JPH08235075A - Arithmetic processor - Google Patents

Abstract

PURPOSE: To prevent arithmetic processing from being futilely stopped and to restore a storage device by copying the contents of the storage means on the side decided as a normality to the storage means on the side decided as an abnormality when the abnormality occurs. CONSTITUTION: An arithmetic means 1 executes an arithmetic processing in accordance with the program 4 stored in a program means 2, referring to the data stored in a storage means 3a or 3b as necessary. The storage means 3a and 3b store data and the values of the results that the contents is decided and calculated are stored as check data in the parts of the storage means 3a and 3b. A decision means 4 performs a decision calculation for the contents of the data stored in the storage means 3a and 3b as occasion demands while the arithmetic means 1 executes the arithmetic processing and decides whether abnormalities occur in the data of the storage means 3a and 3b or not by the value of the result and the value of the check data. A copying means 5 copies the contents of the storage means on the side which is not decided as an abnormality to the storage means on the side decided as an abnormality and the restorations of the storage means 3a and 3b are performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arithmetic means for executing arithmetic processing, a program means for storing a program for arithmetic processing, a storage means for storing data including constants necessary for arithmetic processing, and an abnormality of the storage means. The present invention relates to an arithmetic processing unit which is composed of a judging unit for making a judgment and a copying unit, and particularly has a function of recovering from an abnormality in a storage unit.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional arithmetic processing apparatus, 1 is arithmetic means for executing arithmetic processing, 2 is program means for storing a program for arithmetic processing, 3 is data including constants (hereinafter simply referred to as data), etc. Is a storage means for storing. Normally, in the arithmetic processing device having such a configuration, if the data in the storage means 3 changes due to some abnormality, normal arithmetic processing may not be performed in some cases.

For this reason, the check data as a judgment value for detecting whether an abnormality has occurred in advance in the data is regarded as the numerical data of the storage means 3, and all the values are used to determine whether there is a change in contents. A mathematical expression for determination is obtained by calculation (hereinafter, simply referred to as determination calculation), and the determination value is stored in a part of the storage means 3, and the calculation means 1 executes the calculation processing to the data in the storage means 3 at any time. Then, the presence / absence of an abnormality in the storage means 3 is determined from the result and the determination value. If it is determined that there is no abnormality, the arithmetic processing is continued, and if the abnormality occurs, the arithmetic processing is stopped. Was there.

The following is generally well known as a practical method of calculating the mathematical expression for judging the presence or absence of content change by using the contents of the storage means as numerical data and using all the values. First, the contents of the storage means are regarded as numerical data, and the results obtained by adding all the values are stored as a check data in a part of the storage means. A method of comparing the value obtained by adding the values of and the value of the check data obtained by the previous calculation.

Secondly, the contents of the storage means are regarded as numerical data, and the result of exclusive OR of all the values is stored as a check data in a part of the storage means, and the calculation means stores the contents of the storage means at any time. A method of comparing the value of the result of exclusive OR of all the values regarded as numerical data with the value of the check data obtained by the previous calculation.

Thirdly, the contents of the storage means are regarded as numerical data, and the result of calculation by making a mathematical formula such as M series is stored as a check data in a part of the storage means, and the calculation means stores the contents of the storage means at any time. Is regarded as numerical data, and a value obtained as a result of calculation by making a mathematical expression such as an M series and a value of check data obtained by the previous calculation are compared.

[0007]

SUMMARY OF THE INVENTION That is,
An arithmetic processing unit that performs an abnormal process of stopping the arithmetic process immediately stops the arithmetic process regardless of the content of the abnormality of the storage unit. It did not have the function of preventing.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and includes an arithmetic means, a program means,
And an arithmetic processing unit composed of storage means,
It has a first storage means having data including a constant and check data for checking the data, a second storage means having the same content as the first storage means, and further, there is an abnormality in the content of the data. A determination means is provided for determining whether or not an abnormality has occurred, and when the abnormality is not determined as a result of the determination, it is regarded as normal, and when an abnormality occurs,
Copying means for copying the contents of the storage means on the side determined to be normal to the storage means on the side determined to be abnormal is provided.

[0009]

The operation of the present invention has the same contents as the first and the second.
When the contents of one of the first or second storage means are abnormal, the contents of the other storage means are copied to the storage means in which the abnormality has occurred, and the arithmetic processing is continued. It has a recovery function of storage means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, which will explain the present invention in detail. In the figure, reference numerals 1 and 2 denote a computing means and a programming means having the same functions as those of 1 and 2 in FIG. Also,
In the figure, 3a and 3b are storage means having the same function as 3 in FIG. 2, 4 is a judging means, and 5 is a copying means.

The arithmetic means 1 executes arithmetic processing while referring to the data stored in the storage means 3a or 3b according to the program stored in the program means 2 as necessary. The storage means 3a, 3b store data, and the value of the result of judgment and calculation of the content is stored as a check data in a part of the storage means 3a, 3b.

The determination means 4 performs a determination calculation on the contents of the data stored in the storage means 3a, 3b at any time while the calculation means 1 is executing the calculation processing, and the value of the result and the check data are checked. Based on the value, it is determined whether or not an abnormality has occurred in the data in the storage means 3a, 3b.

As a result of this judgment, the copying means 5 continues the arithmetic processing if it is judged that neither the storage means 3a nor 3b is abnormal, and if either one of the storage means is abnormal,
The contents of the storage means on the side not determined to be abnormal are copied to the storage means on the side determined to be abnormal to restore the storage means. By doing so, it is possible to configure an arithmetic processing unit that prevents the arithmetic processing from being stopped. The determining unit 4 and the copying unit 5 can be realized by hardware or software.

[0014]

As described above, according to the present invention, when the content of the storage means is abnormal, the content of the storage means on the normal side is copied to the storage means on the abnormal side, and the recovery processing of the storage means is performed. Since the processing is continued, it is possible to prevent an unnecessary calculation stop and configure an arithmetic processing unit having a storage device recovery function.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an arithmetic processing unit showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional arithmetic processing device.

[Explanation of symbols]

 1 computing means 2 programming means. 3 Storage Means 3a Storage Means 3b Storage Means 4 Judging Means 5 Copying Means

Claims (1)

[Claims] In an arithmetic processing device comprising an arithmetic means, a program means, and a storage means, a first storage means having data including a constant and check data for checking the data, and the same contents as the first storage means. And a determination means for determining whether or not an abnormality has occurred in the contents of the data including the constant, and when the determination result indicates that no abnormality has occurred, it is regarded as normal and an abnormality is detected. An arithmetic processing unit comprising a copying means for copying the contents of the storage means on the side determined to be normal to the storage means on the side determined to be abnormal when they occur.