JPH09231249A - Printed board circuit design system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To design a printed board circuit with its logical and electrical sides separated from each other by performing the logical design for production of a set of net lists showing the connection of logical elements and then performing the electrical design for addition of the net lists corresponding to the parts to the said set of net lists. SOLUTION: A logical net production means 112 operates based on the information inputted by a logical connection information input means 111 and produces a basic set of net lists corresponding to the logical design to store it in a net just storage means 113. A parts net production means 116 operates based on a design information script inputted by a design information input means 115 and a parts macro script stored in a parts information storage means 114 and adds the net lists corresponding to the parts shown in the design information script to the said set of net lists. Then a net list updating means 117 operates based on the design information script and secures the connection between the added net lists and those to be connected. Thus the logical and electrical sides of a printed board circuit can be designed independently of each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board circuit design system for designing a circuit on a printed circuit board. In order to provide integrated functions by the circuit mounted on the printed circuit board, various parts such as LSI, resistors, and capacitors should be logically and appropriately arranged, and the electrical signals sent and received between the parts should be electrically connected. It is necessary to consider the nature. In the days when the scale of integrated circuits was small, it was important to realize a cohesive function by logically connecting a plurality of integrated circuits on a printed circuit board and showing the cooperation between them. A large-scale integrated circuit such as an LSI realizes a considerably large-scale function, and the importance of the logic design work in the design work of the printed circuit board circuit is decreasing. On the other hand, in order to miniaturize the device, high-density wiring is required for the printed circuit board. Furthermore, in order to realize higher circuit operation speed, electrical delay such as signal delay time is required. It is also necessary to sufficiently satisfy the above conditions. Along with this, mounting design work for arranging components such as LSIs on a printed circuit board and wiring design has become remarkably difficult, and the time required for mounting design tends to be prolonged. In order to compensate for the increase in the time required for this mounting design, a technology that shortens the time required for the circuit design of the printed circuit board is required, and to facilitate the cooperation between the circuit design of the printed circuit board and the mounting design. To
There is a need for a technology that allows a provisional design circuit of a printed circuit board to be quickly passed to a mounting design trial.

[0002]

2. Description of the Related Art As a designing method for a single LSI, it is necessary to describe a logical relationship between a huge number of circuit elements, and therefore logical connection between elements is defined by HDL (Hardware Description Language).
A language design method, which is described in a language and automates the design work based on this description, is adopted, and it has a great effect on labor saving of the design work.

Further, by utilizing this language design method, logical connections between a plurality of LSIs are described in the HDL language or the like, and for example, an LS mounted on one printed circuit board.
For a circuit having a combination of I or a combination of more LSIs, verification work of its logical linking operation is performed. As an example of the HDL language, IE
VHDL (VHSIC H) which is the standard hardware description language of EE
ardware Description Lnguage, VHSIC: Very High Speed
IntegretedCircuit) language etc.

This VHDL language hardware description has three levels: an operation level, a register transfer level, and a gate level. Depending on the most abstract operation level, the operation of the LSI as a whole and other L levels are possible.
The operation of verifying the coordinated operation of the above-described plurality of LSIs is performed by describing the operation when connecting to the SI.

On the other hand, as a CAD system for designing a printed circuit board, a CAD system established in a time when the degree of integration of individual integrated circuits was low is used as it is. In FIG.
The structural example of the conventional printed circuit design CAD system is shown. In FIG. 12, a drawing data library 401
In the drawing, drawing data for representing symbols indicating various elements arranged in the circuit diagram is registered.

The user of this CAD system designates, through the drawing instruction input unit 402, the elements to be arranged and the connection lines connecting these elements, and accordingly, the drawing processing unit 4
03 retrieves the drawing data corresponding to the corresponding symbol from the library 401 described above, and combines the drawing data and the drawing data indicating the connection to create the drawing data representing the circuit diagram.

At this time, the designer of the printed circuit board is
The connection information between the LSIs used in the above-described LSI verification work is referred to, and the description about the connection between the LSIs in the VHDL language is replaced with the wiring on the circuit diagram. Further, the drawing data created in this way is provided to the processing of the display processing unit 404 and provided to the user as a circuit diagram via the display 405 and a printer (not shown).

That is, conventionally, both a logical connection and an electrical connection of each element are expressed by drawing a circuit diagram showing elements such as an LSI, a resistor, and a capacitor and wirings connecting these elements. It was Therefore, conventionally, when designing a circuit on a printed circuit board, a designer pays attention to a logical meaning of a signal and performs a logical design work for realizing a required function by combining components and a physical design of the signal. In consideration of such properties, electrical design work to satisfy the required performance is performed in parallel at the same time.

The printed circuit board designed in this manner is passed on to the mounting design work and is used for layout processing of the mounting circuit such as placement of each LSI and routing of actual wiring. In the case of inconvenience that a part of the wiring cannot be laid out during this layout processing, the circuit design work of the printed circuit board is performed again, and the LS
Modification work such as changing the pin arrangement of I was done,
The layout design of the LSI itself is also changed according to the change of the pin arrangement.

[0010]

By the way, due to the large scale of the integrated circuit, each LSI has come to play a highly integrated logical role, and the logical design on the printed circuit board is simply performed between the LSI and the LSI. It is just a monotonous work to connect the terminals of and. In particular, at the design stage of each LSI, verification work is performed on the linking operation of a plurality of LSIs, and in this verification work, nets made up of logical wirings between the LSIs arranged on the printed circuit board are determined. Considering that, the logical design work of the circuit on the printed circuit board is no longer 2
Only time and effort.

As described above, although the logic design itself has become monotonous and has become a mere skeleton, the wiring between the LSIs has been changed as the number of terminals in each individual LSI increases and the number of LSIs arranged on the printed circuit board increases. The work itself represented in the circuit diagram has become complicated, and the time and effort required for the logic design work have rather increased. On the other hand, the electrical design of printed circuit boards is
With increasing importance, it has become very complicated.

This is because it is necessary to consider the analog operation of the circuit in order to operate the circuit at high speed, and in order to satisfy the strict electrical condition, the LS is required.
By expressing the elements such as the terminating resistor and damping resistor connected to each terminal of I on the circuit diagram, the complicated circuit diagram becomes even more complicated even with only logical connections.

Further, in the circuit diagram, for example, even a set of logically organized signal lines such as a bus is independently expressed as individual connection lines connecting respective terminals. Therefore, when adding an element such as a terminating resistor to the bus, the same element is repeatedly added to each of the signal lines corresponding to the number of bits of the signal line (for example, 32 bits or 64 bits) forming the bus. There is a need.

The elements added at this time are expressed as a circuit diagram even if all the signal lines included in the bus can be mechanically and uniformly determined if electrical conditions such as the operating frequency are determined. In order to do so, it is necessary for the designer to add the corresponding symbol and the wiring for the connection for each individual signal line. In addition, when an additional circuit for satisfying the above-mentioned electrical conditions is realized by using a circuit element in which a resistance element or a buffer circuit is integrated as a portion, the designer makes each portion of this circuit element It was necessary to manually assign the signal lines.

For this reason, the electrical design work becomes very complicated, and the amount of work becomes enormous. Therefore, although the importance thereof has increased, in particular, leakage of additional work of elements such as terminating resistors has occurred. It is easy for mistakes to occur, which may reduce reliability. Further, since the resistance element or the buffer as described above is inserted, the logical net formed by the wiring between the LSIs may be divided in the appearance of the circuit diagram, and the mounting condition such as the wiring length limitation. Was difficult to give to a logical net.

Further, in the conventional method, a new LS is used.
Every time an I element appears, it is necessary to register the drawing data indicating the symbol in the CAD library just in order to express these elements in the circuit diagram, and the labor required for such operation is also required. It is a heavy burden on the designer. As described above, in the conventional method of expressing the circuit of the printed circuit board by the circuit diagram, the logical side surface and the electrical aspect of the circuit of the printed circuit board are defined by the figure composed of the symbol indicating each element and the signal line connecting them. By expressing both the side and the side at the same time, the circuit diagram becomes too complicated, and now it is required to mount the elements on the printed circuit board with high density, the work load of the designer is no longer limited. It is coming.

Therefore, since it is very difficult to shorten the time required for circuit design of the printed circuit board by following the conventional technique, it is necessary in the information provided from the LSI design work and the mounting design. There is a need for a method that more appropriately expresses the circuit design of a printed circuit board in consideration of the information that is given. SUMMARY OF THE INVENTION It is an object of the present invention to provide a CAD system for circuit design of a printed circuit board, which separates the circuit design of the printed circuit board into a logical side and an electrical side and enables independent design.

[0018]

FIG. 1 is a principle block diagram of a printed circuit board circuit design system according to claims 1 to 6. According to the invention of claim 1, a logical connection information input means 111 for inputting a logical connection script for describing a connection relationship of logical parts including an LSI in a predetermined format, and a network corresponding to each logical part based on the logical connection script. A logical net creating unit 112 that creates a list and indicates a connection relationship of signals transmitted and received between each logical component, and a net list storage unit 113 that stores a net list corresponding to each component.
A component information storage unit 114 that stores a component macro script describing the configuration of each electrical component in a predetermined format as component information corresponding to the component name, component designation information indicating an electrical component to be added, and a connection destination indicating the connection destination. Based on the design information input means 115 for inputting a design information script describing information and a predetermined format, and a component macro script and a design information script, a netlist corresponding to an electrical component to be added is created, and a netlist is created. The net list corresponding to the connection destination indicated by the design information script is updated using the component net creation unit 116 added to the storage unit 113 and the information indicating the connection relationship to the net list added by the component net creation unit 116. And a netlist updating means 117 for controlling the network.

According to the first aspect of the present invention, the logical net creating means 112 operates according to the information input by the logical connection information input means 111 to create a basic netlist set corresponding to the logical design. , Can be stored in the netlist storage means 113. Further, the part net creating means 116 operates based on the design information script input by the design information input means 115 and the part macro script held in the part information storing means 114, so that the part indicated by the design information script , A new netlist corresponding to can be added to the set of netlists, and the netlist updating means 11 can be added.
7 operates in accordance with the design information script, so that the added netlist and the netlist of the connection destination can be linked.

In this way, the logic design is regarded as the work of creating a basic netlist set showing the connection relationship of the logic elements, and the electrical design is added to the above-mentioned basic netlist set and the nets corresponding to the respective parts are added. By considering it as the work of adding the list, it becomes possible to separate the circuit design of the printed circuit board into a logical side and an electrical side and to proceed independently of each other.

According to a second aspect of the present invention, in the printed circuit board circuit design system according to the first aspect, the logical connection information input means 111 is an HDL (Hardware) created at the time of operation verification work for a plurality of LSIs at the LSI design stage. De
It is characterized in that it receives connection information in the description language) and inputs it as a logical connection script.

According to the second aspect of the invention, the logical connection information input means 111 inputs the mutual connection information of the LSIs obtained at the design stage of the LSI as it is, and the logical net forming means 11
By applying the processing of No. 2, a basic netlist set can be created, so that the logic design work can be omitted and the designer can concentrate on electrical design.
According to a third aspect of the present invention, in the printed circuit board circuit design system according to the first aspect, the design information input means 115 stores the design information script 121.
And a design information script that specifies a plurality of signals as connection destination information from the design information storage unit 121, generates a design information script for each of the plurality of connection destinations, and develops the script for use in the processing of the component net creation unit 116. And a means 122.

The invention of claim 3 is a script expanding means 1
By operating the component net creating means 116 according to each design information script expanded by 22
The same component can be added to each of the plurality of signals. In this case, the design information storage unit 121 stores a design information script in which addition of components is described collectively for a plurality of signals, thereby automating the work of adding the same component to each of the plurality of signals. Therefore, it is possible to significantly reduce the effort of the designer when creating the design information script.

According to a fourth aspect of the present invention, in the printed circuit board circuit design system according to the first aspect, the characteristic value is included in correspondence with the part name indicating each part registered in the part information storage means 114. The design information input means 115 is provided with a part characteristic storage means 123 for storing information, and the design information storage means 121 for storing a design information script and a design in which the characteristic information of the part is designated from the design information storage means 121 as the part designation information. The configuration is characterized by including an information script, retrieving a component name corresponding to the characteristic information from the component characteristic storage unit 123, and providing a component allocating unit 124 for processing by the component net creating unit 116.

The invention of claim 4 is the component allocating means 124.
Assigns a component corresponding to the feature information based on the component feature storage means 123 and supplies it to the processing of the component net creating means 116, so that in the design information script,
It becomes possible to specify a part by the characteristic information. As a result, for example, appropriate parts can be automatically assigned according to the resistance value and operating frequency, thus freeing the designer from routine routine work and significantly reducing the work burden on the designer. You can

According to a fifth aspect of the present invention, in the printed circuit board circuit design system according to the first aspect, the design information input means 115 includes a design information storage means 121 for storing a design information script and a component from the design information storage means 121. Receive a design information script that specifies a module part that contains multiple electric parts as portions as specification information,
A portion allocating means for selecting an appropriate portion of the module component based on the component information corresponding to the module component and the information about the set of netlists stored in the netlist storing means 113, and providing it to the processing of the component net creating means 116. And 125.

According to a fifth aspect of the invention, the portion allocating means 1
25 automatically refers to the part information storage means 114 and the net list storage means 113, selects an appropriate portion and uses it for the processing of the component net creation means 116, thereby automatically allocating the portion of the module component as an additional component. Is possible. Thus, in the design information script, the work of explicitly designating the portion for each individual component can be omitted, and the work load on the designer can be reduced.

According to a sixth aspect of the present invention, in the printed circuit board design system according to the first aspect, net designation information for designating a logical net and condition information indicating a mounting condition for the net are described in a predetermined format. The mounting condition input means 126 for inputting the conditional design script and the netlist designated by the net designation information are stored in the netlist storage means 1.
13 and mounting condition setting means 127 for adding the mounting condition indicated by the condition information.

According to the invention of claim 6, the mounting condition input means 12
6 and the mounting condition setting means 127, it is possible to specify the mounting condition for the logical net and add the specified mounting condition to the corresponding net list. FIG.
FIG. 10 is a principle block diagram of a printed circuit board circuit design system according to claims 7 to 9.

According to a seventh aspect of the present invention, in the printed circuit board circuit design system according to the first aspect, the component information storage means 114 stores the circuit diagram storage means 128 for storing the circuit diagram data in which the configuration of the component is represented by a circuit diagram. And a connection that stores a part macro script that describes, in a predetermined format, the terminal information related to the connection terminals of the part represented by the circuit diagram data and the circuit diagram designation information indicating the circuit diagram data corresponding to the part name indicating the part. And a configuration including an information storage unit 129,
The component net creating means 116 is configured to detect the circuit diagram designation information from the component macro script corresponding to the component designated in the design information script, and create a net list including the circuit diagram designation information. To do.

According to a seventh aspect of the present invention, a parts net creating means 1 is provided.
By the operation of 16, the circuit diagram data stored in the circuit diagram storage unit 128 and the netlist corresponding to the component can be hierarchically combined via the circuit diagram designation information stored in the connection information storage unit 129. Therefore, it is possible to treat the component represented by the circuit diagram in the same manner as other components.

According to an eighth aspect of the present invention, in the printed circuit board design system according to the first aspect, a different part number is given to each of the netlists created by the logic net creating means 112 and the part net creating means 116. Numbering means 131 and netlist storage means 1
Based on the netlist stored in 13 and the component information stored in the component information storage means 114, a connection table showing the connection destinations of the terminals provided in each component, a component number and a component name for all components And a table creating unit 132 for creating a parts list showing the information included therein.

In the invention of claim 8, the part number assigning means 13 is provided.
By assigning a part number for identifying each part to each netlist by 1, the table creating means 132 creates a connection table and a parts list by using this part number.
Information equivalent to that of the conventional circuit diagram can be provided to be used for verification work by the designer. The invention of claim 9 is, in the printed circuit board circuit design system according to claim 8, corresponding to information for identifying each part, a number history for holding a part number given in the previous design as history information. The number assigning unit 131 includes a holding unit 133, and the number assigning unit 131 assigns a component number to a corresponding netlist in response to an input of a design information script in which a component number is designated along with component designation information, and a component number designation. Number history holding means 1 according to the input of the design information script not including
33 is referred to, and the number history reflecting means 135 for preferentially assigning the part number indicated in the history information to the netlist corresponding to each relevant part is configured. .

According to the ninth aspect of the present invention, a specific part number can be forcibly given to a logic element such as an LSI by the operation of the forcing means 134 provided in the number giving means 131. Further, the history reflecting means 135 operates based on the contents of the number history holding means 133,
Depending on the feedback from the mounting design, the part number used in the previous design can be inherited when the printed circuit board is redesigned.

[0035]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 3 shows an embodiment of a printed circuit board circuit design system of the present invention. In the printed circuit board circuit design system shown in FIG. 3, the connection information reading unit 211 reads the LSI from the connection information file 201.
The connection information describing the connection between the devices is read and converted into a netlist storing connection information including signal names corresponding to the defined terminal names for each LSI, as shown in FIG. The net list table 212 corresponding to the list storage means 113 is used for storing.

This connection information file 201 is composed of a logical connection script which describes the correspondence between terminals and signals defined for each LSI arranged on the printed circuit board to be designed. Part 2
The terminal 11 may extract the terminal name and signal name corresponding to each LSI from these logical connection scripts and create a netlist for each.

In this way, the connection information reading unit 211 operates based on the contents of the connection information file 201 to realize the functions of the logical connection information input unit 111 and the logical net creation unit 112 described in claim 1. The logical design information of the printed circuit board given as the connection information can be extracted and used in the electrical design process described later. The logical connection script may be in any format as long as it can describe the correspondence between each terminal of the LSI and the signal. For example, a connection table in which the terminal name and the signal name are associated with each other is created by a word processor. May be.

In this case, the conventional logic design work is replaced by the work of creating a logical connection script such as the connection table described above. Here, as the information indicating the connection between the LSIs, the logical connection script is easier to understand intuitively than the conventional circuit diagram. The replacement can significantly reduce the burden on the designer.

Further, particularly when the invention of claim 2 is applied, the connection information reading unit 211 obtains the necessary information described above from the connection information described in a language such as the VHDL language used in the design system of the LSI alone. With the configuration in which the connection information is extracted and converted into the netlist as shown in FIG. 3, the connection information used for verifying the linked operation of the LSI can be used as it is.

As a result, the above-mentioned work of creating the logic connection script can be made unnecessary, so that the labor spent on the logic design work, which has been made into a skeleton, can be reduced as much as possible, and the labor of the designer on the electrical design work of the printed circuit board. Can be concentrated. Next, a method for performing electrical design work using a set of netlists corresponding to the above-described LSIs will be described.

FIG. 5 is a flowchart showing the basic operation of electrical design according to the present invention. In the printed circuit board circuit design system shown in FIG. 3, the electrical information reading unit 213 first
A component macro script described later is read from the component macro file 202 and registered in the component table 214 corresponding to the component information storage means 114 (steps 301, 30).
2) Next, the design information scripts are sequentially read from the design script file 203 (step 303),
The configuration is provided for the processing of the script interpretation unit 215.

Here, the component macro file 202 is a component macro script that describes the configuration of the component itself when the electrical components such as the damping resistor, the bypass capacitor, and the buffer are configured by using individual elements or module elements. It is configured. Further, in the component macro script corresponding to each component, for example, each component name and the configuration information consisting of the characteristic value and the input / output terminal and the net information indicating the connection of each element inside the component are described, You just have to define the parts themselves.

The design script file 203 is
It is composed of a design information script that describes electrical design conditions such as addition of components such as damping resistors and buffers, and allocation of signals to connectors and LSI pins. In the design information script that specifies the addition of a part, the part to be added is indicated by the part specification information including the part name defined in the part macro script described above, and the connection destination information including the signal name to which this part is added is described. In addition, in the design information script for designating the allocation of the connector or the pin of the LSI, the signal name of the allocation target and the pin of the allocation destination may be specified to describe the correspondence.

In response to the input of this design information script,
The script interpretation unit 215 first determines whether or not the design information script is a description regarding addition of an electrical component (step 304). In the case of positive determination in step 304, the script interpretation unit 215 determines that the component search unit 21
6 and the net search unit 217 to search the component table 214 and the net list table 212 for the component macro script corresponding to the electrical component specified by the design information script and the net list corresponding to the signal (step 305). The configuration is provided for the processing of the component adding unit 218.

For example, when a damping resistor d is added to the signal S1 output from the LSIa shown in FIG. 4A and input to the LSIb, the net search unit 217
Based on the signal S1, the netlists a and b corresponding to the above-described LSIa and LSIb are searched from the netlist table 212, and the component search unit 218 searches for the component macroscript corresponding to the damping resistance d. The processing is performed by the component adding unit 218.

In response to this, the component adding section 218 may create a new netlist corresponding to each terminal of the additional component (for example, damping resistance d) and add it to the netlist table 212 (step 306, Figure 4
(B)). At this time, the component adding unit 218 may give a new component number to the additional component and create a new netlist including this component number and information indicating the signal connected to each pin provided on the component. .

Next, the component adding section 218 operates as the netlist updating means 117, and adds pointer information indicating the cooperative relationship with this new netlist to the netlist corresponding to the signal designated by the connection destination information. It may be added (step 307, see FIG. 4B). In this way, the function of the component net creating means 116 described in claim 1 is realized by operating the component searching unit 216, the net searching unit 217, and the component adding unit 218 according to the instruction from the script interpreting unit 215. Then, based on the design information script corresponding to the electrical design information, a new netlist corresponding to electrical components such as resistors is added to the basic netlist showing the connection of the logical components such as LSI, and the logical components and electrical components are added. It is possible to show the cooperation between all parts including both parts.

The part number assigning operation will be described in detail later. After that, the script interpretation unit 215
It is determined whether or not there is a design information script that has not been interpreted (step 308), and in response to the affirmative determination, step 3
Return to 01 to receive the input of the new design information script. On the other hand, for example, when the design information script describing the pin assignment for the LSIa described above is input, the negative determination is made in step 304 described above, and the script interpretation unit 215 receives the design received via the net search unit 217. The net list indicated by the information script may be searched (step 309), and the information indicating the corresponding net list, the signal name of the allocation target and the pin number of the allocation destination may be provided to the processing of the pin allocation processing unit 219.

In response to this, the pin assignment processing unit 219 creates information indicating the correspondence between the designated signal and the pin of the LSIa, and adds it to the net list (step 310). Of course, by the design information script,
When the pin assignment of the connector to the designated signal is described, the pin assignment processing unit 219 creates a net list showing the correspondence between each signal and the connector pin in step 310 described above.

As described above, the pin assignment processing unit 219 adds a netlist in accordance with the information received from the script interpretation unit 215, thereby expressing the pin assignment instruction given by the script as a set of netlists. Can be added to the circuit design data. In this way, after the process of the design information script describing the pin assignment is completed, the process proceeds to step 308, and the processes of step 301 to step 310 described above are repeated until the process for all the design information scripts is completed. Good.

As described above, by adding new netlists corresponding to the correspondence relationships between each component or signal and the pin to the netlist table 212 one after another,
It is possible to obtain a set of netlists including all the information included in the conventional circuit diagram. Therefore, the designer can replace the work of drawing each component on the conventional circuit diagram by creating the component macro script and the design information script and inputting them into this printed circuit board circuit design system. It is possible to obtain a design result equivalent to the created circuit diagram.

Here, as described above, since the design information script is a description of the connection relation of each component,
The designer may describe this design information script by paying attention only to the connection of individual parts. In this case, as in the case of the design using the conventional circuit diagram, it is possible to save the unnecessary work required only for drawing the circuit diagram, such as the work for securing the space for arranging the symbols representing each component. Therefore, the designer can concentrate on the original electrical design.

Further, the work of adding the components necessary for satisfying the electrical condition to each LSI can be handled as the work of adding a new netlist to the basic netlist. Can be clearly separated into logical design work and electrical design work. In this way, logical design and electrical design are separated as independent tasks, and the designer is relieved of the task of drawing circuit diagrams, which significantly reduces the burden on the designer and enables efficient and efficient printed circuit board circuit design. It is possible to proceed with the design work of.

As described above, according to the system of the present invention, both the time required for the logical design work and the electrical design work for the printed circuit board can be greatly reduced, so that the design data can be sent to the mounting design work at an early stage. It is possible to pass it on, and it is possible to promptly respond to feedback from the mounting design work side. When the processing for all the design information scripts is completed as described above, the processing ends as a negative determination in step 308, and at this time, the script interpreting unit 215 notifies the end notification that the electrical design work is completed. Is sent to the design file creation unit 221 and the table creation unit 222.

In FIG. 3, the design file creation unit 204
Creates a design data file 205 in a format suitable for input to the printed circuit board packaging design system based on the contents of the netlist table 212 when receiving the end notification from the script interpretation unit 215 described above. It is configured to be used in the mounting design process. here,
As described above, the printed circuit board is represented as a set of netlists registered in the netlist table 212. Therefore, the design file creation unit 219 follows the pointer information of the netlist to identify each component including the LSI. By logically tracing the connection relationship, design data suitable for the packaging design system can be easily created.

On the other hand, the table output unit 206 is responsive to the above-mentioned end notification, based on the contents of the netlist table 212, a connection table and a printed circuit board showing signals connected to pins provided in each component and connector. A parts list showing the parts to be placed on the printer is created and output via a printer (not shown). here,
The table creation unit 206 creates, for example, an LSI connection table indicating signal names corresponding to pin numbers and pin names for each LSI, and corresponding to each signal name for which electrical conditions are specified. An electrical condition connection table showing the specified electrical conditions may be created and used for output processing of the printer.

Further, the table output unit 206 creates, as a parts list, a table showing, for example, a part name indicating the characteristics of each part and a part macroscript name corresponding to the part number indicating each part, It may be used for output processing by the printer. The connection table and the parts list thus obtained include all the information necessary for checking the circuit design of the printed circuit board.

In this case, it is difficult to intuitively grasp the characteristics and connection relationship of the parts as compared with the case where the circuit diagram is used. However, by comparing the connection table and the parts list, logical connection can be made. It is rather excellent as a method that can trace the relationships and represent the connection relationship of a huge number of signals.
Furthermore, by applying the invention of claims 3 to 5, the design work of the printed circuit board circuit can be further highly automated.

FIG. 6 is a configuration diagram of essential parts of an embodiment of a printed circuit board circuit design system to which the inventions of claims 3 to 5 are applied. In FIG. 6, the script discrimination unit 221
Determines the characteristics of the design information script received from the electrical information reading unit 213, and supplies each design information script to the processing of the script interpreting unit 215, the script expanding unit 222, and the component allocating unit 223 according to the determination result. It is composed.

Further, in FIG. 6, the parts library 22
Reference numeral 4 corresponds to the component characteristic storage means 123 described in claim 3, and corresponds to component names indicating various electric components, corresponding to specification information such as characteristic values and reliability, and to each component. The corresponding part macro script is registered. In this case, the parts table 214 shown in FIG.
Instead of providing the component information, the electrical information electrical information reading unit 213 uses the component macro script read from the component macro file 202 as a new component in the component library 224.
The component search unit 216 registers the component library 2
24 may be searched for an appropriate part macro script.

Further, the above-mentioned component allocating unit 223 searches the component library 224 based on the design information script received from the script discriminating unit 221, and performs a component allocating process described later based on the search result. Has become. Here, the design information script for instructing the insertion of the electrical component includes component designation information for designating the electrical component itself and signal designation information for indicating a signal for inserting the electrical component.

Therefore, the script discrimination section 221
The features of the design information script may be determined based on the component designation information and the signal designation information. FIG. 7 is a flowchart showing the automatic design operation of the printed circuit board circuit. In response to the input of the design information script, first, the script determination unit 221 determines whether or not the signal designation information indicating a plurality of signals is included (step 321). When it is determined that the expansion processing is necessary, the corresponding design information script is sent to the script expansion unit 222.

For example, in the case where the input design information script contains the component designation information for inserting the buffer in correspondence with the signal designation information indicating the data bus composed of a plurality of signals, the script discrimination unit 221 is
This design information script may be sent to the script expansion unit 222 as a positive determination in step 321 described above.

In response to this, the script expanding section 222 creates a design information script for each of the plurality of signals indicated by the signal designating information of the received design information script (step 322). At this time, the script developing unit 222 may create a design information script including signal designation information indicating each signal and component designation information designated by the received design information script for each signal.

As described above, the script expanding unit 222 operates according to the instruction from the script determining unit 221, so that the script expanding unit 122 described in claim 3 is executed.
It is possible to realize the function of (1), develop a design information script that collectively describes component designation information for a plurality of signals, and use the design information script as an design information script for each signal for interpretation processing.

As a result, the design information script
Electrical conditions can be set collectively for multiple signal lines, and the work of repeatedly adding electrical components for these signals can be automated, further reducing the work load on the designer when creating a design information script. In addition to mitigating, it is possible to prevent mistakes such as omission of setting of electrical conditions.

If, as shown in FIG. 6, the expansion result by the script expansion unit 222 described above is sent to the script discrimination unit 221, the step 322 is executed.
The design information script for each of the signals developed in step 3 can be subjected to the processing of step 321 again, and further the determination processing for the component designation information can be performed. For example, when the design information script read from the design script file 203 includes the signal designation information for designating the data bus and the specification information such as the characteristic value of the buffer as the component designation information, the above-mentioned step 322 is executed.
For each signal that makes up the data bus,
A design information script including the above-mentioned specification information as the component designation information is created.

When these design information scripts are sequentially input to the script discriminating unit 221, a negative determination is made in step 321. Accordingly, the script discriminating unit 22 is responded to.
1 determines whether or not specification information is included as the component designation information (step 323), and in the case of affirmative determination, it is determined that specific component allocation is necessary, and the corresponding design is performed. The information script may be sent to the component allocation unit 223.

Here, in the component allocating unit 223 shown in FIG. 6, the library searching unit 225 determines from the component library 224 described above based on the specification information included as the component designation information in the received design information script. The component information indicating the specific component is searched (step 324),
The search result is sent to the component information replacement unit 226.

At this time, the library retrieving unit 225 retrieves, as the component information, the component name such as the damping resistor d1 and the information indicating the specific component realization method such as the specification of the module element to be used, and the component information replacing unit. It may be sent to 226. In response to this, the component information replacement unit 226
Replaces the component designation information included in the design information script received from the script discrimination unit 221 with the component information obtained in step 324, and replaces the component designation information (step 325). The script interpretation unit 21 uses the design information script obtained as the replacement result.
It suffices to provide the process of No. 5 and finish the process.

As described above, each part of the component allocating unit 223 operates according to the discrimination result by the script discriminating unit 221, so that the function of the component allocating unit 124 described in claim 4 is realized and the characteristic value is automatically used. It is possible to specifically allocate specific parts. As a result, for parts such as damping resistors, whose characteristics such as resistance value and accuracy are uniquely determined according to the operating frequency, etc., specific parts are assigned according to the specification of characteristic values. By automating, it is possible to eliminate the work of explicitly identifying the component name for each component, so that the work burden on the designer can be further reduced.

Also, in FIG. 6, the portion allocating section 2
31 designates the portion of the module element to be assigned as a component in accordance with the interpretation result by the script interpreting unit 215, supplies the assignment result to the processing of the component adding unit 218, and assigns the portion to the module element. The module information relating to the above is stored in the module information storage unit 232, and is used for the subsequent allocation processing of portions.

When the script interpreting unit 215 gives an instruction to add the resistance element included in the module element as a component, the portion allocating unit 231 first refers to the module information accumulating unit 232 and applies the relevant information. A module element including a portion may be searched, and an appropriate portion may be assigned according to the search result. Here, for a module to which at least one portion is assigned, module information including information indicating the net to which the portion of each module is connected and the number of assignable portions is stored in the module information storage unit 232. For example, based on this module information and the signal specification information specified by the design information script,
The portion allocation unit 231 can determine whether to adopt the search result.

At this time, the portion allocating unit 231 is applicable when it can be predicted that the net indicated by the module information and the signal indicated by the signal designating information of the design information script are physically sufficiently close to each other. It may be determined that the allocation to the module element is appropriate. For example, when allocating a buffer to be inserted into one of the signals of the data bus, if the retrieved module information includes information indicating another signal of the same data bus, the net corresponding to this module element and the inserted Since it can be expected that the net corresponding to the target signal is physically close enough, the portion of the corresponding module element may be assigned. On the other hand, if an appropriate module element is not found, a new module element may be assigned a portion.

As described above, the portion allocating unit 231 operates in accordance with the instruction from the script interpreting unit 215 while referring to the module information accumulating unit 232.
The function of the portion allocating means 125 described in claim 5 can be realized, and each portion in the module element can be automatically allocated as an additional component. Accordingly, in the design information script, it is possible to omit the cumbersome work of clearly indicating the portion to be assigned to each component, so that the work load on the designer can be further reduced and the time required for the design work can be shortened.

By the way, when the circuit is redesigned in response to the feedback from the mounting design of the printed circuit board, it may be necessary to inherit the part number given in the previous circuit design. There is also a demand for giving specific part numbers to main parts such as LSIs. Hereinafter, a method of controlling the operation of assigning the part number by the design information script will be described.

FIG. 8 shows the configuration of an embodiment of a printed circuit board circuit design system to which the invention of claim 9 is applied. In FIG. 8, the part number file 207 is the number history holding means 13
This is equivalent to No. 3, and is configured to store the part numbers assigned to the respective parts arranged in the printed circuit board in the previous circuit design. The electrical information reading unit 213 stores the part number file in this part number file. The contents of 207 are read out and provided to the processing of the number assigning unit 242 via the number history storage unit 241.

The number assigning unit 242, based on the interpretation result by the script interpreting unit 215, sends an appropriate part number to the corresponding netlist in the netlist table 212 directly or through the part adding unit 218. Is provided.

The design script file 203 is
As a design information script for specifying the equipment number to be given to a logical part such as an LSI, a design information script including identification information for specifying a part to be given a part number and a specific number to be assigned is stored. . FIG.
A flow chart showing the part number assigning operation is shown in FIG.

For example, when the design information script relating to the pin assignment in the LSI includes the information relating to the number assignment, the number assigning unit 242 forces the part number in accordance with the input of the interpretation result including the designated number. It is determined to be designation (affirmative determination in step 331). in this case,
The number assigning unit 242 is the compulsory assigning means 13 described in claim 9.
4, the net search table 217 is directly accessed based on the search by the net search unit 217, and the specified part number is written in the net list indicated by the search result (step 332). Should be given to the corresponding parts.

Next, the number assigning unit 242 may reflect the assignment result in the number history storage unit 241 (step 333), terminate the number assigning process, and use it for the assigning process of the connector pin. On the other hand, in the case of the negative determination in step 331 described above, the number assigning unit 242 determines whether or not the target component has already been assigned a component number (step 33).
4) In the case of negative determination in step 334, the number history storage unit 241 described above is referred to and it is determined whether or not there is a component number assigned in the previous circuit design (step 335).

Here, for example, in the case of performing processing for a design information script that describes an electrical component to be added,
Since a new netlist is created by the component adding unit 218 in accordance with this interpretation result, the above step 3 is performed.
The negative determination of 34 is made, and the determination processing of step 335 is performed.

When the corresponding component is included in the previous circuit design result, the affirmative determination is made in step 335 described above, and accordingly, the number assigning section 242 causes the number history reflecting means 135 described in claim 9. And sends the component number obtained from the number history storage unit 241 to the component addition unit 218 (step 336), and then at step 333, after the allocation result is reflected in the number history storage unit 241, the component number allocation is performed. All that is required is to end the processing.

At this time, the component adding unit 218 adds the number assigning unit 2 to the netlist created corresponding to the relevant component.
By writing the part number obtained from 42, the part number in the previous electrical design can be inherited as the part number of the corresponding part. On the other hand, when a new circuit design is performed or a new component is added to the previous circuit, the negative determination is made in step 355, and the number assigning unit 242 creates a new component number for the additional component and It is sent to the adding unit 218 (step 357), and step 3
In 53, after the allocation result is reflected in the number history storage unit 241, the part number allocation processing may be ended.

In this case, the number assigning unit 242 creates a new component number by adding a number indicating the order of appearance to a code indicating the type of component to be added, and the component adding unit 218.
You can send it to. At this time, the number assigning unit 242 refers to the number history storage unit 241 and searches the part number including the corresponding code for the one that includes the maximum number, and uses the number that follows this number to create a new part number. Should be created.

Further, in response to this, the parts adding section 218
However, by writing the above-mentioned new part number in the newly created netlist, the added part can be given a part number that does not overlap with the part included in the previous electrical design. In this way, it is possible to automatically assign the part number in consideration of the forced assignment of the part number and the inheritance of the part number history. It is possible to prevent the occurrence of mistakes such as incorrect mounting, and it is possible to more efficiently proceed the design work of the printed circuit board circuit.

As described above, by representing the printed circuit board circuit as a set of netlists, it becomes possible to specify the mounting conditions such as the wiring length and the allowable delay time for the logical net. Hereinafter, a method of designating a mounting condition for a logical net will be described. FIG. 10 shows an embodiment of the printed circuit board circuit design system of claim 6.

In FIG. 10, the mounting condition setting unit 243 corresponds to the mounting condition setting unit 127 described in claim 6, receives information on the mounting condition from the script interpreting unit 215, and stores it in the specified netlist. It is configured to add mounting conditions. In this case, as a design information script for designating the mounting condition, a design information script including condition information indicating the mounting condition itself and target information designating a logical net to which the mounting condition is applied. Should be created and stored in the design script file 204.

Further, in response to the input of the design information script including the mounting condition, the script interpreting unit 215 instructs the net searching unit 217 to search the net list specified by the target information described above, It may be sent to the mounting condition setting unit 243. That is, the design information script including the mounting conditions stored in the design script file 203 is input to the mounting condition setting unit 243 via the electrical information reading unit 213 and the script interpreting unit 215. Each unit is configured to realize the function of the mounting condition input unit 126.

Here, in the design information script, for example, by designating the signal name used in the logic design of the printed circuit board as the target information, it is possible to indicate the logical signal line itself, and to specify the LSI etc. By indicating the combination of the terminal names of the logic elements, the logical start and end points of the net can be designated.

As described above, the netlist is
Since the terminal name of each LSI and the connected signal name are associated with each other, the net search unit 217 operates based on the designated target information, so that the corresponding net list is retrieved from the net list table 212. It is possible to search and use for the processing of the mounting condition setting unit 243. According to the search result thus obtained by the net search unit 217, the mounting condition setting unit 243 accesses the netlist table 212 and adds the condition information received from the script interpretation unit 215 to the corresponding netlist. For example, it is possible to specify the mounting conditions for a logical net.

As a result, it becomes possible to specify the mounting conditions for the entire logical signal line regardless of various components inserted in the middle, and for example, a net that can be traced from a specific signal name can be specified. It is possible to specify the allowable delay time when the signal is transmitted. In this way, by specifying the mounting conditions for the logical net, it is possible to reduce the restrictions imposed on the mounting design work and increase the degree of freedom, so that the time required for mounting design can be shortened. You can

Furthermore, in the design information script, for example, if a plurality of signal names forming the data bus are designated by the target information, the mounting conditions can be designated collectively for the group of these signals. . in this case,
The mounting condition setting unit 243 may set the same condition information for each net list searched by the net search unit 217.

As a result, it is possible to simply describe the mounting conditions for the data bus composed of a large number of signal lines, so that the work load on the designer can be further reduced.

By the way, among the components mounted on the printed circuit board, there are some components such as a combination of a light emitting diode and a light receiving element, whose function is difficult to be represented unless the representation by the circuit diagram is used. Next, a method of handling the parts represented by the circuit diagram will be described. In FIG.
8 shows an embodiment of the printed circuit board circuit design system of claim 7.

In FIG. 11, the circuit diagram database 24
Reference numeral 4 corresponds to the circuit diagram storage means 128 described in claim 7, and the circuit diagrams representing the components as described above are registered in correspondence with the component names. Further, the circuit diagram reading unit 245 is configured to read the circuit diagram corresponding to each component stored in the circuit diagram database 244, extract information regarding the connection of these components, and register the information in the component table 214. .

At this time, the circuit diagram reading section 245 extracts, for example, the terminal information indicating the input terminal and the output terminal from the circuit diagram of each component, and extracts these information and the corresponding circuit diagram data in the circuit diagram database 244. A component macro script including the circuit diagram designation information shown may be created and sent to the component table 214. In addition, the parts addition unit 218
When the component macro script including the circuit diagram designation information is received via the component search unit 216, the circuit diagram designation information is added to the netlist created corresponding to the relevant component, It suffices to show that the details are represented by a circuit diagram.

In this case, the table output unit 204 retrieves the corresponding circuit diagram from the circuit diagram database 244 based on the circuit diagram designation information added to the netlist, and along with the above-mentioned parts list and connection table, This circuit diagram may be printed out. As described above, the circuit diagram reading unit 245
Creates a component macro script corresponding to the circuit diagram of each component registered in the circuit diagram database 244 and stores the component macro script in the component table 214, thereby storing the connection information described in claim 7. Means 1
29 functions can be realized, and the components represented by the circuit diagram can be inserted into the netlist.

As a result, it is possible to directly use a combination of a light emitting diode and a light receiving element and the like expressed in a circuit diagram similar to the conventional one. Moreover, such a part can be described in a part macro script. It can be incorporated into the netlist just like any other component. In this case, for parts that are easier to express in a circuit diagram,
Since the conversion work to the component macro script can be omitted, it is possible to further reduce the burden on the designer.

Further, instead of providing the circuit diagram reading section 245, the designer prepares a component macro script corresponding to the above circuit diagram for necessary components among the components represented by the circuit diagram. The component macro scripts corresponding to these circuit diagrams may be read together with other component macro scripts and stored in the component table 214.

[0101]

As described above, according to the present invention, it is possible to represent the connection relation of each component as a set of netlists based on the script describing each component and the connection relation between the components. is there. As a result, the work of creating a circuit diagram that represents a printed circuit board circuit can be replaced with the script creation work described above, and the work load on the designer can be greatly reduced. Can be more logically presented to the user.

Further, by applying the invention of claim 2 and utilizing the connection information obtained in the LSI design, it becomes possible to omit the logic design work of the printed circuit board, and the designer can carry out the electrical design work. Since it is possible to concentrate, the time required for the design work of the printed circuit board can be greatly shortened. Further, if the inventions of claims 3 to 5 are applied, work of adding the same part to a signal group such as a data bus, work of allocating parts according to characteristic values, work of allocating portion from module parts, etc. Can be performed automatically, and the automation of electrical design can be promoted, and the work load on the designer can be greatly reduced.

In addition, by applying the invention of claim 6 and setting the mounting condition in the corresponding netlist in response to the input of the design information script including the mounting condition, the electrical components inserted in the respective signals are Regardless of the presence or absence, it becomes possible to set the mounting conditions for the logical net corresponding to the signal, and it is possible to remove the constraint imposed on the mounting design work and give the maximum degree of freedom.

On the other hand, by applying the invention of claim 7 and expressing the parts hierarchically with the script and the circuit diagram, the expression by the circuit diagram is more like the combined part of the light emitting diode and the light receiving element. Appropriate parts can be treated like any other part. Further, by applying the invention of claim 8 and giving a part number to each part to create a connection table and a parts list, the designer can be provided with sufficient information for the verification work of the printed circuit board. In particular, by applying the invention of claim 9 and controlling the part number given to each part,
According to the feedback from the packaging design, the verification work of the printed circuit board circuit in the case of the redesign can be made easier.

[Brief description of drawings]

FIG. 1 is a principle block diagram of a printed circuit board circuit design system according to claims 1 to 6;

FIG. 2 is a principle block diagram of the printed circuit board circuit design system according to claims 7 to 9;

FIG. 3 is a diagram showing an embodiment of a printed circuit board circuit design system according to claim 1;

FIG. 4 is an explanatory diagram of a net list.

FIG. 5 is a flowchart showing a basic operation of electrical design.

FIG. 6 is a main part configuration diagram of a printed circuit board circuit design system to which the inventions of claims 3 to 6 are applied.

FIG. 7 is a flowchart showing an automatic design operation of a printed circuit board circuit.

FIG. 8 is a diagram showing an embodiment of a printed circuit board circuit design system according to claim 9;

FIG. 9 is a flowchart showing a part number assigning operation.

FIG. 10 is a diagram showing an embodiment of a printed circuit board circuit design system according to claim 6;

FIG. 11 is a diagram showing an embodiment of a printed circuit board circuit design system according to claim 7;

FIG. 12 is a diagram showing a configuration example of a conventional printed circuit design CAD system.

[Explanation of symbols]

 111 Logical Connection Information Input Means 112 Logical Net Creation Means 113 Net List Storage Means 114 Component Information Storage Means 115 Design Information Input Means 116 Component Net Creation Means 117 Net List Updating Means 121 Design Information Storage Means 122 Script Expansion Means 123 Component Feature Storage Means 124 parts allocating means 125 portion allocating means 126 mounting condition inputting means 127 mounting condition setting means 128 circuit diagram storing means 129 connection information storing means 131 number assigning means 132 table creating means 133 number holding means 134 forced assigning means 135 number history reflecting means 201 Connection information file 202 Component macro file 203 Design script file 204 Design file creation unit 205 Design data file 206 Table output unit 207 Part number file 211 Connection information Reading unit 212 Net list table 213 Electrical information reading unit 214 Parts table 215 Script interpreting unit 216 Parts searching unit 217 Net searching unit 218 Parts adding unit 219 Pin assigning unit 221 Script discriminating unit 222 Script expanding unit 223 Component assigning unit 224 Component library 225 Library search unit 226 Component information replacement unit 231 Portion allocation unit 232 Module information storage unit 241 Number history storage unit 242 Number allocation unit 243 Mounting condition setting unit 244 Circuit diagram database 245 Circuit diagram reading unit 401 Drawing data library 402 Drawing instruction input unit 403 Drawing processing unit 404 Display processing unit 405 Display

Claims (9)

[Claims] 1. A logical connection information input means for inputting a logical connection script for describing a connection relationship of logical parts including an LSI in a predetermined format, and a netlist corresponding to each logical part based on the logical connection script. A logic net creating means for creating and showing a connection relationship of signals transmitted and received between the respective logic parts, a net list storing means for storing a net list corresponding to each part, and a configuration of each electric part in a predetermined format. Design information that describes, in a predetermined format, a component information storage unit that stores the described component macro script as component information corresponding to the component name, component designation information that indicates the electrical component to be added, and connection destination information that indicates the connection destination. Design information input means for inputting a script, and corresponding to the added electrical component based on the component macro script and the design information script. It is indicated by the design information script by using a component net creating means for creating a netlist and adding it to the netlist storing means, and information indicating the connection relationship to the netlist added by the component net creating means. A printed circuit board circuit design system comprising: a netlist updating means for updating a netlist corresponding to a connection destination. 2. The printed circuit board circuit design system according to claim 1, wherein the logical connection information input means is HDL (H) created at the time of operation verification work for a plurality of LSIs at the LSI design stage.
A printed circuit board circuit design system characterized by receiving connection information in ardware description language) and inputting it as a logical connection script. 3. The printed circuit board circuit design system according to claim 1, wherein the design information input means stores design information storage means for storing a design information script, and a plurality of signals as connection destination information from the design information storage means. A printed circuit board, which is configured to receive a designated design information script, generate a design information script for each of the plurality of connection destinations, and provide a script expanding unit for processing the component net creating unit. Design system. 4. The printed circuit board circuit design system according to claim 1, wherein a component characteristic that stores characteristic information including respective characteristic values corresponding to a component name indicating each component registered in the component information storage means. The design information input means includes a storage means, a design information storage means for storing a design information script, and a design information script in which feature information of a component is designated as component designation information from the design information storage means, and 2. A printed circuit board circuit design system, comprising: a component allocating unit that retrieves a component name corresponding to the characteristic information from a storage unit and uses it for processing of a component net creating unit. 5. The printed circuit board circuit design system according to claim 1, wherein the design information input means is a design information storage means for storing a design information script, and a plurality of electric parts as part designation information from the design information storage means. Receiving a design information script designating a module component including a portion as a portion, and based on the component information corresponding to the module component and the information about the set of netlists stored in the netlist storage means, an appropriate portion of the module component. And a portion allocating means which is used for the processing of the component net creating means, the printed circuit board circuit design system. 6. The printed circuit board design system according to claim 1, further comprising: a condition design script in which a net designating information designating a logical net and condition information indicating a mounting condition for the net are described in a predetermined format. And a mounting condition setting unit that searches the netlist storage unit for a netlist designated by the net designation information and adds the mounting condition indicated by the condition information. Printed circuit board design system. 7. The printed circuit board circuit design system according to claim 1, wherein the component information storage means is a circuit diagram storage means for storing circuit diagram data representing a configuration of a component by a circuit diagram, and the circuit diagram data Connection information storage means for storing a part macro script describing in a predetermined format the terminal information relating to the connection terminals of the part and the circuit diagram designation information indicating the circuit diagram data corresponding to the part name indicating the part. The component net creation means detects the circuit diagram designation information from the component macro script corresponding to the component designated by the design information script, and creates a net list including the circuit diagram designation information. A printed circuit board circuit design system having the following configuration. 8. The printed circuit board circuit design system according to claim 1, wherein the net list created by the logic net creation means and the part net creation means is assigned a different part number, and a net list is provided. Based on the netlist stored in the storage means and the part information stored in the part information storage means, a connection table showing the connection destinations of the terminals provided in each part, a part number and a part name for all parts A printed circuit board circuit design system comprising: a table creating means for creating a parts list showing information including information. 9. A printed circuit board circuit design system according to claim 8, wherein number history holding means holds, as history information, a part number given at the time of the previous design, corresponding to information for specifying each part. The number assigning means includes a force assigning means for assigning the part number to the corresponding netlist according to the input of the design information script in which the part number is designated together with the part designation information, and a design not including the part number designation. Number history reflection means for referring to the history information of the number history holding means in response to the input of the information script and preferentially giving the part number indicated by the history information to the netlist corresponding to each corresponding part. A printed circuit board circuit design system comprising: