JP2000020351A - Device and method for processing information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for processing information with which the preparation of a program is facilitated and information processing can be speedily performed without requiring any software processing for checking data out of range. SOLUTION: When data requiring a range check are inputted, a CPU 1 inside the information processor stores these data in the prescribed area of a memory 3 corresponding to the kind. A comparator circuit 2 compares data in the memory 3 with the minimum and maximum values of data within an allowable range inside memories 4 and 5 and when data out of the range are detected, it is reported by imposing an interruption on the CPU 1. The CPU 1 receives the notice and abandons these data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus requiring high reliability such as a signal security apparatus, and more particularly to a data range check for the information processing.

[0002]

2. Description of the Related Art In this type of information processing apparatus, the "data range" is an allowable range of values handled by the apparatus in order for the apparatus to continue operating normally. Data exceeding the allowable range is referred to as “out-of-range data”. The information processing device cannot operate normally when using the out-of-range data, not when it is obtained.

As a method of protecting the data, there is a method in which a data range is checked by software before using the data, and if the data is out of the range, a process corresponding to the data is performed.

Referring to FIG. 2, this conventional method will be described.
As shown in FIG. 2A, an allowable range value (minimum value, maximum value) of the data that requires a range check is set in the memory 22 in advance. That is, 22-1 is a memory area for storing the x data minimum value, 22-2 is a memory area for storing the x data maximum value, and so on. When the information processing apparatus obtains the data that requires the range check, the data is compared with the allowable range value using a comparison instruction of the CPU 21 as shown in FIG. 2B.

If the result of the comparison indicates that the data is out of range, the CPU 21 uses a JUMP instruction or the like, and shifts the execution to processing corresponding to this. That is, the CPU 21
FIG. 2 (b), where data requiring a range check is input.
Call the routine. The minimum value of the x data input in step 11 (hereinafter referred to as S11) is stored in the memory area 2
The data read from 2-1 and the x data input in S12 are compared with the x data minimum value. As a result of the comparison, if x data> x data minimum value (S13), the maximum value of the x data is read from the memory area 22-2 in S14 and compared with the x data in S15. As a result of the comparison, if x data <x data maximum value, the x data is within the allowable range and is stored at a required location in the memory.

If x data <x data minimum value in S13, and if x data> x data maximum value in S16, the process jumps to S18 and performs necessary processing as out-of-range data.

[0007]

According to the above-mentioned conventional method, out-of-range data can be removed, so that instability of the operation of the information processing apparatus due to use of out-of-range data can be eliminated. Each time data is entered,
It is necessary to execute a program as shown in (b),
There is a problem that information processing takes time.

The present invention has been made under such circumstances, and does not require software processing to check out-of-range data, making it easy to create a program and performing information processing promptly. It is an object to provide an information processing apparatus and an information processing method.

[0009]

In order to achieve the above object, according to the present invention, an information processing apparatus is set as described in (1) and (2) below, and an information processing method is set as set forth in (3) below. Constitute.

(1) An information processing apparatus for performing required arithmetic processing based on data of a value within an allowable range, wherein data which needs a range check input from outside is preset according to the type of the data. A first memory to be stored in an area, a second memory in which a minimum value within an allowable range of each type of data is stored in an area corresponding to a storage area of each type of data in the first memory, When the maximum value within the allowable range of each type of data is previously stored in an area corresponding to the storage area of each type of data in the first memory, and data requiring a range check is input from outside. Storing means for storing the data in the first memory; storing the data stored in the first memory in the minimum value stored in the second memory; and storing the data in the third memory. A comparator for comparing a value, the first
And the minimum value stored in the storage area of the second memory corresponding to the storage area of the data, and the maximum value stored in the storage area of the third memory corresponding to the storage area of the data. An information processing apparatus comprising: a data supply unit that supplies a value to the comparison circuit; and a notification unit that notifies a predetermined location of a detection of out-of-range data when the comparison circuit detects out-of-range data.

(2) In the information processing apparatus according to (1), when the notifying unit notifies the out-of-range data,
An information processing apparatus including a discarding unit that discards the data according to the notification.

(3) An information processing method in an information processing apparatus for performing required arithmetic processing based on data of a value within an allowable range, wherein a first step of externally inputting data that requires a range check is compared with a first step. The first
A second step of comparing the data input in the step with the minimum value and the maximum value within the allowable range of the data;
A third step of discarding out-of-range data when the second step detects out-of-range data.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to embodiments of an information processing apparatus.

The present invention is not limited to the information processing apparatus, but can be similarly implemented in the form of an information processing method.

[0015]

FIG. 1 shows a main configuration of an "information processing apparatus" according to an embodiment. In FIG. 1, reference numeral 1 denotes a CPU for performing required information processing. Reference numeral 2 denotes a comparison circuit that compares required data with the minimum value and the maximum value within the allowable range, and notifies the CPU 1 by interrupting the data when the data is out of range. Reference numeral 3 denotes a memory A in which required x, y data and the like are written from the CPU 1, and reference numeral 4 denotes a memory B in which minimum values within an allowable range of the required x, y data and the like are stored in advance.
Numeral 5 is a memory C in which a maximum value within an allowable range of required x, y data and the like is stored in advance. In the memory A, the storage area of each x, y data and the like, that is, the address is predetermined as shown in 3-1. In the memories B and C, the minimum value of x data and the maximum value of x data are stored in the address corresponding to the address of x data in the memory A, and similarly, the y data is stored in the address corresponding to the address of y data in the memory A. The minimum value and the maximum data value are stored. Regarding other data, the minimum value and the maximum value of the other data are stored in the addresses of the memories B and C corresponding to the addresses of the memory A.

Next, the operation will be described. The memories A, B, and C are always read enabled.
When data requiring a range check is input from outside, the CPU 1 supplies an address predetermined according to the type of the data to the address bus, selects the memories A, B, and C, and stores the memory A in the memory A. After write enable, return to read enable. This allows
The data and the minimum and maximum values of the data are supplied to a comparison circuit.

The comparison circuit 2 compares the data. If x data <minimum value of x data or x data> maximum value of x data, the comparison circuit 2 interrupts the CPU 1 to notify the out-of-range data. Is done. Upon receiving this notification, the CPU 1 performs appropriate processing such as discarding the x data.

In this manner, each time data is written from the CPU 1 to the memory A, the comparator 2 checks whether the data is within the allowable range. Since the required information processing is performed using only the data of (i), the required information processing can be performed promptly without instability of the operation.

It should be noted that an appropriate circuit can be used for the comparison circuit.

[0020]

As described above, according to the present invention,
Since the out-of-range data is checked only by hardware, it is easy to create a program for information processing, and required information processing can be performed quickly.

Further, since out-of-range data can be checked by hardware, it is easy to create an information processing program.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of an embodiment.

FIG. 2 is an explanatory view of a conventional example.

[Explanation of symbols]

 1 CPU 2 comparison circuit 3, 4, 5 memory

Claims (3)

[Claims] 1. An information processing apparatus for performing a required arithmetic process based on data of a value within an allowable range, wherein an externally input data requiring a range check is stored in an area set in advance according to the type of the data. And a minimum value within an allowable range of each type of data is stored in the first memory.
The second memory pre-stored in the area corresponding to the storage area of each type of data in the memory and the maximum value within the allowable range of each type of data are stored in the storage area of each type of data in the first memory. A third pre-stored in the corresponding area
And a storage means for storing, when data requiring a range check is input from the outside, in the first memory, and storing the data stored in the first memory in the second memory. A comparison circuit for comparing the minimum value with the maximum value stored in the third memory; the data stored in the first memory and the minimum value stored in the storage area of the second memory corresponding to the storage area of the data; Data supply means for supplying the maximum value stored in the storage area of the third memory corresponding to the storage area of the data to the comparison circuit, and when the out-of-range data is detected in the comparison circuit, And a notifying means for notifying a predetermined location of the notification. 2. The information processing apparatus according to claim 1, wherein
An information processing apparatus, comprising: a discarding unit that, when the notifying unit notifies of out-of-range data, discards the data according to the notification. 3. An information processing method in an information processing apparatus for performing required arithmetic processing based on data of a value within an allowable range, comprising: a first step of externally inputting data requiring a range check; A second step of comparing the data input in the first step with the minimum value and the maximum value within the allowable range of the data, and discarding the data when the out-of-range data is detected in the second step An information processing method, comprising: