JPH09282863A - Recording method in flight recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize loss of recording capacity to effectively use a memory by inspecting failure of a flash memory in unit of an erasing block before recording of data. SOLUTION: A memory management means 1 administrates a flash memory 2 for each erasing block and sequentially records data toward the end portion from the leading portion of the erasing block. In this case, the management means 1 inspects whether the erasing block at the destination to store the data is defective or not. When the relevant erasing block is normal, data is recorded in this block but if it is defective, the next erasing block as the destination is inspected whether it is defective or not. When it is normal, the recording process is continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method in a flight recorder, and more particularly, it effectively manages a memory by managing a memory failure on a block-by-block basis and skipping the defective block if any. The present invention relates to a recording method in a flight recorder that can be used and can minimize data loss.

[0002]

2. Description of the Related Art An aircraft is provided with a flight recorder for recording voice data of crew members, environmental sound data and flight data for the purpose of investigating the cause of an accident such as an accident. There is. The flight recorder needs a recording method that can survive a harsh environment for the purpose, and in recent years, a semiconductor memory has been used, and in particular, a nonvolatile and large-capacity flash memory has been adopted.

A flash memory is a memory in which the contents can be written bit by bit by applying an electrical signal to one or more pins and can be erased in blocks, which is stable for a long time without power supply. Is.

The standard for the time to be recorded is defined. For example, the voice data of crew members is 30 minutes for 3 systems, the environmental sound data is 30 minutes for 1 system, and the flight data is 1 system. It records 10 hours. In order to satisfy this standard, the recording device of the conventional flight recorder is equipped with a plurality of flash memories so that a long flight can be recorded.

Next, a recording method in a conventional recording apparatus for a flight recorder will be described. The conventional recording method manages the flash memory in units of memory chips, verifies failure of the memory chips in advance, and does not record data in the memory chip determined to be defective. . To realize this recording method,
The configuration mainly includes a memory and a memory management unit.

In the conventional recording method, the memory management means is
First, check that there is no failure in the memory chip, if you do not find the failure in the memory chip, record the data, and if you determine that the memory chip is defective, skip that memory chip. Then, the data was recorded in the next memory chip.

Therefore, in the conventional recording method, even if the memory failure is minute, for example, included in one erase block unit, the memory management means fails in the memory chip including the block. The memory chip is skipped and the data is recorded in the next memory chip.

Therefore, the area in which data can be recorded is the area excluding one memory chip at the maximum, and since the flash memory has a large capacity, the removed recording area becomes large and the above standard can be satisfied. Disappeared
Data loss was high.

[0009]

However, in the above-mentioned conventional recording method in the flight recorder, failure management is performed for each memory chip and recording is performed while skipping the defective memory chip. There is a problem in that the memory chip is skipped for recording, the memory chip cannot be effectively used, and the recording capacity is insufficient, resulting in a large amount of data loss.

Further, in the above-mentioned conventional recording method in the flight recorder, since the flash memory having a large memory capacity of 1 chip is used, the recording amount and the recording time lost by the skipped chips become large and the data loss amount. There was a problem that there were many.

The present invention has been made in view of the above situation, and manages a failure for each erase block of a flash memory, and skips only the defective block for recording, thereby preventing a huge loss of a recording area. It is an object of the present invention to provide a recording method in a flight recorder that can be used, can effectively use the memory, and can thereby minimize the amount of data loss due to insufficient recording capacity.

[0012]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems of the conventional example has a flash memory for recording flight-related data and a memory management means for recording the data in the flash memory. A recording method in a flight recorder, wherein the memory management means checks the flash memory for a failure in erase block units before recording the data, and if normal, records the data in the block and fails. In that case, the block is skipped and the data is recorded in the next normal block. By minimizing the loss of the storage capacity, the memory can be effectively used and the amount of data loss can be minimized.

[0013]

Embodiments of the present invention will be described with reference to the drawings. The recording method in the flight recorder according to the embodiment of the present invention manages the recording operation for each erase block of the flash memory, determines a failure for each block, skips the defective block and records the block. As a result, it is possible to prevent the loss of a huge recording area, effectively use the memory, and minimize the amount of data loss due to lack of storage capacity.

The flight recorder according to the embodiment of the present invention has a recording device for recording voice data and flight data in a flash memory or the like. A recording device in the flight recorder according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration block diagram of a recording device of a flight recorder according to an embodiment of the present invention.

As shown in FIG. 1, the recording device in the flight recorder of this embodiment is basically composed of a flash memory 2 composed of a plurality of chips and a memory management means 1 for recording input data in the flash memory 2. It is configured to Furthermore, each chip in the flash memory 2 is divided into a plurality of erase blocks (1 to N).

Next, a specific operation of the memory management means 1 will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing the contents of the flash memory 2 managed by the memory management means 1, and FIG. 3 is a flow chart showing the recording processing in the memory management means 1.

The memory management means 1, as shown in FIG.
The flash memory 2 is managed for each erase block, and data is recorded in order from the beginning to the end of the erase block. A failure inspection is performed at the time of recording, and if a failure is found in the block, the block is skipped. Is.

For example, when the n-th erase block has a failure, the memory management means 1 records data in order from the first erase block 1, and since the erase block n has a failure, it is stored there. Does not record the data, but records the data to be recorded in the erase block n in the next erase block n + 1.

Next, the data recording process of the memory management means 1 will be described. In FIG. 3, first, the memory management means 1 checks whether or not the erase block to which the data is stored is normal (whether there is no failure) (S1). If the erase block is normal, data is recorded in the block (S2) and it is checked whether the recording is completed (S3). If the recording is finished, the process is finished.

If the recording has not been completed, it is checked whether or not there is still a space in the recorded erase block (S
4) If there is a free space, recording is continued, and if there is no free space, the process moves to the next erase block (S5). When the erase block is moved to the next erase block, the process returns to the step S1 for checking whether the erase block is normal and the recording process is continued.

In addition, a check is made as to whether or not the erase block in which the data is stored is normal (whether there is no failure) (S1).
In step S1, if an abnormality is found in the erase block, the process moves to the next erase block (S6), and a process S1 of checking whether the erase block that has been moved again is normal or not.
Return to and continue the recording process.

According to the recording apparatus of the flight recorder of the present embodiment, the flash memory of the recording apparatus is managed in erase block units, and if there is a defective erase block, only that erase block is skipped and recorded. Since the data is recorded in the erase block which has not failed in the same memory chip, the memory can be effectively used by minimizing the loss of the storage capacity, and the amount of data loss can be minimized. You can

[0023]

According to the present invention, the memory management means inspects a flash memory for a failure in units of erase blocks before recording data, and if there is no failure, records the data in the block and detects the failure. If this is the method of recording in a flight recorder that skips that block and records the data in the next normal block, the memory can be used effectively by minimizing the loss of storage capacity, and the amount of data loss should be minimized. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a schematic configuration block diagram of a recording device of a flight recorder according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the contents of a flash memory 2 of the recording device of the flight recorder of the present embodiment.

FIG. 3 is a flowchart showing a recording process in the memory management means 1 of the recording device of the flight recorder according to the present embodiment.

[Explanation of symbols]

 1 ... Memory management means, 2 ... Flash memory

Claims (1)

[Claims] 1. A recording method in a flight recorder having a flash memory for recording flight-related data and a memory management means for recording the data in the flash memory, wherein the memory management means records the data. Prior to this, the flash memory is inspected for a failure in erase block units, and if it is normal, the data is recorded in the block, and if it is a failure, the block is skipped and the data is recorded in the next normal block. A recording method in a flight recorder characterized by the above.