JPH05225286A - Circuit element connection search method - Google Patents

Abstract

(57) [Summary] [Structure] The connection path extraction unit 5 designates the input pin and the output pin of the circuit element on the logic circuit diagram (step 1),
Backward tracing is performed from this input pin to the output pin of the previous stage (step 2). Check if the output pin specified in step 1 has been reached (step 3),
If not reached (NO), the process proceeds to step 4 and the backward trace is continued. When the output pin designated in step 3 is reached (YES), the process proceeds to step 5 and the connection path (path) between the input pin and the output pin is extracted. Next, the circuit diagram display unit 6 graphically emphasizes the circuit elements and signal lines on the extracted path by changing the colors of the other portions (step 6). [Effect] The number of circuit diagram analysis steps can be significantly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit element connection search system for a circuit diagram input system.

[0002]

2. Description of the Related Art Conventionally, a connection path between elements in a logic circuit diagram of this type has been searched by coloring the connection path on the circuit diagram with a colored pencil and tracing the connection path manually.

[0003]

In the above-described conventional circuit element connection path search method, the connection paths are manually traced, so that the number of circuit drawings becomes enormous and the connection paths also become enormous in a large-scale circuit. Therefore, there is a drawback that the number of analysis steps of the circuit diagram is increased and it becomes impossible to manually trace the connection route.

[0004]

According to the circuit element connection search method of the present invention, a connection path extracting means for extracting a connection path between circuit elements of a logic circuit diagram and a graphic display of the extracted connection paths and circuit elements. Circuit diagram display means.

The graphic display may emphasize the extracted connection paths and circuits with a color different from that of the non-extracted portion. Further, the connection path extracting means may be one that performs backward tracing from the end point to the start point of the connection path to extract.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a circuit element connection search method of the present invention, FIG. 2 is a flow chart for explaining the operation of the present embodiment, and FIG. 3 is a view showing an example of backward trace in this embodiment. FIG. 4 is a diagram showing an example of a graphic display in this embodiment.

In FIG. 1, by analyzing an input signal from the input / output device 1, the arithmetic processing device 2 instructs the data storage device 3 to store data and instructs the circuit element connection search means 4 to search for a circuit element connection path. I do. The circuit element connection route search means 4 includes a connection route extraction unit 5 and a circuit diagram display unit 6, and the connection route extraction unit 5 and the circuit diagram display unit 6 are realized by hardware or software.

Next, the operation of this embodiment will be described.
The connection path extracting unit 5 designates the input pin and the output pin of the circuit element as shown in FIG. 3 on the logic circuit diagram (step 1), and performs backward tracing from this input to the output pin of the previous stage (step 1). 2). It is checked whether the output pin instructed in step 1 has been reached (step 3). If not reached (NO), the process proceeds to step 4 to continue backward tracing. If the output pin designated in step 3 is reached (YES), step 5
Proceed to and extract the connection path (path) between the input pin and the output pin. Next, the circuit diagram display unit 6 changes the color of the circuit elements and signal lines on the extracted path as shown in FIG.

The graphical highlighting may be performed by changing the gray scale of image gradation or blinking.

[0010]

As described above, according to the present invention, the connection paths between the circuit elements are automatically extracted and the circuit elements and the signal lines of the connection paths are highlighted. This has the effect of significantly reducing the number of circuit diagram analysis steps compared to the conventional method of tracing the connection.

[Brief description of drawings]

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

FIG. 2 is a flowchart for explaining the operation of this embodiment.

FIG. 3 is a diagram showing an example of a backward trace in this embodiment.

FIG. 4 is a diagram showing an example of a graphic display according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input / output device 2 Arithmetic processing device 3 Data storage device 4 Circuit element connection search means 5 Connection path extraction part 6 Circuit diagram display part

Claims (3)

[Claims] 1. A circuit comprising: a connection path extracting means for extracting a connection path between circuit elements of a logic circuit diagram; and a circuit diagram display means for graphically displaying the extracted connection paths and circuit elements. Device connection search method. 2. The circuit element connection search method according to claim 1, wherein the graphic display highlights the extracted connection paths and circuits with a color different from that of the non-extracted portion. 3. The circuit element connection search method according to claim 1, wherein said connection path extracting means performs backward trace extraction from the end point to the start point of said connection path.