and upper and lower limits of the permissible wiring route length range for the wiring target section, and proceed in step (b). ). (b) Calculate the minimum distance that can be realized using the wiring target layer connecting the starting point position and the ending point position, and proceed to step (c)
Execute. (c) Compare the minimum distance connecting the starting point position and the ending point position with the wiring route length tolerance range, and if the minimum distance is within the wiring route length tolerance range, the shortest distance from the starting point position to the ending point position. After performing the wiring route search, the wiring route determination procedure ends. (d) The sum of the minimum distance on the wiring target layer connecting the relay point between the start point position and the relay point position and the minimum distance on the wiring target layer connecting the relay point position and the end point position is , the wiring path length is set to be within the permissible range, and procedure (e) is executed. (e) After searching for the shortest wiring route from the starting point position to the relay point position and searching for the shortest wiring route from the relay point position to the end point position, the wiring route determination procedure is ended. 2. In a wiring length specified wiring system in which a wiring pattern that takes into account signal delay time constraints in printed circuit boards, integrated circuits, etc., at least three wiring layers including diagonal wiring layers are simultaneously determined as wiring target layers, (a ) Means for inputting, for a wiring target section for which a wiring route is to be determined, the starting point position and end point position of the wiring target section, and the upper and lower limit values of the permissible wiring route length range for the wiring target section; (b) the above; means for calculating the minimum distance connecting the starting point position and the ending point position that can be realized using the wiring target layer; (c) comparing the minimum distance connecting the starting point position and the ending point position with the wiring route length tolerance range; means, (d) a relay point;
The sum of the minimum distance on the wiring target layer connecting the starting point position and the relay point position and the minimum distance on the wiring target layer connecting the relay point position and the end point position is the allowable wiring route length. (e) means for searching for the shortest wiring route from the starting point position to the relay point position and searching for the shortest wiring route from the relay point position to the end point position; A wire length specified wiring system characterized by having: