JPH0749896A - Method and device for automatic arranging and wiring - Google Patents

Abstract

PURPOSE:To obtain an automatic arranging and wiring device which precludes defects in layout by forming a layout pattern by using dummy wiring which is wider than prescribed wiring conductor as a power supply wiring and ground wiring, and putting them back to the prescribed wiring width after layout operation. CONSTITUTION:A dummy wiring 17 having conditions for formation using the dummy wiring and a rule file 16 which prescribes normal wiring are connected to an automatic arranging and wiring means 7, which outputs layout data 8 based upon the line width of the dummy wiring. The layout data 8 based upon the line width of the dummy wiring are led to a wiring width changing means 10 and changed in wiring width, and layout data 9 based upon the line width of the normal wiring are outputted. Consequently, wiring intervals can be made wide, so defects in layout can be precluded and the time required for layout pattern generation is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic placement and routing method and an automatic placement and routing apparatus, and more particularly to an automatic placement and routing method and an automatic placement and routing apparatus which prevent a wiring interval error from occurring in a design rule check.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a layout pattern of power supply wiring and ground wiring according to a conventional standard cell method. Capsule 2 provided at one end of each of two standard cells 1 arranged in parallel in FIG. 5 is connected to parallel power supply wiring 3 and ground wiring 4. The automatic placement and routing device is a device for automatically laying out wiring by laying out wiring by CAD based on data determined in designing a semiconductor integrated circuit. FIG. 6 shows a block diagram of a conventional automatic placement and routing apparatus. In FIG.
A rule file 16 that defines a wiring rule for optimizing a wiring width and a wiring interval according to the design data of the circuit, and a layer file 12 that defines a wiring type are connected to the automatic placement and routing means 7, The automatic placement and routing means 7 outputs the layout data 8. The layout data 8 is subjected to a design rule check (hereinafter abbreviated as DRC) 13 and the result is displayed on the display means 15. The layer file 12 and the DRC rule file 14 are connected to the DRC 13. In addition to the rule file 16, a database regarding the circuit structure is connected to the automatic placement and routing means 7, but it is omitted in FIG.

Next, the operation will be described. The layout is performed with normal wiring based on the wiring rule of the rule file 16, but since the semiconductor integrated circuit is complicated, the wiring may be complicated and the wiring interval may be less than the specified wiring distance depending on the location. In this case, when the DRC 13 is executed after the layout is completed, a layout defect will be found. Where D
RC13 is a system for detecting whether or not a layout of a semiconductor integrated circuit conforms to a design rule and detects a violation portion. FIG. 7 shows a layout pattern of the power supply wiring 3 and the ground wiring 4 when the wiring spacing is less than the specified value. In FIG. 7, the spacing between the vertically parallel wirings of the power supply wiring 3 and the ground wiring 4 passing through the two capsules 2 satisfies the regulation, but when both wirings are bent in the horizontal direction, the spacing between the horizontally parallel wirings is large. Becomes narrower. If this interval is S, for example, and the interval S violates the minimum wiring interval regulation of DRC, an error display 5 is displayed on the display means.
Appears. In this case, correct the corresponding part using the CAD tool, execute DRC13 again, and display the error 5
Repeat the correction until is resolved. The larger the circuit, the more the number of places where errors occur, so it takes time to correct.

[0004]

Since the conventional automatic placement and routing apparatus is configured as described above, when the layout is performed at a wiring interval less than the specified value, the DRC 13 is executed to detect the specified violation point. Then, since the relevant part was corrected, there was a problem that it took time and effort.

The present invention has been made in order to solve the above problems, and the power supply wiring 3 and the ground wiring 4 are previously formed by dummy wirings having a width wider than that of the normal wiring, and are returned to the normal wiring after the layout is completed. DRC1
It is an object of the present invention to obtain an automatic placement and routing method and apparatus that prevent the occurrence of errors due to violations.

[0006]

SUMMARY OF THE INVENTION An automatic placement and routing method according to the present invention is a layout pattern of power supply wirings and ground wirings arranged in parallel according to a rule file that defines rules for allocating wirings according to circuit design data. In the step of forming, after forming the layout pattern with a dummy wiring which is a wiring having a wider line width than the normal wiring which is the wiring based on the rule file, the line width of the dummy wiring is set to the line width of the normal wiring. It includes the step of changing.

A first aspect of the automatic placement and routing apparatus according to the present invention is a rule file which defines a rule for allocating wiring according to circuit design data, and a line more than a normal wiring which is a wiring based on the rule file. A dummy wiring file that defines a rule regarding the line width of a dummy wiring that is a wide wiring, and an automatic placement and routing means that automatically creates layout data based on the line width of the dummy wiring based on the rule file and the dummy wiring file. And a wiring width changing means for changing the layout data according to the line width of the dummy wiring to the layout data according to the line width of the normal wiring.

According to a second aspect of the automatic placement and routing apparatus of the present invention, a switching unit for applying the dummy wiring file to the automatic placement and routing unit as needed, and the automatic placement and routing unit in conjunction with the switching unit. Layout data sorting means for sorting the layout data according to the line width of the normal wiring or the line width of the dummy wiring given by.

[0009]

According to the automatic placement and routing method of the present invention, the dummy wiring is changed to the normal wiring after forming the layout pattern with the dummy wiring having a width wider than that of the normal wiring. It is possible to widen the wiring interval between the wiring and the wiring, and it is possible to prevent the occurrence of a layout defect due to the narrow wiring distance.

According to the first aspect of the automatic placement and routing apparatus of the present invention, the rule placement file and the dummy wiring file cause the automatic placement and routing means to output layout data based on the line width of the dummy wiring. Then, by changing the portion of the data relating to the wiring width by the wiring width changing means to make the layout data based on the line width of the normal wiring, the wiring interval can be widened by the amount that the wiring width is narrowed. It is possible to prevent a layout defect from occurring due to a narrow wiring interval.

According to the second aspect of the automatic placement and routing apparatus of the present invention, the file switching means that gives the dummy placement file to the automatic placement and routing means as necessary allows only the rule file or the rule file and the wiring file. Both of them can be given to the automatic placement and routing means, and the automatic placement and routing means can output layout data according to the line width of the normal wiring or the line width of the dummy wiring according to the file. Then, the data is separated by the data separating means, and the subsequent data processing step is performed according to each data, so that it is possible to cope with the case where the dummy wiring is not required.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a first automatic placement and routing apparatus according to the present invention.
It is a block diagram which shows the Example of. In Fig. 1, the wiring width and wiring spacing are optimized according to the circuit design data,
A rule file 16 that defines a wiring rule for efficient wiring, and a dummy wiring file 17 that defines a rule regarding the wiring width of a dummy wiring having a wider line width than the normal wiring, which is the wiring based on the rule file 16. Are connected to the automatic placement and routing means 7. The automatic placement and routing unit 7 outputs layout data 8 based on the line width of the dummy wiring in which only the line width is widened as compared with the layout data 9 based on the line width of the normal wiring. A layer file 12 is also connected to the automatic placement and routing means 7. The layout data 8 according to the line width of the dummy wiring is guided to the wiring width changing means 10,
The wiring width is changed and the layout data 9 according to the line width of the normal wiring is output. A dummy wiring file 17 and a rule file 16 are also connected to the wiring width changing means 10. Layout data 9 depending on the line width of normal wiring is DR
C13 is applied, and the result is displayed on the display unit 15. The layer file 12 and the DRC rule file 14 are connected to the DRC 13.

Next, the operation will be described. In the automatic placement / wiring means 7, by replacing the rule regarding the wiring width of the rule file 16 with the rule defined in the dummy wiring file 17, the line width of the normal wiring is widened at a constant rate, and the wiring width is wider than the normal wiring. Layout data 8 according to the line width of the dummy wiring is created. At this time, the layer file 12
Also gives data for identifying the type of wiring on the CAD screen.

FIG. 2 shows a layout pattern of the power supply wiring 3a and the ground wiring 4a by the dummy wiring. Figure 2
The power supply wiring 3a and the ground wiring 4a connect the capsule cells 2 provided at one end of each of the two standard cells 1 arranged in parallel with each other. This structure is similar to the conventional layout pattern described with reference to FIG. 5, but the wiring width is formed wider than the normal wiring based on the dummy wiring file 17, and the wiring interval is set to the same level as the normal wiring interval. . In this case, the wiring interval when both wirings are bent in the horizontal direction is narrower than the regulation of the DRC 13, and if the DRC 13 is executed as it is, the error display 5 is given. Therefore, in order to return the dummy wiring to the normal wiring, the layout data 8 based on the line width of the dummy wiring is guided to the wiring width changing means 10. The wiring width changing means 10 refers to the dummy wiring file 17 and the rule file 16 and changes the layout data 8 based on the line width of the dummy wiring into the layout data 9 based on the line width of the normal wiring. The layout data 8 according to the width is output as the layout data 9 according to the line width of the normal wiring.

FIG. 3 is a diagram in which the layout pattern of the dummy wiring is changed to the layout pattern of the normal wiring. In FIG. 3, the space between the power lines 3 and the ground lines 4 passing through the two capsules 2 in parallel in the vertical direction is wider than the specified value, and when both lines are bent in the horizontal direction, the interval between the lines in parallel in the horizontal direction is , Will be wider than the conventional interval S of the corresponding portions by α. The value of α is given as the difference in line width between the dummy wiring and the normal wiring. If the wiring distance S + α is equal to or larger than the minimum wiring distance defined by the DRC 13, the error display 5 is not displayed on the corresponding portion of the display unit 15. Since the value of the space α is determined by the wiring width of the dummy wiring, the space α can be arbitrarily adjusted by changing the wiring width of the dummy wiring.

FIG. 4 is a block diagram showing a second embodiment of the automatic placement and routing apparatus according to the present invention. In FIG. 4, a rule file 16 which defines wiring rules for optimizing the wiring width, wiring intervals, etc. according to the design data of the circuit to connect efficiently is connected to the automatic placement and routing means 7 and is based on the rule file 16. A dummy wiring file 17 that defines a rule regarding the wiring width of a dummy wiring, which is a wiring having a line width wider than that of a normal wiring, is connected to the automatic placement / wiring means 7 via the file switching means 18, and the automatic placement / wiring means 7 is connected. Outputs the layout data 8a according to the line width of the normal wiring or the layout data 8 according to the line width of the dummy wiring. The layout data 8 according to the line width of the dummy wiring is data sorting means 19 linked with the file switching means 18.
Is connected to the wiring width changing means 10, and the layout data 8a according to the line width of the normal wiring is directly connected to the DRC1.
3 is connected. Other configurations are similar to those of the first embodiment according to the present invention described with reference to FIG.

Next, the operation will be described. The rule file 16 and the dummy wiring file 17 are connected to the file switching means 18, and only the rule file 16 is given to the automatic placement and wiring means 7, or both the rule file 16 and the dummy wiring file 17 are automatically placed and wired.
Switch to give to. This is for dealing with layout patterns that do not require dummy wiring. In this case, only the data from the rule file 16 is given to the automatic placement and routing means 7, and the automatic placement and routing means 7 outputs the layout data 8a according to the line width of the normal wiring.
The layout data 8a according to the line width of the normal wiring is directly guided to the DRC 13 by the data sorting means 19 which is interlocked with the file switching means 18. On the other hand, when both the data from the rule file 16 and the dummy wiring file 17 are given to the automatic placement and routing means 7, the rule file 16 is provided by the automatic placement and routing means 7 as in the first embodiment described with reference to FIG. By replacing the portion that defines the wiring width of the dummy wiring file 17 with the dummy wiring file 17, the layout data 8 based on the line width of the dummy wiring having a wider wiring width than the normal wiring is created. The layout data 8 according to the line width of the dummy wiring is guided to the wiring width changing means 10 by the data sorting means 19 linked with the file switching means 18. The subsequent operation is similar to that of the first embodiment described with reference to FIG.

[0018]

According to the automatic placement and routing method of the first aspect of the present invention, the wiring interval between the power supply wiring and the ground wiring can be widened, and the narrow wiring interval does not cause any trouble in layout. Therefore, it is possible to save the trouble of correcting the defective portion and reduce the time required to create the layout pattern.

According to the automatic placement and routing apparatus of the second aspect, by adding the dummy wiring file and the wiring width changing means to the conventional automatic placement and routing apparatus, the wiring interval between the power supply wiring and the ground wiring can be widened. Therefore, it is possible to obtain an automatic placement and routing apparatus that can reduce the time required for creating a layout pattern without significantly changing the conventional automatic placement and routing apparatus.

According to the automatic placement and routing apparatus of claim 3, in the automatic placement and routing apparatus of claim 2, the automatic placement and routing apparatus includes a file switching means for giving a dummy wiring file to the automatic placement and routing means, and the switching means. By providing a data separation means for separating layout data in conjunction with each other,
In the case of a layout pattern that does not require dummy wiring, it is possible to obtain an automatic placement and routing apparatus that can create a layout pattern only with normal wiring without converting it into a dummy wiring.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an operation of a first embodiment of an automatic placement and routing apparatus according to the present invention.

FIG. 2 is a diagram showing a layout pattern by the automatic placement and routing apparatus according to the present invention.

FIG. 3 is a diagram showing a layout pattern by the automatic placement and routing apparatus according to the present invention.

FIG. 4 is a configuration diagram showing an operation of the second embodiment of the automatic placement and routing apparatus according to the present invention.

FIG. 5 is a diagram showing a layout pattern by a conventional automatic placement and routing apparatus.

FIG. 6 is a configuration diagram showing an operation of a conventional automatic placement and routing apparatus.

FIG. 7 is a diagram showing a layout pattern by a conventional automatic placement and routing apparatus.

[Explanation of symbols]

 3a Power wiring by dummy wiring 4a Ground wiring by dummy wiring 8 Layout data by dummy wiring 8a, 9 Layout data by normal wiring 10 Wiring width changing means 17 Dummy wiring file 18 File switching means 19 Data sorting means

Claims (3)

[Claims] 1. A step of forming a layout pattern of power supply wirings and ground wirings arranged in parallel according to a rule file that defines rules for allocating wirings according to circuit design data. An automatic placement and routing method comprising: forming the layout pattern with a dummy wiring having a line width wider than that of a certain normal wiring, and then changing the line width of the dummy wiring to the line width of the normal wiring. 2. A rule file that defines a rule for allocating wiring according to circuit design data, and a rule regarding a line width of a dummy wiring that is a wiring wider than a normal wiring that is a wiring based on the rule file. A dummy wiring file that defines the above, and an automatic placement and routing unit that automatically creates layout data based on the line width of the dummy wiring based on the rule file and the dummy wiring file; An automatic placement and routing apparatus comprising: wiring width changing means for changing the layout data according to the wiring line width. 3. A file switching means for applying the dummy wiring file to the automatic placement and routing means as needed, and a line width of the normal wiring or dummy wiring provided by the automatic placement and routing means in cooperation with the switching means. 3. The automatic placement and routing apparatus according to claim 2, further comprising data sorting means for sorting layout data according to line width.