JPS59109876A - Detection for abnormality of memory holding storage battery - Google Patents

Abstract

PURPOSE:To detect the abnormality of a storage battery on a basis of the comparison result, by providing a means which stores the same data as reference data, which is stored in a non-volatile memory, in a volatile memory preliminarily and compares both data with each other when an information processing system is restarted. CONSTITUTION:When the information processing system starts the operation, a comparison table 7 where comparison data of the same contents as a reference table 6 in an ROM1 is stored in a prescribed position. Consequently, as long as a normal power is supplied to a memory 2, comparison data in the comparison table 7 is equal to reference data. If power supply becomes abnormal, comparison data in the comparison table 7 is destroyed and does not coincide with reference data in the reference table 6. When a restart processing mechanism 8 is started, a comparing circuit 9 compares data extracted from the reference table 6 in the memory 1 with data extracted from the comparison table 7 in the memory 2 and discriminates the normality of a power source 3 if they coincide with each other. As the result, the abnormality of the power source due to troubles of a feeding path 4 is detected overall.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to an information processing system, and in particular to a memory that reliably detects an abnormality in a storage battery provided for retaining data stored in a volatile memory. Concerning retention storage battery abnormality detection method.

Tbl Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional memory retention battery abnormality detection method. In FIG. 1, a read-only memory 1 provided as a nonvolatile memory stores information that does not need to be changed, such as a program that controls the operation of an information processing system (not shown), and is provided as a volatile memory. The optional read/write memory 2 stored therein stores data specific to the information processing system. The read/write memory 2 is constantly supplied with power from a storage battery 3 via a power supply path 4, and data once stored is retained without change unless the power supply malfunctions. Therefore, in order to properly retain the data stored in the read/write memory 2 and to ensure normal operation of the information processing system, it is necessary to need to be closely monitored. In FIG. 1, a power supply monitoring circuit 5 is attached to the storage battery 3 and constantly monitors the output voltage of the storage battery 3. When it detects that the output voltage deviates from the reference value, it issues an alarm and l't (prompt n.

As is clear from the above description, in the conventional memory storage battery abnormality detection system, the power supply monitoring circuit 5 monitors the output voltage of the storage battery 3 that supplies power to the write/read memory 2 at any time. However, such a power supply monitoring circuit 5 cannot detect abnormalities in the power supplied to the read/write memory 2 at any time due to a failure in the power supply path 4.
There was a desire to paralyze the operation of the information processing system.

fc) Object of the Invention The object of the present invention is to eliminate the drawbacks of the conventional memory retention storage battery abnormality detection method as described above, and to provide a means for reliably detecting abnormal cooling of the power supply supplied to the read/write memory 2 at any time. It lies in the realization.

(d) Structure of the Invention The object of the present invention is to provide an information processing system equipped with a volatile memory whose storage contents are permanently retained by a storage battery, in which comparison data identical to reference data stored in the non-volatile memory is stored in the volatile memory. means for comparing the comparison data extracted from the volatile memory with the reference data extracted from the non-volatile memory when the information processing system is restarted; This is achieved by detecting abnormalities in

+e) Examples of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a memory storage battery abnormality detection method according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, a reference chifur et al. is provided in the read-only memory 1. In FIG. In the standard chief fluro, predetermined standard data (for example, 1
0101 (number hyde data consisting of 110) is stored.

Further, a comparison table 7 that stores comparison data having the same content as the reference table 6 in the read-only memory 1 when the information processing system starts operating is stored in the read-out memory 2 at a predetermined location. Therefore, as long as constant power is supplied to the read/write memory 2, the comparison data in the comparison chiffle 7 will be maintained equal to the reference data in the reference table 6. However, if the power supply becomes abnormal, , the comparison data in comparison table 7 is destroyed,
The reference data in the reference table 6 no longer matches. On the other hand, a comparison circuit 9 is provided in the restart processing mechanism 8 that controls the restart processing of the information processing system, and when the restart processing device 4MY8 is activated when the information processing system is restarted, the comparison circuit 9 is transferred to a read-only memory. The reference data extracted from the reference table 6 in 1 and the 1-inclusive readout memory Z at any time.
The comparison data extracted from the comparison table 7 in
It is determined that the power supply that is being supplied to the readout memory 2 at any time via the power source 2 is at full power, and the restart processing is continued. Further, when the comparison circuit 9 detects a mismatch between the reference data and the comparison data, it determines that the power supply supplied to the read/write memory 2 is in an abnormal state and stops the restart process; ) to prompt diagnosis and repair of the storage battery 3 or power supply path 4.

As is clear from the above description, according to the present embodiment, an abnormality in the power supplied to the continuous write memory 2 is caused by the contents of the comparison table 7 in the continuous write memory 2 and the read-only memory 1. Since it is detected based on the mismatch with the contents of the reference table 6, it becomes possible to comprehensively detect abnormalities in the power supply due to failures in the power supply path 4 as well as in the storage battery 3.

It should be noted that FIG. 2 is merely one embodiment of the present invention, and the configuration of the restart processing mechanism 8 is not limited to that shown in the figure, for example, and numerous modifications may be made to, for example, the configuration of the program. However, the effects of the present invention do not change in either case. Further, the configurations of the volatile memory and the non-volatile memory are not limited to the illustrated read/write memory 2 and the read-only memory 1, and many other modifications may be considered, but in any case, the present invention is applicable. The effect of is unchanged.

(fl　Effects of the invention

Claims (1)

[Claims] In an information processing system equipped with a volatile memory whose storage contents are always retained by a storage battery, comparison data that is the same as reference data stored in the nonvolatile memory is stored in advance in the volatile memory, and the information processing system A memory characterized in that means is provided for comparing the comparison data extracted from the volatile memory and the reference data extracted from the nonvolatile memory at the time of restart, and an abnormality in the storage battery is detected based on the comparison result of the means. Battery abnormality detection method before holding.