JPH03278271A - Graphic display device - Google Patents

Abstract

PURPOSE:To easily detect a signal whose value is not changed and its cause by discriminating a signal whose value is changed from a signal whose value is not changed as the result of logical simulation based upon a control means and displaying respective signals on a logic graphic with different colors. CONSTITUTION:Circuit diagram information stored in a magnetic disk device 3 is displayed as a logic circuit diagram 4 on a graphic display 2. Simultaneous ly, a logic simulation result stored in the device 3 is processed by a CPU 1 and a signal 5 whose value is not changed is displayed on the diagram 4 together with its logic value with a color different from that of a signal 6 whose value is changed. Instead of the display of the different color, the signal 5 may be displayed with different brightness.

Description

[Detailed Description of the Invention] Field of Industrial Application) This invention displays the results of logic simulation of a circuit on a drawing of a graphic display screen, and identifies the portions where signal values do not change due to defects in test patterns (simulation This invention relates to a drawing display device that facilitates the discovery of unverified portions.

[Conventional technology]

FIG. 6 is a diagram showing a conventional display device, and in the figure (
1) is a central processing unit, (2) is a graphic display for displaying the circuit diagram or the results of logic simulation, and (3) is connected to the central fil! device (1), which displays the circuit diagram and the logic of this circuit diagram. A magnetic disk device for holding logical values that are the results of simulations (
7) is a hard copy device connected to the graphic display (2) for making a copy of the graphic screen; and (8) is a printer device for printing out the logical values.

Next, the operation will be explained. The results of the logical simulation stored in the magnetic disk device (3) are printed at 0°' or 1°'' by the printer device (8), and at the same time, the circuit diagram stored in the magnetic disk device (3) is printed. The information is printed in the form of a circuit diagram by a hardcopy device (7).

[Problem to be solved by the invention]

Conventional screen display devices are configured as described above, so in order to observe a signal that does not change as a result of a logic simulation, first find a signal that does not change from the simulation results, and then convert that signal into a circuit diagram. The problem is that it takes time and effort to find the reason why the signal does not change.

This invention was made to solve the above-mentioned problems, and it is possible to easily identify signals whose values do not change as a result of logic simulation and their causes, without outputting circuit diagrams or logic simulation results. The object is to obtain a drawing display device that can be found.

[Means to solve the problem]

A drawing display device according to the present invention is a drawing display device that displays a logical drawing including circuit elements on a graphic display, and includes a magnetic disk device that stores a simulation result file and a logical drawing file, and a magnetic disk device that stores a simulation result file and a logical drawing file. The system is equipped with a control means that searches for signals whose values have changed and signals whose values have not changed through logic simulation, and displays them on the logic diagram by changing their colors.

[Effect]

The drawing display device according to the present invention has the following features:
As a result of the logic simulation, signals with a change in value and signals with no change are distinguished and displayed in different colors on the logic diagram.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of the drawing display device according to this embodiment. In the figure, (1) is a central processing unit, (2) is a graphic display, and (3) is a magnetic disk device.

Also, Fig. 2 is a flowchart operated by the central processing unit (1), Fig. 3 is a simulation result file storing simulation results, Fig. 4 is a logical drawing file, and Fig. 5 is a graphic display (
2) The logic diagrams displayed above are shown respectively, and in Figure 5,
(4) is a logic circuit diagram, and (5) and (6) are signals that did not change and signals that changed as a result of logic simulation.

Next, the operation related to the configuration shown in FIG. 1 will be explained with reference to the flowchart shown in FIG. 2 and FIGS. 3 to 5. In addition, in Fig. 3, SIG A, SIG BSIG C are signal names, and 10010, 1.0 are SIG at time 100.
It shows that IGA is 0, SIG B is 1, and SIG C is 0. Further, U indicates that the logical value is an undefined value.

The central processing unit (1) stores the logical simulation result file stored in the magnetic disk device (3) (see Figure 83).
is read out, and a signal with no change in value is distinguished from a signal with a change in value (step 521 in FIG. 2).

Next, step S in Figure 2 reads the logical drawing file (see Figure 4) stored in the magnetic disk device (3).
22) Find the extracted signal on the corresponding logic circuit diagram shown in FIG. 5 based on the signal name and element name, and display the corresponding signal and element in different colors on the logic diagram (Second
Figure step 523S24). That is, for example, a signal whose logical value is 1 (a signal with no change) can be obtained by searching the signal name from the simulation result file in Figure 3, and the tri-state buffer is
First, search for the logical drawing file from Figure 4, and
Find a type F element, then connect the pin O of that element.
Find C (for example, OC for output control) and obtain the polarity of that signal (negative polarity if \B, positive polarity if not) and the name of the signal connected to it (Steps in Figure 2) 522). Then, the logical value of this signal is obtained from the simulation result file shown in Figure 3, and if the polarity of the bin is positive, the logical value of the signal is 1, and if it is negative, it is 0, which is the case where the signal is enabled. Change the color of the elements in the logical drawing file accordingly (Step 5 in Figure 2)
23).

The logic diagram displayed in this manner is shown in FIG. 5, in which the parts indicated by thick lines are the parts displayed in different colors.

As mentioned above, the circuit diagram information stored in the magnetic disk drive (3) is displayed as a logic circuit diagram (4) on the graphic display (2).

At the same time, the results of the logic simulation stored in the magnetic disk drive (3) are processed by the central processing unit (1), and the signal (5) that has not changed is different from the signal (6) that has changed along with its logical value. Logic circuit diagram in different colors (4)
displayed above.

As a result of the logic simulation, as a result of the logic simulation, the signals that did not change are displayed in a different color from the signals that changed along with their logical values, so it is easy to identify the parts that did not change and their causes. In the example in Figure 5, siga is 1
``If you give someone a cover turn, you can easily find something good.

In the above embodiment, the signals are classified into signals that have changed and signals that have not changed, but they may be classified into signals that have changed n or more times and signals that have changed less than 9 times.

Further, instead of displaying by changing colors, display may be performed by changing brightness.

〔Effect of the invention〕

As described above, according to the present invention, signals that did not change as a result of logic simulation are directly displayed on the drawing on the graphic display screen together with their logical values. The cause can be easily discovered.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a drawing display device according to an embodiment of the present invention, FIG. 2 is an operational flowchart of a central processing unit (1), and FIGS. 3 and 4 are a diagram showing a magnetic disk device (3). ) is an explanatory diagram of the simulation result file and logical drawing file stored in the graphic display (2).
), and FIG. 6 is a configuration diagram showing a conventional drawing display device. (1) is the central processing unit, (2) is the graphic display, (3) is the magnetic disk device, (4) is the logic circuit diagram, (5) is the signal that did not change, and (6) was the signal that changed. It is. Note that the same reference numerals in the figures indicate the same or corresponding parts. Procedural amendment (voluntary) May 21, 1990 1. Indication of the case Patent Application No. 2-79386 2. Title of the invention Drawing display device 3. Person making the amendment Relationship to the case Patent applicant address Tokyo 2-2-3 Marunouchi, Chiyoda-ku
Name (601) Mitsubishi Electric Co., Ltd. Representative: Moriya Shiki 4, Agent address: 4th floor, Nakayama Building, 1-9-13 Hikibashihonmachi, Chuo-ku, Tokyo The column for detailed explanation of the invention in the specification, and drawings. 6. Contents of amendment (1) “Obtained,
Also... (Step 523 in Figure 2). '' should be amended as follows. "Obtained (Step 522 in Figure 2). Then, change the color of the signal in the logical drawing file in Figure 4 (Step 523 in Figure 2)." (2) Correct the drawing Middle East Figure 5 as shown in the attached sheet. 7. At least one catalog drawing of attached documents

Claims (1)

[Claims] In a drawing display device that displays logical drawings including circuit elements on a graphic display, there is a magnetic disk device that stores simulation result files and logical drawing files, and values that have changed due to logical simulation from the simulation result files and logical drawing files. A drawing display device characterized by comprising a control means for searching for signals and signals that have not changed, and controlling display on a logic drawing by changing colors.