JP3230474B2 - Waveform display device with clock cycle display function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of analyzing a waveform synchronized with a clock cycle displayed on a waveform display device by displaying a mark on the waveform display device by designating a clock. The present invention relates to a waveform display device with a clock cycle display function, which facilitates analysis and saves analysis time.

[0002]

2. Description of the Related Art In a conventional waveform display apparatus, when performing a waveform analysis synchronized with a clock cycle, it is necessary to consider a difference between respective times when analyzing a relationship between waveform state values, which takes time. FIG. 8 shows a conventional waveform display device.
This shows a state where the clock and the signals 1 and 2 are displayed. Signal 1 has a state value changing from 0 to 1 at time 10, and signal 2 has a state value changing from 0 to 1 at time 50. That is, signal 2 is 2
It changes after the cycle clock.

When analyzing such a change in the waveform, the number of clocks is measured while comparing the waveform with the clock waveform, and it is determined that the signal 2 changes two clock cycles after the signal 1.

[0004]

In the conventional waveform display device, only the clock and signal waveforms are displayed only. Therefore, the correspondence between a plurality of signals is analyzed in synchronization with the clock cycle. In this case, the time difference must be considered, so that the cycle cannot be read immediately, and there is a problem that it takes time for analysis.

[0005] An object of the present invention is to solve such a problem, and when performing a waveform analysis synchronized with a clock cycle, a waveform is easily analyzed by displaying a mark on a waveform display device by designating a clock. Another object of the present invention is to provide a waveform display device with a clock cycle display function, which does not require an analysis time.

[0006]

According to the present invention, there is provided a waveform display apparatus having a clock cycle display function, comprising: a waveform name representing a name of a waveform for displaying a clock cycle; an event representing a state change for displaying a clock cycle; Clock information storage means for storing clock information including: a waveform display information storage means for storing waveform display information; a waveform name and an event, which are clock information stored in the clock information storage means; Cycle display information generating means for extracting the clock display time and generating cycle display information based on the waveform display information stored in the means, and storing the cycle display information generated by the cycle display information generating means. Cycle display information storage means; and cycle display information stored in the cycle display information storage means. A waveform display device having a clock / cycle display function, comprising: a waveform display unit for displaying a waveform based on the waveform display information stored in the waveform display information storage unit; New cycle display information is created from display information, an initial event, and the number of cycles, and a waveform is displayed based on the new cycle display information and the waveform display information.

[0007]

FIG. 1 shows a configuration diagram of a waveform control apparatus according to an embodiment of the present invention. This waveform display device includes a clock information storage unit 1 for storing clock information for displaying a clock cycle, a waveform display information storage unit 2 for storing waveform display information, and a clock information storage unit 1.
Cycle display information generating means 3 for generating cycle display information based on the clock information stored in the memory and the waveform display information stored in the waveform display information storage means 2, and the cycle display information generated by the cycle display information generating means 3 A cycle display information storage means 4 for storing, and a waveform display means 5 for displaying a waveform based on the cycle display information stored in the cycle display information storage means 4 and the waveform display information stored in the waveform display information storage means 2 Have been.

Next, the operation of this embodiment will be described.

The clock information storage means 1 stores clock information for displaying a clock cycle. FIG. 2 shows clock information stored in the clock information storage unit 1. The waveform name indicates the name of the waveform for which the clock cycle is displayed, and the event indicates the state change for which the clock cycle is displayed. In the example of FIG. 2, the waveform name is “clock” and the event is “rising”.

The waveform display information storage means 2 stores waveform display information. FIG. 3 shows the waveform display information stored in the waveform display information storage means 2. Each table shows the state value of each waveform "clock", "signal 1", and "signal 2" with respect to time.

[0011] The clock is generated at times 0, 10, 20, 30,.
Is a waveform in which the state value alternates between 0 and 1.
Signal 1 is a waveform whose state value changes from 0 to 1 at time 10. Signal 2 is a waveform whose state value changes from 0 to 1 at time 50.

The cycle display information generating means 3 generates cycle display information from the clock information stored in the clock information storage means 1 and the waveform display information stored in the waveform display information storage means 2. FIG. 4 shows the cycle display information stored in the cycle display information storage means 4. In the examples of FIGS. 2 and 3, the waveform name is “clock” and the event is “rising”.
0, 30, and 50 are extracted to generate cycle display information. In other words, the cycle display information includes the time 10,
A mark is displayed at 30, 50.

The cycle display information storage means 4 stores the cycle display information generated by the cycle display information generation means 3.

The waveform display means 5 displays a waveform based on the cycle display information stored in the cycle display information storage means 4 and the waveform display information stored in the waveform display information storage means 2. FIG. 5 shows a waveform display displayed by the waveform display means 5. The thin line indicates the state value 0 or 1 at time 0, 10, 20, 30, 40, 50, 60,... Of each of the signals “clock”, “signal 1”, “signal 2” displayed from the waveform display information. A vertical broken line is a mark indicating a clock cycle displayed from the cycle display information. That is, these marks are indicated by broken lines 11 representing the rising timing of the clock and signal 1 at time 10.
And a dashed line 12 representing the next rising timing of the clock at time 30, and a dashed line 13 representing the rising timing of the clock and signal 2 at time 50.

Here, if there is a characteristic that the state value of signal 2 changes from 0 to 1 two cycles after the clock when the state value of signal 1 changes from 0 to 1, if the clock cycle display information has It can easily be seen from the broken line that there is a change after two cycles.

Next, another embodiment of the present invention will be described. By giving an initial event and the number of cycles to the cycle display information stored in the cycle display information storage means 4, waveform analysis is further facilitated.

For example, when the initial event is set to 1 and the number of cycles is set to 2 for the cycle display information shown in FIG. 4, the cycle display information becomes as shown in FIG. 6, and the waveform display becomes as shown in FIG. It becomes more apparent that the state value of signal 1 changes from 0 to 1 and the state value of signal 2 changes from 0 to 1 two cycles later.

[0018]

According to the present invention, when performing a waveform analysis synchronized with a clock cycle, a mark is displayed on a waveform display device by designating a clock, thereby facilitating the waveform analysis, thereby reducing the analysis time. There is.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration diagram of a waveform device according to an embodiment of the present invention.

FIG. 2 is a diagram showing clock information stored in clock information storage means.

FIG. 3 is a diagram showing waveform display information stored in a waveform display information storage means.

FIG. 4 is a view showing cycle display information stored in a cycle display information storage means 4;

FIG. 5 is a diagram showing a waveform display displayed by a waveform display means.

FIG. 6 is a diagram showing cycle display information in another embodiment.

FIG. 7 is a diagram showing a waveform display in another embodiment of FIG. 6;

FIG. 8 is a diagram showing a waveform display in a conventional waveform display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clock information storage means 2 Waveform display information storage means 3 Cycle display information generation means 4 Cycle display information storage means 5 Waveform display means 11, 12, 13 Mark

Claims (1)

(57) [Claims] 1. Clock information storage means for storing clock information including a waveform name representing a name of a waveform for performing clock cycle display and an event representing a state change for performing clock cycle display, and storing waveform display information. A waveform display information storage unit, a waveform name and an event that are clock information stored in the clock information storage unit, and a time at which the clock cycle display is performed based on the waveform display information stored in the waveform display information storage unit. Cycle display information generating means for extracting the cycle display information to generate cycle display information, cycle display information storing means for storing the cycle display information generated by the cycle display information generating means, and the cycle stored in the cycle display information storing means. Waveform display based on display information and waveform display information stored in the waveform display information storage means A waveform display device having a clock cycle display function, comprising: a cycle display information stored in the cycle display information storage means, an initial event, and a cycle number. Wherein a waveform is displayed based on new cycle display information and the waveform display information.