JPH05174088A - Circuit diagram preparing device - Google Patents

Abstract

PURPOSE:To realize a circuit diagram generating device which can prepare simply an easily understandable circuit diagram. CONSTITUTION:A circuit diagram information generating means 20 is provided with a wiring attribute adding means 24 for adding as an attribute such as, for instance, R=10OMEGA, C=5muF instead of arranging one by one a parasitic element (parasitic resistor, capacitor) provided on a wiring between function blocks and a circuit diagram information output means 26 for outputting circuit diagram information 102a for adding the wiring attribute in such a manner. Also, the means may include an automatic parasitic element arranging means 27 and a real circuit diagram information output means 28 for generating and outputting real circuit diagram information 103 necessary for the arrangement of the parasitic element. Accordingly, the labor and time for arranging one by one the parasitic element are saved, and also, it does not occur that the parasitic element is mistaken for the factor element, and an easily understandable drawing is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in computer-aided design (CAD) for designing electronic circuits using a computer, and more particularly to a circuit diagram drawing device for integrated circuits.

[0002]

2. Description of the Related Art Conventionally, in creating a circuit diagram for manufacturing an integrated circuit, circuit diagram creating software (circuit diagram editor)
Is widely used. By using the circuit diagram creation method in these circuit diagram editors, it is possible to create a circuit diagram composed of functional blocks and circuit elements and wirings for connecting them. In this case, the wiring that connects the blocks and circuit elements should have electrical ideal characteristics, and the intended circuit diagram should be created without considering the actual electrical properties of the wiring. . Also, in order to express the actual electrical properties of the wiring in the circuit diagram,
Functional blocks and circuit elements that express their properties are explicitly shown in the circuit diagram.

FIG. 4 is a block diagram showing a main part of such a conventional circuit diagram creating apparatus. This conventional example includes circuit diagram information creating means 30 for inputting circuit diagram design data 101 and creating and outputting circuit diagram information 102, and an auxiliary storage device 40. Then, the circuit diagram information creating means 30
It includes block placement means 31, wiring means 32, element attribute addition means 33, parasitic element placement means 34, parasitic element attribute addition means 35, rule check means 36, and circuit diagram information output means 37.

Next, the operation of this conventional example will be described with reference to the flow chart shown in FIG.

First, the element / block arranging means 31 inputs the circuit diagram design data 101 to arrange element elements and functional blocks (step S11). Next, the wiring means 32 performs wiring between elements and blocks, and input / output wiring (steps S12 and S13). Then, the element attribute adding means 33 adds an attribute to the element (step S14), the parasitic element arranging means 34 arranges the parasitic element of the wiring (step S15), and the parasitic element attribute adding means 35 arranges each element. An attribute is added to the parasitic element (step S16). Then, the rule check means 36 performs a rule check (step S17), and finally the circuit diagram information output means 37 outputs the circuit diagram information 102 (step S18).

FIG. 6 is a circuit diagram showing an example of the circuit diagram information 102 thus created.

In FIG. 6, the functional block 1 inputs an input signal from the input wirings 7 and 8 and outputs an output signal to the inter-block wirings 4 and 5. The inter-block wiring 4 is connected to the functional block 2 for transmitting an input signal, and the inter-block wiring 5 is connected to the functional block 3 for transmitting an input signal. The functional block 3 inputs an input signal from the inter-block wiring 5 and the input wiring 9, and outputs an output signal to the inter-block wiring 6. The inter-block wiring 6 is connected to the functional block 2 for transmitting an input signal. The functional block 2 inputs an input signal from the inter-block wirings 4 and 6 and outputs an output signal to the output wiring 10.

Here, the inter-block wirings 4, 5 and 6 are provided.
Since the parasitic resistance and capacitance of is explicitly shown in the circuit diagram,
A parasitic resistance 11 and a parasitic capacitance 12 are connected to the inter-block wiring 4, and a resistance value of 10Ω and a capacitance value of 5 μF are added as attributes, which are indicated by arrows drawn for the respective elements. Has been done. Similarly, a parasitic resistance 13 and a parasitic capacitance 14 are connected to the inter-block wiring 5, a resistance value of 8Ω and a capacitance value of 15 μF are respectively added, and a parasitic resistance 15 and a parasitic capacitance 16 are added to the inter-block wiring 6. Are connected, and a resistance value of 15Ω and a capacitance value of 2 μF are added respectively.

Further, it is possible to automatically create an input to software (circuit simulator) for verifying whether the circuit operates correctly from the created drawing.

[0010]

In the current miniaturized integrated circuits, the resistance value and capacitance value of the wiring cannot be ignored. For example, in the case of an analog circuit, the electrical properties of each device and the wiring change depending on the location of the wiring, so that the information must be predicted and added at the stage of creating a circuit diagram. . Therefore, correct verification (circuit simulation) cannot be performed with a circuit diagram in which functional blocks are simply connected by wiring.

However, in the preparation of a circuit diagram using the conventional circuit diagram preparation device, the electrical properties of the wiring are explicitly shown in the circuit diagram, and therefore, as shown in the example of FIG. However, there is a drawback that it takes a lot of time to arrange and connect the necessary wiring.

Further, it is difficult to determine whether the element connected to the wiring exhibits the function of the circuit or the electrical property of the wiring, and it is difficult to understand the circuit diagram so that the circuit operates correctly. There is a drawback in that unnecessary consideration must be taken in creating a circuit diagram for this purpose.

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit diagram creating device which can easily create a circuit diagram which is easy to understand by eliminating the above-mentioned drawbacks.

[0014]

According to the present invention, there is provided a circuit diagram creating device comprising circuit diagram information creating means for receiving circuit diagram design data, creating a circuit diagram, and outputting circuit diagram information. Is characterized in that it includes means for adding a parasitic element included in the inter-block wiring connecting the functional blocks in the circuit diagram as an attribute and outputting it as the circuit diagram information.

[0015]

According to the present invention, the parasitic elements (parasitic resistance, capacitance) of the inter-block wiring have the attribute (sign and value of resistance and capacitance) of the inter-block wiring without arranging the parasitic element. Display is performed by indicating with an arrow.

As a result, the circuit diagram becomes easy to see, and the parasitic elements are not mistaken for the element elements.

When the actual drawing information in which the parasitic elements are arranged for another tool is required, the parasitic elements can be automatically arranged by the attribute added to the circuit diagram information.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the essential parts of an embodiment of the present invention.

In this embodiment, circuit diagram design data 101 is input to create a circuit diagram and circuit diagram information 102a is output. In the circuit diagram creating device including the circuit diagram information creating device 20 including the device / block arranging device 21, the wiring device 22, the device attribute adding device 23, and the rule checking device 25, the features of the present invention are provided. On the other hand, the circuit diagram information creating means 20 adds wiring attributes as means for adding parasitic elements included in the inter-block wiring connecting the functional blocks in the circuit diagram as attributes and outputting as circuit diagram information. Means 24 and circuit diagram information output means 26, and further, actual circuit diagram information for other tools in which the parasitic element is arranged based on the attribute added to the inter-block wiring in the output circuit diagram information. Parasitic element automatic placement means 27 as means for creating and outputting 103
And an actual circuit diagram information output means 28.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

First, the element / block arranging means 21 inputs the circuit diagram design data 101 to arrange element elements and functional blocks (step S1). next,
Wiring means 22 performs wiring between elements and blocks, and input / output wiring (step S2). Then, the element attribute adding means 23 adds an attribute to the element (step S
4) The attribute of the parasitic element of the wiring is added to the wiring between blocks by the wiring attribute adding means 24 (step S).
5). Thereafter, the rule checking means 25 performs a predetermined rule check (step S6), and the circuit diagram information output means 26 outputs the geometric circuit diagram information 102a whose creation has been checked (step S7).

Then, this geometrical circuit diagram information 102
When a is changed to the actual circuit diagram information 103 for another tool, the parasitic element automatic placement means 27 causes the circuit diagram information 10
The parasitic elements are automatically arranged based on the attributes of the parasitic elements added to the inter-block wiring of 2a (steps S8, S
9), the actual circuit diagram information 103 for another tool in which the parasitic element is arranged is output (step S10).

FIG. 3 is a circuit diagram showing an example of the circuit diagram information 102a created in this way.

Similar to FIG. 6 described in the conventional example, the functional block 1 inputs an input signal from the input wirings 7 and 8 and outputs an output signal to the inter-block wirings 4 and 5. The inter-block wiring 4 is connected to the functional block 2 for transmitting an input signal, and the inter-block wiring 5 is connected to the functional block 3 for transmitting an input signal. The functional block 3 inputs an input signal from the inter-block wiring 5 and the input wiring 9, and outputs an output signal to the inter-block wiring 6. The inter-block wiring 6 is connected to the functional block 2 for transmitting an input signal. The functional block 2 inputs an input signal from the inter-block wirings 4 and 6 and outputs an output signal to the output wiring 10.

The inter-block wiring 4 has "R = 1".
The fact that “0Ω, C = 5 μF” is added as an attribute of the wiring is indicated by the arrow drawn to the inter-block wiring 4. Similarly, for the inter-block wiring 5,
= 8Ω, C = 15 μF ”, and the inter-block wiring 6 has“ R
= 15Ω, C = 2 μF ”is added as an attribute of the wiring by the arrow.

As is apparent from FIG. 3, in the circuit diagram information 102a according to the present embodiment, since the parasitic element of the inter-block wiring is added as an attribute without actually arranging it, an easy-to-read circuit diagram can be obtained. In addition, the parasitic element is not mistaken for the element element.

[0028]

As described above, according to the present invention,
By eliminating the trouble of arranging and wiring the circuit diagram information that makes the distinction between the part that determines the operation of the circuit and the part parasitic to the wiring clear and easy to understand, parasitic elements as elements in the circuit diagram, It can be created easily and its effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation.

FIG. 3 is a circuit diagram showing an example of circuit diagram information 102a.

FIG. 4 is a block diagram showing a main part of a conventional example.

FIG. 5 is a flowchart showing the operation.

FIG. 6 is a circuit diagram showing an example of the circuit diagram information 102.

[Explanation of symbols]

 1, 2, 3 Functional blocks 4, 5, 6 Inter-block wiring 7, 8, 9 Input wiring 10 Output wiring 11, 13, 15 Parasitic resistance 12, 14, 16 Parasitic capacitance 20, 30 Circuit diagram information creation means 21, 31 Element / block arranging means 22, 32 Wiring means 23, 33 Element attribute adding means 24 Wiring attribute adding means 25, 36 Rule checking means 26, 37 Circuit diagram information outputting means 27 Parasitic element automatic arranging means 28 Actual circuit diagram information outputting means 34 Parasitic element arranging means 35 Parasitic element attribute adding means 40 Auxiliary storage device 101 Circuit diagram design data 102, 102a Circuit diagram information 103 Actual circuit diagram information S1 to S10, S11 to S18 Steps

Claims (2)

[Claims] 1. A circuit diagram creating apparatus comprising circuit diagram information creating means for inputting circuit diagram design data, creating a circuit diagram, and outputting circuit diagram information, wherein the circuit diagram creating means is a functional block in the circuit diagram. A circuit diagram creating apparatus comprising means for adding a parasitic element included in the inter-block wiring connecting between the elements as an attribute and outputting it as the circuit diagram information. 2. The circuit diagram creation device according to claim 1, wherein the output circuit diagram information is input, and the parasitic element is arranged based on the attribute added to the inter-block wiring. A circuit diagram creation device comprising means for creating and outputting information.