JP2789886B2 - Interactive unconnected net correction layer selection method for multilayer wiring board - 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 connection processing method for a multilayer wiring board or the like, and more particularly to a method of selecting a pair layer for performing wiring processing on a net which has not been connected yet and remains.

[0002]

2. Description of the Related Art A conventional method for selecting an unconnected net correction layer of a multilayer wiring board includes a means for inputting parameters required for wiring such as a wiring order and an allowable wiring length of the unconnected net, and a wiring area for the unconnected net. Means for interactively selecting and changing the pair layer of the determined unconnected net wiring area and displaying the result, and inputting the result of whether or not to wire the unconnected net in the displayed pair layer It has means for branching the processing, means for performing an interactive wiring process to wire unconnected nets, and means for checking whether wiring has been completed for all unconnected nets and branching the processing.

Next, a conventional technique will be described with reference to the drawings.

FIG. 4 is a partially enlarged view of a first pair layer near an unconnected net terminal according to the prior art.

In FIG. 4, an unconnected net starting point terminal 11 is shown.
And the unconnected net terminal terminal 12 are present in the area 41 near the unconnected net terminal. The first pair layer Y-direction wiring 27 and the first pair layer X-direction wiring 28 also exist inside the unconnected net terminal vicinity area 41.

FIG. 5 is a wiring image diagram of a multilayer wiring board showing a conventional technique.

In FIG. 5, a first pair layer Y direction wiring layer 2
1 and the first pair layer X-direction wiring layer 22 constitute a first pair layer. In the first pair layer, the channel utilization rate is partially high in the right part of the multilayer wiring board, in the second pair layer, in the center part of the multilayer wiring board, and in the third pair layer, the left part of the multilayer wiring board is partially high.

FIG. 6 is a flowchart showing a conventional processing operation.

In FIG. 6, a processing box 61 to a branch box 66 show a conventional processing operation.

The processing operation of the prior art will be described with reference to FIGS.

First, parameters required for wiring, such as the wiring order of unconnected nets and the allowable wiring length, are input. (Processing box 61) Next, the vicinity of the unconnected net start terminal 11 and the unconnected net end terminal 12 is set to the area 41 near the unconnected net terminal.
And enlarge the display. (Processing box 62) Next, the selection and change of the pair layer of the area 41 near the unconnected net terminal which is enlarged and displayed are interactively displayed. (Processing Box 63) Next, the degree of congestion of the displayed pair layer is visually and intuitively grasped, and the result of determining whether or not to wire an unconnected net is input. When the wiring of the unconnected net is not performed, the process returns to the processing box 63. (Branch box 64)
When the pair layer for wiring the unconnected net is determined, an interactive wiring process is performed to wire the unconnected net. (Processing box 65) Next, it is checked whether or not the wiring processing has been completed for all the unconnected nets. If the wiring processing has not been completed, the process returns to the processing box 62. When the wiring processing of the unconnected net is completed, the process ends. (Branch box 66)

[0012]

In the conventional method of selecting an unconnected net correction layer for a multi-layered wiring board interactively, a pair layer to be displayed interactively is selected to determine a wiring pair layer of the unconnected net. In order to visually grasp the degree of congestion of the displayed pair layer and determine whether or not to wire the unconnected net, a great deal of man-hours are required to select and determine the wiring pair layer of the unconnected net. And there is a high possibility that the judgment is wrong.

[0013]

According to the present invention, there is provided an interactive method for selecting an unconnected net correction layer of a multilayer wiring board. The method includes the steps of: inputting parameters required for wiring, such as the wiring order and allowable wiring length of unconnected nets; Means for determining the wiring area of the unconnected net in accordance with the wiring order of the unconnected net, and means for determining the channel usage rate of the obtained wiring area of the unconnected net for all pair layers. A means for interactively displaying a wiring area of an unconnected net in order from the pair layer, a means for inputting a determination result as to whether or not to wire the unconnected net in the displayed pair layer, and a means for branching processing, and an interactive wiring Means for performing processing and wiring unconnected nets, and means for checking whether wiring has been completed for all unconnected nets and branching the processing. That.

[0014]

The channel utilization rate in the wiring area of each unconnected net is determined, and it is determined whether or not to perform wiring in the order of the pair layer with the lowest channel utilization rate, based on the wiring order of each net, and the wiring processing is performed. Go.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partially enlarged view of an unconnected net wiring region in an embodiment of the present invention.

In FIG. 1, an unconnected net starting point terminal 11
And the unconnected net end terminal 12 are connected to the unconnected net wiring area 1
3 exists inside. The third pair layer Y-direction wiring 14
And third pair layer X-directional wiring 15 are connected to third pair layer via 16
Is connected.

FIG. 2 is a wiring image diagram of the multilayer wiring board of the embodiment shown in FIG.

In FIG. 2, the first pair layer Y direction wiring layer 2
1, the first pair layer Y-direction wiring 27 is wired.
The first pair layer X direction wiring 28 is wired in the pair layer X direction wiring layer 22. Further, the second pair layer Y direction wiring 29 is wired in the second pair layer Y direction wiring layer 23, and the second pair layer X direction wiring 30 is wired in the second pair layer X direction wiring layer 24. The third pair layer Y-direction wiring layer 25 is
The pair layer Y direction wiring 14 is wired, and the third pair layer X
The third pair layer X direction wiring 15 is wired in the direction wiring layer 26. In all of these six wiring layers, there is an unconnected net wiring area 13 having a common size.

In FIG. 3, a processing box 31 to a branch box 37 show the processing operation of one embodiment of the present invention.

The processing operation of one embodiment of the present invention will be described with reference to FIGS.

First, parameters necessary for wiring, such as the wiring order and the allowable wiring length of all unconnected nets, are input.

After that, normal automatic wiring processing is performed. As a result, the present invention is for performing interactive wiring processing on unconnected nets that have not been connected and remain unconnected. The wiring order of the unconnected net is determined based on a certain rule as described above when performing the automatic wiring processing. (Processing Box 31) Next, in FIG.
The wiring area 13 of the unconnected net is determined according to the input wiring order of the unconnected net. Unconnected net wiring area 13
Is a common size for each wiring layer, and takes into account the allowable wiring length input in the processing box 31, and calculates and obtains a region that can maintain the allowable wiring length even when the detour wiring is performed. The wiring area 13 of the obtained unconnected net has an octagon as shown in FIG. (Processing Box 32) Further, in FIG. 2, the channel utilization rates of the obtained unconnected net wiring regions 13 are obtained for all the pair layers. The channel usage rate is a numerical value indicating the degree of wiring congestion. When all the wiring channels are used, the channel usage rate is 100%. (Processing box 33) Next, the unconnected net wiring areas 13 are displayed interactively in order from the pair layer having the lowest channel utilization rate. Based on the above-described wiring order of each net, by sequentially selecting from the pair layers having the lowest channel usage rates in the unconnected net wiring area 13 as much as possible, it is possible to move and correct the already connected wiring. At a minimum, wiring of unconnected nets can be performed as easily as possible. FIG. 1 shows an image in which the unconnected net wiring area 13 of the third pair layer having the lowest channel usage rate is displayed. (Processing box 34) In the branching box 35, a determination result as to whether or not wiring of the displayed unconnected net of the pair layer is to be inputted. Here, the operator makes an estimate of the number of wires to be moved which are already connected in order to wire the unconnected net. Even when the channel usage rate is slightly high, the number of wires already connected may be small when wiring an unconnected net, and the determination may not be possible only based on the channel usage rate. When the wiring of the unconnected net is not performed in consideration of the above factors, the process returns to the processing box 34. (Branch Box 35) Next, after selecting and determining a pair layer for wiring an unconnected net, interactive wiring processing is performed to wire the unconnected net. (Processing box 36) Next, it is checked whether or not the wiring processing has been completed for all the unconnected nets. If the wiring processing has not been completed, the process returns to the processing box 32 and the next processing is performed in accordance with the wiring order of the already input unconnected nets. Of obtaining the wiring area 13 of the unconnected net is repeated. When the wiring processing of all the unconnected nets is completed, the process ends. (Branch box 37)

[0024]

As described above, according to the present invention, in the interactive wiring processing of the unconnected net of the multilayer wiring board, the channel utilization rate of the wiring area of the unconnected net is obtained for all the pair layers, and the wiring of each net is determined. The wiring area of the unconnected net is displayed interactively in order from the pair layer with the lowest channel utilization rate, assuming the order, so that the selection and determination of the wiring pair layer of the unconnected net can be performed quickly and accurately. This has the effect of making a decision.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of an unconnected net wiring region in an embodiment of the present invention.

FIG. 2 is a wiring image diagram of a multilayer wiring board in an example of the present invention.

FIG. 3 is a flowchart showing a processing operation of the embodiment of the present invention.

FIG. 4 shows a first example near the unconnected net terminal showing the prior art.
It is the elements on larger scale of a pair layer.

FIG. 5 is a wiring image diagram of a multilayer wiring board showing a conventional technique.

FIG. 6 is a flowchart showing a processing operation of a conventional technique.

[Explanation of symbols]

 11 unconnected net start terminal 12 unconnected net end terminal 13 unconnected net wiring area 14 third pair layer Y direction wiring 15 third pair layer X direction wiring 16 third pair layer via 21 21 first pair layer Y direction wiring layer 22 first pair layer X direction wiring layer 23 second pair layer Y direction wiring layer 24 second pair layer X direction wiring layer 25 third pair layer Y direction wiring layer 26 third pair layer X direction wiring layer 27 first pair layer Y direction wiring 28 First pair layer X direction wiring 29 Second pair layer Y direction wiring 30 Second pair layer X direction wiring 41 Unconnected net terminal area 42 42 Via for first pair layer

Claims (1)

(57) [Claims] 1. A parameter required for wiring such as a wiring order of an unconnected net and an allowable wiring length is input, a wiring area of the unconnected net is obtained according to the input wiring order of the unconnected net, and the obtained wiring of the unconnected net is obtained. The channel utilization rate of the region is obtained for all pair layers composed of two wiring layers in the X direction and the Y direction, and the wiring areas of unconnected nets are displayed interactively in order from the pair layer having the lower channel utilization rate. Enter the result of determining whether or not to wire the unconnected net in the displayed pair layer, perform the interactive wiring process on the unconnected net decided to be connected, and complete the wiring for all the unconnected nets A method of selecting an unconnected net correction layer for an interactive unconnected net of a multilayer wiring board, characterized by examining and performing wiring processing.