JPH05290119A - Function and logic simulator - Google Patents

Abstract

PURPOSE:To provide the function and logic simulator which is variable in simulation speed so that a state at each time displayed during the simulation can visually be confirmed. CONSTITUTION:A simulation time update control part 13 delays the update of time by a delay time found by a delay time calculation part 12 when the simulation time is updated so that the simulation is performed at a speed set by a simulation speed setting part 11.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to functional and logic simulators.

[0002]

2. Description of the Related Art As a conventional logic simulator, for example, there is one described in Chapter 4 of "Iwanami Course Microelectronics 4VLSI Design II" issued by Iwanami Shoten on May 10, 1985. The configuration diagram thereof is as shown in FIG. In the conventional simulator, the simulation time is immediately updated in the simulation time updating unit after the simulation executing unit simulates the simulation at a certain time. Further, the current state and result of the simulation are displayed by the current state display means from the simulation executing section, and the changing speed of the display of the current state depends only on the simulation speed of the simulator, that is, the processing speed of the simulation executing section. .. In the conventional simulator, by changing the simulation accuracy, or by changing the condition to display the internal state,
It was possible to change the speed of the simulator, but under the same accuracy and under the same conditions, the simulation speed was constant and there was nothing that could be changed.

[0003]

Displaying the current state during the execution of the simulation makes it possible to detect an abnormality during the execution of the simulation. Therefore, when there is an abnormality, it is not necessary to perform the simulation to the end, and the system verification and This is a very effective method for carrying out the correction process in a short time. However, due to the increase in simulation speed in recent years, it has become difficult to visually confirm the changing state on the display screen depending on the system to be simulated. However, in the conventional simulator, since the simulation speed is constant, if the current state cannot be confirmed on the way, it is necessary to confirm the entire simulation result after executing the simulation to the end. The degree of change in the state during execution of the simulation differs depending on the system to be simulated, but in the conventional simulator, it was impossible to change the simulation speed depending on the simulation target.

Therefore, according to the present invention, the simulation speed is changed depending on the system to be simulated so that the state change during the simulation can always be visually confirmed regardless of the system to be simulated. It is an object of the present invention to provide a function and logic simulator capable of performing the above.

[0005]

In order to solve the above problems, the present invention provides a simulation speed setting means, a waiting time calculation means for updating a simulation execution time, a simulation time updating means, and a simulation time updating execution control. Means, a simulation executing means, and a display means for displaying the state and the result at the simulation executing time, and the simulation speed setting means for slowing down the changing speed of the display made by the displaying means for the state and the result at the simulation executing time. According to the processing speed set in step 1, the waiting time calculating means calculates a delay time for delaying the update at the time of updating the simulation time, and the simulation time updating means updates the simulation time, and then the simulation time update execution control means determines the delay time. It is intended to delay the simulation execution only extended time.

Also, a simulation speed setting means,
There is a waiting time calculation means for updating the simulation execution time, a simulation time updating means, a simulation time update execution control means, a simulation executing means, a status and result display means at the simulation execution time, and a simulation speed change designating means. However, in order to slow down the speed of change of the display made by the means for displaying the state and the result at the simulation execution time, the waiting time calculation means updates the simulation time when the simulation time is updated according to the processing speed set by the simulation speed setting means. The delay time to delay
After the simulation time updating means updates the simulation time, the simulation time updating execution control means delays the simulation execution by the delay time, and the waiting time calculating means according to the speed designated by the simulation speed changing means during the simulation execution. The delay time at the time of updating the simulation time is recalculated, and the delay time of the simulation execution in the simulation time update execution control means when the simulation time is updated is changed.

[0007]

According to the present invention, the user sets the simulation speed by the simulation speed setting means, so that the waiting time calculation means at the time of updating the simulation execution time delays the execution of the simulation at the time of updating the simulation time prior to the simulation. The delay time is calculated and transmitted to the simulation time update execution control means. The simulation time is set by the simulation time updating means, and the simulation time is notified to the simulation executing means by the simulation time updating means. At that time, the simulation time updating execution control means changes the simulation time by the delay time. In order to delay the propagation, the simulation run is carried out according to the time set by the user. Since the current state display means changes the display content according to the result of the simulation execution means, as a result, the changing speed of the current state displayed by the current state display means can be set to the speed set by the user.

Further, the simulation speed changing means is used to change the simulation speed during the simulation so that the waiting time calculating means at the time of updating the simulation execution time re-sets the delay time delaying the execution of the simulation at the time of updating the simulation time. Calculate and notify the simulation time update execution control means. As a result, during the simulation execution, the delay time at the time of updating the simulation time is changed, and the simulation execution speed is changed. As a result, the user can change the changing speed of the current state displayed by the current state displaying means during the simulation.

[0009]

【Example】

(Embodiment 1) FIG. 1 is a simulator configuration diagram according to a first embodiment of the present invention.

In the figure, reference numeral 11 denotes a simulation speed setting unit, which sets the simulation speed desired by the user. Reference numeral 12 denotes a delay time calculation unit at the time of updating the simulation execution time, which calculates the delay time until updating to the next simulation time when updating the simulation time. A simulation time updating unit 13 sets the next simulation time after the simulation executing unit finishes the simulation at a certain simulation time. A simulation time update execution control unit 14 delays the transmission of the next simulation time to the simulation execution unit based on the delay value calculated by the waiting time calculation unit at the time update.
Reference numeral 15 denotes a simulation execution unit, which executes the simulation at the simulation time designated by the simulation time update unit. Reference numeral 16 is a current state display section, which receives the result calculated by the simulation execution section,
The result of the simulation at that time is displayed on the screen.

The present invention will be specifically described by taking as an example the case of simulating the system represented by the state transition diagram shown in FIG. In this state transition diagram, S1, S2 and S3 indicate states that the system of this example can take,
A line with an arrow from one state to another state indicates that the state transits from the state where the arrow appears to the state indicated by the arrow. In addition, the fraction written on the side of the arrow line indicates the input for the numerator to cause the state transition, and the output that the denominator has caused the transition. For example, when the system is currently in the S1 state, if 1 is given as an input, 2 is output and transitions to state S2. If 2 is given as an input, 1 is output and state S3 is entered. When 0 is given as an input, 0 is output, indicating that the state remains S1. Now, assuming that this system receives one input at one time and makes one transition, and the simulation execution unit can simulate this one transition in 0.01 seconds, this simulator will perform 100 simulations per second. It is possible to simulate the time.
Further, in order to confirm the change during the simulation, if the simulation time, the input, the output, and the current state are displayed in the current state display section as shown as one display example in FIG. Since it is linked to the change, it also changes 100 times per second. Assuming that the limit of the number of changes that allows humans to visually check the contents is once a second, in order to check the state of this simulation, the change of the display in the current state display section should be less than once a second. Need to be limited to. Therefore, in the simulation speed setting unit of the present invention,
The user sets one time per second before executing the simulation. Then, at the time of starting the simulation, the delay time calculation unit at the time of updating the simulation time calculates the delay time as 0.99 seconds from the capability of the simulation execution unit and the set simulation speed, and notifies the simulation time update execution control unit. As a result, at the time of updating each simulation time during execution of the simulation, after the next simulation time is determined by the simulation time update unit, the simulation time update execution control unit waits for 0.99 seconds, and then the simulation execution unit performs the next simulation. Tell the time and instruct the execution of the simulation. During this time, the current state display section holds the previous state, and as a result, the state display of the current state display section changes once per second.

(Embodiment 2) FIG. 2 is a simulator configuration diagram according to a second embodiment of the present invention.

In FIG. 1, reference numeral 21 is a simulation speed setting unit for setting a simulation speed desired by the user. Reference numeral 22 denotes a delay time calculation unit at the time of updating the simulation execution time, which calculates the delay time until updating at the next simulation time when updating the simulation time. A simulation time updating unit 23 sets the next simulation time after the simulation executing unit finishes the simulation at a certain simulation time. A simulation time update execution control unit 24 delays transmission of the next simulation time to the simulation execution unit based on the delay value previously calculated by the waiting time calculation unit for time update. Two
Reference numeral 5 denotes a simulation execution unit, which executes the simulation at the simulation time designated by the simulation time update unit. 26 is a current state display section, which receives the result calculated by the simulation execution section,
The result of the simulation at that time is displayed on the screen. Reference numeral 27 is a simulation speed changing unit, which gives an instruction to change the simulation speed on the screen or by key input.

The present invention will be described in detail by taking as an example the case of simulating the system represented by the state transition diagram shown in FIG. Assuming that this system receives one input at one time and makes one transition, and the simulation execution unit can simulate this one transition in 0.01 seconds, this simulator will generate 100 simulation time minutes per second. Can be simulated. Further, in order to confirm the change during the simulation, if the simulation time, the input, the output, and the current state are displayed in the current state display section as shown as one display example in FIG. Since it is linked to the change, it also changes 100 times per second. Assuming that the limit of the number of changes that allows humans to visually check the contents is once a second, in order to check the state of this simulation, the change of the display in the current state display section should be less than once a second. Need to be limited to. In addition, it is assumed that the portion that the user needs to visually confirm in performing the simulation is after 500 simulations. At this time, the user first sets the simulation speed to the maximum speed before executing the simulation in the simulation speed setting unit of the present invention. Then, at the time of starting the simulation, the delay time calculation unit at the time of updating the simulation time notifies the simulation time update execution control unit that the delay time at the time of changing the simulation time is 0 second.
As a result, the simulation is executed by the simulation executing unit without delay in the simulation time change execution control unit when each simulation time is updated from the start. When the user confirms that the simulation time is approaching 500 simulation time from the simulation time shown on the current state display section, the simulation time changing section is used to instruct the simulator to reduce the simulation speed to one simulation time per second. To do. According to the instruction, the delay time calculation unit at the time of updating the simulation time calculates the delay time at the time of changing the simulation time as 0.99, and notifies this delay time to the simulation time update execution control unit. As a result, at the time of updating each simulation time during execution of the simulation, after the simulation time updating unit determines the next simulation time, the simulation time updating execution control unit waits for 0.99 seconds, and then the simulation execution unit performs the next simulation. It will tell the time and give instructions to execute the simulation. As a result, the change in the status display of the current status display section is changed once per second.

As an example of the simulation speed changing unit, a method of changing the speed by sliding using a slide type switch as shown in FIG.
As shown in (b), there is a method of using a vehicle transmission such as a transmission to change the operation stepwise.

Although the present embodiment has been described by using the system simulation described by the state transition diagram, the present invention is applied to the function level simulation of the system described in the function description language and the circuit described in the logic circuit. In the logic level simulation, it can be applied to a simulation performed while displaying the state of the signal line.

[0017]

As described above in detail, according to the present invention, the speed of simulation can be set so that the system changing state can be visually confirmed for each circuit to be simulated. It becomes possible to change to speed, and as a result, for all target circuits,
It becomes possible to check the simulation state at each time during execution one by one, and if there is an abnormality in the simulation, it is possible to discover the abnormality in the middle without executing it to the end. The design time can be shortened.

Further, since it is possible to temporarily reduce the simulation speed during the execution of the simulation, it is possible to reduce only the necessary partial time during the simulation, and as a result, it is possible to reduce the speed. As a result, it is possible to suppress the simulation time from increasing, and as a result, even in a simulation that requires a long time, it is possible to obtain the effect of visually confirming the intermediate state. Can be shortened.

[Brief description of drawings]

FIG. 1 is a simulator configuration diagram according to a first embodiment of the present invention.

FIG. 2 is a simulator configuration diagram according to a second embodiment of the present invention.

FIG. 3 is a state transition diagram showing an example for showing the effect of the present invention.

FIG. 4 is a state display diagram showing an example for showing the effect of the present invention.

FIG. 5 is a diagram showing an example of a simulation speed changing unit in the present invention.

FIG. 6 is a configuration diagram showing an example of a conventional system.

[Explanation of symbols]

11,21 Simulation speed setting unit 12,22 Delay time calculation unit for updating simulation time 13,23 Simulation time updating unit 14,24 Simulation time updating control unit 15,25 Simulation executing unit 16,26 Simulation state display unit 27 Simulation speed Change part

Claims (2)

[Claims] 1. A simulation speed setting means, a waiting time calculation means for updating a simulation execution time, a simulation time updating means, a simulation time updating execution control means, a simulation executing means, and a state and a result at a simulation execution time. In order to slow down the changing speed of the display made by the display means for displaying the state and the result at the simulation execution time, the waiting time calculating means calculates the simulation time in accordance with the processing speed set by the simulation speed setting means. A delay time for delaying the update at the time of updating, and the simulation time updating means delays the simulation execution by the delay time after the simulation time updating means updates the simulation time. Functions and logic simulator. 2. A simulation speed setting means, a waiting time calculation means for updating the simulation execution time, a simulation time updating means, a simulation time update execution control means, a simulation executing means, and a state and a result at the simulation execution time. Display means and simulation speed change designating means, in order to slow down the speed of change of the display made by the state and result display means at the simulation execution time, according to the processing speed set by the simulation speed setting means, The waiting time calculation means obtains a delay time for delaying the update at the time of updating the simulation time, and after the simulation time update means updates the simulation time, the simulation time update execution control means makes the spots for the delay time. Delay the execution of the simulation and further recalculate the delay time at the time of updating the simulation time by the waiting time calculating means according to the speed designated by the simulation speed changing means during the simulation, and the simulation when the simulation time is updated. A function and logic simulator characterized by changing a delay time of simulation execution in time update execution control means.