JPH02222071A - Method and device for wiring of printed board - Google Patents

Abstract

PURPOSE:To simply and beautifully execute a wiring job of a power line by adding a means to a wiring method for connection between a signal line and a power line to decide an angle formed between a virtual straight line extending in the (x) and (y) directions and parallel to an external form line of a printed board and the side line to be drawn via the power line. CONSTITUTION:When a power line 42 of a signal line 41 of a printed board is drawn by an automatic wiring device, the coordinates of center points A and B of the width and the width C are designated to increase the width of the line 42. Then it is decided whether an angle theta formed between a virtual straight line 43 extending toward and (x) axis and a side line 44 to be drawn via the line 42 is smaller than a minute angle (10 deg.) set previously or not. If so, the line 44 is forcibly and automatically connected to the side edge of the line 41 so that the line 44 of the line 42 is put on the line 43. In the same way, a virtual straight line extending toward a (x) axis and a virtual straight line parallel to the external form line of a printed board are decided and drawn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiring method and a wiring device for printed circuit boards such as analog printed circuit boards, digital printed circuit boards, flexible printed circuit boards, and hybrid printed circuit boards. The present invention relates to a wiring method and a wiring device.

[Prior art]

As various electronic devices develop and become more sophisticated and multi-functional, the circuit configurations of the various printed circuit boards used in these devices tend to become more complex and multilayered.

In order to cope with this problem, automatic wiring of printed circuit boards has been proposed using various wiring methods such as the maze method and the line segment search method. However, in reality, part of the wiring is often changed after automatic wiring. Currently, the wiring is changed manually one by one by an operator while looking at a complicated wiring diagram displayed on a graphic display.

[Problem to be solved by the invention]

In particular, when connecting a power line that is routed by another program to one end of a signal line, even if you try to draw the power line on the same straight line as the signal line, there is usually a fine grid on the display screen for drawing the line. Because there are no wires, the power supply wires are bent at a slight angle relative to the signal wires, which often results in poor wiring results.

In addition, in order to prevent this from happening, the wiring must be redone many times to make it straight, which makes the work for the operator extremely demanding both physically and mentally. Not only that, but it also has drawbacks such as very poor work efficiency.

Further, particularly in the case of a dual in-line type IC package, not only the number and types of IC elements mounted on the printed circuit board are large, but also the orientations of the IC elements on the printed circuit board vary.

Therefore, it has the disadvantage that it takes a long time to draw the power supply line, and the work efficiency is very low.

An object of the present invention is to provide a printed circuit board wiring method and wiring device that eliminates the drawbacks of the prior art as described above, automatically cleans the wiring, improves the efficiency of wiring work, and shortens design time. There is something to do.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a printed circuit board wiring method for connecting a signal line and a power supply line, which includes: a virtual straight line extending in the X direction, a virtual straight line extending in the Y axis direction,
Alternatively, the angle between one of the virtual straight lines extending parallel to the outline of the printed circuit board and the side edge of the power supply line to be drawn may be a small preset angle of, for example, about 10 degrees. It is characterized in that it is determined whether the power supply line is small or not, and if it is determined that the power supply line is small, the side edge of the power supply line is drawn on the virtual straight line.

Furthermore, in order to achieve the above-mentioned object, the present invention provides a plurality of branch line extension patterns in which the power supply branch line extension patterns for the ICi element are different from each other and each pattern code is assigned separately.

Power supply and ground pin number data organized by IC element type.

a storage means for storing in advance, as a database, each pin position of an IC element as x, y coordinate data with respect to the center position of the IC element, and pin position data organized by type of IC element; and data on the extension of the plurality of branch lines. selection means for selecting an appropriate stretching pattern from among;
input means for inputting the type of IC element, the rotation angle of the IC element to be arranged with respect to a predetermined reference direction with the center position of the IC element as the rotation center, the length of the power supply branch line, and the width of the power supply branch line; At least a wire drawing means for automatically drawing a power supply branch line around an IC element to be wired based on a selection signal from the selection means, an input signal from the input means, and the database stored in the storage means. It is characterized by the presence of

〔Example〕

Next, a printed circuit board wiring method and a wiring device according to an embodiment of the present invention will be explained using the drawings.

FIG. 1 is a block diagram for explaining the basic system configuration of an automatic wiring device according to an embodiment, FIG. 2 is a flowchart for explaining the processing operation of the automatic wiring device, and FIG. 3 is an example of a printed circuit board. A circuit diagram, FIG. 4 is a wiring diagram of a printed circuit board formed based on the circuit diagram, FIG. 5 is a diagram for explaining a specific example of automatic wiring, and FIGS.
Figure 1 is a diagram for explaining an example of changing the wiring, and Figures 12 and 13 are diagrams for explaining a connection method in which one side edge of the signal line and one side edge of the power line are connected in a straight line. , FIGS. 14 to 22 are diagrams for explaining automatic wiring of power supply branch lines around an IC element.

First, the overall basic configuration of the CAD/CAM system will be explained using FIG. As shown in the figure, this system is broadly divided into a central processing unit 1, a storage device 2 consisting of a magnetic disk device, an optical disk device, etc.
, an NG tape creating device 3, an automatic drawing machine 4, and work stations 5a and 5b. In this embodiment, the workstation 5a is permanently installed and the workstation 5b is for expansion.

Specifically, the NC tape making device 3 is comprised of a keyboard 6, a printer 7, a paper tape puncher 8, and the like. Further, the workstation 5 specifically includes a system console 9, a color graphic display 1O, a digitizer 11, and a command key 1.
It is composed of 2 etc. The connection relationship of each device is as shown in the figure.

Next, the processing flow of the DigiMole circuit CAD system will be explained using FIG. First, step (hereinafter, S
It is abbreviated as ) In 1, the entire logic circuit diagram to be designed is created.In order to realize this logic circuit by dividing it onto multiple printed circuit boards, logic division is performed in S2, and based on this, in S3. A partial logic circuit diagram is created for each printed circuit board.

Next, in step 84, if the logic circuit is described at the gate level, gate assignment is performed to assign these to the corresponding IC chip, and then in step S5, the gate-assigned IC chip (package) is placed on the printed circuit board. Place and fix. Since this component placement greatly affects the ease of later wiring design, interactive layout planning is performed using a graphic display.

At the gate allocation stage described above, the relative positional relationship of the IC chips (packages) has not been determined, so the gate allocation within one component is not determined. The gate position within the IC chip (package) is determined and pin assignment within the IC chip (package) is performed (36).

Next, in 87, wiring design is performed. Since the detailed operation will be explained later, the explanation of the wiring operation will be omitted here. As far as automatic wiring designs are concerned, there are almost no wiring errors.

When wiring is corrected (changed) using a graphic display after automatic wiring is done manually, there is a possibility of mistakes being made. Therefore, in S8.

For example, inspection for short circuits and open faults between wires, and checking the spacing between patterns are performed. Finally, in S-9, artwork data is created.

Logical information is extracted from this and matched with input logical information.

Next, a specific example of the automatic wiring method will be described.

FIG. 3 is an example of a circuit diagram of a printed circuit board to which wiring is to be performed. In this figure, CNI and CN2 are connectors,
IC1, IC2, and ANDI are IC chips, and small Arabic numerals placed around each electronic component indicate the pin number of each element.

Based on the circuit diagram drawn on this paper, create the following wiring information.

r CNI (1) = IC1 (1) CNI
(2) = IC2 (2) CNI (3) = AND1 (2) ICI (t
1) = IC2 (1) ICI (10) = AND1 (1) ANDI
(3) = IC2 (3) IC2 (11) = CN2 (1) JThe wiring information obtained in this way is input to an automatic wiring device for printed circuit boards, and this wiring device uses the wiring information to Wire using the above wiring layers. Note that wiring between layers is connected using through holes to avoid short circuits.

Based on the above wiring information, create a wiring diagram as shown in Figure 4. 1 In the diagram, the 0 marks indicate the pin positions of each element, the - marks indicate the through-hole positions, and the solid lines indicate the front side wiring. .

The dotted line indicates the back side wiring, CN1. IC1 etc. indicate the name of the electronic component to be placed, and the rectangular portion indicates the position of the electronic component. This wiring diagram is drawn on a photosensitive film in actual size or variable magnification to obtain a visualized wiring diagram of the printed circuit board.

When creating a wiring diagram based on the above wiring information.

Decide the direction in which the wiring will proceed, such as from the left to the right of the printed circuit board, or from the top to the bottom. and,
Instead of wiring a single wire from start to finish as in the past, it is possible to connect electronic components such as connectors and IC chips mounted on printed circuit boards (the placement positions of electronic components have already been determined). The distribution of pins (connection points) in the wiring direction is taken, and the position with the highest distribution of pins (connection points) is set as the target position, and all wiring is performed for each section from the wiring start position to the first target position. Next, all the wiring is performed for each section from the first connection target position to the next second connection target position, and the wiring is performed until the final connection end point by sequentially repeating the connections between the connection target positions.

Note that, for example, if there is no pin to connect at the second connection target position and there is a pin at the next third connection target position, a temporary target is provided at the second connection target position and the connection from the first connection target is made. The temporary target is connected, and in the next step, the connection is made between the temporary target and the third connection target. Of course, if there is a pin (target) to be connected before the connection target position that we are aiming for this time, we will wire up to that point.

After wiring including the above-mentioned temporary target to the predetermined target position, if it is possible to wire electronic components such as IC chips in the opposite direction to the direction in which they have already been wired, it is better to shift them.
This is particularly effective when two wires are wired between 0.1 inches, so-called two-wire logic between pins, but it can also be applied when one or three or more wires are wired between 0.1 inches.

Of course, if there is enough space for the printed circuit board,
You don't have to send it.

Next, a specific example of two logic wiring lines between pins will be explained using FIG.

One pin A of a normal IC chip consists of four virtual logic lattice areas A, 2, 2 (here, the virtual logic lattice is a lattice virtually created on the printed circuit board). As shown in the figure, when wiring from pin A at the nth target position to pin B at the next (n+1)th target position, if the predetermined wiring direction is crossed, the pin Exiting from the upper right corner A of the logical lattice area of A,
For the wiring that enters the lower left corner of the logic lattice area of pin B (wire I) and passes through the section between this nth target position and the (n+1)th target position, A temporary target C is set at the (n+
1) A temporary target D is provided at the th target position, and wiring is established between these temporary targets C and D (wiring ■).

In this way, when wiring from one temporary target to the next temporary target, it is possible to have a directionality such as whether to maintain the same Y coordinate, or to go up as a whole, or to go down on the contrary.

When the wiring is completed to the (n+1)th target position, the pin at the (n+1)th target position is
Pack it as much as possible on the side opposite to the wiring direction X. of course,
If the pins of the electronic components at the n-th target position and the (n+1)-th target position belong to the same component, they cannot be brought together; in that case, the electronic component at the n-th target position When the pins of the electronic component are moved to the side opposite to the wiring direction, at the same time, the pins of the electronic component located at the (n+1)th target position are also moved by the same dimension to the side opposite to the wiring direction.

In the initial arrangement of electronic components, it is sufficient to spread them out loosely and place them in their approximate positions.

Through-holes also allow the use of smaller microvias than conventional ones.

Next, changes in wiring will be specifically explained using FIGS. 6 to 11.

Assume that a wiring diagram as shown in FIG. 6 is obtained by automatic wiring. In the figure, 20 is an IC chip to be connected, and 21 is a connection pin of the IC chip 20.

Reference numerals 22 denote wirings that connect electronic components such as the IC chip 20. Although only a few wires 22 are shown in the drawing to avoid complicated illustrations, in reality there are many wires 22 between electronic components.
2 is drawn. Reference numeral 23 denotes a cross-axis cursor on the display surface of the graphic display.

In the wiring diagram of FIG. 6, a case will be described in which the position of the line segment 22-1a of the wiring 22-1 among the many wirings 22 is changed.

This line segment 22-1a to be changed is located in a high-density wiring area and is in close proximity to a portion of other wiring. It would be good if this line segment could be held directly with the cursor 23, but since the vicinity of the line segment 22-1a is a high-density wiring area, this may be due to an erroneous operation or because the positional accuracy of the cursor 23 is poor.

There is a possibility that other wiring lines 22 may be held.

In this way, if the wiring 22 that does not need to be changed is held and changed, the wiring becomes incorrect, and it takes time to hold the wiring again.

Therefore, in the present invention, the line segment 22-
1a is not directly held, but as a first step, as shown in FIG. Line segment 22-1b located in an area with low wiring density
(easy hold line segment), move the cursor 23 onto the line segment (easy hold line segment) 22-1b, and
-1b is temporarily held. The line segment 22-1b held in this way has a different display color than other line segments (in the drawing, the held state is drawn with a thick line to indicate that the display color is different), and the operator This allows you to easily check the held line segment.

Next, as a second step, as shown in FIG. 8, the cursor 23 is moved near or on the line segment 22-1a to be changed. Then, based on the temporary hold signal of the previously held line segment 22-1b, the line segment 22-
The line segment 22-1a that is on the same line as 1b is automatically held, and the display color of the line segment 22-1a changes (
In the drawing, the held state is drawn with thick lines. )
.

It is easy to confirm that the hold has been placed.

Next, as a third step, as shown in FIG. 9 in this held state, move the cursor 23 to another area with low wiring density, draw a diagonal line segment 22-1c, and then The desired wiring change is completed by drawing a vertical line segment 22-1d by moving the cursor 23 as shown in FIG. 1O, and then drawing and connecting a diagonal line segment 11-1g as shown in FIG. 6. Although this modification example describes the case where the wiring is changed on the same plane, it can also be applied, for example, to the case where the wiring is changed from one side of a printed circuit board to the other side.

FIG. 12 and FIG. 13 are diagrams for explaining the drawing of the power supply line according to the embodiment of the present invention.

Power lines are different from normal signal lines because they have a wider line width.

When wiring, you will need to use a different line drawing program from that for signal lines.

As shown in FIG. 12, from one end of the signal line 41 to the power line 4
2, specify the coordinates of the width center points A and B and the width C, and draw a wide line. At this time, as shown in the same figure, a virtual straight line 43 extending in the X-axis direction and the power supply It is calculated whether the angle θ between the line 42 and the side l#44 to be drawn is smaller than a preset small angle (set to 10 degrees in this embodiment).

As a result of the judgment, if it is smaller, as shown in FIG. Since the 6 signal lines 4] drawn in The whole thing feels cleaner.

Note that if the angle θ is larger than a preset minute angle, the line drawing is performed at the same angle without making the above-mentioned correction.

If the minute angle is made as small as 10 degrees as mentioned above,
Even if the line drawing is corrected, the position of the center point B in the line width C is practically not displaced.

There is no problem.

In this embodiment, the angle formed with a virtual straight line extending in the You can draw a line.

It goes without saying that this power line wiring method can be applied to both power bus lines and power branch lines.

14 to 17 are diagrams showing the types of stretching patterns stored in a storage element such as a RAM for automatic wiring of power supply branch lines.

In these figures, 31 is a power supply branch line, 32 is a pin hole into which each pin of an IC element (in this example, a dual in-line type 14-pin IC element) mounted on the printed circuit board is inserted, and 32a is the pin hole No. 14. A power pin hole 32b is into which a power pin corresponding to the pin is inserted, and a ground pin hole 32b is into which a ground pin corresponding to pin No. 7 is inserted.

33 is the power supply cover llA31 on the front and back sides of the printed circuit board.
(The power supply branch line 31 on the Jl: side is shown by a broken line.) This is a through hole that was automatically created to connect the power supply branch line 31 on the Jl: side.

The stretching pattern of the power supply branch line 31 shown in FIG.
This type is used for relatively simple printed circuit boards in which the power supply branch line 31 extends in a direction perpendicular to the longitudinal direction of the IC element.

The extended pattern of the power source IA31 shown in FIG. 15 is an advanced version of the basic pattern shown in FIG. 14, and in order to make it easier to connect a bypass capacitor (not shown),
Through holes 33, 33 are provided, and the power supply branch line 31 is drawn out to the back side of the printed circuit board.

The power branch line extension pattern shown in Figure 16 is a pattern often applied to printed circuit boards that allow high-density mounting.
The longitudinal direction of the IC element and the extending direction of the power supply branch line 31 coincide.

The stretching pattern shown in FIG. 17 is a development of the basic pattern shown in FIG.
1 and through holes 33 are formed respectively.

Various other extension patterns of the power supply branch line 31 can be registered as needed, and each pattern is assigned a pattern code such as a number or an alphabet.

Further, the memory element includes a power supply in which the pin numbers of power supply pins and ground pins are arranged according to the type of IC element.

Ground pin number data is stored. That is,
In the case of the 14-pin type IC element 34 shown in FIG.
Although not shown, in the case of an 8-pin type IC element, 4
Since the No. 8 pin corresponds to the ground pin and the No. 8 pin corresponds to the power supply pin, these pin numbers are stored in correspondence with the type of IC element.Furthermore, each pin of the IC element is stored in the memory element. The position is expressed as XeV coordinate data with respect to the center position of the IC element.
Pin position data organized by type of C element is stored.

That is, the 14-pin type IC element 34 shown in FIG.
In the case of , with the center position O of the IC element 34 as a reference,
The pin position of the 1st pin is Xx+Y' coordinate data, 2
The pin position of the number pin is as X2゜y2 coordinate data...
・・・・・・・・・The pin position of pin 14 is X14.
It is stored as y14 coordinate data in correspondence with the type of IC element.

The aforementioned various branch line extension patterns, power supply, ground pin number data, and pin position data are stored as a database at a predetermined address such as a RAM.

Although not shown, input information such as the type of IC element to be mounted on the printed circuit board can be entered using input means such as a keyboard.
The rotation angle of the IC element to be mounted with respect to a predetermined reference direction with the center position of the C element as the rotation center, the length and line width of the power supply branch line, etc. are input to the control unit of the wiring device. .

The rotation angle of the IC element to be mounted will be explained using FIGS. 18 to 21. For example, the arrangement state of the IC element 34 shown in FIG.
The rotation angle of the C element 34 is assumed to be 0 degrees. As shown in FIG. 19, when the IC element 34 is rotated 90 degrees counterclockwise around its center IO, the rotation angle is 90.
Every time.

The state shown in FIG. 20 is a rotation angle of 180 degrees, and the state shown in FIG. 21 is a rotation angle of 270 degrees. In this embodiment, the four rotation angles mentioned above can be specified, but the number of rotation angles can be increased if necessary.

Next, examples of the length L, line width W, etc. of the power supply branch line 31 will be explained with reference to FIG. 22. The length of the power supply branch line 31 may be, for example, the total length L1 in the stretching direction. Alternatively, there is a length 2 from the center of the pin hole 32 to the end of the power supply branch line 31. Further, the line width W of the power supply branch line 31 may be, for example, Wl, W2, etc. as shown in the figure. There are W3 etc.
The length and line width W of these power supply branch lines 31 can be input freely using a numeric keypad or the like.

Further, a necessary stretching pattern can be selected from among the plurality of branch line stretching data by using a keyboard as a selection means. As described above, pattern codes such as numbers and alphabets are individually assigned to the plurality of branch line stretching patterns, so patterns can be freely selected by inputting the pattern codes.

In this way, the pattern selection signal from the selection means, the input signals such as the type of IC element, the rotation angle of the IC element, the length and line width of the power branch line from the input means, and the input signals are stored in the storage means. For example, as shown in FIG. 14, the source branch lines 31 are automatically drawn around the IC elements to be wired.
delineation means).

FIG. 23 and FIG. 24 are diagrams for explaining connections between power supply branch lines 31.

For example, suppose that power supply branches A@31 around the IC element are drawn at predetermined intervals as shown in FIGS. 23(a) and 23(b). Then, as shown in FIG. 24, both power supply branch lines 31.
5 automatically connects. Although this example describes the case where the power supply branch lines 31 are connected together, the power supply branch line 31 and a signal line may also be connected.

(Effects of the Invention) Since the present invention has the above-described configuration, wiring of the power supply line can be performed very easily, the wiring condition is clean, and the wiring work can be made more efficient and the design time can be shortened. It has features such as being able to achieve

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the basic system configuration of an automatic wiring device according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the processing operation of the automatic wiring device, FIG. 3 is a circuit diagram of an example printed circuit board, FIG. 4 is a wiring diagram of a printed circuit board formed based on the circuit diagram, and FIG. Figure 5 is an explanatory diagram for explaining a specific example of automatic wiring, and Figures 6, 7, 8, 9, 10, and 11 are explanatory diagrams for explaining examples of wiring changes. Figures 12 and 13 are diagrams for explaining how to connect signal lines and power supply lines, Figures 14, 15, and 16.
Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21
Figures 22 and 22 are diagrams for explaining automatic wiring of power supply branch lines around IC elements, Figures 23 and 24.
The figure is a diagram for explaining connections between power supply branch lines. 31...Power supply branch line, 32...Pin hole,
32a...Power pin hole, 32b...Ground pin hole, 33...IC element, 34...
...Connection branch line, 41...Signal line, 42...
...Power line, 43...Virtual straight line, 44...
...Side edge, O...Center position of IC element, L.
...Length of the power branch line, W...Line width of the power branch line. Figure 4 Figure 5 Figure 1υ Figure 10 Figure 11 Figure 2゜ Figure 12 Figure 14 Figure 18 Figure 20 Figure 15 Figure 17 Figure W!

Claims (4)

[Claims] (1) In the printed circuit board wiring method for connecting signal lines and power supply lines, a virtual straight line extending in the x-axis direction, a virtual straight line extending in the y-axis direction, or a virtual straight line extending parallel to the outline of the printed circuit board. It is determined whether the angle formed between one virtual straight line and the side edge of the power supply line to be drawn is smaller than a preset minute angle, and if it is determined to be small, the angle between the virtual straight line and the side edge of the power line to be drawn is determined. A wiring method for a printed circuit board, characterized in that the side edge of the power supply line is drawn. (2) The printed circuit board wiring method according to claim (1), wherein the set minute angle is 10 degrees. (3) A plurality of branch line extension patterns in which the extension patterns of the power supply branch lines for IC elements are different from each other, each with a pattern code, and power supply and ground pin numbers arranged according to the type of IC element. a storage means for storing in advance pin number data and pin position data organized by type of IC element as x, y coordinate data of each pin position of the IC element with respect to the center position of the IC element as a database; selection means for selecting an appropriate stretching pattern from the branch line stretching data, the type of IC element, the rotation angle of the IC element to be arranged with respect to a predetermined reference direction with the center position of the IC element as the rotation center, and the power supply branch line. an input means for inputting the length of the line and the line width of the power supply branch line, and an IC element to be wired based on a selection signal from the selection means, an input signal from the input means, and the database stored in the storage means. 1. A wiring device for a printed circuit board, comprising at least a wire drawing means for automatically drawing peripheral power supply branch lines. (4) The printed circuit board according to claim (3), wherein the multilayer printed circuit board is configured such that a layer to which wiring is to be applied is specified by input from the input means. wiring device.