JPH09259174A - Device for collating circuit diagram db and substrate db - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for collating a circuit diagram DB and a substrate DB by recognizing as coincidence when a circuit factor such as a circuit element, a gate circuit inside the circuit element or the pin number of the gate circuit is replaced with the other circuit element, gate circuit or pin number respectively normally replacable. SOLUTION: A reference data extracting means 50 generates a reference DB 30 based on the data registered in a circuit diagram DB 10 and a parts DB 20. An inequality element extracting means 60 extracts an unequal element by comparing a circuit diagram net list 10a in the circuit diagram DB 10 with a substrate net list 40a in a substrate DB 40 and referring to them. A practical equality deciding means 70 decides whether this unequal element is practically an equal element or not based on data stored in the reference DB 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collating device for collating a circuit diagram DB (database) with a substrate DB to detect a mismatched portion between the circuit diagram netlist and the substrate netlist, and more particularly to a circuit element, If the gate circuit in the circuit element, or the pin number of the gate circuit, is replaced with another electrically equivalent circuit element, gate circuit, pin number, etc. The present invention relates to a matching device for a circuit diagram DB and a board DB that is recognized as a matching portion.

[0002]

2. Description of the Related Art Conventionally, in order to confirm that a circuit board created based on a circuit diagram is completed as shown in the circuit diagram, as shown in FIG. The comparison and comparison with 82 is performed. Until now, circuit elements, gate circuits in the circuit elements, pin numbers of the gate circuits, etc. (hereinafter, these may be collectively referred to as “circuit elements”) are connected as shown in the circuit diagram 82. In order to confirm whether or not there is any, a worker chased the wiring on each drawing using a colored pencil or the like. However, such visual confirmation and manual confirmation not only impose a heavy burden on the operator, but also have a problem that there are many omissions and mistakes in confirmation.

On the other hand, in recent years, a board design technique using a CAD system has advanced, and circuit diagrams and connection information between circuit elements on a board have been accumulated in a database (DB). In the official gazette, FIG.
As shown in FIG. 6, a collation method for automatically detecting a mismatched portion between the circuit diagram and the board by comparing and collating the circuit diagram netlist obtained from the circuit diagram DB with the board netlist obtained from the substrate DB is provided. Proposed.

[0004]

As is well known,
For example, a dual in-line package (DIP) type IC (for example, TTL-IC or CMOS-IC) includes a plurality of identical gate circuits, and each gate circuit has a different input pin number or output pin number. It is electrically equivalent. FIG. 10 shows the structure of a 74LS00 type TTL, which has different pin numbers but is electrically equivalent.
Contains two NAND gates.

In designing the board, the gate circuits are changed from one in the DIP (U1) to another as shown in FIG. One of the DIPs (U2) is replaced with one, or the gate circuit is replaced with the same DIP (U2) as shown in FIG.
Replaced with another gate circuit in 1), or the same figure
As shown in (c), the input positions (pin numbers) of the multi-input gate circuit may be exchanged with each other.

As described above, when the circuit element such as the IC, the gate circuit in the IC, or the pin number of the gate circuit is replaced with another electrically equivalent circuit element, the circuit diagram DB and the board are displayed on the netlist. Although it does not match the DB, it does not matter if it is determined to be substantially the same. However, in the above-described conventional technique, even if such electrically equivalent regular replacement is determined as a mismatch, there is a problem that it is necessary to reconfirm visually and manually by an operator. there were.

An object of the present invention is to solve the above-mentioned problems of the prior art and to replace other circuit elements such as a circuit element, a gate circuit in the circuit element, or a pin number of the gate circuit with each other. It is an object of the present invention to provide a collation device of a circuit diagram DB and a substrate DB that does not determine that a circuit element, a gate circuit, a pin number or the like does not match when it is replaced.

[0008]

In order to achieve the above-mentioned object, the present invention is characterized in that the following means are taken. (1) Each circuit element based on the circuit diagram DB (circuit element, gate circuit in circuit element, pin number of gate circuit, etc.)
Circuit diagram netlist in which connection information of the
Substrate netlist on which connection information of each circuit element based on B is recorded is compared with each of the netlists and electrically replaced by a mismatch element extraction means for extracting a mismatch of connection information in circuit element units. A reference DB that stores a correspondence relationship between possible circuit elements and a determination unit that determines whether or not the non-matching elements are the replaceable circuit elements are provided based on the reference DB. (2) The determination means is configured to further determine the connection relationship between the replaced circuit element and the signal input source and signal output destination of the circuit element.

According to the above-mentioned structure (1), each circuit element such as the circuit element, the gate circuit in the circuit element, or the pin number of the gate circuit is replaced or changed to change the circuit diagram DB and the board D.
Even if B does not match, if it is performed while maintaining electrical equivalence, it is possible to make a substantial match determination.

According to the above configuration (2), although the mismatch between the circuit diagram DB and the substrate DB is the result of a connection error or the like, the mismatch partially happens to maintain electrical equivalence. In the case where it is carried out as it is, we do not recognize this as a substantial agreement.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a functional block diagram of a circuit diagram DB / board DB collating device according to an embodiment of the present invention. The component DB 20 stores information about all the circuit elements, for example, the TTL of the circuit element, regardless of whether or not the circuit element is used in the circuit to be collated.
In the case of a DIP type IC such as -IC or CMOS-IC, the input pin number and the output pin number of the gate circuit incorporated therein are registered.

More specifically, in the component DB 20, the correspondence between the input pin number (A, B) and the output pin number (Y) of the gate circuit built in each circuit element (circuit element; IC). The relationship is registered in advance. For example 74
The LS00 type IC has a built-in gate circuit in which pins 1 and 2 are input terminals and pin 3 is an output terminal, and gate circuits in which pins 4 and 5 are input terminals and a pin 6 is an output terminal. In the 74LS04 type IC, a gate circuit in which pin 1 is an input terminal and pin 2 is an output terminal, and a gate circuit in which pin 3 is an input terminal and pin 4 is an output terminal ... It is registered that is built in. The circuit element “74LS0 in the component DB 20
The information "A = B" registered for "0" indicates that the input pins A and B of each gate circuit are electrically equivalent even if they are exchanged with each other.

In the circuit diagram DB 10, an element classification list 10b in which all the circuit elements (U5, U6 ...) Used in the circuit to be collated are classified by the circuit component name, and the circuit representing the connection contents between the circuit elements. The diagram net list 10a and the like are registered in advance. More specifically, in the element classification list 10b, for example, the circuit elements U5, U6, U7 are all 74LS00 type ICs (TTL) and the circuit elements U10, U.
It is registered that all 11 are 74LS04 type ICs ... And the circuit element (IC) is included in the circuit diagram netlist 10a.
The U3 pin 3 and the circuit element U5 pin 4 are NET
It is connected by (wiring) A, and the 6th pin of the circuit element (IC) U5 and the 1st pin of the circuit element U10 are connected by NETB.

In the board DB 40, the board net list 40a and the like, which is obtained from the CAD data and represents the connection relationship between the circuit elements on the board, is registered in advance. As will be described later with reference to FIG. 2, the reference data extracting unit 50 selects only the data regarding the circuit element used in the circuit to be collated from the component DB 20, based on the data registered in the circuit diagram DB 10 and the component DB 20. It is extracted and stored in the reference DB 30. Mismatch element extraction means 6
0 is the circuit diagram netlist 10a and the board netlist 4
The non-matching elements of the both are extracted by comparing with 0a. The substantial match determining means 70 determines whether or not the extracted non-matching element is a substantially matching element based on the data stored in the reference DB 30, and outputs the determination result 80.

Next, the operation of the above configuration will be described with reference to the flow chart. First, the reference DB
The operation of the reference data extracting means 50 for storing data in 30 will be described with reference to the flowchart of FIG.

In step S101, the circuit elements registered in the element classification list 10b of the circuit diagram DB 10 are read one by one. In the present embodiment, the description will be continued assuming that the circuit element name “74LS00” is first read. In step S102, this circuit element name "74LS
It is determined whether or not "00" is registered in the parts DB 20, and here it is determined that it is registered and step S1
Go to 03. In step S103, this circuit element 74
Information registered in the circuit diagram DB 10 and the component DB 20 regarding LS00 is written in the reference DB 30.

That is, in the present embodiment, as shown in FIG. 1, the circuit elements U5, U6 and U7 are all 74LS00 type ICs. In 74LS00, pins 1 and 2 are input and pin 3 is output. That the gate circuits 4 and 5 are input and the pin 6 is output, and that the input pins of each gate circuit are interchangeable (A = B), Is registered in the reference DB 30 as information regarding the circuit element 74LS00.

In step S104, it is determined whether or not the above processing has been completed for all the circuit elements registered in the element classification list 10b of the circuit diagram DB 10. Here, it is determined that the processing has not been completed, and thus step S101.
Return to the next circuit element, that is, the circuit element name "74
The above process is repeated for the IC of LS04 ″. As described above, the element classification list 10 of the circuit diagram DB 10
When the above process is completed for all the circuit elements registered in b, the reference DB 30 is completed.

Next, using this reference DB 30, the circuit diagram netlist 10a of the circuit diagram DB 10 and the substrate DB 40 are used.
The operation of comparing and collating with the board netlist 40a will be described with reference to the flowchart of FIG. Here, as shown in FIGS. 5, 6 and 7, two 2-input NANDs are used.
The collating operation for the circuit portion including the gate and the two inverters will be described. Further, as shown in FIG. 4, the circuit elements U5 and U6 are both four 2-input NANDs.
It is an IC of the same type having a built-in gate, and the circuit element U10 is an IC having six built-in inverters. Therefore,
For example, in the circuit configuration of FIG. 5 (a), the third and fourth pins of the circuit element U5 of FIG. 4, the fourth pin of U10 and the fifth pin of U5, the sixth pin of U5 and the first pin of U10 are respectively connected. Will be.

First, as shown in FIG. 5, in the circuit diagram [(a) of the same figure], the gate circuit in which the fourth and fifth pins of the circuit element U5 are input terminals and the sixth pin is an output terminal, On the substrate [(b) of the same figure], the collating operation when the circuit elements U6 are replaced with other gate circuits having pins 4 and 5 as input terminals and pin 6 as output terminals will be described.

In step S201, the first line (U5-3, U5-4) of the circuit diagram netlist (NL) 10a.
And the first line of the board netlist 40a (U5-3, U
6-4) is compared with the mismatch element extraction means 60. In step S202, the comparison result is referred to. Here, the output destination element registered on the right side of each of the lists 10a and 40a is "U" in the circuit diagram netlist 10a.
5 "while the board netlist 40a shows" U "
Since it is 6 ", it is determined that they do not match, and thus step S301.
Proceed to.

In step S301, the data about the circuit element "U5" in the circuit diagram netlist 10a, which is determined to be inconsistent, is referred to by the substantial coincidence determining means 70.
It is read from B30. In step S302, it is determined whether or not the mismatch is based on replacement with another electrically equivalent circuit element. Specifically, the circuit element "U" in the board netlist 40a that is determined to not match.
6 "is a reference DB as a replacement target of the circuit element" U5 "
It is determined whether or not it is registered in 30. In the present embodiment, as shown in FIG. 1, it is registered in the reference DB 30 that the circuit elements U5 and U6 are both 74LS00, and therefore the replacement of the circuit element U5 with the circuit element U6 is electrically equivalent. Is determined to be a regular replacement, and step S303 is performed.
Proceed to. If the determination in step S302 is negative, the process proceeds to step S310 to make an error determination, and a determination result 80 to that effect is output.

By the way, as described above, when the replacement of the circuit element U5 with the circuit element U6 is determined to be a regular replacement, the non-matching elements of the netlists 10a and 40a are determined to be substantially matching elements. It is good, but in such a comparison of only disagreement elements, for example, even if the disagreement is the result of a connection mistake or the like, but this accidentally satisfies the pre-replacement condition, it is also determined as a match. Sometimes. Therefore, in this embodiment, step S30 described later is performed.
After 3, the input source element and the output destination element of each element determined to be substantially the same are further compared, and only when they are all matched, the non-matching element is determined to be the substantially matching element. , Achieves more reliable matching.

In step S303, the input source elements of the circuit element U5 in the circuit diagram netlist 10a and the circuit element U6 in the board netlist 40a are compared. In the present embodiment, since the two input source elements of each of the circuit elements U5 and U6 are "U5-3" and "U10-4", a match determination is made in step S304, and step S3 is performed.
Go to 05. In step S306, the output destination elements of the circuit elements U5 and U6 are compared this time, and in the present embodiment, the output destination elements of the circuit elements U5 and U6 are both "U10-".
Since it is 1 ", a match determination is made in step S306, and then the process proceeds to step S203.
Then, it is determined whether or not the comparison / reference has been completed for all the lines of each netlist, and if not completed, the process returns to step S201 and the next line is compared / referenced.
If it is completed, a match determination is made in step S204, and a determination result 80 to that effect is output.

Then, as shown in FIG. 6, in the circuit diagram [(a) of the same figure], the gate circuit having pins 4 and 5 of the circuit element U5 as an input terminal and a pin 6 as an output terminal is a substrate. Referring to FIG. 3 (b), refer to the flow chart of FIG. 3 again for the verification operation when the circuit element U5 is replaced with a gate circuit having pins 9 and 10 as input terminals and pin 8 as output terminals. And explain.

In step S201, the first line (U5-3, U5-4) of the circuit diagram netlist 10a and the first line (U5-3, U5-9) of the substrate netlist 40a.
And are compared as above. In step S202, the comparison result is referred to. Here, the output destination element registered on the right side of the list is U in the schematic netlist 10a.
Board netlist 40a, while pin 5 is pin 4
Then, since it is the 9th pin of U5, it is determined that they do not match and the process proceeds to step S301.

In step S301, the data relating to the fourth pin of the circuit element U5 in the circuit diagram netlist 10a which is determined to be inconsistent is read from the reference DB 30. In step S302, the circuit element “Pin 9 of U5” in the board netlist 40b determined to be inconsistent is the reference DB 30 as a replacement target of the circuit element “Pin 4 of U5”.
It is judged by the substantial coincidence judging means 70 whether or not it is registered in.

In this embodiment, as illustrated in the reference DB 30 of FIG. 1, the circuit element U5 (74LS00) has 4,
It is registered that a gate circuit that uses pin 5 as an input terminal and pin 6 as an output terminal, as well as a gate circuit that uses pins 9 and 10 as an input terminal and pin 8 as an output terminal, is built in. , And the other input pin number and output pin number are compared. In the present embodiment, since the fourth, fifth, and sixth pins of the device U5 in the circuit diagram netlist 10a are all replaced by the ninth, tenth, and eighth pins of the device U5 in the board netlist 40b, the replacement is electrical. It is determined that the normal replacement is equivalent to the normal replacement, and the process proceeds to step S303.

After step S303, the elements U5 4, 5 of the circuit diagram netlist 10a,
Connection destination of pin 6 and element U in the board netlist 40b
It is determined whether or not the connection destinations of the 9th, 10th, and 8th pins of 5 match each other, and if they match, it is determined to be a regular replacement.

Next, as shown in FIG. 7, in the circuit diagram [(a) in the figure], the fourth pin out of the fourth and fifth pins of the circuit element U5 is connected to the third pin. Then, on the board [(b) of the same figure], the verification operation when the 4th pin of the circuit element U5 is connected to the 3rd pin and the 4th and 5th pins of the circuit element U5 are exchanged with each other The description will be made again with reference to the flowchart of FIG.

In step S201, the first line (U5-3, U5-4) of the circuit diagram netlist 10a and the first line (U5-3, U5-5) of the substrate netlist 40a.
And are compared as above. In step S202, the comparison result is referred to. Here, the output destination element on the right side of the list is "U5-4" in the circuit diagram netlist 10a, whereas the board netlist 40a is
Since it is "U5-5", it is determined that they do not match and the process proceeds to step S301.

In step S301, the data relating to the circuit element "U5" in the circuit diagram netlist 10a which is determined to be inconsistent is read from the reference DB 30. In step S302, it is determined whether or not the mismatch is based on replacement with another electrically equivalent circuit element. Specifically, the board netlist 40a determined to be inconsistent
The circuit element "Pin No. 5 of U5" is the circuit element "U5".
It is determined whether or not it is registered in the reference DB 30 as a replacement target of “No. 4 pin”.

In this embodiment, as illustrated in the reference DB 30 of FIG. 1, the U5 (74LS00) has a built-in two-input gate circuit whose input terminals are pins 4 and 5, and each input terminal is Since the information (A = B) indicating that the input terminals can be exchanged with each other is registered, the exchange of the input terminal is determined to be an electrically equivalent regular replacement, and step S3 is performed.
Go to 03.

After step S303, the elements U5 of the circuit diagram netlist 10a, 4, 5 and
Connection destination of pin 6 and element U in the board netlist 40b
It is determined whether or not the connection destinations of the 5th, 4th, and 6th pins of 5 match, and if they match, it is determined that the replacement is normal.

As described above, according to the present embodiment, even if there is a mismatch element between the circuit diagram netlist 10a and the board netlist 40a, this mismatch can be replaced with another electrically equivalent circuit element. If it is based on it, it is automatically judged as a matching element, so it is not necessary for the operator to check again for inconsistencies such as design changes, so not only the efficiency of comparison work is improved, but also its reliability. Also improves.

Further, according to the present embodiment, the matching determination is also performed on the circuit elements of the input source and the output destination of the circuit elements determined to be the regular replacements, so that the reliability is further improved. improves.

[0037]

【The invention's effect】

(1) According to the invention of claim 1, the circuit element, the gate circuit in the circuit element, or the pin number of the gate circuit is replaced,
Modified circuit diagram DB (circuit diagram netlist) and board D
Even if there is an apparent disagreement with B (board netlist), if it is performed while maintaining the electrical equivalence, the actual coincidence determination is made. Even if the substrate DB and the substrate DB apparently do not match, the match determination is automatically performed. (2) According to the invention of claim 2, even if the mismatch between the circuit diagram DB and the substrate DB is the result of a connection error or the like, even if the regular replacement condition is met accidentally, You will not be aware of the actual agreement.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is a flowchart showing a reference DB registration method.

FIG. 3 is a flowchart showing the operation of this embodiment.

FIG. 4 is a diagram showing an example of a structure of a DIP-IC.

FIG. 5 is a diagram showing an electrically equivalent replacement example.

FIG. 6 is a diagram showing an electrically equivalent replacement example.

FIG. 7 is a diagram showing an electrically equivalent replacement example.

FIG. 8 is a diagram showing a method of comparing a circuit diagram and a board according to a conventional technique.

FIG. 9 is a diagram showing a method for checking a circuit diagram netlist and a board netlist according to a conventional technique.

FIG. 10 is a diagram showing an example of a structure of a DIP-IC.

FIG. 11 is a diagram showing an electrically equivalent replacement example.

[Explanation of symbols]

10 ... Circuit diagram DB, 20 ... Component DB, 30 ... Reference DB,
40 ... Board DB, 50 ... Reference data extracting means, 60 ... Inconsistent element extracting means, 70 ... Substantial coincidence determining means

Claims (2)

[Claims] 1. A collation device for collating a circuit diagram DB and a substrate DB, wherein connection information of each circuit element (circuit element, gate circuit in circuit element, or pin number of gate circuit) based on the circuit diagram DB. The circuit diagram netlist in which is recorded, the circuit board netlist in which the connection information of each circuit element based on the circuit board DB is recorded, and the netlists are compared and referred to, and the mismatch of the connection information is extracted in circuit element units. An element extraction unit, a reference DB that stores a correspondence relationship between circuit elements that can be electrically equivalently replaced, and whether or not the non-matching elements are the circuit elements that can be replaced based on the reference DB A device for collating a circuit diagram DB and a substrate DB, comprising: a determination unit for determining. 2. The determining means further determines a connection relationship between the replaced circuit element and a signal input source of the circuit element and a signal output destination of the circuit element. Matching device for the circuit diagram DB and the substrate DB of.