JPH03196269A - Graphic display device - Google Patents

Abstract

PURPOSE:To easily detect a logic error by displaying a signal having the undefined value and an enabled tristate buffer on a logic graphic in different colors. CONSTITUTION:A signal having the undefined value is obtained when a signal name having the U (undefined) logic value is retrieved out of a simulation result file. At the same time, an element having a TSBUF type is obtained with retrieval of a logic drawing file. Then a pin OC of the element is detected and the polarity (negative with inclusion of /B and positive with no inclusion of /B) of a relevant signal is obtained together with a signal name to be connected to the signal. Then the logic value of the signal is obtained out of the simulation result file, and an enable state is secured with the signal logic value set at 1 with the positive polarity of the pin and with the logic value set at 0 with the negative polarity respectively. Under such conditions, the colors of elements are changed in the logic drawing file. Thus it is possible to easily detect an undefined signal and an enabled element.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention relates to a drawing display device for displaying the results of logical simulation on a drawing on a graphic display screen.

(Prior Art) FIG. 6 is a diagram showing a conventional display device, and in the figure (
1) is a central processing unit, (2) is a magnetic disk device that stores a logic diagram and the results of logic verification performed on the circuit on the logic diagram, (3) is a graphic display, (7)
) is a hard copy device that prints the screen on the graphic display (3).

Next, the operation will be explained. The logic diagram stored in the magnetic disk (2) and the logic simulation results performed on the circuit on the logic diagram are displayed separately on the graphic display (3) via the central processing unit (1),
The screen displayed on the graphic display (3) is then printed out by a hard copy device (7).

[Problem to be solved by the invention]

Since conventional screen display devices are configured as described above, as a result of logic simulation, if there are multiple tri-state buffers outputting to the same tri-state bus due to a logic error, the multiple tri-state If the buffers are enabled at the same time and the signal value of the tristate bus is undefined, the signal value of the simulation result printed by the hard copy device (7) and the signal value on the graphic display (3) It took time to compare the logic diagrams and find out which tri-state buffers were enabled at the same time.

This invention was made in order to solve the above-mentioned problems, and it is possible to easily find undefined signals and enabled elements as a result of logic simulation on a logic diagram on a display. The object of the present invention is to obtain a drawing display device that can perform the following functions.

[Means to solve the problem]

A drawing display device according to the present invention is a drawing display device that displays a logical drawing on a graphic display, and includes a magnetic disk device that stores a simulation result file and a logical drawing file, and a logical simulation from the simulation result file and logical drawing file. As a result, the apparatus is equipped with a control means that searches for signals whose values are undefined and elements that are enabled, and controls the display of the elements on the logic diagram by changing the color of the elements.

[Effect]

The drawing display device according to the present invention has the following features:
Extract signals with undefined values and elements whose output control is enabled from the logic simulation result file, correlate them with the signals and elements in the logic drawing file, and display the corresponding signals and elements on the logic diagram. Display in different colors.

〔Example〕

An embodiment of the present invention will be described below 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 magnetic disk device, and (3) is a graphic display.

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 screen file, and Fig. 5 is a graphic display (
3) The logic diagrams displayed above are shown respectively, and in Figure 5,
(4) is a tri-state buffer that is enabled, (5) is a tri-state buffer that is disabled, and (6) is a signal whose value is undefined.

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.

The central processing unit (1) stores the logical simulation result file (see Figure 3) stored in the magnetic disk device (2).
is read, and signals whose values are undefined and tri-state buffers whose output control is enabled are extracted (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 (2).
22) Find the extracted signal and element on the corresponding logic 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 (
Step S23゜524 in Fig. 2). In other words, signals with undefined values can be obtained by searching the simulation result file in Figure 3 for signal names whose logical value is IJ (Undefined), and whose output control is enabled. The tri-state buffer first searches for the logical drawing file from Figure 4 and saves it to TSBUF.
Find the type of device, then select the pin OC of that device.
(The output control bin name is fixed, for example, OC.) Find the polarity of that signal (negative polarity if \B, positive polarity if not) and connect it to it (obtain the name 8 (see Figure 2). Step 523).Then, the logic value of this signal is obtained from the simulation result file of Figure 3, and if the polarity of the bin is positive, the logic value of the signal is 1, and if the polarity of the bin is negative, it is 0. Therefore, if enabled, the color of the element in the logical drawing file is changed (step 524 in FIG. 2).

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.

Note that in the above embodiment, signals with undefined values and enabled tri-state buffers are displayed in different colors, but they may be displayed in different brightness, and the same effect as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, signals with undefined values and enabled tri-state buffers are displayed in different colors on the logic diagram, so that the causes of undefined values of signals can be eliminated. It is easy to discover errors in logic.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a drawing display device according to an embodiment of the present invention, FIG. 2 is an operation flowchart of the central processing unit (1), and FIGS. An explanatory diagram of the simulation result file and logical drawing file, Figure 5 is the graphic display (3)
FIG. 6 is a configuration diagram showing a conventional drawing display device. (1) is a central processing unit, (2) is a magnetic disk device, (
3) is the graphics display, (4) is the tri-state buffer enabled, (5) is the tri-state buffer disabled, and (6) is the tri-state buffer disabled.
is a signal whose value is undefined. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In a drawing display device that displays logical drawings on a graphic display, there is a magnetic disk device that stores a simulation result file and a logical drawing file, and a value that is undefined as a result of logical simulation from the simulation result file and logical drawing file. A drawing display device characterized by comprising a control means for searching for a signal and an enabled element, and changing the color of the element to control display on a logic drawing.