JPS62166450A - History analyzing device for logical unit - Google Patents

Abstract

PURPOSE:To improve the reliability of a history analyzing device by performing switching to a battery power source on error occurrence. CONSTITUTION:A storage circuit 4 is stored with the history of an information processor 1 in operation. If the information processor 1 becomes abnormal and an error detecting circuit 2 outputs an error detection signal ES, a power source switch 7 switches the power supply to the storage circuit 4 from a main power source 5 to the battery power source 6. The power supply from the battery power source 6 to the storage circuit 4 is carried on until the power supply is switched to the main power source 5 manually when the history is analyzed later.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a history analysis device for a logic device that performs a predetermined operation according to a program, which is applied to a computer, etc. The present invention relates to a history analysis device that searches for the cause of an error by recording and holding each state quantity of the device.

[Conventional technology]

Figure 2 is an example of a special edition! 49-135540 is a block diagram showing a conventional logic device history analysis device, in which 1 is an information processing device whose operation history is analyzed by this device, and 2 is an error detection circuit. ,
Built into the information processing device 1, it detects all abnormalities in the device itself and outputs detection signals. 3 is a control circuit of the history analysis device, and 4 is a storage circuit that stores all the various state quantities of the information processing device 1. do.

Next, the operation will be explained. First, when the information processing device 1 is normal and the error detection circuit 2 does not detect any abnormality,
The control circuit 3 controls one of the program operations of the information processing device 1.
At each step, the address and data of the information processing device 1 are written to the memory circuit 4. If the memory capacity is full at the Nth step of the program,
From the +1st step onwards, the memory circuit 4 is controlled to be overwritten from the beginning. In this way, the information processing device 1
The program execution history, such as addresses and data, is endlessly written into the memory circuit 4 in an infinite loop. Therefore,
When an abnormality occurs in the information processing device IK and the error detection circuit 2 outputs a detection signal, the control circuit 3 stops writing to the memory circuit 4. Therefore, the contents of the memory circuit 4 include the execution history from when an error is detected until the time when the error is detected and stored in an amount equal to the memory capacity of the memory circuit 4.

[Problem that the invention seeks to solve]

Since the conventional logic device history analysis device is configured as described above, if a power outage etc. occurs after an error occurs in the target information processing device 1 and the previous history is stored, but before the analysis starts. When this occurs, there is a problem in that the information that has been memorized is lost in an instant.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a history analysis device for a logical device that does not lose its memory contents even if a power outage occurs.

[Means for solving problems]

The logic device history analysis device according to the present invention adds a dedicated battery power source to the memory circuit, and switches the power source of the memory circuit from the main power source to the battery power source at the same time as the error detection circuit outputs an error detection signal. This is what I did.

[Effect]

In this invention, the power supply to the memory circuit is switched from the main power supply to the battery power supply when an error occurs, and the backup continues until the power supply is manually switched from the battery power supply to the main power supply.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the figure, the same parts as in FIG. 2 are designated by the same reference numerals. As can be seen in FIG. 1, 6 is a battery power source, and 7 is a power switch, which switches between the output from the main power source 5 and the output from the battery power source 6. The power source selected by the power source switch 7 is: The signal is supplied to the memory circuit 4.

Next, the operation will be explained. First, except for the power supply circuit, the operation is the same as that of the conventional example shown in FIG.

Then, the history of the operation of the information processing device 1 is stored in the storage circuit 4. Then, when an abnormality occurs in the information processing device 1 and the error detection circuit 2 outputs the error detection signal ESt-, the power supply switch 7 receives the error detection signal ES and switches the power supply to the storage circuit 4 from the main power supply 5. battery power from 6
Switch to. The power supply from the battery power source 6 to the memory circuit 4 continues until it is manually switched to the main power source 5 when analyzing the history later.

In the above embodiment, the circuit is configured to switch the power supply from the main power source to the battery power source before and after an error occurs, but a power drop detection circuit is provided in the main power source to detect power drop and
If the error occurrence conditions are ANDed to switch to the battery power source, the discharge of the battery power source can be further saved and the history after the error occurrence can be stored for a longer period of time.

[Effects of the Invention] As described above, according to the present invention, the power supply of the memory circuit is
The circuit is configured in such a way that the information processing equipment subject to history analysis is connected to the main power supply before an error occurs, and then switches to battery power as soon as the error occurs, which has the effect of significantly improving the reliability of the history analysis equipment. be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a history analysis device for an information processing device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional history analysis device for an information processing device. In the figure, 1 is an information processing device, 2Fi factory detection circuit, 3 is a control circuit, 4 is a storage circuit, 5 is a main power source, 6 is a batch power source, and 7 is a switch.

Claims (2)

[Claims] (1) History analysis of a logic device in which an error detection circuit detects an error operation from the operating state of the information processing device, transmits the error detection signal to a control circuit, and stores a history of logic operation errors in a storage circuit. The device includes a main power source and a battery power source as power sources for a storage circuit that stores the history of the target information processing device, and is connected to the main power source during normal operation and switches the power supply when an error occurs in the information processing device. 1. A history analysis device for a logic device, characterized in that power is supplied by switching from a main power source to a battery power source depending on the device. (2) The switching between the main power source and the battery power source is such that when an abnormality occurs in the target information processing device, the power source is switched from the main power source to the battery power source, and after the fact, it is possible to manually switch from the battery power source to the main power source when analyzing the memory contents. A history analysis device for a logical device according to claim 1, characterized in that: