JPH03100867A - Display system for result of logical simulation - Google Patents

Abstract

PURPOSE:To easily confirm the logical simulation result by displaying a logic circuit diagram of a display subject signal on a signal waveform. CONSTITUTION:A result data storage part 2 stores the signal value, etc., of the logical simulation result, a logic circuit data storage part 3 stores the data necessary for display of a logic circuit diagram. A signal waveform production part 4 produces a signal waveform based on the logical simulation result data. A logic circuit diagram production part 5 produces a logic circuit diagram based on the logic circuit data and displays this circuit diagram together with a signal waveform produced by a signal waveform/logic circuit diagram display part 6. The logic circuit diagram is displayed on the signal waveform. Therefore the different display colors are used to the circuit diagram and the signal waveform for easier identification of them. Furthermore the logic circuit diagram is displayed as a background of the signal waveform and the display contents are coincident with each other between them. Thus it is possible to easily refer to the logic circuit diagram for confirmation of the action of the signal waveform.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for displaying signal waveforms on a display device in order to confirm the output results of a logic simulator used for verifying the design of logic circuits such as LSIs. , relates to a display method for logic circuit diagrams.

[Prior Art] Conventionally, in order to check the output results of a logic simulator used for verifying logic circuit designs, signal waveforms are drawn and displayed on a graphic terminal, etc., but it is often the case that the signals displayed are the logic circuits. In order to confirm which part of the signal waveform, a logic circuit diagram was displayed adjacent to the signal waveform, that is, above or below the signal waveform.

[Problems to be Solved by the Invention] The above-mentioned conventional technology has the problem that the displayable range becomes narrow because the signal waveform and the logic circuit diagram are displayed at different positions on the narrow screen of the graphic terminal.

An object of the present invention is to display signal waveforms and logic circuit diagrams in an overlapping manner at the same location in order to expand the displayable range.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a logic design support apparatus having a display device that displays logic simulation results as a signal waveform, in which the result is superimposed on the signal waveform, that is, the signal waveform is displayed. A logic circuit diagram in which one display target signal exists is displayed as a background screen.

[Function] In the present invention, in order to display the signal waveform and the logic circuit diagram in an overlapping manner, the two are displayed in different colors to facilitate identification. In addition, the logical port N1 diagram is displayed as a background of the signal waveform, and the displayed content of 1 is made to match the content of the signal waveform. This makes it easy to refer to a logic circuit diagram for checking the operation of signal waveforms.

[Example] An example of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. This embodiment is an embodiment in a workstation 1,
Reference numeral 2 denotes a result data storage section, which stores signal values and the like of logic simulation results. A logic circuit data storage section 3 stores data necessary for displaying a logic circuit diagram. 4 is a signal waveform creation unit that creates a signal waveform from logic simulation result data.

5 is a logic circuit diagram creating section, which creates a logic circuit diagram from logic circuit data. Reference numeral 6 denotes a signal waveform/logic circuit diagram display section, which graphically displays the created signal waveform and logic circuit diagram.

Keyboard 7 and mouse 8.

FIG. 2, which provides instructions on how to display signal waveforms and logic circuit diagrams, is a processing flow of a display operation in the embodiment. Step 20 is a process of creating a signal waveform, step 21 is a process of searching for which part of the logic circuit is the signal whose signal waveform is displayed, and step 22 is a process of creating a logic circuit diagram of the found logic circuit part. Step 23 is a process to do this.

This is the process of displaying the created logic circuit diagram, and step 2
4 is a process of superimposing and displaying the signal waveform created in 1 on the logic circuit diagram. FIG. 3 is an example in which a signal waveform and a logic circuit diagram are superimposed and drawn and displayed on a display device, where 30 is a signal waveform and 31 is a logic circuit diagram. Note that if it is not necessary to refer to the logic circuit diagram, it can be deleted.

[Effects of the Invention] According to the present invention, it is possible to display a logic circuit diagram superimposed on the signal waveform display of logic simulation results, making it possible to display twice as much as when displaying them separately, making it easier to check the results. Work becomes easier.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a processing flow diagram of this embodiment, and FIG. 3 is a diagram of signal waveforms and logic circuits displayed by this embodiment. Explanation of symbols 1...Workstation, 2...Result data storage unit, 3...Logic circuit data storage unit, 4...Signal waveform creation unit, 5...Logic circuit diagram creation unit, 6. ... Signal waveform/logic circuit diagram display section, 7... Keyboard, 8... Mouse. Tsuta 1 [21 20th

Claims (1)

[Claims] 1. In a logic design support device having a display device that displays signal waveforms based on simulation result data output from a logic simulator, a logic circuit diagram of the signal to be displayed is displayed superimposed on the signal waveform. A logical simulation result display method.