JP7355462B1 - Circuit design device, circuit design method, and program - Google Patents

Abstract

The present invention provides a circuit design device that can automatically process unconnected input terminals of components.
A circuit design device includes a circuit diagram generation section, a circuit diagram storage section, and a processing section, and the circuit diagram generation section includes placement information and connection information of each component stored in the circuit diagram storage section. Components are placed on the circuit diagram, and the terminals of the components placed by the circuit diagram generator are stored in a component database that stores component information including the input/output attributes of each terminal and the voltage level of each terminal for each component. If component information is stored that indicates that the output attribute is input and that the voltage level of the terminal of the component is CMOS, the processing unit Performs pull-up connection processing or pull-down connection processing.
[Selection diagram] Figure 1

Description

The present invention relates to a circuit design device, a circuit design method, and a program.

Examples of techniques related to pull-up or pull-down of component terminals in circuit design include the following.

Patent Document 1 relates to an electronic device including an electronic circuit that requires pull-up or pull-down processing during assembly.

Patent Document 2 discloses a semiconductor integrated circuit in which an output terminal of an unused gate for logic change is connected to an open input terminal when the logic signal wiring is cut to change the logic after manufacturing the semiconductor integrated circuit. This relates to repair methods.

Patent Document 3 relates to an automatic circuit design method in which circuit data of a circuit to be designed is automatically generated.

Patent Document 4 relates to an empty input terminal detection circuit that automatically determines an empty input terminal in a CMOS digital IC.

Patent Document 5 relates to a probe termination device for an in-circuit emulator.

Patent Document 6 relates to a circuit diagram input device in a CAD system.

Japanese Patent Application Publication No. 2010-056974 Japanese Patent Application Publication No. 07-078878 Japanese Patent Application Publication No. 06-274558 Japanese Patent Application Publication No. 05-333109 Japanese Patent Application Publication No. 05-257731 Japanese Patent Application Publication No. 03-009478

The following analysis is given by the inventor.

When designing a circuit using a CAD tool, it is recommended to attach a pull-up resistor or a pull-down resistor to an unused input terminal (or input/output terminal set as input) of a component. If the input pins (input terminals) of CMOS technology devices are not connected or wired, circuit operation will become unstable. ) is not disconnected (open). Required pin connection information is defined as one of the attributes of the component library by referring to the component data sheet, etc., and this check prevents problems such as component input terminals remaining open from the circuit design stage. There are techniques to prevent this.

That is, if the input terminal of the component remains open, the following problems may occur.

First, if the input terminal of a component remains open, it may cause malfunction, failure, or destruction of the component. If the input terminal is left open, the output of the circuit having the input terminal becomes unstable, leading to increased current consumption and malfunction due to through current.

Second, it is possible to detect that the input terminal of a component is open by performing a rule check in the CAD system, but the rule check only displays the results as an error report; There is a problem in that a circuit designer must modify the circuit itself by, for example, adding a pull-up resistor or pull-down resistor to a terminal.

An object of the present invention is to provide a circuit design device, a circuit design method, and a program that contribute to automatically processing unconnected input terminals of components.

According to a first aspect of the present invention, a circuit diagram generation section;
a circuit diagram storage unit;
including a processing section;
The circuit diagram generation unit arranges components on a circuit diagram containing placement information and connection information of each component stored in the circuit diagram storage unit,
The input/output attributes of the terminals of the component arranged by the circuit diagram generation unit are input in a component database that stores component information including the input/output attributes of each terminal and the voltage level of each terminal for each component. , and if component information indicating that the voltage level of the terminal of the component is CMOS is stored, the processing section generates a pull voltage for the terminal of the component on the circuit diagram. A circuit design device that performs up connection processing or pull down connection processing can be provided.

According to a second aspect of the invention, executed by a computer,
placing the components on a circuit diagram including placement information and connection information for each component;
Indicates that the input/output attribute of the terminal of the arranged component is input in a component database storing component information including the input/output attribute of each terminal and the voltage level of each terminal for each component, and If component information indicating that the voltage level of the terminal of the component is CMOS is stored, perform a pull-up connection process or a pull-down connection process for the terminal of the component on the circuit diagram. A circuit design method including: The method is tied to a specific machine, a computer, which performs the circuit design method.

According to the third aspect of the present invention, the computer:
A process of placing components on a circuit diagram that includes placement information and connection information for each component;
Indicates that the input/output attribute of the terminal of the arranged component is input in a component database storing component information including the input/output attribute of each terminal and the voltage level of each terminal for each component, and If component information indicating that the voltage level of the terminal of the component is CMOS is stored, performing pull-up connection processing or pull-down connection processing on the terminal of the component on the circuit diagram; program, can be provided.

Note that these programs can be recorded on a computer-readable storage medium. The storage medium can be non-transient, such as a semiconductor memory, a hard disk, a magnetic recording medium, an optical recording medium, or the like. The invention can also be implemented as a computer program product.

According to the present invention, it is possible to provide a circuit design device, a circuit design method, and a program that contribute to automatically processing unconnected input terminals of components.

1 is a diagram showing an example of the configuration of a circuit design apparatus according to an embodiment of the present invention. 1 is a diagram showing an example of the configuration of a circuit design apparatus according to a first embodiment of the present invention. It is a figure showing an example of parts information stored in a parts database of a 1st embodiment of this invention. 3 is a flowchart illustrating an example of the operation of the circuit design apparatus according to the first embodiment of the present invention. FIG. 3 is a diagram showing an example of a circuit diagram generated by the circuit diagram generation unit according to the first embodiment of the present invention. FIG. 3 is a diagram showing an example of pull-up connection processing according to the first embodiment of the present invention. FIG. 3 is a diagram showing an example of pull-down connection processing according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a process of determining the connection of a CMOS input terminal according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a process of determining the connection of a CMOS input terminal according to the first embodiment of the present invention. FIG. 6 is a diagram illustrating an example of a process for deleting the result of pull-up connection process for a CMOS input terminal according to the first embodiment of the present invention. FIG. 7 is a diagram showing an example of pull-up connection processing according to the second embodiment of the present invention. FIG. 7 is a diagram showing an example of pull-down connection processing according to the second embodiment of the present invention. 1 is a diagram showing an example of the configuration of a computer constituting the circuit design apparatus of the present invention.

First, an overview of an embodiment of the present invention will be described with reference to the drawings. Note that the drawing reference numerals added to this summary are added to each element for convenience as an example to aid understanding, and are not intended to limit the present invention to the illustrated embodiment. Furthermore, connection lines between blocks in the drawings and the like referred to in the following description include both bidirectional and unidirectional connections. The unidirectional arrows schematically indicate the main signal (data) flow, and do not exclude bidirectionality.

FIG. 1 is a diagram showing an example of the configuration of a circuit design apparatus according to an embodiment of the present invention. Note that the circuit design device according to an embodiment of the present invention may be realized on a terminal installed with circuit design CAD (Computer Aided Design) software. Referring to FIG. 1, a circuit design apparatus 100 according to an embodiment of the present invention includes a circuit diagram generation section 200, a circuit diagram storage section 300, and a processing section 400.

The circuit diagram generation unit 200 arranges components on a circuit diagram that includes placement information and connection information for each component stored in the circuit diagram storage unit 300. When components are placed on the circuit diagram by the circuit diagram generation unit 200, the circuit diagram generation unit 200 refers to the component database 500 and generates component information for each component, including the input/output attributes of each terminal and the voltage level of each terminal. Indicates that the input/output attribute of the terminal of the component placed by the circuit diagram generation unit 200 is input in the component database 500 storing the component, and indicates that the voltage level of the terminal of the component is CMOS. If component information is stored, the processing unit 400 performs pull-up connection processing or pull-down connection processing on the terminals of the component on the circuit diagram. Note that in FIG. 1, the component database 500 is placed outside the circuit design apparatus 100, but it may be placed inside the circuit design apparatus 100.

According to an embodiment of the present invention, by automatically processing unconnected input terminals of components, open states of CMOS voltage level input terminals can be prevented, improving reliability of circuit design. can do.

Therefore, according to one embodiment of the present invention, it is possible to provide a circuit design device that contributes to automatically processing unconnected input terminals of components. Further, according to an embodiment of the present invention, reliability of circuit design can be improved by automatically processing unconnected input terminals of components.

[First embodiment]
Next, a circuit design apparatus according to a first embodiment of the present invention will be described with reference to the drawings. Note that the circuit design device according to the first embodiment of the present invention may be realized on a terminal installed with circuit design CAD (Computer Aided Design) software. FIG. 2 is a diagram showing an example of the configuration of the circuit design apparatus according to the first embodiment of the present invention. In FIG. 2, components with the same reference numerals as in FIG. 1 indicate the same components.

Referring to FIG. 2, the circuit design apparatus 100 according to the first embodiment of the present invention includes a circuit diagram generation section 200, a circuit diagram storage section 300, and a processing section 400. The processing unit 400 is connected to a component database 500 that stores component information including input/output attributes of each terminal and voltage level of each terminal for each component. The circuit diagram storage section 300 is connected to the circuit diagram display section 600, and the circuit diagram display section 600 displays the circuit diagram stored in the circuit diagram storage section 300 as an image. The circuit diagram generation unit 200 is configured by a circuit designer to place components on a circuit diagram, connect the terminals of the components, and connect a pull-up resistor from the input terminal of the component to the VCC level, or from the input terminal of the component to the GND level. Includes the ability to place a pull-down resistor that connects to a level.

FIG. 3 is a diagram showing an example of parts information stored in the parts database according to the first embodiment of the present invention. Referring to FIG. 3, component information 550 stored in the component database 500 includes component name 551, pin number 552, pin name 553, IO attribute (input/output attribute) 554, input voltage 555, required connection 556, pin type 557 , an example including voltage levels 558 is shown. Note that the pin number 552 and pin name 553 may also be referred to as the terminal number 552 and terminal name 553 below.

FIG. 4 is a flowchart of an example of the operation of the circuit design apparatus according to the first embodiment of the present invention. Referring to FIG. 4, the operation of the circuit design apparatus according to the first embodiment of the present invention will be described below. Operation begins in step S1000.

Next, in step S1001, the circuit designer places components on the circuit diagram or connects the components. Referring to FIG. 2, the circuit diagram generation unit 200 receives a component placement and connection instruction 110 from a circuit designer, and creates a circuit diagram that includes placement information and connection information for each component stored in the circuit diagram storage unit 300. By sending the placement and connection instruction 120, the components are placed or the components are connected. When the circuit diagram generation unit 200 places a component on the circuit diagram, it notifies the processing unit 400 of the component placement via the connection 126. When components have been connected on the circuit diagram, the circuit diagram generating section 200 notifies the processing section 400 via the connection 126 that the components have been connected.

Next, in step S1002, if the circuit designer places components on the circuit diagram (S1002Y), the process advances to step S1003. If the circuit designer connects the components on the circuit diagram (S1002N), the process advances to step S1007.

Note that, as an example, the circuit diagram generation unit 200 is connected to the circuit diagram display unit 600 via the connection 125, and displays components to be placed on the circuit diagram display unit 600 together with the circuit diagram stored in the circuit diagram storage unit 300. , a connection line, a pull-up resistor connected to the VCC level, or a pull-down resistor connected from the input terminal of the component to the GND level, etc. may be displayed. The circuit designer selects components, connection lines, pull-up resistors, pull-down resistors, etc. displayed on the circuit diagram display section 600 using a mouse, input pen, etc. connected to the circuit diagram generation section 200. Component placement and connection instructions 110 are sent to the circuit diagram generation unit 200 by dragging and placing them onto the circuit diagram and connecting the components placed on the circuit diagram using a mouse, input pen, etc. The circuit diagram generation unit 200 can be configured to input the information and generate the circuit diagram.

FIG. 5 is a diagram showing an example of a circuit diagram generated by the circuit diagram generation unit 200 according to the first embodiment of the present invention. Referring to FIG. 5, the circuit diagram generation unit 200 generates a circuit diagram 10 in which the components 20 having the terminals 21 are arranged, and the circuit diagram 10 is displayed as an image on the circuit diagram display unit 600. FIG. 5 shows an image when the circuit diagram 10 in which the components 20 are arranged, which is stored in the circuit diagram storage unit 300, is displayed on the circuit diagram display unit 600. In the following description, the drawing showing the circuit diagram 10 shows an image when the circuit diagram 10 stored in the circuit diagram storage section 300 is displayed on the circuit diagram display section 600.

Next, in step S1003, the processing unit 400 refers to the component database 500 regarding the terminals 21 of the components 20 arranged in the circuit diagram 10.

Note that the component 20 arranged on the circuit diagram 10 shown in FIG. 5 is identified, for example, by the component name 551 of the component information 550 shown in FIG. It can be identified by the pin number 552 of the information 550. The component database 500 stores component information indicated by a row 559 in which the component name 551 is CPU0001, the pin number 552 is F12, and the voltage level 558 is CMOS. In the first embodiment of the present invention, it is assumed below that the component name of the component 20 is CPU0001, and the terminal 21 is a terminal with pin number F12 of CPU0001.

In step S1004, the input/output attribute (IO information attribute) of the terminal 21 of the component 20 is determined with reference to the component database 500. The input/output attribute (IO information attribute) of the terminal 21 of the component 20 is "INTPUT" such as OUTPUT, BIDIRECT, POWER, GROUND, etc. ” (S1004N), the process advances to step S1009, and when the component placement or wiring processing is finished, the process advances to step S1010, and the process ends. If the component placement or wiring process continues, the process returns to step S1001 and the component placement or wiring process continues. If the input/output attribute (IO information attribute) of the terminal 21 of the component 20 is "INTPUT" (S1004Y), the process advances to the next step S1005.

As shown in FIG. 3, the component database 500 includes component information indicating that the component name 551 is CPU0001 and the IO attribute 554 of the terminal whose pin number 552 is F12 is "INPUT". 500, row 559. Therefore, since component information indicating that the input/output attribute (IO attribute) of the terminal 21 of the component 20 is "INTPUT" is stored in the component database 500, the process advances to the next step S1005. .

In step S1005, the voltage level of the terminal 21 of the component 20 is determined with reference to the component database 500. If the voltage level of the terminal 21 of the component 20 is CMOS (S1005Y), the process advances to the next step S1006. If the voltage level of the terminal 21 of the component 20 is other than CMOS (S1005N), for example, TTL, the process advances to step S1009, and if the component placement or wiring process is completed, the process advances to step S1010. finish. If the component placement or wiring process continues, the process returns to step S1001 and the component placement or wiring process continues.

In the component database 500, component information in which the component name 551 is CPU0001, the pin number 552 is F12, and the voltage level 558 of the terminal is "CMOS" is stored in a row 559. Therefore, since the component information indicating that the voltage level of the terminal 21 of the component 20 is "CMOS" is stored in the component database 500, the process advances to the next step S1006.

Next, in step S1006, the processing unit 400 automatically performs pull-up connection processing or pull-down connection processing on the terminal 21 of the component 20 on the circuit diagram 10 shown in FIG.

FIG. 6 is a diagram showing an example of pull-up connection processing according to the first embodiment of the present invention, and FIG. 7 is a diagram showing an example of pull-down connection processing according to the first embodiment of the present invention. Referring to FIG. 6, the pull-up connection process is automatically executed by the processing unit 400 connecting the terminal 21 of the component 20 to the power supply (VCC) via the pull-up resistor 40 on the circuit diagram 10. Ru. Referring to FIG. 7, the pull-down connection process is automatically executed by the processing unit 400 connecting the terminal 21 of the component 20 to the ground (GND) via the pull-down resistor 50 on the circuit diagram 10. That is, the pull-up connection process or the pull-down connection process can be performed by the circuit designer in the processing unit 400 without inputting component placement and connection instructions 110 for arranging and connecting individual pull-up resistors or pull-down resistors to the circuit diagram generation unit 200. will be executed automatically.

Note that the processing from step S1002 to step S1006 described above is executed every time a component is placed on the circuit diagram 10, so it is executed for all components on the circuit diagram 10.

Alternatively, after some components have been placed and connected (placement of wiring components) on the circuit diagram 10, the circuit designer requests the circuit diagram generation unit 200 to perform pull-up connection processing and pull-down connection processing. When a command is input as the component placement and connection instruction 110, the process from step S1002 to step S1006 described above may be executed for all components on the circuit diagram at once. In this case, the circuit designer inputs pull-up connection processing and pull-down connection processing commands to the processing unit 400 via the circuit diagram generation unit 200 via the connection 126 or directly to the processing unit 400. It is also possible to configure

When step S1006 ends, the process advances to step S1009, and if the component placement or wiring process is finished, the process advances to step S1010, and the process ends. If the component placement or wiring process continues, the process returns to step S1001 and the component placement or wiring process continues.

Next, the connection determination process for the CMOS input terminal will be explained. As described above, when the circuit designer connects the components on the circuit diagram 10 (S1002N), the process advances to step S1007.

In step S1007, the processing unit 400 determines the connection of the CMOS input terminal. The connection determination process for the CMOS input terminal will be described with reference to FIGS. 8 to 10. 8 to 10 are diagrams showing an example of the process of determining the connection of an input terminal having a voltage level of a CMOS according to the first embodiment of the present invention.

Referring to FIG. 8, after a pull-up connection process is performed on the circuit diagram 10 to connect the terminal 21 of the component 20 to the power supply (VCC) via the pull-up resistor 40, the circuit designer A state in which a component 30 having an output terminal 31 is placed on the circuit diagram 10 by the generation unit 200 is shown.

Next, the circuit designer uses the circuit diagram generation unit 200 to select the terminal 21 of the component 20 connected to the power supply (VCC) via the pull-up resistor 40 and the output terminal 31 of the component 30 on the circuit diagram 10. Connecting. Referring to FIG. 9, the circuit diagram 10 shows a state where the terminal 21 of the component 20 connected to the power supply (VCC) via the pull-up resistor 40 and the output terminal 31 of the component 30 are connected.

As shown in FIG. 9, the circuit diagram generation unit 200 performs pull-up connection processing or pull-down connection processing (in the first embodiment, pull-up connection processing) on the circuit diagram 10. Since the output terminal 31 of another component 30 is connected to the terminal 21 of the component 20 (steps S1001 and S1002N), the processing unit 400 is notified of the connection via the connection 126, and in step S1007, the processing unit 400 is notified that the connection has been made. The unit 400 determines that the output terminal is connected to the input terminal having the voltage level of CMOS (S1007Y), and proceeds to the next step S1008. Note that if the input terminal to which the output terminal is connected is not an input terminal having a CMOS voltage level (S1007N), the process advances to step S1009, and if the component placement or wiring process is completed, the process advances to step S1010. and the process ends. If the component placement process continues, the process returns to step S1001 and the component placement or connection process continues.

Note that whether or not the terminal to which the output terminal is connected is an input terminal having a CMOS voltage level can be determined by repeating steps S1003 to S1005 described above.

Furthermore, in the pull-up connection process or pull-down connection process in step S1006, if the processing unit 400 provides the pull-up resistor and the pull-down resistor with an identification code for identifying the pull-up resistor or the pull-down resistor, based on the identification code, To easily distinguish whether a resistor connected to an input terminal to which an output terminal is connected is a pull-up resistor or pull-down resistor to be deleted, or a resistor component placed by a circuit designer using a circuit diagram generation unit 200. I can do it. Therefore, when the output terminal 31 is connected to the terminal 21, if the resistor 40 connected to the terminal 21 is given an identification code for identifying a pull-up resistor or a pull-down resistor, the processor 400 It is possible to easily determine whether the output terminal 31 is connected to the terminal 21 having a CMOS voltage level (S1007Y). Thereby, the pull-up resistor or pull-down resistor to be deleted can be determined based on the identification code.

In the first embodiment of the present invention, as described above, in step S1007, the processing unit 400 determines whether the output terminal is connected to the input terminal having the voltage level of CMOS (S1007Y). , the process advances to the next step S1008. In step S1008, the processing unit 400 performs pull-up connection processing or pull-down connection processing (in the first embodiment, pull-up connection processing) of the terminal 21 of the component 20 to which the output terminal 31 is connected, from the circuit diagram 10. ) to automatically delete the results. Note that the process of deleting the result of the pull-up connection process or the pull-down connection process is automatically performed by deleting the pull-up resistor 40 or the pull-down resistor 50 on the circuit diagram 10. That is, the process of deleting the results of the pull-up connection process or the pull-down connection process is performed by the circuit designer inputting into the circuit diagram generation unit 200 a component placement and connection instruction 110 for deleting each pull-up resistor or pull-down resistor. Instead, it is automatically executed by the processing unit 400.

FIG. 10 is a diagram illustrating an example of processing for deleting the result of pull-up connection processing for CMOS input terminals according to the first embodiment of the present invention. As shown in FIG. 9, on the circuit diagram 10, the output terminal 31 of another component 30 is connected to the terminal 21 of the component 20 to which the pull-up resistor 40 is connected. , the pull-up resistor 40 was deleted from the circuit diagram 10 by the processing unit 400.

In addition, in the explanation of the example with reference to FIGS. 8 to 10, an example is shown in which the terminal 21 of the component 20 is connected to the output terminal 31 of another component 30. When the output terminal of is connected, similarly, the process of deleting the result of the pull-up connection process or the pull-down connection process is executed. If the process of deleting the result of the pull-up connection process or pull-down connection process is finished, the process advances to step S1009, and if the component placement process is finished, the process advances to step S1010, and the process ends. If the component placement or wiring process continues, the process returns to step S1001 and the component placement or wiring process continues.

Note that the processing from step S1007 to step S1008 described above is performed every time the output terminal of a component is connected on the circuit diagram 10 by the circuit diagram generation unit 200 to the input terminal of the component that has undergone connection processing or pull-down connection processing. (That is, each time a wiring component is placed in step S1002), the processing unit 400 is notified via the connection 126 that the connection has been made and is executed, so that all the components on the circuit diagram 10 is executed.

Alternatively, after some components have been placed and connected (placement of wiring components) on the circuit diagram 10, a circuit designer issues a wiring determination processing command to the circuit diagram generation unit 200 to determine the component placement and connection. When input as the instruction 110, the processing from step S1007 to step S1008 described above is executed for all components on the circuit diagram at once for input terminals to which output terminals are connected. You may. In this case, it is also possible to configure the circuit designer to input a connection determination processing command to the processing unit 400 via the circuit diagram generation unit 200 via the connection 126 or directly to the processing unit 400. It is.

As described above, according to the first embodiment of the present invention, by automatically processing unconnected input terminals of components, it is possible to prevent open states of CMOS voltage level input terminals. , the reliability of circuit design can be improved. In addition, when a circuit designer connects the CMOS voltage level input terminal to another component or the output terminal of the own component, the pull-up connection process or pull-down connection process is automatically deleted, so the circuit The burden on the designer can be reduced.

Therefore, according to the first embodiment of the present invention, it is possible to provide a circuit design device that contributes to automatically processing unconnected input terminals of components. Further, according to the first embodiment of the present invention, reliability of circuit design is improved by automatically processing unconnected input terminals of components, and CMOS voltage levels connected to output terminals are improved. Since the pull-up connection processing or pull-down connection processing of the input terminals of the input terminals are automatically deleted, operability can be improved by reducing the burden on the circuit designer.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. Note that the circuit design device according to an embodiment of the present invention may be realized on a terminal installed with circuit design CAD (Computer Aided Design) software. An example of the configuration of the circuit design apparatus according to the second embodiment of the present invention is the same as an example of the configuration of the circuit design apparatus 100 according to the first embodiment of the present invention shown in FIG. Omitted.

Next, the operation of the circuit design apparatus according to the second embodiment of the present invention will be explained with reference to the drawings. The operation of the circuit design apparatus according to the second embodiment of the present invention is different from the operation of the circuit design apparatus according to the first embodiment of the present invention, as shown in FIG. 4 in the first embodiment of the present invention. This is the method of pull-up connection processing or pull-down connection processing in step S1006 described above. In the first embodiment of the present invention, the pull-up connection process described with reference to FIG. It is carried out rather than doing. In addition, in the first embodiment of the present invention, the pull-down connection process described with reference to FIG. It is executed by

On the other hand, FIG. 11 is a diagram showing an example of pull-up connection processing according to the second embodiment of the present invention, and FIG. 12 is a diagram showing an example of pull-down connection processing according to the second embodiment of the present invention. It is a diagram. In the second embodiment of the present invention, referring to FIG. 11, the pull-up connection process is performed by directly connecting the terminal 21 of the component 20 to the power supply (VCC) via the wiring 45 on the circuit diagram 10. executed. Referring to FIG. 12, the pull-down connection process is executed by directly connecting the terminal 21 of the component 20 to the ground (GND) via another wiring 55 on the circuit diagram 10.

Note that the processing method for deleting the result of the pull-up connection process or pull-down connection process in step S1008 described with reference to FIG. 4 in the first embodiment of the present invention is also applied in the second embodiment of the present invention. , is executed as follows.

That is, in the second embodiment of the present invention, the processing unit 400 deletes from the circuit diagram 10 the result of the pull-up connection process or pull-down connection process of the terminal 21 of the component 20 to which the output terminal 31 is connected. Now, this is done by deleting the wiring 45 or other wiring 55 on the circuit diagram 10. If the wiring 45 or other wiring 55 is not deleted, the output terminal 31 will be directly connected to the power supply (VCC) or ground (GND), so the process of deleting the wiring 45 or other wiring 55 is necessary. is a required process.

As described above, according to the second embodiment of the present invention, it is possible to provide a circuit design device that contributes to automatically processing unconnected input terminals of components. . Further, according to the second embodiment of the present invention, the reliability of circuit design is improved by automatically processing unconnected input terminals of components, and the CMOS voltage level connected to the output terminal is improved. Since the pull-up connection processing or pull-down connection processing of the input terminals of the input terminals are automatically deleted, operability can be improved by reducing the burden on the circuit designer.

Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and may be further modified, replaced, or adjusted without departing from the basic technical idea of the present invention. can be added. For example, the network configuration, the configuration of each element, and the form of message expression shown in each drawing are examples to help understand the present invention, and the present invention is not limited to the configuration shown in these drawings. Moreover, "A and/or B" is used to mean at least either A or B.

Further, the procedures shown in the first to second embodiments described above can be realized by a program that causes a computer (9000 in FIG. 13) that functions as a circuit design device of the present invention to realize the function as a circuit design device. be. Such a computer is exemplified by a configuration including a CPU (Central Processing Unit) 9010, a communication interface 9020, a memory 9030, and an auxiliary storage device 9040 in FIG. That is, the CPU 9010 in FIG. 13 executes the control program of the circuit design apparatus and updates each calculation parameter stored in the auxiliary storage device 9040 or the like.

The memory 9030 is a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.

That is, each part (processing means, function) of the circuit design apparatus shown in the first to second embodiments described above is a computer program that causes the processor of the computer to execute each of the processes described above using its hardware. This can be realized by

Finally, preferred embodiments of the present invention will be summarized.
[First form]
(See the circuit design device from the first perspective above)
[Second form]
In the first aspect of the circuit design apparatus, the pull-up connection process is performed by connecting the terminal to a power source via a pull-up resistor on the circuit diagram, and the pull-down connection process is performed by connecting the terminal to a power source via a pull-up resistor on the circuit diagram. Preferably, this is carried out by connecting the terminal to ground via a pull-down resistor on the circuit diagram.
[Third form]
In the first aspect of the circuit design apparatus, the pull-up connection process is performed by connecting the terminal to a power source via wiring on the circuit diagram, and the pull-down connection process is performed on the circuit diagram by connecting the terminal to a power source via wiring. Preferably, the above is carried out by connecting the terminal to ground via another wiring.
[Fourth form]
In the first aspect of the circuit design device, the circuit diagram generation unit may connect the terminal of the component to which the pull-up connection process or the pull-down connection process has been performed to an output terminal of another component on the circuit diagram. is connected, the processing unit executes a process of deleting the result of the pull-up connection process or the pull-down connection process of the terminal of the component to which the output terminal is connected, from the circuit diagram. It is preferable.
[Fifth form]
In the circuit design device according to a fourth aspect, the pull-up connection process is performed by connecting the terminal to a power source via a pull-up resistor on the circuit diagram, and the pull-down connection process is performed by connecting the terminal to a power source via a pull-up resistor on the circuit diagram. carried out by connecting said terminal to ground via a pull-down resistor on the circuit diagram, and
It is preferable that the process of deleting the result of the pull-up connection process or the pull-down connection process is performed by deleting the pull-up resistor or the pull-down resistor on the circuit diagram.
[Sixth form]
In the circuit design device according to a fifth aspect, the processing unit assigns an identification code to the pull-up resistor and the pull-down resistor to identify the pull-up resistor or the pull-down resistor, and deletes the pull-up resistor or the pull-down resistor. Preferably, the pull-down resistance is determined based on the identification code.
[Seventh form]
In the circuit design device according to a fourth aspect, the pull-up connection process is performed by connecting the terminal to a power source via wiring on the circuit diagram, and the pull-down connection process is performed on the circuit diagram by connecting the terminal to a power source via wiring. above, by connecting said terminal to ground via another wire, and
It is preferable that the process of deleting the result of the pull-up connection process or the pull-down connection process is performed by deleting the wiring or the other wiring on the circuit diagram.
[Eighth form]
In the circuit design device according to a seventh aspect, the processing unit assigns an identification code to the wiring and the other wiring to identify the wiring or the other wiring, and deletes the wiring or the other wiring. , is preferably determined based on the identification code.
[Ninth form]
(Refer to the circuit design method from the second viewpoint above)
[Tenth form]
(See the program from the third perspective above)
Note that the ninth to tenth forms described above can be developed into second to eighth forms similarly to the first form.

In addition, each disclosure of the above-mentioned patent documents is incorporated into this book by reference. Within the scope of the entire disclosure of the present invention (including the claims), changes and adjustments to the embodiments and examples are possible based on the basic technical idea thereof. Furthermore, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) are possible within the framework of the disclosure of the present invention. It is. That is, it goes without saying that the present invention includes the entire disclosure including the claims and various modifications and modifications that a person skilled in the art would be able to make in accordance with the technical idea. In particular, numerical ranges stated herein should be construed as specifically stating any numerical value or subrange within the range, even if not otherwise stated.

10 Circuit diagram 20 Component 21 Terminal 30 Another component 31 Output terminal 40 Pull-up resistor 45 Wiring 50 Pull-down resistor 55 Other wiring 100 Circuit design device 200 Circuit diagram generation section 300 Circuit diagram storage section 400 Processing section 500 Component database 600 Circuit diagram Display section 9000 Computer 9010 CPU
9020 Communication interface 9030 Memory 9040 Auxiliary storage device

Claims (9)

a circuit diagram generation section;
a circuit diagram storage unit;
including a processing section;
The circuit diagram generation unit arranges components on a circuit diagram containing placement information and connection information of each component stored in the circuit diagram storage unit,
The input/output attributes of the terminals of the component arranged by the circuit diagram generation unit are input in a component database that stores component information including the input/output attributes of each terminal and the voltage level of each terminal for each component. , and if component information indicating that the voltage level of the terminal of the component is CMOS is stored, the processing section generates a pull voltage for the terminal of the component on the circuit diagram. Perform up connection processing or pull down connection processing,
When the circuit diagram generating unit connects the output terminal of another component to the terminal of the component that has undergone the pull-up connection process or the pull-down connection process on the circuit diagram, the process unit The circuit design apparatus executes a process of deleting, from the circuit diagram, a result of the pull-up connection process or the pull-down connection process of the terminal of the component to which the output terminal is connected. The pull-up connection process is performed by connecting the terminal to a power source via a pull-up resistor on the circuit diagram, and the pull-down connection process is performed by connecting the terminal to a power source via a pull-down resistor on the circuit diagram. The circuit design device according to claim 1, wherein the circuit design device is executed by connecting the terminal to ground. The pull-up connection process is performed by connecting the terminal to a power source via a wire on the circuit diagram, and the pull-down connection process is performed by connecting the terminal to a power source via another wire on the circuit diagram. The circuit design device according to claim 1, wherein the circuit design device is executed by connecting the terminal to ground. The pull-up connection process is performed by connecting the terminal to a power source via a pull-up resistor on the circuit diagram, and the pull-down connection process is performed by connecting the terminal to a power source via a pull-down resistor on the circuit diagram. carried out by connecting said terminal to ground, and
2. The circuit design apparatus according to claim 1 , wherein the process of deleting the result of the pull-up connection process or the pull-down connection process is performed by deleting the pull-up resistor or the pull-down resistor on the circuit diagram. The processing unit provides the pull-up resistor and the pull-down resistor with an identification code for identifying the pull-up resistor or the pull-down resistor, and selects the pull-up resistor or pull-down resistor to be deleted based on the identification code. 5. The circuit design apparatus according to claim 4 , which determines. The pull-up connection process is performed by connecting the terminal to a power source via a wire on the circuit diagram, and the pull-down connection process is performed by connecting the terminal to a power source via another wire on the circuit diagram. carried out by connecting the terminal to ground, and
2. The circuit design apparatus according to claim 1 , wherein the process of deleting the result of the pull-up connection process or the pull-down connection process is performed by deleting the wiring or the other wiring on the circuit diagram. The processing unit assigns an identification code for identifying the wiring or the other wiring to the wiring and the other wiring, and determines the wiring or the other wiring to be deleted based on the identification code. 7. The circuit design device according to claim 6 . executed by a computer,
placing the components on a circuit diagram including placement information and connection information for each component;
Indicates that the input/output attribute of the terminal of the arranged component is input in a component database storing component information including the input/output attribute of each terminal and the voltage level of each terminal for each component, and If component information indicating that the voltage level of the terminal of the component is CMOS is stored, performing pull-up connection processing or pull-down connection processing for the terminal of the component on the circuit diagram ; ,
If the output terminal of another component is connected to the terminal of the component that has undergone the pull-up connection process or the pull-down connection process on the circuit diagram, the connection of the output terminal can be determined from the circuit diagram. A circuit design method, comprising: executing a process of deleting a result of the pull-up connection process or the pull-down connection process of the terminal of the component . to the computer,
A process of placing components on a circuit diagram that includes placement information and connection information for each component;
Indicates that the input/output attribute of the terminal of the arranged component is input in a component database storing component information including the input/output attribute of each terminal and the voltage level of each terminal for each component, and If component information indicating that the voltage level of the terminal of the component is CMOS is stored, pull-up connection processing or pull-down connection processing is performed on the terminal of the component on the circuit diagram;
If the output terminal of another component is connected to the terminal of the component that has undergone the pull-up connection process or the pull-down connection process on the circuit diagram, the connection of the output terminal can be determined from the circuit diagram. A program that causes a program to execute a process of deleting a result of the pull-up connection process or the pull-down connection process of the terminal of the component .

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