JP2655473B2 - Interactive wiring design method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interactive wiring design method, and more particularly to a method for interactively determining a wiring width and a clearance of a printed circuit board, an IC, an LSI, and the like by CAD.

[0002]

2. Description of the Related Art In a conventional interactive wiring method, as shown in FIG. 3, a designer first specifies a line width and a clearance to be used first (step 31). The CAD calculates the distance between obstacles to be wired (step 32), and determines whether or not wiring with the specified line width and clearance is possible between the obstacles (step 33). If the wiring is possible, the wiring is determined (step 35), and the arrangement is displayed (step 36). If the wiring is not possible, the designer specifies the next line width or clearance (step 37), and again determines whether it is possible to wire the specified line width and clearance between obstacles again (step 37). 34), the processes of steps 33, 34, and 37 were repeated until wiring became possible.

In the automatic wiring method disclosed in Japanese Patent Application Laid-Open No. 60-254786, first, a wiring having a small line width is provided, and then a wiring capable of increasing the line width is made thick.

[0004]

In the conventional interactive wiring method described above, when wiring cannot be performed with the line width and clearance initially specified by the designer, the designer uses any of the following line widths or clearances. I had to specify the next line width or clearance, considering what to do. As described above, in the conventional interactive wiring method, the designer has to repeatedly specify the line width and the clearance until the wiring becomes possible, so that there is a problem that the number of design steps is increased. Also, the conventional automatic wiring method disclosed in Japanese Patent Application Laid-Open No. 60-254786 cannot partially change the clearance to a certain value or less.

[0005]

SUMMARY OF THE INVENTION An interactive wiring design method of the present invention assigns priorities to various line widths and clearances of wiring in advance from large ones, stores the priorities in a priority library, and stores a fault in the target wiring. Calculate the distance between objects, determine whether it is possible to pass between the obstacles for the line width and clearance wiring read out in priority order from the priority library, and when it is determined that it is not possible, again from the priority library to the next The line width and the clearance are read out and the determination is repeated, and the line width and the clearance when it is determined that the line width and the clearance are determined are determined as design values.

[0006]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing contents stored in a computer by an interactive wiring design method according to one embodiment of the present invention. In the present embodiment, a unique I
D, the line width, and the display color are stored. The clearance library 23 stores an ID unique to the clearance, a clearance, and a display line type (solid line, broken line, etc.). The priority library 21 has a line width and a clearance ID.
Are stored in priority order. At that time, the order of the line type and the value of the clearance are set so as to become gradually smaller.

Next, FIG. 1 is a flowchart showing a wiring determination process according to one embodiment of the present invention.

First, the designer stores each information in the line width library 22, the clearance library 23, and the priority library 21 (steps 11, 12, and 13).
CAD calculates the distance between obstacles such as through-hole lands where the wiring whose line width and clearance are to be determined must not be short-circuited (step 14), and the priority library 2
The first line width and clearance in 1 are applied (step 15). Next, it is determined whether or not the wiring having the designated line width and clearance can be passed within the distance between the obstacles previously determined (step 16). If possible, the line width and clearance of the wiring are determined. It is determined (step 18), and the display color and display line type of the determined wiring are displayed (step 1).
9). The designer can know the determined line width and clearance based on the display color and the display line type of the wiring.

If wiring is not possible, the next ID in the priority library is searched, the next line width or clearance is applied (step 20), and it is determined whether wiring is possible (step 16).

Thereafter, steps 16, 16 until the wiring is determined.
Steps 17 and 20 are repeated.

[0012]

As described above, according to the present invention, it is not necessary for the designer to repeatedly check the limit values of the line width and the clearance while repeatedly inputting the line width and the clearance, so that the design man-hour can be reduced. In addition, by storing the priority library in advance, it becomes possible to adopt a line width of a certain rule and a minimum allowable limit, thereby improving the design quality.

[Brief description of the drawings]

FIG. 1 is a diagram showing contents stored in a computer according to an embodiment of the present invention.

FIG. 2 is a flowchart showing one embodiment of the present invention.

FIG. 3 is a flowchart showing a conventional interactive wiring design method.

[Explanation of symbols]

 21 Priority library 22 Line width library 23 Clearance library

Claims (1)

(57) [Claims] 1. Priorities are assigned to prioritized various line widths and clearances of wiring in a priority library and stored in a priority library, and a distance between obstacles passing through a target wiring is calculated. It is determined whether or not the read line width and clearance wiring can pass between the obstacles. If it is determined that the wiring cannot be passed, the next line width and clearance are read again from the priority library and the determination is repeated. An interactive wiring design method characterized in that a line width and a clearance at the time of performing are determined as design values.