JPH04113471A - Circuit element connection retrieving system - Google Patents

Abstract

PURPOSE:To reduce the analyzing man-hours of a circuit diagram to trace connection between hierarchies by automatically retrieving the connection between the hierarchies of a logic circuit, and displaying by emphasizing the terminal of the internal circuit of a connected hierarchy and a signal line. CONSTITUTION:The terminal names I1-I3, O1, and O2 of the opening of a macro 31 on a master circuit diagram 30 are instructed, and a slave circuit diagram 32 is read page by page to search terminals I1-I3, O1, and O2 with the same names as that of the terminals I1-I3, O1, and O2 instructed on the slave circuit diagram 32. A terminal name on a read slave circuit diagram 32 is read one by one, and it is checked whether or not an instructed terminal name coincides with a read terminal name. When coincidence is obtained, the read slave circuit diagram 42 is displayed, and the terminal I2 whose name coincides and the signal line L2 connected to the terminal are displayed by emphasizing on a displayed slave circuit diagram 42 by changing the color of them differently from the other, etc. In such a way, it is possible to reduce the man-hours in the analysis of the circuit diagram.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit element connection search method, and more particularly to a circuit element connection search method that traces the hierarchy of a logic circuit diagram and searches for connections therebetween.

[Conventional technology]

Conventionally, this type of search for connections between layers of a logic circuit diagram has been performed manually by turning over the logic circuit diagram page by page and tracing the connections between the layers.

[Invention or problem to be solved]

The conventional circuit element connection search method described above is performed manually, so for large-scale circuits, the number of circuit drawings becomes enormous.
Analyzing circuit diagrams that involve tracing connections between layers of a circuit increases the amount of man-hours required, and there are also disadvantages in that it may not be possible to make all the connections manually.

[Means to solve the problem]

The circuit element connection search method of the present invention is characterized by comprising a circuit element connection search mechanism that detects connections between the layers of a hierarchically designed logical circuit diagram and displays them on an output device, and The mechanism includes a connection search unit that automatically searches for connections between layers of logic circuits, and a circuit that highlights and displays on the output device by changing the color of terminals and signal lines of internal circuits in connected layers. It is characterized by having a figure display part.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the circuit element connection search method of the present invention.

In FIG. 1, 1 is an input/output device, 2 is an arithmetic processing unit,
Reference numeral 3 denotes a data storage device, and 4 a circuit element connection search mechanism, which is comprised of a connection search section 5 and a circuit diagram display section 6, which are realized by hardware or software.

FIG. 3 is a diagram showing an example of a macro in a logic circuit diagram hierarchically designed according to the embodiment shown in FIG. 1. A macro 31 exists in a parent circuit diagram 30, and the internal circuit of the macro 31 is It is expressed as 32.

FIG. 4 is a diagram showing an example of highlighted display of the child circuit diagram according to the embodiment shown in FIG. and the signal line L2 is highlighted.

Next, the operation of this embodiment will be explained.

FIG. 2 is a flowchart showing the operation procedure of the circuit element connection search mechanism in FIG.

First, the terminal name of the macro 31 cut on the parent circuit diagram 30■□
+I2+I3+O□, 02 in step 1), the terminal name 11. specified in step 1 on the child circuit diagram 32. I
2. I3, Ot, terminal 11 with the same name as 02. I2
．． The child circuit diagram is read page by page in order to search for I3, 01, and 02 (step 2).

The terminal names on the child circuit diagram 32 read here are read one by one (step 3), and it is checked whether the terminal name specified in step 1 matches the terminal name read in step 3 (step 4). If no match, step 3
Return to step 5, and if they match, proceed to step 5. Step 5
Now, display the child circuit diagram 42 loaded in step 2,
On the child circuit diagram 42 displayed in Step 5, the terminal 2 with the matching name in Step 4 and the signal line L2 connected to this terminal 2 are highlighted by changing the color from others (Step 6).

Incidentally, the procedure from step 1 to step 4 is processed by the connection search section 5, and the procedure of steps 5 and 6 is processed by the circuit diagram display section 6.

〔Effect of the invention〕

As explained above, the present invention automatically searches for connections between layers of logic circuits, and traces connections between layers by highlighting internal circuit terminals and signal lines of connected layers. This has the effect of reducing the number of steps needed to analyze such circuit diagrams.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the circuit element connection search method of the present invention, FIG. 2 is a flowchart showing the operation procedure of the circuit element connection search mechanism in FIG. 1, and FIG. 3 is the same as that shown in FIG. 1. FIG. 4 is a diagram showing an example of a macro of a hierarchically designed logic circuit according to the embodiment shown in FIG. 1... Input/output device, 2... Arithmetic processing unit, 3...
Data storage device, 4...Circuit element connection search mechanism, 5.
... Connection search section, 6... Circuit diagram display section, 30.40.
・・Parent circuit diagram, 31.41・Macro, 32.42・
...Sub circuit diagram.

Claims (1)

[Scope of Claims] 1. A circuit element connection search method comprising a circuit element connection search mechanism that detects connections between the layers of a hierarchically designed logic circuit diagram and displays them on an output device. 2. The circuit element connection search mechanism includes a connection search unit that automatically searches for connections between layers of logic circuits, and emphasizes the connection by changing the color of the internal circuit terminals and signal lines of the connected layers. 2. The circuit element connection search method according to claim 1, further comprising a circuit diagram display section to be displayed on the output device.