JPH044471A - Parts position deciding device - Google Patents

Abstract

PURPOSE:To improve the workability of the parts position deciding device and, at the same time, to easily take a measure against noise by deciding the parts arranging coordinates on a printed wiring board so that the coordinates can correspond to the parts arranging coordinates on the circuit diagram of the board. CONSTITUTION:This device is provided with a keyboard 2 as an input device, storage device 3 composed of a memory or disk device, and CPU device 4 as a controller. The device 4 is equipped with control functions for designing circuit diagrams and whole printed wiring boards and a position deciding function as part of the control functions. Accordingly, the arranging relation of parts on a printed wiring board becomes nearly the same as that on the circuit diagram of the board, since the parts arranging coordinates on the printed wiring board can be decided so that the coordinates can correspond to the parts arranging coordinates on the circuit diagram of the circuit. Therefore, a measure can be taken easily against noise and, since the arrangement of parts is automatically made, the workability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a component position determining device for determining the position of a component on a printed wiring board.

(Prior Art) When designing a printed wiring board, in recent years, so-called CAD is used to determine the positions of components on the printed wiring board, and also to design wiring to connect the parts whose positions have been determined. I am working on drawing a conductor pattern. The above CAD, as shown in Figure 10,
A display 1 consisting of a CRT or the like as an output device, a keyboard 2 as an input device, a storage device 3 consisting of a memory device or a disk device, and a CPU device 4 as a control device.
It consists of Although not shown, a printer is provided as an output device, and a keyboard, mouse, etc. are provided as input devices. In such a configuration, conventional methods for determining the position of components on a printed wiring board include an interactive placement method and an automatic placement method. In both types, parts are arranged based on the connection data shown in FIGS. 11 and 12. Here, the connection data consists of component data shown in FIG. 11 and signal line data shown in FIG. 12.

The component data consists of the name of the component on the circuit diagram and the product number indicating the rating of the component. In FIG. 11, rIcIJ, "Ic2J, . . . are the names of the parts, r74LS○○O" is the product number of the part "IC1", and r74LsxxxJ, . . . are the parts rIc2.
J, . . . are each product number. Further, the signal line data includes the name of the signal line, the name of the component connected by the signal line, and the pin number of the component. In FIG. 12, rSIGOO98J is the name of the signal line, and rIC42-43IC43-14 is the name of the component connected by the signal line and the pin number of that component. In this case, the pin number 43 of the component IC42J is Part [1c43J pin number 14 and signal line rsIGOO9
It means to connect by 8J. Below, signal line r
The same applies to SI GOO99J, .

The connection data described above is created based on the circuit diagram.

Now, the dialog arrangement method will be explained with reference to FIG. In this method, when the connection data is input, an image of the printed wiring board 5 and images of a plurality of parts 6 to be placed are first displayed on the display 1. In this case, the parts 6 are displayed in an area outside the printed wiring board 5, and the user then operates the keyboard 2 to place each part 6 on the printed wiring board 5 one by one. I try to do this.

On the other hand, in the automatic placement method, when the above connection data is input, the components are placed on the printed wiring board so that the total length of the signal line, that is, the conductor pattern is the shortest, and an image of the placed state is displayed on the display 1. It has become so. After such a display is made, the arrangement of parts is optimized using an interactive arrangement method.

(Problems to be Solved by the Invention) There are two principles when arranging components on a printed wiring board. The first is to arrange the components in a manner as close as possible to the arrangement of the components on the circuit diagram. This is because, for example, by increasing the distance between components on the input side and components on the output side, parts that are susceptible to noise can be grouped together to facilitate noise countermeasures. The second is,
The conductor pattern should be arranged so that its total length is the shortest. This is because the noise acting on the conductor pattern can be reduced as a whole. It is desirable to realize the above two principles with priority given to the first principle.

On the other hand, in the conventional configuration described above, in the case of the interactive placement method, components had to be placed one by one manually while looking at the circuit diagram, which was troublesome and had poor work efficiency. On the other hand, in the automatic placement method, the conductor pattern is automatically placed so that the total length is the shortest, improving work efficiency and
Only the second principle mentioned above is satisfied. However, the arrangement of components on a printed wiring board is often completely different from the arrangement of components on a circuit diagram. For example, components on the input side and components on the output side may be mixed together. However, there was a problem in that noise countermeasures became difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a component position determining device that can improve workability and facilitate noise countermeasures.

[Structure of the Invention] (Means for Solving the Problems) A component position determining device of the present invention is for determining the position of a component on a printed wiring board. The present invention is characterized in that it includes position determining means for determining placement coordinates so as to correspond to placement coordinates of the component on the circuit diagram.

(Operation) According to the above means, the arrangement coordinates of the components on the printed wiring board are determined to correspond to the arrangement coordinates of the components on the circuit diagram, so the arrangement relationship of the components on the printed wiring board is The relationship is almost the same as the arrangement of parts in the diagram. Therefore, noise countermeasures become easy. Further, since the above-mentioned parts are arranged automatically, work efficiency is improved.

(Example) The following is an example of applying the present invention to CAD for circuit diagram design and printed wiring board design.
This will be explained with reference to FIG. 0 and FIG.

First, the overall hardware configuration is shown in FIG. 10, and includes a display 1 such as a CRT as an output device and a printer (not shown), and a keyboard 2, a mouse (not shown), and an online system (not shown) as input devices. It is equipped with an input device, etc., a storage device 3 consisting of a memory device or a disk device, and a CP as a control device.
It is equipped with a U device 4.

The CPU device 4 has a control function for performing overall circuit diagram design and printed wiring board design, and has a function of position determining means as a partial function thereof.

The flowcharts shown in FIGS. 1 and 2 show the content of the function for determining the position of a component on the printed wiring board among the control functions of the CPU device 4, that is, the function of the position determining means and the control functions around it. It shows. The control for determining the position of components on the printed wiring board will be explained below with reference to FIGS. 1 and 2.

In FIG. 1, a circuit diagram is first input (step Sl
). Here, you can draw and input the circuit diagrams 11 and 12 shown in FIGS. 3 and 4 using a CAD for circuit diagram design, or after drawing them using a cAD for circuit diagram design,
The circuit diagrams 11 and 12 stored in the storage device 3 are read out. Here, circuit diagrams 11 and 12 show circuit diagrams for each page. In this case, the specific data for circuit diagrams 11 and 12 includes, for example, the names of circuit elements such as AND circuits, operational amplifiers, and resistors, the coordinates of the circuit elements in the circuit diagram, that is, the coordinates of the circuit elements directly above, and the names of the wiring that connects the circuit elements. Coordinates indicating the arrangement of wiring on the circuit diagram, names of actual parts (eg, ICs, resistors, etc.) corresponding to the circuit elements, and their part numbers (eg, ratings, etc.) are input and stored.

Although only circuit diagrams 11 and 12 for two pages are shown,
Actually, there are 0 pages of circuit diagrams (n is a natural number). continue,
Connection data and data on component arrangement coordinates on the circuit diagram 11.12 are created (step S2). As connection data, the component data and signal line data already explained in the conventional configuration are automatically created based on circuit diagrams 11 and 12.

Component data is shown in the two columns on the left in FIG. 6, and signal line data is shown in FIG. In addition, the data on the arrangement coordinates of components on the circuit diagram 11,]2 is specifically the page number of the circuit diagram and the coordinates of the component directly above it, and is shown in the two columns on the right in FIG. There is. The page number of the circuit diagram is “
Pl”, “P2”, rPnJ, each one page,
Pages 2 and 0 are shown. The coordinates of the part directly above are determined when the page is divided into 16 unit sections as shown in Fig. 5, that is, the X coordinate is set to 1.2.3°4 in the orthogonal coordinate system, and the Y coordinate is set to A, ' When B, C, and D are the coordinates representing the unit section where the parts are arranged. In other words, the coordinates of the parts directly above are expressed as "2B", "3B", etc., indicating that the parts are arranged in unit sections 2B, 3B, etc. of the page. Now, for example, the layout coordinates of component ICI on circuit diagram 11 are as follows: component ICI is unit section 2 on page 1.
Since it is located at B, it becomes rPl 2BJ (see Figure 6).

Next, a process for determining the position of the component on the printed wiring board is started (step S3). In this case, it is possible to arrange multiple pages of circuit diagram components on one printed wiring board, so the area on the printed wiring board is large enough to accommodate one page of circuit diagram components. A region (hereinafter referred to as a page region) is set, and the position of the component is determined within this page region. Starting from the circuit diagram 11 on the first page, processing is performed in order up to the circuit diagram on the last page (PMAX) (steps 84 to S9). Here, the process of arranging one page's worth of circuit diagram components in the page area of the printed wiring board (step S5
) will be explained according to the flowchart in FIG.

Regarding the page area of the printed wiring board, in the same manner as the case of the circuit diagram, the page area is divided into, for example, 16 unit sections as shown in FIG. , m, IV, and the Y' coordinates are a, b,
Set c and d. As a result, the unit section IA of the circuit diagram
, IB, IC, . . . correspond to unit sections 1a, Ib, IC1, . . . of the page area of the printed wiring board, respectively. The outline of the component arrangement shown in FIG. 2 is the unit section IA of the circuit diagram.

113.1. The parts arranged in C, . . . are respectively arranged in unit sections Ia, Ib, Ic, .

Ic, . . . are arranged with one component each. Below, to explain specifically, first, the first part U
n (n=1), the page number Pn of the circuit diagram, and the coordinates (Xn, Yn) of the component directly above the circuit diagram are read (steps Q1 to Q4). Next, the unit section of the page area of the printed wiring board corresponding to the above coordinates (Xn, Yn) (coordinates (X-n
, Y-n))), step Q5), and if not, the coordinates of the component Un in the page area on the printed wiring board are determined (X
"n, Y"n) (step Q6). and,
After counting up n, the process returns to step Q2 and the next component is placed (step Q7-8). On the other hand, in step Q5, if another component has already been placed, the X' coordinate is added and the component is placed in the unit section on the right in FIGS. 8 and 9. Here, as a result of adding the X-coordinates,
When ' exceeds X-MAX (in this case, ■), set X' to X8 (in this case, I) and add the Y' coordinate.

Then, as a result of adding the Y-coordinates, the result is Y′ or Y″X (
In this case, if d) is exceeded, the part Un is set as an unprocessed part (steps Q9 to Q13). Thereafter, the above-mentioned arrangement is performed for all parts within the page (step Q8).
).

Then, the process moves to step S6 in FIG. 1, and if there is an unprocessed part, the unprocessed part is placed in a unit section for unprocessed parts (step S7). Thereafter, the page number is counted up and the process returns to step S5 to arrange the parts on the next page (steps S8 and 9). Hereinafter, the above-mentioned arrangement is performed for the parts of all pages. Next, a plurality of page areas are placed on one printed wiring board while being moved in page area units (step 510). Here, for example, the layout is performed in page area units using an interactive layout method. Then, the unprocessed components are placed at appropriate positions on the printed wiring board using the same interactive placement method (step S11). In addition, for example, display image data of the parts is stored in the storage bag 3 as part data for designing the printed wiring board in advance. This is stored (step 512), and when displaying on the display 1 the state in which the parts are arranged on the printed wiring board, the display image data of the parts is read out and displayed.

After the components are placed on the printed wiring board, the wiring that connects the components is automatically placed based on the connection data described above (Figure 12), and the placement of the conductor patterns is determined. . With the work up to this point, the placement of components and conductor patterns on the printed wiring board is almost complete, and the next step is to optimize the placement of components and wiring using an interactive method to minimize wastage of the board.

According to this embodiment having such a configuration, the page number Pn and the coordinates (
Since X-n, Y-n) are determined to correspond to the page number Pn and the coordinates (Xn, Yn), which are the placement coordinates of the components on the circuit diagram, the placement relationship of the components on the printed wiring board is , the relationship is almost the same as the layout of the components on the circuit diagram. Therefore, for example, the distance between the input-side components and the output-side components can be increased, and noise countermeasures can be easily taken. Further, since the above-described component arrangement is automatically performed, work efficiency is improved.

In the above embodiment, the data of the arrangement coordinates of the parts on the circuit diagrams 11 and 12 are automatically created.
Alternatively, you can create it manually.

In this case, draw the unit sections shown in Figure 5 on the circuit diagram drawn on the drawing paper, visually recognize in which unit section the parts are placed, and then draw the lines as shown in Figure 6. This is to create data on the location coordinates of parts. Further, a means for reading the handwritten drawing paper and automatically creating the coordinate data shown in FIG. 6 based on the information may be added, and the position of the parts may be determined using the data from the means. Furthermore, in the above embodiment, the circuit diagram is applied to a case where the circuit diagram is multiple pages and the printed wiring board is one piece, but when the circuit diagram is one page and the printed wiring board is one piece, or the circuit diagram is one page Of course, the present invention may also be applied when there are a plurality of printed wiring boards.

[Effects of the Invention] As is clear from the above description, the present invention has a configuration in which the arrangement coordinates of the component on the printed wiring board are determined to correspond to the arrangement coordinates of the component on the circuit diagram. This has excellent effects in that workability can be improved and noise countermeasures can be easily taken.

[Brief explanation of drawings]

1 to 10 and 12 show one embodiment of the present invention, FIGS. 1 and 2 are flowcharts, FIGS. 3 and 4 are circuit diagrams, and FIG. 6 is a diagram showing the partitioning state in which the circuit diagram is divided into unit sections, FIG. 6 is a diagram showing component data and data on the arrangement coordinates of components on the circuit diagram, and FIG. 7 is a diagram showing the division state in which the circuit diagram is divided into unit sections. 8 and 9 are diagrams showing the state in which components are arranged in the page area of the printed wiring board.
FIG. 0 is a front view schematically showing the hardware configuration, and FIG. 12 is a diagram showing connection data. Also, Figures 11 and 13
The figure shows the conventional configuration; Figure 11 is a diagram equivalent to Figure 6;
FIG. 13 is a diagram showing the screen of the display. In the drawing, 1 is a display, 3 is a storage device, and 4 is a CPU.
The device, 11.12 is a circuit diagram, and 13 is a component. Agent Patent Attorney Noriyuki Chika 3 Figure IIIW II [I [■ Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. For determining the position of a component on a printed wiring board, a position determining means for determining the placement coordinates of the component on the printed wiring board so as to correspond to the placement coordinates of the component on the circuit diagram. A component positioning device characterized by comprising: