JPS6198477A - Wiring design system by cad - Google Patents

Abstract

PURPOSE:To avoid a mutual adjoining of signal lines and to prevent interference by securing a lattice point to wire non-signal lines of a constant electric potential of an electrical power source line, an earth line, etc., mutually between signal lines which run in parallel. CONSTITUTION:First an initial value of the using condition of the lattice point for wiring is written in a lattice point information memory part 1 from an input part 4. Next, after wiring designating information is inputted and written in a memory part 5 temporarily, a wiring classification is judged by a control part 6 and for the signal line, wiring start is commanded to a signal line processing part 2. The signal line processing part 2 reads temporarily starting point data from a memory part 5, refers, to a lattice point using condition of the lattice point information memory part 1, the shortest channel is set, temporarily stored at the memory part 5 and simultaneously, the lattice point using data of the lattice point information memory part are renewed. After that, a non-signal line processing part 3 is driven, and an unused lattice point, which is adjoining to the set signal line channel, is secured.

Description

[Detailed description of the invention] purpose of invention Industrial applications.

The present invention relates to a wiring design system using CAD.

BACKGROUND OF THE INVENTION Currently, CAD (computer-aided design) is used in wiring design for LSIs, printed wiring boards, and the like.

This type of CAD-based wiring design system includes a storage means for storing wiring grid point information including usage/unused status of wiring grid points designated for wiring routes, and a storage means for storing wiring grid point information including usage status of wiring grid points designated for wiring routes, and A means for sequentially accepting wiring designation information including point information, setting a new wiring that connects unused grid points based on the accepted wiring designation information and wiring grid point information, and updating the wiring grid point information. equipped with the means.

Conventionally, the new wiring has been set to be the shortest route connecting unused grid points between the start and end points. That is, as illustrated in FIG.

Lattice point A1. When wiring settings are specified with A4 as the starting point and ending point, respectively, if lattice points A2 and A4 that exist on the shortest path between these starting and ending points are unused, 3, the straight wiring A that passes through these points is Set. After this, when wiring settings are specified with grid points Bl and 'B7 as the starting point and ending point, respectively, if grid points B2 to B6 existing on the shortest path between these starting and ending points are unused,
Problems to be solved by the invention in which a straight line B is set via these points In the conventional system described above, the unused grid points between the start and end points are Wiring is set so that it is the shortest route in a row. Therefore, in the example shown in Figure 5, if wires A and B are both signal wires, as the parallel length of the nine signal wires increases, the interference between signals increases, which may cause malfunctions in the electrical circuit. Become. In order to prevent such interference, it is necessary to manually change the wiring, which poses a problem in that a great deal of effort and time must be spent on this.

Means for Solving the Problems of the Structure of the Invention The system of the present invention for solving the problems of the prior art described above has a system for wiring non-signal lines with a constant potential, such as power lines and ground lines, between signal lines. Avoid adjacent signal lines by securing grid points! It is configured as follows.

Hereinafter, the operation of the present invention will be explained in detail by way of examples.

Embodiment FIG. 1 is a functional block diagram showing the configuration of a system according to an embodiment of the present invention.

This system consists of a grid point information storage section 1, a signal line processing section 2
．． Non-signal line processing section 3. Input section 4. Temporary storage unit 5. It is composed of a control section 6 and an output section 7.

At the start of the wiring process, first, the initial value of the grid point information is set in the grid point information record 1. Written to section q. As illustrated in FIG. 2, this lattice point information consists of a table of data displaying the identification number of each wiring lattice point, the X and Y coordinates of that lattice point, and the usage status.

What is the usage status of each wiring grid point?

(1) Unused.

(ii) Already used for signal line wiring.

(iii) Already used for wiring non-signal lines.

(1■) Already reserved for wiring of non-signal lines.

(v) Use in wiring is prohibited.

falls under any of the following.

The use of grid points at element placement locations and component mounting locations for wiring is prohibited. Therefore, the initial value of the usage status of the lattice point written in the lattice point information storage section 1 is either (i) or (V
).

After the initial setting of the grid point information, the first wiring designation information is read by the two-manpower section 4 and written into the temporary storage section 5. As illustrated in FIG. 3, this wiring designation information includes a wiring identification number, a wiring type, a name, and starting and ending point data consisting of X and Y coordinates. Wiring types include signal lines that cause potential changes and non-signal lines such as ground lines and power supply lines that do not cause potential changes.

The control unit 6 determines the wiring type in the wiring designation information written in the temporary storage unit 5, and if this is a signal line, instructs the signal line processing unit 2 to start wiring processing of the signal line. .

The signal line processing unit 2 that has started the process reads the start and end point data from the temporary storage unit 5, and while referring to the grid point usage status in the grid point information storage unit 1, sets the shortest wiring route connecting unused grid points. do. The signal line processing section 2 writes the set wiring route into the temporary storage section 5, updates the lattice point usage status data in the lattice point information storage section 1, and notifies the control section 6 of the end of the process.

Upon receiving the above notification, the control section 6 instructs the non-signal line processing section 3 to start processing.

The non-signal line processing unit 3 that has started the process reads the set wiring route from the temporary storage unit 5, and secures grid points for the non-signal line while referring to the grid point usage status in the grid point information storage unit 1. do.

As illustrated in FIG. 4, it is assumed that the wiring route of the signal line set by the signal line processing unit 2 is a route A connecting grid points AI, A2, A3, and A4. The non-signal line processing unit 3 determines whether the four grid points al to a4 on the route a adjacent to the route A and the four grid points B3 to B6 on the route B are unused or not. Those detected and unused are reserved for wiring of the non-transmission line 1', and the grid point usage status data in the grid point storage section 1 is updated. When this update is completed, the non-signal line processing section 3 notifies the control section 6 of the end of the process.

Upon receiving the above notification, the control section 6 instructs the output section 7 to output the wiring route written in the temporary storage section 5.

When the control section 6 receives the notification of the end of output from the output section 7, it instructs the input section 4 to read the secondary wiring designation information.

Assume that this newly read wiring designation information is a signal line whose start and end points are grid points B1 and B7, respectively, as illustrated in FIG. in this case.

The signal line processing unit 2 processes grid points Bl, B2 . A new wiring route B that connects B2' to B7'' and B7 is set. Also, the non-signal line processing unit 3 secures grid points bl to b6 as new non-signal line grid points. Since grid points B3 to B6 have already been secured as grid points for non-signal lines, they are not secured again.

The control unit 4 is newly written to the temporary storage unit 5.
! When detecting that the wiring type information in the wiring designation information is related to a non-signal line, the non-signal line processing unit 3 is caused to start wiring processing for the non-signal line.

The non-signal line processing unit 3 that has started the process reads the start and end point data from the temporary storage unit 5, and while referring to the grid point usage status in the grid point information storage unit 1, the non-signal line processing unit 3 reads out the start and end point data from the temporary storage unit 5, and while referring to the grid point usage status in the grid point information storage unit 1, Set the shortest non-signal line wiring route that connects the secured grid points. The non-signal line processing unit 3 writes the set wiring route of the non-signal line into the temporary storage unit 5, updates the grid point usage status data in the grid point information storage unit 1, and notifies the control unit 6 of the end of the process. .

The example shown in Figure 4 assumes a case of multilayer wiring.

The wiring areas secured as non-signal lines are grid points B3 and 86.
The line connecting B2 and 87 is allowed to become an isolated line segment on the layer shown in the figure, but in order to allow connection with other non-signal lines on the layer shown in the figure, the line connecting B2 and 87. For example, a wiring area longer than the signal line may be reserved for wiring of non-signal lines.

Furthermore, since there is little possibility that two meandering signal lines will be parallel to each other over a long section, a configuration may be adopted in which grid points for non-signal lines are secured only when a straight portion of a predetermined length or more appears in the signal line.

Furthermore, although we have illustrated a configuration in which wiring settings are performed by mixing signal lines and non-signal lines, it is also possible to first configure wiring settings for only signal lines, and then configure wiring settings only for non-signal lines, or vice versa. It is also possible to adopt a configuration in which wiring settings for signal lines are performed after wiring settings for non-signal lines. In this case, there is no need to include signal line type information in each individual wiring specification information, and it is possible to use comprehensive wiring type information that allows the system to identify the boundary between signal line groups and non-signal line groups. can.

Effects of the Invention As explained in detail above, the system of the present invention is capable of connecting signal lines by securing grid points for wiring power lines and grounding lines between signal lines and non-signal lines having a constant potential. Since the structure avoids the adjacency of the three signal lines, there is no need to spend a great deal of effort and time manually changing the wiring in order to prevent interference between the three signal lines.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a conceptual diagram showing an example of the configuration of wiring grid point information stored in the system of FIG. 1, and FIG. Figure 4 is a conceptual diagram showing an example of the configuration of wiring specification information input to the system shown in Figure 4. Figure 4 is a conceptual diagram for explaining the operation of the system shown in Figure 1. Figure 5 is a wiring setting method using the conventional system. It is a conceptual diagram for explaining a problem. 1. Grid point information storage unit, 2. Signal line processing unit. 3. Non-signal line processing section, 4. Human power section, 5. Temporary storage section, 6. Control section, 7. Output section.

Claims (1)

[Claims] Whether the wiring grid point group is unused, used for signal wiring, non-signal wiring, or reserved for non-signal wiring. storage means for storing grid point information for wiring including the usage status of the wire; information on the start and end points of a wire to be set by connecting a part of the group of grid points for wiring; and information on whether the wire is a signal line or a non-signal line. If wiring instruction information including wiring type information that individually or comprehensively indicates whether the wire is a wire is accepted, and the wiring type information in the accepted wiring designation information is a signal line, the wiring in the storage means is determining a new wiring route so as to connect the unused wiring grid points with reference to the wiring grid point information;
If the wiring grid point adjacent to the determined wiring route is unused, it is reserved for wiring a non-signal line, and if the wiring type information in the accepted wiring specification information is a non-signal line, , determine a new wiring route so as to connect the unused wiring grid points or the wiring grid points reserved for wiring of non-signal lines with reference to the wiring grid point information in the storage means; A wiring design system using CAD, further comprising means for updating wiring grid point information in the storage means with information on newly determined wiring routes.