JP2022114470A - Information recording device and information recording method - Google Patents

Abstract

To make it possible to obtain information immediately before an unexpected operation of a CPU compared with the traditional case.SOLUTION: A device comprises an information acquisition part 101 that acquires communication information among a CPU2 and one or more RAMs 3, an information recording part 102 that stores the communication information acquired by the information acquisition part 101, and an information output part 103 that outputs the communication information stored in the information recording part 102 to outside in response to a reading request from outside.SELECTED DRAWING: Figure 2

Description

The present invention relates to an information recording apparatus and information recording method for analyzing the operation of a CPU (Central Processing Unit).

Conventionally, a technique for diagnosing a failure of a system having a CPU is known (see, for example, Patent Document 1). In the technique disclosed in Patent Document 1, the CPU issues an instruction to the movable part to operate the system, and the sensor detects the operation, thereby confirming whether there is an abnormality in the movable part and the sensor. there is

JP 2018-47536 A

However, the technology disclosed in Patent Document 1 is based on the premise that the program always operates normally and that the response of the sensor unit is within the expected range. Therefore, if the CPU stops due to the program not operating normally or the sensor section makes an unexpected response, or if the CPU reboots (resets) due to the program not operating normally, This system stops working and cannot check the response value of the sensor unit. Therefore, in such a case, information relating to investigation of the cause of failure is limited.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording apparatus capable of acquiring information immediately before an unexpected operation of the CPU.

An information recording device according to the present invention comprises an information acquisition unit that acquires communication information between a CPU and one or more RAMs, an information recording unit that records the communication information acquired by the information acquisition unit, and an external and an information output unit for outputting the communication information recorded in the information recording unit to the outside in response to the read request.

According to the present invention, since it is configured as described above, it is possible to acquire information immediately before an unexpected operation of the CPU, unlike the conventional art.

1 is a diagram showing a configuration example of an entire system including an information recording device according to Embodiment 1; FIG. 1 is a diagram showing a configuration example of an information recording apparatus according to Embodiment 1; FIG. 4 is a flow chart showing an operation example of the information recording apparatus according to Embodiment 1; FIG. 7 is a diagram showing a configuration example of an information recording apparatus according to Embodiment 2; FIG. 11 is a diagram showing a configuration example of an information recording apparatus according to Embodiment 3; FIG. 13 is a diagram showing a configuration example of an information recording apparatus according to Embodiment 4;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1.
FIG. 1 is a diagram showing a configuration example of an entire system including an information recording apparatus 1 according to Embodiment 1. As shown in FIG.
The information recording device 1 is connected to a communication path between the CPU 2 and one or more RAMs 3 (Random Access Memory) and acquires information for operation analysis of the CPU 2 . As the information recording device 1, for example, an FPGA (Field-Programmable Gate Array) is used.

The CPU 2 is installed in the system and communicates with one or more RAMs 3 . That is, since the CPU 2 does not have a large storage capacity, it performs processing while exchanging information with the RAM 3, which has a larger storage capacity than the CPU 2 does. FIG. 1 shows the case where the CPU 2 communicates with two RAMs 3 .

The information recording apparatus 1 includes an information acquisition section 101, an information recording section 102, and an information output section 103, as shown in FIG.

Information acquisition unit 101 acquires communication information between CPU 2 and RAM 3 . The communication information acquired by the information acquisition unit 101 is information itself indicating the content of communication exchanged between the CPU 2 and the RAM 3, and includes information indicating commands such as read commands and write commands.

The information recording unit 102 records communication information acquired by the information acquisition unit 101 .

Information output unit 103 outputs communication information recorded in information recording unit 102 to the outside in response to a read request from the outside.

Next, an operation example of the information recording apparatus 1 according to Embodiment 1 shown in FIGS. 1 and 2 will be described with reference to FIG.
In the operation example of the information recording apparatus 1 according to Embodiment 1 shown in FIGS. 1 and 2, as shown in FIG. step ST301). Acquisition of communication information by the information acquisition unit 101 is always performed in real time while communication information is exchanged between the CPU 2 and the RAM 3 .

Next, information recording section 102 records the communication information acquired by information acquisition section 101 (step ST302). The communication information is recorded by the information recording unit 102 each time the information acquisition unit 101 acquires communication information.

Thereafter, information output section 103 outputs the communication information recorded in information recording section 102 to the outside in response to a read request from the outside (step ST303). That is, when the operation of the CPU 2 stops due to a problem, the user who uses the system in which the CPU 2 is installed requests the information recording device 1 to read the communication information. The information output unit 103 outputs the communication information recorded in the information recording unit 102 in response to the user's request. After that, the user analyzes the operation of the CPU 2 using the communication information output by the information output unit 103 .

Here, in a system such as a general-purpose PC (Personal Computer) that uses a RAM 3 or storage (SSD (Solid State Drive), HDD (Hard Disc Drive), etc.) separately from the CPU 2, if a malfunction occurs It is designed to record the operating status as a log in the storage so that the cause can be investigated. However, in this system, if the CPU 2 performs an unexpected operation (stops or reboots) due to a problem, the operation of recording the log in the storage also stops. It is not possible to confirm from the information in the log.

On the other hand, since the CPU 2 does not have a large storage capacity, processing is performed while exchanging information with the RAM 3, which has a larger storage capacity than the CPU 2. directly connected to Therefore, when the CPU 2 performs an unexpected operation, this information can be used to check the previous operation compared to the log recorded in the storage.

Therefore, in the information recording apparatus 1 according to Embodiment 1, communication information between the CPU 2 and the RAM 3 is constantly recorded, and the recorded communication information can be output to the outside in response to a read request from the outside. As a result, when a problem occurs in the CPU 2, the user using the system can issue a read request to the information recording device 1 to acquire the communication information, thereby determining what kind of operation the CPU 2 will perform based on the communication information. It is possible to confirm in detail whether or not the CPU 2 has been broken, and it is possible to identify the cause of the unexpected operation including the failure of the CPU 2 or the like.

As described above, according to the first embodiment, the information recording apparatus 1 includes the information acquisition unit 101 for acquiring communication information between the CPU 2 and one or more RAMs 3, and the information acquired by the information acquisition unit 101. and an information output unit 103 for outputting the communication information recorded in the information recording unit 102 to the outside in response to a read request from the outside. As a result, the information recording apparatus 1 according to the first embodiment can acquire information immediately before the unexpected operation of the CPU 2 compared to the conventional one.

Embodiment 2.
In the information recording apparatus 1 according to the first embodiment shown in FIG. 2, the communication information between the CPU 2 and the RAM 3 is constantly recorded, and the recorded communication information can be output to the outside in response to a read request from the outside. It is configured. On the other hand, a system equipped with the CPU 2 may have a WDT (watch dog timer) function. In a system having this WDT function, when the CPU 2 stops, a reset signal (HW RESET signal) is input to the CPU 2 to forcibly restart the CPU 2 . In this case, in the information recording apparatus 1 according to Embodiment 1 shown in FIG. put away. Therefore, a configuration for solving this problem will be described.

FIG. 4 is a diagram showing a configuration example of the information recording apparatus 1 according to Embodiment 2. As shown in FIG. In the configuration example of the information recording apparatus 1 according to Embodiment 2 shown in FIG. 4, a reset signal detection section 104 is added to the information recording apparatus 1 according to Embodiment 1 shown in FIG. Other configurations of the information recording apparatus 1 according to Embodiment 2 shown in FIG. 4 are the same as those of the information recording apparatus 1 according to Embodiment 1 shown in FIG. Give an explanation.

The reset signal detection unit 104 detects a reset signal (HW RESET signal) input to the CPU 2 by using the WDT function of the system in which the CPU 2 is mounted. In this case, the system uses the WDT function to input the reset signal to the information recording device 1 when inputting the reset signal to the CPU 2 . The reset signal detection unit 104 detects the reset signal input to the information recording apparatus 1 to detect the reset signal input to the CPU 2 .

Further, the information recording unit 102 according to the second embodiment stops recording communication information when the reset signal detection unit 104 detects a reset signal.

As described above, in the information recording apparatus 1 according to the second embodiment, when the CPU 2 is restarted by the WDT function, sampling of communication information is stopped and recording of the communication information is stopped. As a result, in the information recording apparatus 1 according to the second embodiment, it is possible to prevent the communication information recorded immediately before the CPU 2 is stopped from being overwritten and lost.

In the above description, the reset signal detection unit 104 detects the reset signal by the WDT function. However, the restart of CPU2 is caused not only by the WDT function, but also by rebooting CPU2. When the CPU 2 is rebooted, the CPU 2 is restarted without being stopped, and in this case, resetting by the WDM function does not occur. Therefore, the reset signal detection unit 104 may be configured to detect at least one of the reset signal by the WDT function and the reboot of the CPU 2 .

Embodiment 3.
In the information recording apparatus 1 according to the first embodiment shown in FIG. 2, the communication information between the CPU 2 and the RAM 3 is constantly recorded, and the recorded communication information can be output to the outside in response to a read request from the outside. It is configured. However, in this configuration, since only communication information is stored, it is not possible to grasp when the communication was performed. It is not possible to confirm the timing such as whether or not there is. Therefore, a configuration for solving this problem will be described.

FIG. 5 is a diagram showing a configuration example of the information recording apparatus 1 according to Embodiment 3. As shown in FIG. In the configuration example of the information recording apparatus 1 according to Embodiment 3 shown in FIG. 5, a timer 105 is added to the information recording apparatus 1 according to Embodiment 1 shown in FIG. Other configurations of the information recording apparatus 1 according to Embodiment 3 shown in FIG. 5 are the same as those of the information recording apparatus 1 according to Embodiment 1 shown in FIG. Give an explanation.

The clock unit 105 clocks the time when the communication information is acquired by the information acquisition unit 101 .

Further, the information recording unit 102 in Embodiment 3 records the communication information acquired by the information acquisition unit 101 together with information (time stamp) indicating the time measured by the clock unit 105 .

As described above, the information recording apparatus 1 according to the third embodiment adds a time stamp to the recorded communication information. As a result, in the information recording apparatus 1 according to the third embodiment, the user can analyze the operation of the CPU 2 in consideration of the time axis, and the analysis efficiency is improved.

Note that the information recording apparatus 1 according to the third embodiment shown in FIG. 5 shows the case where the above function is added to the information recording apparatus 1 according to the first embodiment. However, without being limited to this, the above function may be added to the information recording apparatus 1 according to the second embodiment, and the same effect as above can be obtained.

Embodiment 4.
In the information recording apparatus 1 according to the first embodiment shown in FIG. 2, the communication information between the CPU 2 and the RAM 3 is constantly recorded, and the recorded communication information can be output to the outside in response to a read request from the outside. It is configured. Here, for example, when the CPU 2 is communicating with a plurality of RAMs 3 as shown in FIG. Even in such a case, since the information recording apparatus 1 according to the first embodiment records the communication information between the CPU 2 and all the RAMs 3, unnecessary recording is performed. Therefore, a configuration for solving this problem will be described.

FIG. 6 is a diagram showing a configuration example of the information recording apparatus 1 according to Embodiment 4. As shown in FIG. In the configuration example of the information recording apparatus 1 according to Embodiment 4 shown in FIG. 6, a target selection unit 106 is added to the information recording apparatus 1 according to Embodiment 1 shown in FIG. Other configurations of the information recording apparatus 1 according to Embodiment 4 shown in FIG. 6 are the same as those of the information recording apparatus 1 according to Embodiment 1 shown in FIG. Give an explanation.

The target selection unit 106 selects the RAM 3 to be recorded among the plurality of RAMs 3 with which the CPU 2 communicates. At this time, the target selection unit 106 selects the RAM 3 selected by the user who uses the system equipped with the CPU 2 as the RAM 3 to be recorded.

Further, the information acquisition unit 101 in Embodiment 4 acquires communication information between the CPU 2 and the RAM 3 selected by the target selection unit 106 .

As described above, the information recording apparatus 1 according to Embodiment 4 is configured to be able to select the RAM 3 to be recorded when the CPU 2 is communicating with a plurality of RAMs 3 . As a result, in the information recording apparatus 1 according to the fourth embodiment, when it is known that the abnormality of the CPU 2 depends on the content of communication with the specific RAM 3, only the communication information with the specific RAM 3 is recorded. By narrowing down the recording target so as to record, it becomes possible to extend the period in which communication information can be recorded in the information recording apparatus 1 .

For example, as shown in FIG. 1, when the CPU 2 is communicating with the two RAMs 3, it is assumed that only the communication with the RAM 3 on the left side is abnormal. Then, when the user can grasp that fact, the RAM 3 on the left side is selected as the RAM 3 to be recorded. As a result, the information recording apparatus 1 can acquire only the communication information between the CPU 2 and the left RAM 3 without acquiring the communication information between the CPU 2 and the right RAM 3, thereby recording the communication information. It is possible to extend the possible period.

The information recording device 1 according to the fourth embodiment shown in FIG. 6 shows the case where the above function is added to the information recording device 1 according to the first embodiment. However, without being limited to this, the above function may be added to the information recording apparatus 1 according to Embodiment 2 or the information recording apparatus 1 according to Embodiment 3, and the same effect as described above can be obtained.

Further, within the scope of the present invention, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component in each embodiment. be.

1 information recording device 2 CPU
3 RAM
101 information acquisition unit 102 information recording unit 103 information output unit 104 reset signal detection unit 105 clock unit 106 target selection unit

Claims (5)

an information acquisition unit that acquires communication information between the CPU and one or more RAMs;
an information recording unit that records communication information acquired by the information acquisition unit;
An information recording device comprising: an information output unit that outputs communication information recorded in the information recording unit to the outside in response to a read request from the outside. A reset signal detection unit that detects at least one of a watchdog timer function of a system in which the CPU is mounted and a reset signal due to rebooting of the CPU,
2. The information recording apparatus according to claim 1, wherein the information recording section stops recording the communication information when the reset signal is detected by the reset signal detection section. A clocking unit that clocks the time when the communication information is acquired by the information acquisition unit,
3. The information recording apparatus according to claim 1, wherein the information recording unit records the communication information acquired by the information acquisition unit together with information indicating the time measured by the clock unit. A target selection unit for selecting a RAM to be recorded from among the plurality of RAMs with which the CPU communicates,
4. The information acquiring unit acquires communication information between the CPU and the RAM selected by the target selecting unit. information recording device. an information acquisition unit acquiring communication information between the CPU and one or more RAMs;
an information recording unit recording the communication information acquired by the information acquisition unit;
and an information output unit outputting the communication information recorded in the information recording unit to the outside in response to a read request from the outside.

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