JPS61196374A - Method of automatically preparing circuit diagram - Google Patents

Abstract

PURPOSE:To automatically prepare the optimum circuit diagram by finding two points to be connected between circuit symbols placed in a drawing and repeating the work of finding the optimum wiring pattern for connecting the two points. CONSTITUTION:The first thing to be done is to find the two points to be connected using net numbers or the like, and the second is to find the optimum wiring route between the two points. If this optimum wiring route cannot be found, search for other two points. And yet, if the wiring route next to the optimum cannot be found, prepare the symbol connector indicating that wiring jumps from the current place to another place, thereby ececuting the wiring. If there is no appropriate place were the signal connector cannot be allocated, allocate the signal connector even if it overlaps another symbol or wiring. Next, check whether there still remain the pins that must be connected not, and if such pins exist, return to step 10, or otherwise end the processing.

Description

[Detailed Description of the Invention] [Summary] The present invention is a system that automatically generates a circuit diagram, which detects two points to be wired in each circuit component symbol placed on the drawing, and then A wiring pattern to be wired between points is selected from among a plurality of predetermined methods, and the wiring is performed automatically by repeating such a procedure to generate a circuit diagram. This reduces the effort required to create and modify circuit diagrams.

[Industrial application field]

The present invention relates to a system for automatically generating a circuit diagram, and more particularly to an automatic circuit diagram generation system for generating a circuit diagram by automatically wiring circuit symbols placed by an automatic placement system or the like. be.

Conventionally, this has been done by relying on skill and labor by providing a computer with information on the circuit component symbols and the connections between the terminals of each component symbol. Therefore, there is a need for a system that can easily and quickly perform wiring between component symbols arranged on a circuit diagram without requiring any human intervention, thereby significantly reducing the burden on circuit designers.

[Conventional technology]

In response to such a demand, the conventional practice has been to simply store component names and connection information for the components in a memory, and automatically create a wiring pattern for a printed board from this information. Therefore, when it comes to circuit diagrams, the circuit diagrams are automatically created by automatically wiring between each circuit component symbol placed on the drawing based on information about the connections between circuit component symbols such as AND gates and OR gates and the terminals of each component symbol. In the past, it has not been possible to generate the information manually, and it has been done exclusively by hand, relying on skill and labor.

[Problem that the invention seeks to solve]

For this reason, it takes a lot of time to create a circuit diagram, and when creating a circuit diagram with a part changed or modified, the remaining parts must be created again by hand, and the changes and corrections take a lot of time. The problem was that it required a lot of time. Furthermore, since it was done manually, it was difficult to prevent drawing errors.

[Means for solving problems]

In the automatic circuit diagram generation method of the present invention, in step S1, as shown in FIG. 2 given a net number
After detecting a point, a predetermined wiring pattern is extracted in step S2, and then, in step S3, it is determined whether the connection between these two points is optimal or not, which is repeated. to generate a circuit diagram.

[For production]

The automatic circuit diagram generation system of the present invention repeats the steps of finding two points to be connected between circuit symbols placed on a drawing, and then finding the optimal wiring pattern to connect those two points. By returning it, all the wiring is done and a circuit diagram is generated, so the circuit diagram can be automatically generated.

〔Example〕

FIG. 2 shows an embodiment of the automatic circuit diagram generation method of the present invention, in which 1 is a file containing information on circuit components and their connections, 2 is a conversion section, 3 is a work file, and 4 is a file containing information on circuit components and their connections. 5 is an automatic placement system, 5 is an automatic wiring system, 6 is a converter, 7 is a circuit diagram file, 8 is a library, and 9 is a drawing system.

For example, circuit components and their connection information used for automatically designing a printed circuit board pattern are coded and loaded into file l. The information loaded into the file 1 may be connection information of a circuit designed using a circuit synthesis language from a logic circuit synthesis system. The information held in file 1 can be read out and used for printed circuit board design, parts arrangement systems, and the like.

The conversion unit 2 extracts data necessary for circuit diagram creation work and data such as the shape of circuit symbols held in the library 8 from the information on circuit components and their connections held in file l, and performs the work. input into file 3. In the work file 3, the arrangement of each symbol is determined by performing the work according to the arrangement method defined in the automatic arrangement system 4. Next, the automatic wiring system 5 performs work according to a predetermined wiring method to determine the wiring between each symbol.

For wiring, first, terminals of symbols to be connected are arbitrarily extracted from each circuit component and its connection information. For example, in the circuit components and their connection information loaded into file 1, each symbol is assigned a net number as information for making connections (called nets) between symbols, so they have the same net number. A circuit diagram is generated by wiring the pins to connect them.

The conversion unit 6 refers to the data extracted from the work file 3 and data such as the shape of a circuit symbol held in the library 8 to create, for example, a circuit diagram file 7 of an existing CAD system.

The drawing system 9 draws a circuit diagram on paper, for example, based on the data in the circuit diagram file 7.

FIG. 3 explains the wiring order of the same net.

Now, in the logic element group shown in the same figure (al), each point connected by a broken line has the same net number, and the connection relationship between element A shown with diagonal lines and each of these elements is shown. When it is desired to realize the above, the required wiring is performed by sequentially connecting each point according to the numbers (■, ■, -) assigned to each element, as shown in FIG. 2(b).

FIG. 4 is a flowchart showing a wiring method between pins that are to be connected. That is, first, two points to be connected are searched for using net numbers, etc. (step 510). Next, an optimal wiring route between the two points is found (step 520).

When a wiring route is found, wiring is performed using this method, but when it is not found, two other points are searched (step 53).
0). If it is found, the process returns to step S20; if it is not found, a signal connector is generated to indicate that the wiring will jump from that part to another location (step 540). When the signal connector can be placed on the drawing, wiring is performed accordingly, and if the signal connector cannot be placed due to lack of space, it is placed even if it overlaps with other symbols or wiring (step 550). Next, it is checked whether there are any pins left to be connected (step 560); if there are, the process returns to step SIO; if there are not, the process ends.

Next, a method for finding two points to be connected will be explained with reference to FIG.

■ Connect the symbol pins (Fig. 5(a)). In the figure, connection is made from the output pin of element A to pin 2 of element B.

■If the connection between symbol pins has been completed at one point and you are trying to make another connection, if the already completed wiring is a straight line, the midpoint of that line segment and the symbol to be connected next Connect the pins (Fig. 5(b)). In the figure, since the output pin of element A and pin 2 of element B are connected in a straight line, it is shown that the output pin of element A is connected to pin 2 of element C from the midpoint.

■In cases other than the above, the endpoints of the line segments forming the wiring (
WU is performed on the end point of the bent portion) near the symbol pin to be connected next and that symbol pin (FIG. 5(C)).

In the figure, it is shown that the end point E of the wiring connecting the output pin of the element A and the output pin 2 of the element B is connected to the pin 2 of the element C.

When two points to be connected are found in this way, 2
Find the wiring route between the points as shown in Figure 6.

■If two points can be connected in a straight line, use a straight wiring route (Figure 6 (a)).

■If it is not possible to connect two points in a straight line, use a wiring route that allows the connection with only one bending point (see Figure 6 (b).
)).

■If you cannot connect two points with a wiring that has one bending point, or if you connect using a wiring route that has two bending points and it overlaps with other symbols, set the bending point in advance. A wiring route is adopted that allows connection by shifting the distance by the distance shown in Figure 6 (C).
). In the figure, since the bending point of the wiring connecting element A and element B overlaps element C, an example is shown in which the bending point is shifted by a distance of 2 units to enable connection as E.

If wiring cannot be done by following steps 0 or more, search for a wiring route by increasing the number of bending points one by one and repeating the steps (■■).

In this case, if the number of bending points is increased, the number of routes to be searched will increase rapidly, and it will take time to find the desired route, so the number of bending points should be 4 to 5. It is appropriate to set a limit.

Furthermore, if wiring cannot be established between the first two points found, two other points are found as shown in FIG.

■If it is not possible to connect the midpoint of the already completed wiring to the symbol pin to be connected next, as shown in Figure 5 (bl), the wiring has already been completed as shown in Figure 7 (a). Shift the connection point by a preset distance from the center point on the wire that is currently in use to find two connectable points.Figure 7 (a)
), it is shown that a connectable wiring route is found by connecting element C to points ■, ■, -, which are sequentially shifted by unit distance from the center point on the wiring connecting elements A and B. .

■As shown in Figure 5 (C), if it is not possible to connect the end point of the line segment forming the wiring with the symbol pin, set the connection point in advance from the end point as shown in Figure 7 (bl). Find two points that can be connected by shifting the distance by the specified distance.

In Fig. 7(b), a connectable wiring route can be found by connecting element B to points ■, ■, -, which are sequentially shifted by unit distance from end point F on the wiring connecting elements A and C. It is shown.

If a wiring route cannot be found even after performing all of the above steps, a signal connector is generated to indicate that two points are electrically connected and placed at each of the two points. If there is no place where the signal connector can be placed, place it at that position, even if it overlaps with other symbols or wiring.

The circuit diagram is generated by wiring all the nets in the circuit diagram using the method described above.

〔Effect of the invention〕

As explained above, according to the automatic circuit diagram generation method of the present invention, two points placed on a drawing and given the same net number indicating that they are in a connection relationship are detected, and a predetermined By repeatedly performing the steps of extracting a pattern that matches the connection between these two points from the wiring pattern and wiring it, a circuit diagram is generated by wiring between the component symbols that make up the circuit diagram. The work of generating circuit diagrams from information on circuit component symbols and the connections between terminals of each component symbol, which previously had to be done manually, can now be done automatically, thus significantly reducing the burden on designers. I can do it.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the flow of the present invention, FIG. 2 is a diagram showing an embodiment of the automatic circuit diagram generation method of the present invention, FIG. 3 is a diagram explaining the wiring order of the same net, and FIG. A flowchart showing a wiring method between pins in a connection relationship, Figure 5 is a diagram explaining a method of finding two points to be connected, Figure 6 is a diagram explaining a method of finding a wiring route between two points, and Figure 7 is a diagram explaining a method of finding a wiring route between two points. The figure is a diagram illustrating a method of searching for another wiring route between two points. 1--File containing information on circuit components and their connections, 2-Conversion unit, 3-1 Work file, 4--Automatic placement system, 5-Automatic wiring system, 6-Conversion unit, 7-Circuit Figure file, 8 - Library, 9 - Flowchart of the invention of the drawing system Fig. 1 / Stem configuration diagram of an embodiment of the present invention Fig. 2 (α) (b) Diagram explaining the wiring order of the same net Fig. 6 Figure (c) Diagram explaining how to find two points to be connected Figure 5 Figure (α) Diagram explaining how to find the wiring route between two points Figure 6
figure

Claims (1)

[Claims] In a method for automatically generating a circuit diagram from information on circuit component symbols and connections between terminals of each component symbol, a step of detecting two points to be connected arranged on the drawing (S1
), and a step (S2, S3) of repeatedly performing a procedure of extracting a pattern suitable for the connection between the two points from among predetermined wiring patterns and performing wiring. Automatic diagram generation method.