JPH0272437A - Simulation system for logic circuit - Google Patents

Abstract

PURPOSE:To shorten the overall simulation processing time of a logic circuit by setting the described logic circuits at the input and output sides of a packed logic circuit respectively. CONSTITUTION:The described logic circuits 1 and 3 are produced by a general- purpose computer 5 with description and in terms of software. The computer 5 performs the simulation of the circuit 1, and the obtained data information is stored in an input memory 8. Then a controller 7 applies an input signal to a packed logic circuit 2 via a register 9 to start the circuit 2 and fetches the change of the output signal of the circuit 2 to a register 10. At the same time, the data information on the output signal is stored in an output memory 11 together with the time changed between the start and the next start. Then the computer 5 uses the stored data to carry out the simulation of the circuit 3. In such a way, the simulation processing time can be shortened for the logic circuit.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a simulation method for logic circuits, and more particularly to a simulation method for logic circuits consisting of an integrated logic circuit and a description logic circuit written in software by a general-purpose computer or the like. It is related to.

Prior Art In the conventional simulation method for this type of logic circuit,
Generally, as shown in FIG. 3, a logic circuit 30 written in software using a general-purpose computer or the like and an existing logic circuit 31 implemented as an integrated circuit are simultaneously simulated.

In the conventional logic circuit simulation method described above,
After operating the implemented logic circuit for each piece of data information, the output result data information that appears in the implemented logic circuit is used to simulate the logic circuit written in software by a general-purpose computer. It takes a long time to simulate test data for a logic circuit written in software, and the frequency cannot be kept within the specified range, which is essential for the implemented logic circuit, which requires consideration of timing, to ensure normal operation. Things become difficult.

Therefore, it is necessary to use a method in which the entire process is memorized every time the input data information is advanced, and the simulation is always repeated from the beginning to obtain a single result. The simulation processing time using such a method is proportional to the factorial of the time required for simulation for each piece of data information, so it has the drawback of being inefficient and requiring a huge amount of time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a logic circuit simulation method that can significantly shorten simulation processing time.

According to the present invention, there is provided a simulation method for a logic circuit consisting of an integrated logic circuit and a description logic circuit written in software, wherein the input/output side of the integrated logic circuit is The description logic circuit is divided and connected to each other, the description logic circuit on the input side of the implementation logic circuit is simulated, the resulting data is stored in a memory, and the implementation logic circuit is connected from this stored data. Set input data to and supply it to this mounted logic circuit, store the output result data in a memory, and use this stored data to simulate the description logic circuit on the output side of the mounted logic circuit. A logic circuit simulation method is obtained which is characterized by the following.

X1 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention. In FIG. 1, a mounted logic circuit 2 is an actual IC-based logic circuit to be simulated. Logic circuit 1 and logic circuit 3 shown in FIG. 2, excluding circuit 2, are described logic circuits written and formed using software by a general-purpose computer 5.

The control device 7 is controlled by the general-purpose computer 5, stores data information from the data storage device 6 to be input to the mounted logic circuit 2 in the input memory 8, sequentially applies real-time input signals from the register 9, and inputs the mounted logic circuit 2. This is to start circuit 2. In addition, the control device 7 senses a change in the output signal of the mounted logic circuit 2 and inputs it into the register 10, and also stores the data information of the output signal in the output memory 11 along with the time of change from the above-mentioned activation to the next activation. The data is stored in the data storage device 6 of the general-purpose computer 5 via the control device 7 and stored therein.

The input/output device 4 includes a general-purpose computer 5 and a data storage device 6.
It performs control operations such as simulation, and also displays the simulation execution status and error detection.

The simulation operation of the logic circuit to be simulated shown in FIG. 2 using the system shown in FIG. 1 will be explained. The logic circuit to be simulated is assumed to have a structure in which description logic circuits 1 and 3 are divided and connected to the input and output sides of the implemented logic circuit 2, respectively, as shown in FIG.

A general-purpose computer 5 performs a simulation of the description logic circuit 1 shown in FIG. When the simulation of the description logic circuit 1 is completed, the input data information of all the mounted circuits 9 stored in the data storage device 6 is sequentially sent from the general-purpose computer 5 to the input memory 8 via the control device 7.

When the sequential output to the input memory 8 is completed, the control device r11
7 sequentially sets a real-time input signal from the input memory 8 to the register 9 for normal operation of the mounted logic circuit 2, supplies it to the mounted logic circuit 2 to start it, and outputs the started mounted logic circuit 2. detects a change in the output signal appearing in the controller 7 and captures it in the register 10, and at the same time stores the data information of the output signal in the output memory 11 together with the change time from the start to the next start, The data is transferred to and stored in the data storage device 6 of the general-purpose computer 5 via the control device 7.

When the data information of the output signal result of the mounted logic circuit 2 described above is completely stored in the data storage device 6,
A simulation of the description logic circuit 3 shown in FIG. 2 is performed from the data information in the data storage device 6.

In the above operating procedure, the description logic port 118 in FIG.
1, an implementation logic circuit 2, and a description logic circuit 3, but it is clear that a configuration in which it is desired to have a description logic circuit 1 or a description logic circuit 3 can be easily realized. .

Effects of the Invention According to the present invention, the circuit to be simulated is configured to be independently divided into an implementation logic circuit and a description logic circuit, and the description logic circuits are arranged on the input and output sides of the implementation logic circuit. This has the effect of greatly reducing the simulation processing time required for the entire logic circuit.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram of an embodiment of the present invention, FIG. 2 is a configuration diagram of a logic circuit to be simulated, and FIG. 3 is a configuration diagram of a conventional logic circuit to be simulated. Explanation of symbols of main parts 1.3...Description logic circuit 2...Implementation logic circuit

Claims (1)

[Claims] (1) A simulation method for a logic circuit consisting of an integrated logic circuit and a description logic circuit described in software, wherein the description logic circuit is divided into input and output sides of the implementation logic circuit. A description logic circuit on the input side of the mounted logic circuit is simulated, the resulting data is stored in a memory, and input data to the mounted logic circuit is set from this stored data. A logic circuit characterized in that the data is supplied to the mounted logic circuit, the output result data is stored in a memory, and the stored data is used to simulate a descriptive logic circuit on the output side of the mounted logic circuit. Simulation method.