JPH06251094A - Circuit simulator - Google Patents

Abstract

PURPOSE:To provide a circuit simulator capable of efficiently performing a design. CONSTITUTION:This simulator is constituted in such a way that a design rule file 4 provided with reference (rule) for distance between elements which apply influence to circuit characteristic and when the element which satisfies the rule exists, distance sampling data D between elements can be sampled from layout pattern data P2 by a distance sampling part 5 between elements. Net list data H2 is sampled from the distance sampling data D between elements and the layout pattern data P2 by a net list sampling part 6, and circuit simulation is performed by a simulation part 8 based on the net list data N2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit simulation device for extracting a netlist from a circuit diagram and performing a circuit simulation based on the netlist.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing a configuration of a conventional circuit simulation device. In the conventional circuit simulation device, the netlist extraction unit 1 extracts the netlist data N ₁ from the circuit diagram data C ₁ held in a file (not shown), and the layout pattern data conversion unit 2 lays out the netlist data N ₁ . The pattern data is converted into pattern data P ₁ , and the layout pattern data correction unit 3 performs correction in consideration of the chip size and the element shape to make the layout pattern data P ₁ layout data P ₂ .

Further, the netlist extraction unit 6 extracts the netlist data N ₂ from the layout pattern data P ₂ , and the circuit diagram conversion unit 7 extracts the netlist data N _2.
Is converted into circuit diagram data C ₂ , and the circuit diagram correction unit 9 corrects the circuit diagram data C ₂ into circuit diagram data C ₃ that reflects the influence on the characteristics generated by the layout pattern arrangement, and extracts the netlist. part 1 by extracting the netlist data N ₃ from the circuit diagram data C _3, and performs circuit simulation by the simulation unit 8 on the basis of the net list data N _3.

[0004]

In the conventional device having the above-mentioned structure, when the influence of the layout pattern on the characteristics to be considered is reflected in the circuit simulation, the distance between the patterns of the layout pattern data P ₂ and The designer individually searched the positional relationship, corrected the points to be considered in the circuit diagram data C ₂ , extracted the final netlist data N ₃ , and performed the circuit simulation. Therefore, the work time is long and the design efficiency is lowered. The present invention has been made in view of such circumstances, and includes a rule file having a rule for extracting predetermined data, and a netlist from the data extracted based on this rule file and the layout pattern data. It is an object of the present invention to provide a circuit simulation device that enables efficient design by extracting data.

[0005]

A circuit simulation device according to a first aspect of the present invention includes a rule file having rules for extracting predetermined data, and means for extracting data satisfying the rules based on the rule file. , And means for extracting netlist data from the extracted data and layout pattern data, and means for performing a circuit simulation based on the netlist data.

A circuit simulation apparatus according to a second aspect of the present invention includes a rule file having a rule for extracting predetermined data, a means for extracting data satisfying the rule based on the rule file, and the extracted data. It is characterized in that it is provided with means for replacing the element that it has with an element having appropriate circuit characteristics, and means for performing circuit simulation based on the data obtained by the means.

[0007]

According to the first aspect of the invention, information such as the width and length of the transmission line, the distance between the elements, and the like, which is obtained from the layout pattern data, is compared with the rules contained in the rule file to determine, for example, the rule. If there is an element with an element interval shorter than the predetermined distance held in the file, the data is extracted, so it is possible to automatically perform the circuit search that was conventionally done by the designer. Design efficiency is improved.

According to the second aspect of the invention, in addition to the effect of the first aspect, the designer automatically replaces the element having the data satisfying the rule of the rule file with the element having the appropriate circuit characteristic. The processing can be reduced and the design efficiency is further improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a block diagram showing a circuit simulation device according to the first invention. This device uses the circuit diagram data C ₁ stored in a file (not shown).
Netlist extraction unit 1 for extracting a net list data N ₁ from the layout pattern data converting unit 2 that converts the net list data N ₁ to the layout pattern data P _1, chip size layout pattern data P _1, the element shape Layout pattern data P ₂
And a layout pattern data correction unit 3 that corrects the layout pattern data. The above configuration is similar to that of the conventional device.

The present invention is provided with the design rule file 4 having a reference (rule) of the distance between the elements which affects the circuit characteristics, and when there is a layout pattern data P ₂ which satisfies this rule. In addition, a distance extraction unit 5 between elements for extracting distance data between the elements.
Is equipped with. More netlist extraction section 6 and the net list data N ₂ from the distance extracting unit 5 and the distance extraction data D between extracted elements by the above-described layout pattern data P ₂ Metropolitan extracts the net list data N ₂ between the elements A simulation unit 8 that performs circuit simulation based on the circuit simulation is provided.

FIG. 2 is a flow chart showing a processing procedure in the apparatus of the present invention having the above-mentioned configuration. First, the designer inputs the layout information of the circuit diagram (S1), and from the circuit diagram data C ₁ having the inputted data, the netlist extracting unit 2
At step S2, the netlist data N ₁ is extracted. Then it converts the net list data N ₁ at the layout pattern data conversion unit 3 to the layout pattern data P ₁ (S3), chip size, layout and correct the layout pattern data P ₁ in consideration of the element shape pattern data P Set to ₂ (S4).

Further, a design rule check for searching the distance between the transmission lines, the distance between the transmission line and the chip end, and the distance between the transmission line and the ground pattern is performed based on the rule contained in the design rule file 4. The distance extraction unit 5 extracts the distance extraction data D between the elements (S5). Distance extraction data D between these elements
And the data of the transmission line attribute list of the layout pattern data P ₂ by the netlist extracting unit 6 to extract the netlist data N ₂ (S6), and the circuit simulation is performed using the netlist data N ₂ (S).
7).

FIG. 3 is a plan view showing a part of a layout diagram in which a transmission line and a ground pattern are arranged on a chip. In a corner surrounded by sides 27a and 27b of chip 27, 23 is a rectangular transmission line arranged in parallel with side 27a, and 25 is a rectangular transmission line arranged in parallel with side 27b, Reference numeral 24 is a right-angled triangular transmission line that connects the transmission line 23 and the transmission line 24 at a right angle. The ground pattern 26 is arranged between the side 27b and the transmission line 25.

FIG. 4 is an explanatory diagram showing each attribute list of the netlist data N ₂ relating to each transmission line 23, 24, 25, in which the distance extraction data D between elements is added to the layout pattern data P _2. is there. The attribute list 23a of the transmission line 23 includes, in addition to the information of the width W ₁ and the length L ₁ of the transmission line 23 obtained from the layout pattern data P _{2, the} side 27a and the transmission line 23 obtained from the distance extraction data D between the elements. It has information such as the distance d _{1 from the} . The attribute list 24a of the transmission line 24 includes information on the length W ₁ of one side other than the oblique side of the transmission line 24 obtained from the layout pattern data P ₂ , the length W ₂ of the remaining one side, and the distance between elements. The distance d ₁ between the side 27a obtained from the extracted data D and one vertex forming an angle other than a right angle, and the distance d between the ground pattern 26 and the remaining one vertex.
_{It has 2nd} grade information. Furthermore attribute list 25a of the transmission line 25, the width W ₂ of the transmission line 25 resulting from the layout pattern data P _2, in addition to the information of the length L _2, transmission to the ground pattern 26 resulting from the distance extraction data D between the elements It has information such as the distance d ₂ to the line 25.

FIG. 5 is a block diagram showing a circuit simulation apparatus according to the second invention. The device of the present invention is
When the netlist data N ₂ shown in FIG. 1 includes a pair of transmission lines that are close to each other and may affect the element characteristics, the netlist data N ₂ is replaced by a circuit diagram data C in which the pair of transmission lines are replaced by a coupled transmission line. a circuit diagram converter 7 to be converted to _2, and a simulation unit 8 that performs circuit simulation based on the circuit diagram data C _2. Also when there is no need to convert the net list data N ₂ is configured to perform the simulation based on the net list data N ₂ similarly to the apparatus shown in FIG.

FIG. 6 is a flow chart showing the processing procedure in the apparatus of the present invention having the above-mentioned configuration. After performing S4 in FIG. 2, a design rule check is performed to search the distance between the transmission lines, the transmission line and the chip end, and the distance between the transmission line and the ground pattern (S5), and this data is used as the transmission line of the layout pattern data P ₂ . Of the netlist data N ₂ extracted from the layout pattern data P ₂ is replaced by the circuit diagram conversion unit 7 to replace a pair of adjacent transmission lines with a coupled transmission line (S 8). Circuit data C ₂ is used. Then, a circuit simulation is performed based on the circuit diagram data C ₂ (S7).

FIG. 7 is a plan view showing a part of a layout diagram in which adjacent transmission lines are arranged on a chip. Figure 7
In the vertical direction (up and down direction), the transmission line 35 is a rectangular transmission line 35 and the transmission line 36 is a right triangle.
37 is connected to the right at a right angle, and a rectangular transmission line 39 is also provided vertically downwards via a transmission line 38 that is also a right triangle.
Are connected. Further, a rectangular transmission line 41 is connected leftward via a right triangle transmission line 40, and a rectangular transmission line 43 is connected vertically downward via a right triangle transmission line 42. Here transmission line 37 and transmission line
41 has substantially the same length and is arranged in parallel with a distance d ₃ therebetween.

FIG. 8A is a conceptual diagram of the circuit diagram data C ₂ obtained when the influence of the transmission line 37 and the transmission line 41 which are close to each other in the layout diagram shown in FIG. 7 is ignored. The transmission lines are connected in series. Figure 8
(b) is a conceptual diagram of the circuit diagram data C ₂ ′ obtained when the above influence is taken into consideration, in which the transmission lines 37 and 41 are replaced by the coupling transmission line 44.

[0019]

As described above, the circuit simulation device according to the present invention is provided with the rule file having the rule for extracting the predetermined data, and by extracting the distance extraction data between the elements satisfying this rule, Since the element that affects the circuit characteristics can be automatically searched, the design can be performed efficiently. Further extracted elements,
By providing means for substituting elements having appropriate circuit characteristics, the processing performed by the designer can be reduced,
Further, the present invention has excellent effects such as improved design efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit simulation device according to a first invention.

FIG. 2 is a flowchart showing a processing procedure in the device of the present invention shown in FIG.

FIG. 3 is a plan view showing a part of a layout diagram.

FIG. 4 is an explanatory diagram showing each attribute list of netlist data N ₂ .

FIG. 5 is a block diagram showing a circuit simulation device according to a second invention.

FIG. 6 is a flowchart showing a processing procedure shown in FIG.

FIG. 7 is a plan view showing a part of a layout diagram in which adjacent transmission lines are arranged.

FIG. 8 is a conceptual diagram of circuit diagram data.

FIG. 9 is a block diagram showing a conventional circuit simulation device.

[Explanation of symbols]

1 Netlist Extraction Section 2 Layout Pattern Data Conversion Section 3 Layout Pattern Data Correction Section 4 Design Rule File 5 Distance Extraction Section between Elements 6 Netlist Extraction Section 7 Circuit Diagram Conversion Section 8 Simulation Section C ₁ , C ₂ Schematic Data N ₁ , N ₂ Netlist data P ₁ , P ₂ Layout pattern data D Distance extraction data between elements

Claims (2)

[Claims] 1. A net is extracted from layout pattern data after extracting netlist data from circuit diagram data having arrangement information of elements, converting the netlist data into layout pattern data, and correcting size and shape. In a circuit simulation device that extracts list data and performs circuit simulation using the netlist data, a rule file having rules for extracting predetermined data, and data satisfying the rule based on the rule file Means to extract,
Means for extracting netlist data from the data extracted by the means and the layout pattern data;
And a means for performing a circuit simulation based on the netlist data. 2. A net from the layout pattern data after extracting netlist data from the circuit diagram data having element placement information, converting the netlist data into layout pattern data once, and correcting the size and shape. In a circuit simulation device that extracts list data and performs circuit simulation using the netlist data, a rule file having rules for extracting predetermined data, and data satisfying the rule based on the rule file Means to extract,
A circuit simulation apparatus comprising means for replacing an element having the data extracted by the means with an element having a required circuit characteristic, and means for performing a circuit simulation based on the data obtained by the means. .