JPH04199441A - Abnormal state recorder - Google Patents

Abstract

PURPOSE:To record only the information accordant with the desired conditions and to easily check the factor of the abnormality by discontinuing the recording of information to an information recording medium when the abnormality occurs to the information that is transmitted through a data bus, an address bus or a control signal bus connected to a CPU. CONSTITUTION:A gate 2 is provided together with a recording medium 3, a condition circuit (1) 4, a gate 5, a condition circuit (2) 6, end a setting circuit 6. The circuit 4 checks whether each bus satisfies the prescribed write conditions or not. If so, the circuit 4 applies a write pulse to the medium 3 via the gate 5. Meanwhile the circuit 6 closes the gate 5 to discontinue the write to the medium 3 when the abnormal condition of each bus is satisfied. Thus the abnormality occurring process is known when the recording contents of the medium 3 are checked after occurrence of the abnormality. Furthermore the medium 3 is independent of other recording media and therefore can take out its contents to the outside of an information processor with no loss of the contents. Thus the factor of the abnormality is easily checked.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an abnormal state recording device that includes a CPU and records the progress up to an abnormality in an information processing device.

[Conventional technology]

When investigating the cause of an abnormality in an information processing device equipped with a CPU, conventionally, as shown in Figure 4, after an abnormality occurs, software stored in the ROM in the device is used to check the RA in the device. The contents of the M area were displayed (a), printed (b), and transmitted (c) to the outside.

[Problem to be solved by the invention]

However, the conventional method described above has a problem in that only the memory image after the occurrence of the abnormality is known, and it is difficult to infer the process of the abnormality occurrence from the memory image. In addition, when investigating the cause of an abnormality, other functions of the device must be stopped, or if the device stops working at all, the cause cannot be investigated. Therefore, it is an object of the present invention to eliminate the above-mentioned problems and provide an abnormal state recording device.

[Means to solve the problem]

Second, the present invention provides an abnormal state recording device for recording the progress up to an abnormality in an information processing device equipped with a CPU, which is different from other recording media in the information processing device. an information recording medium for recording information transmitted via the data bus, address bus or control signal bus which is independent and connected to the cpvt; and when the information is information representing a predetermined condition; , comprising a recording means for recording the information on the information recording medium, and a recording stop means for stopping recording of the information on the information recording medium when an abnormal state occurs in the information processing apparatus at f2. It is said that

[Effect]

In the above configuration, one data bus connected to the CPU,
When the information transmitted via the address bus or the control signal bus is information representing a predetermined condition, the recording means records the information on the information recording medium. Then, when an abnormal state occurs in the information processing apparatus, the recording stop means stops recording information on the information recording medium. Therefore, by checking the recorded contents of the information recording medium after an abnormal state has occurred, it can be determined how the abnormal state has progressed. Furthermore, since the information recording medium is independent from other recording media, it can be taken out of the information processing device without losing its contents, and the cause of the abnormality can be investigated outside the location where the information processing device is located. Second, even if the information processing device stops working at all, the cause of the abnormality can be investigated. Furthermore, since only information representing predetermined conditions is recorded, it is easy to investigate the cause.

【Example】

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. FIG. 1 is a circuit diagram of an information processing apparatus equipped with an embodiment of the abnormal state recording device of the present invention. The abnormal state recording device of this embodiment includes a gate 2, a recording medium 3, a condition circuit (1) 4, a gate 5, and a condition circuit (2).
) 6 and a setting circuit 9. The gate 2 selects which of the information output to each of the data bus, address bus, and control signal bus that connects the CPU and various memories and devices 7 in the information processing apparatus is to be recorded on the recording medium 3. It is the gate of The conditional circuit (1) 4 detects whether or not each lotus is under a predetermined write condition, such as a memory fetch or a write to a specific I10 address, and when the write condition is met, the gate is activated. A write pulse is applied to the recording medium 3I through 5. The contents of each bus selected by the gate 2 are recorded on the recording medium 3 by this write pulse. On the other hand, the condition circuit (2) 6 detects an abnormal condition of each bus, such as a write to a ROM area or an access to a non-existent I10 address space, and closes the gate 5 when the abnormal condition is satisfied. Writing to the recording medium 3 is stopped. As a condition for stopping this writing, a cancellation condition from various memories or devices 7 or software 8 in the apparatus may be used instead of the above-mentioned abnormal conditions of each bus. Selection of recording information in gate 2, condition circuit (1)
The setting circuit 9 sets the write conditions in , and the abnormal conditions in the condition circuit (2). This setting circuit 9 may be a mechanical switch or may be a circuit switch set under the control of the CPU 1. As shown in FIG. 2, the recording medium 3 is composed of a writable memory 31 and a counter 32 that provides an address to this memory 31. Then, the memory 31
Signals from each bus are input to the data inputs DATAI to DATAn of the counter 3, and writing to the memory 31 is performed by the write signal WR from the gate.
2 is incremented). Therefore, the contents of each bus when the writing condition is satisfied and f2 is recorded on the recording medium 3 until the abnormal condition of each bus is satisfied. When an abnormal condition occurs, the recording medium 3 is taken out from this information processing apparatus, and as shown in FIG. 3, the contents are read by another apparatus 10 to investigate the cause of the abnormal condition. In this way, since the recording medium 3 is independent of the various memories in the device, it can be taken out from the device, and the cause can be investigated at a location other than the location where the device is installed without stopping other functions of the device. Even if the device stops working at all, the cause can be investigated. Also, since a signal is recorded when a predetermined writing condition is met,
Only signals that meet the intended conditions can be recorded, making it easier to investigate the cause.

【Effect of the invention】

As is clear from the above, the abnormal state recording device of the present invention records information when the information transmitted via the data bus, address bus, or control signal bus connected to the CPU is information representing a predetermined condition. The means records the information on the information recording medium, and when an abnormal state occurs in the information processing apparatus, the recording stop means stops recording the information on the information recording medium, so that the abnormality does not occur. By later examining the recorded contents of the information recording medium, the progress leading up to the abnormality can be ascertained, and the cause of the abnormality can be investigated. In addition, since the information recording medium is independent from other recording media, it can be taken out of the information processing device without losing its contents, and the cause of the abnormality can be investigated outside the location where the information processing device is located. In addition, even if the information processing device stops working at all, the cause of the abnormality can be investigated. Furthermore, since the information recording medium records only the information representing the predetermined conditions, only the information that meets the intended conditions can be recorded, making it easy to investigate the cause.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an L information processing device including an embodiment of the present invention, FIG. 2 is a configuration diagram of a recording medium in the above embodiment,
FIG. 3 is a diagram showing that the contents of the recording medium are checked by another device, and FIG. 4 is a diagram illustrating a conventional example. 1... CPU, 2 ・Gate, 3 g2 recording medium, 4
・Condition circuit (1), 5 gate, 6-・Condition circuit (2
), 9... Setting circuit.

Claims (1)

[Claims] (1) An abnormal state recording device that records the progress up to an abnormality in an information processing device equipped with a CPU, which is independent from other recording media in the information processing device,
an information recording medium for recording information transmitted via a data bus, address bus or control signal bus connected to the CPU; An abnormal state recording apparatus comprising: a recording means for recording on an information recording medium; and a recording stop means for stopping recording of information on the information recording medium when an abnormal state occurs in the information processing apparatus.