JPH04130966A - Cad system - Google Patents

Abstract

PURPOSE:To attain clearance check within a short time by automatically executing minimum clearance check required in each designer's execution of a function generating the necessity of clearance check. CONSTITUTION:A clearance check part 6 reads out the contents of a clearance data base 13 through a file access part 9. A clearance check function has two cases, i.e. the display of all error marks and the display of error marks in an up-to-date changing part. When the display of the former case is selected, item records having 'bad' values in the 5th field in the data base 13 are displayed on a display 1 through a screen access part 8. When the display of the latter case is selected, item records having 'new' values in the 1st field and 'bad' values in the 5th field in the data base 13 are displayed on the display 1 through the access part 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to an LS ICAD CAD system board CA.
The present invention relates to a CAD system such as the D system, and particularly to a CAD system having a function of checking whether clearance is maintained when wiring, contact holes, etc. are arranged.

[Conventional technology] Conventionally, LSI CAD system, printed circuit board CAD
A CAD system such as a system has a command to execute a clearance check function as a command.
When that command was executed, the clearance check function was activated. In other words, the function of the conventional clearance check function is to read a design database that has already been designed for wiring and contact holes, and check whether all wiring and contact hole elements existing in the database satisfy the clearances specified by the design standards. As a result of the check, an error mark will be displayed on the display where the clearance is not met.

[Problems to be Solved by the Invention] However, in the conventional CAD system described above, when performing a clearance check, it is necessary to inspect a large number of clearances between elements in the design database, which increases the size of the design database. The disadvantage is that the longer the clearance check is done, the more time it takes to complete the clearance check.

Furthermore, if an element to be checked for clearance (wiring or contact hole) is added or the placement position is changed, the clearance between all elements in the design database must be checked again. Not only is it necessary to perform a clearance check each time, but it is also difficult to mark and display errors only for the changed portions of the elements subject to the clearance check.

The present invention improves these conventional drawbacks.The purpose of the present invention is to be able to perform clearance checks in a short time, and furthermore, to be able to perform clearance checks in a short period of time. Another object of the present invention is to provide a CAD system that can easily display clearance errors.

[Means for Solving the Problems] The CAD system of the present invention includes a database loading means for generating a design database holding each element, a placement and wiring means for adding or updating the elements in the design database, and a CAD system according to the design standards. and a clearance check means for comparing and checking the indicated clearance value with the clearance between the elements and storing the check result in a clearance database, the clearance check means comprising:
It is executed every time the aforementioned self-database loading means or the above-mentioned placement and routing means is executed, and when the user selects a clearance check, the clearance check is not performed on the elements within the design database, and the clearance check is performed on the elements within the clearance database. By referring to the clearance check results, only the clearance check results that were changed when executing the database load method or the placement and routing method or all the clearance check results can be searched, and a mark indicating a clearance error can be displayed between elements with clearance errors. It is supposed to be done.

[Function] In the present invention, the clearance check means is not independent of the database loading means or the placement and wiring means, but is executed each time these are executed. When a target element is added or the placement position is changed, clearance errors before and after these changes are displayed.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the CAD system of the present invention. Referring to FIG. 1, the CAD of this embodiment
The system includes a display that displays design information and command menus, an input section 2 that inputs commands, a command analysis section 3 that analyzes input commands, a database load section 4, and a layout and wiring section. Part 5 and
Clearance check section 6, screen access section 8, design standards 11 mainly necessary for clearance check section 6, component information 12 necessary for placement and wiring section 5, design database 1
0. It has a clearance database 13 and a file access section 9 that accesses the design data 14 and manufacturing data 15 required by the database loading section 4.

In this embodiment, when a command is input from the designer, the command analysis unit 3 determines the result and each corresponding function (
(database load section 4, placement and wiring section 5, clearance check section 6, screen access section 8, etc.), and each of these functions is controlled by the design database 1.
Information is exchanged by read/write access to o by the file access unit 9.

The feature of the CAD system of this embodiment is that the clearance check function is not independent like other functions as in conventional CAD systems, but the functions of the database loading section 4 and the placement and wiring section 5 are executed. The reason is that the clearance check section 6 is located at a position where it can be automatically executed when the clearance check is performed. Due to these characteristics, as described below,
The clearance check function automatically operates every time a situation requiring a clearance check occurs, making it possible to perform the minimum necessary checks.

Next, the operation of the CAD system having such a configuration will be explained.

FIG. 2 is a flowchart showing processing operations when a database load command is input from the input unit 2.

In FIG. 2, when a database load command is input, the database load unit 4 is executed, the database load unit 4 reads design data from the design data 14 (step 31), and loads the design database 10 through the file access unit 9. Generate (step 32).

For example, by reading design data for parts A and B, a design database as shown in FIG. 3(a) can be generated. In addition, in this design database, part A has a rectangle shape, and the lower left coordinates are (xi, yl) and the upper right coordinates are (x2.y2).
tern (pattern).

Next, a clearance check is performed on parts A and B (step 33), and the results are created as a clearance database as shown in FIG. 13 (step 34). In this example of the clearance database, design 1'' in the design standard ll as shown in Fig. 3(c) is used as the clearance check reference value, and the minimum clearance value of parts A and B is "x
3-x2" and this value satisfies the design standard value "4800", indicating that it is good.

Finally, the data is displayed on the display 1 through the screen access section 8 as shown in FIG. 3(d) (step 35).
In the display shown in FIG. 3(d), the coordinate values are not actually displayed on the display 1, nor are the dotted line portions displayed.

FIG. 4 is a flowchart showing the processing operation of the placement and wiring section 5.

The placement and wiring section 5 reads design data from the design database 10 through the file access section 9 (step 4).
1) Next, using the part C input by the designer from the input part 2 as a key, the part information 12 is sent through the file access part 9.
In step 42), the obtained data of part C is added to the design database 10.

(Step 43), FIG. 5(a) shows a specific example of this additional part information, and the information of part C to which the record of pattern C in the design database of FIG. 5(a) has been added. It is.

After updating the design database 10 in this way, the parts A to C in the design data 14 are updated based on the design criteria shown in FIG. 5(C), including the added part C and the previously existing part A. , performs a clearance check with part B, obtains the check result (step 44), updates the clearance database 13 (step 45),
In this way, for example, the contents of the clearance database shown in FIG. 3(b) can be updated as shown in FIG. 5(b). That is, first, the second field of the item record regarding parts A and B that was already in the clearance database 13 before the update is set to "old".
(set the existing clearance information flag), and set the second field of the item record regarding part C to "new" (set the new clearance information flag). 9 and reflected in the clearance database 13.

Next, the design data and the error mark of the clearance check result are displayed on the display 1 as shown in FIG. 5(d) through the screen access section 8 (step 46). In addition,
In FIG. 5(d), error marks are displayed only for those items which have a value of "bad" in the fifth field of the ite+s record as a result of the clearance check.

FIG. 6 is a flowchart showing the processing operation of the clearance check section 6.

The clearance check unit 6 reads the clearance database 13 through the file access unit 9 (step 51). There are two ways to do this: displaying the error mark for the latest changes, and displaying the error mark for the latest change. The designer selects the clearance check command using mouse 2 to select which one to use.If displaying all error marks is selected (step 52)
, the value of the fifth field of the item record on the clearance database 13 is displayed on the display 1 through the screen access section 8 after it is bad''.
Specific examples at this time are shown in FIGS. (a) to (d).

On the other hand, when it is selected to display an error mark for the latest changed part (step 53), the value of the first field of the ite Oboro record on the clearance database 13 is new and the value of the fifth field is "b".
ad'' is displayed on the display 1 through the screen access section 8. Specific examples of this are shown in FIGS. 8(a) to 8(d).

In this way, in this embodiment, the clearance check function is not made an independent function from other functions via the design database, but is automatically checked to the minimum necessary level each time the designer executes a function that requires a clearance check. Since the clearance check is performed, the clearance check can be performed in a short execution time.

Furthermore, when an element to be checked for clearance (wiring or contact hole) is added or the arrangement position is changed, the difference in clearance errors before and after these changes can be easily displayed.

The CAD system of this embodiment can also have functions other than the database loading function, placement and wiring function, and clearance check function, for example, it can also have a function of finally outputting manufacturing data 15. can.

[Effects of the Invention] As explained above, the present invention does not make the clearance check means an independent function from other means via the design database, but automatically performs the clearance check every time the designer executes a function that requires a clearance check. Since the minimum necessary clearance check is performed in a practical manner, there is an effect that the clearance check can be performed in a short execution time.

Furthermore, when an element to be checked for clearance (wiring or contact hole) is added or the arrangement position is changed, the difference in clearance errors before and after these changes can be easily displayed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the processing flow of the database loading means, and FIGS. 3(a) to (d) explain specific examples of the processing of the database loading means. FIG. 4 is a flowchart showing the processing flow of the placement and wiring means, FIGS. 5(a) to (d) are diagrams for explaining specific examples of the processing of the placement and wiring means, and FIG. Flowcharts showing the processing flow of the checking means, FIGS. 7(a) to (d) and FIGS. 8(a) to (d) are diagrams for explaining specific examples of the processing of the clearance checking means. In FIG. 1, 1...display, 2...input section, 3...command analysis section, 4...database loading section, 5...
Placement and wiring section, 6... Clearance check section, 8...
・Screen access section, 9...File access section, 10
...Design database, 11...Design standards, 12.
...Parts information, 13...Clearance database,
14...Design data, 15...Manufacturing data.

Claims (1)

[Claims] A database loading means that generates a design database that holds each element, a placement and routing means that adds or updates elements in the design database, and a check that compares the clearance value shown in the design standard with the clearance between elements. and a clearance check means for storing the check results in a clearance database, the clearance check means being executed every time the database loading means or the placement and wiring means are executed, and the clearance check means is configured to be executed every time the database loading means or the placement and wiring means is executed. When selecting a clearance check by , the elements in the design database are not checked for clearance, and by referring to the clearance check results in the clearance database, only the clearance check results that were changed when executing the database loading means or the placement and routing means or A CAD system characterized by searching all clearance check results and displaying a mark indicating a clearance error between elements with a clearance error.