JPH04153812A - Data updating method and storage device - Google Patents

Abstract

PURPOSE:To easily restart the update of data in a storage device even if interruption is initiated during the update by providing a 1st and a 2nd in-write display means. CONSTITUTION:When data stored in a data area 20 of the storage device 20 is updated, update data is written in an update data storage area 30 first and displayed on the 1st in-write display means 40 during the writing process. Then the update data in the update data storage area 30 is copied to the data area 20 and during this copying process and displayed on the 2nd in-write display means 50 during the copying process. When the updating process is restarted after being interrupted, the displays on the two in-write display means 40 and 50 are inspected to discard the data in the update data storage area 30 and write the update data, or start writing the update data in the update data storage area 30. Consequently, the restart after the interruption is easily made.

Description

[Detailed Description of the Invention] [Summary] A method for updating data in a storage device connected to a processing device, which prevents old and new data from mixing when data is interrupted while updating data in the storage device, and allows easy replay. The purpose of the present invention is to provide a data storage method that can be activated, and a storage device having a data area for storing data, an update data storage area for storing updated data, and a second area for displaying when writing to the update data storage area is being performed. The first writing in progress display means and the second write in progress display means for displaying that the data area is being written are provided. Check the contents of the writing in progress display means, and if writing is displayed in the first writing in progress display means, it means that writing to the update data storage area was interrupted, and the update processing of the update data storage area is restarted. When it is started and writing is displayed on the second writing display means, writing to the data area was interrupted, so the process is restarted from the process of copying the updated data in the updated data storage area to the data area. Configure it as follows.

[Industrial application field]

The present invention relates to a data updating method for a storage device used while being connected to a processing device.

As electronic devices become more sophisticated and become more distributed, processing devices such as microprocessors are being used as control devices, and at the same time, devices are being equipped with secondary storage devices for the following reasons. Increasingly, more and more are required.

- Maintain the operating settings of electronic devices and ensure reproducibility of the settings when reusing them.

・Electronic equipment operates under set conditions even when dealing with a large amount of data, and stores bank-up data for that large amount of data.

・Save data when it has an information processing function.

The secondary storage device used here is
A storage device that can retain memory contents, ・EEPROM
, ・Power backup RAM, ・Floppy disk, ・Hard disk, ・Bubble memory, etc.

There is a need for a data update method that can easily restart the system without causing a system down when restarting after processing is interrupted due to, for example, a power outage when updating data in a storage device.

[Conventional technology] FIG. 6 is a diagram illustrating a conventional example.

In FIG. 6, data in the storage device 10A is updated from the processing device 1.

Old data (b) is written in the data area 20 of the storage device 10A, and updated data (a) is written over the old data (b).
) to update the data.

[Problem to be solved by the invention]

In the conventional example described above, when updating written data, the updated data is overwritten in the same area.

Therefore, if writing is interrupted due to power outage, processor abnormality, etc. during updating, for example, if the interruption occurs at point A in FIG. 6, before point A, the updated data (a),
After point A, old data (b) is mixed, and restarting in such a state may cause a system down.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data update method that prevents old and new data from being mixed together when data update of a storage device is interrupted and can be restarted easily.

[Means to solve the problem] FIG. 1 shows a detailed illustration of the invention.

1 in the principle diagram of the present invention shown in FIG. 1 is a processing device,
10 is a storage device, and 20 is a data area.

Further, 30 is an update data storage area provided in the storage device 10 for storing update data, and 40 is a first area that indicates that the update data storage area 30 provided in the storage device 20 is being written.
, and 50 is a second writing display means for displaying that the data area 20 provided in the storage device 20 is being written. The contents of the middle display means 40 and the second writing display means 50 are inspected, and if writing is displayed on the first writing display means 40, the writing to the update data storage area 30 is interrupted. Therefore, the update process is restarted from the update data storage area 30, and when writing is displayed on the second writing display means 50, the update data storage area is This problem is solved by restarting the process of copying the update data of 30 to the data area 20.

[For production]

When updating data stored in the data area 20 of the storage device 10, the updated data is first written to the updated data storage area 30.

During writing, the first writing display means 40 displays that writing is in progress, and when writing is completed, the writing display is stopped.

Next, the update data in the update data storage area 30 is copied to the data area 20.

During copying, the second writing-in-progress display means 50 displays that writing is in progress, and when copying is completed, the writing-in-progress display is stopped.

When restarting after interruption, the displays of the first writing display means 40 and the second write display means 50 are checked, and the first write display means 40 indicates that writing is in progress. Sometimes, writing of update data to the update data storage area 30 is interrupted, so the update data storage area 30 is discarded, the process restarts from writing the update data, and the second writing-in-progress display means 50
When is displaying "Writing in progress", since the writing of update data in the update data storage area 30 to the data area 20 was interrupted, starting from the process of writing update data in the update data storage area 30, It becomes possible to easily restart the system after interruption.

〔Example〕

The gist of the present invention will be specifically explained below with reference to embodiments shown in FIGS. 2 to 5.

FIG. 2 is a diagram explaining details of the present invention, FIG. 3 is a diagram explaining a data update flowchart of an embodiment of the present invention, and FIG.
The figure shows a restoration flowchart of an embodiment of the invention, and FIG. 5 shows a diagram illustrating another embodiment of the invention. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 2 shows an embodiment of the present invention, and the first embodiment explained in FIG.
A first flag writing area 41 and a second flag writing area 51 are allocated in the storage device 10 as the writing-in-progress display means 40 and the second writing-in-progress display means 50.

The update data storage area 30 is composed of an update start address storage area 31, an update end address storage area 32, and an update data storage area 33, and the data area 20 is the same as that described in the conventional example.

The data update process will be explained with reference to the flowchart in FIG.

■ Data update started.

(2) Write a flag "1" in the first flag writing area 41 (hereinafter referred to as update flag).

■Write the update data to the update data storage area 30.

■ Set the update flag "1" to "0".

(2) Write a flag "1" to the second flag write area 51 (hereinafter referred to as data flag).

(2) Copying the update data in the update data storage area 30 to the data area 20.

■ Set the data flag “1” to “0”.

■ Data update completed.

FIG. 4 is a flowchart for restoring the data as it was interrupted for some reason during the data update in FIG.

■ Start restoration.

■ Check update flags and data flags.

■ When the update flag is "1" and the data flag is "0".

■ Discard the data in the update data storage area 30.

■ Set the update flag to "0".

■Restore the state of the update data storage area 30 before writing.

■ When the update flag is "rO" and the data flag is "11".

■ The data in the update data storage area 30 is transferred to the data area 20.
Copy to.

■ Set the data flag to "0".

■ Restore the state after writing updated data to data area 20.

■ Update flag, rl, data flag: When "1". This is a case that does not normally occur and cannot be recovered.

■　Restoration completed.

As described above, the step for restarting is determined based on the states of the update flag and data flag, and the restart can be easily performed.

FIG. 5 shows another embodiment, in which the S-R flip-flop 1 stores update flags and data flags in the storage device 10.
This is an example in which circuits (hereinafter referred to as FF circuits) 42 and 52 are provided, and the operation is the same as in FIGS. 3 and 4.

〔Effect of the invention〕

According to the present invention as described above, it is possible to provide a data updating method that allows easy restart even if an interruption occurs during data updating of a storage device.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the present invention in detail. FIG. 2 is a diagram explaining the present invention in detail. FIG. 3 is a diagram explaining a data update flowchart of an embodiment of the present invention. FIG. 4 is a diagram explaining the present invention. FIG. 5 is a diagram illustrating a restoring flowchart of an embodiment of the present invention, FIG. 5 is a diagram illustrating another embodiment of the present invention, and FIG. 6 is a diagram illustrating a conventional example. In the figure, 1 is a processing device, 10 is a storage device, 20 is a data area, 30 is an update data storage area, 31 is an update start address storage area, 32 is an update end address storage area, 33 is an update data storage area, 40 is a first writing display means, 41 is a first flag write area, 42.52 is a 5-RFF circuit, 50 is a second write display means, 51 is a second flag write area , are shown respectively. Figure 3: To the processing device Figure 3: A diagram explaining a data update flowchart according to an embodiment of the present invention Figure 4: A diagram explaining a restoration flowchart according to an embodiment of the present invention
Diagram to diagram processing device

Claims (3)

[Claims] (1) Regarding a method for updating data in a storage device (10) connected to a processing device (1), updating data is stored in the storage device (10) having a data area (20) for storing data. an update data storage area (30); a first writing display means (40) for displaying that writing is in progress in the update data storage area (30);
0) is currently being written.
), and inspects the contents of the first writing display means (40) and the second write display means (50) at the time of restart after interruption during updating; When writing is displayed on the middle display means (40), the update data storage area (3
0), the process restarts from the update process of the update data storage area (30), and when writing is displayed on the second writing display means (50),
A data updating method characterized in that, since writing to the data area (20) was interrupted, the process restarts from a process of copying update data in the update data storage area (30) to the data area (20). (2) In the storage device (10) having a data area (20) for storing data, an update data storage area (30) for storing updated data, and a message indicating that writing is in progress in the updated data storage area (30) are displayed. The first flag writing area (41) and the data area (2
A second flag writing area (51
), the contents of the first flag write area (41) and the second flag write area (51) are inspected upon restart after interruption during update, and the contents of the first flag write area (41) and the second flag write area (51) are inspected. When writing is displayed in (41), the update data storage area (3) is displayed.
0), the process restarts from the update process of the update data storage area (30), and when writing is displayed in the second flag write area (51),
The storage device is characterized in that, since writing to the data area (20) is interrupted, the process restarts from copying update data in the update data storage area (30) to the data area (20). (3) In the storage device (10) having a data area (20) for storing data, an update data storage area (30) for storing updated data, and a message indicating that writing is in progress in the updated data storage area (30) are displayed. A first memory circuit (42) and a second memory circuit (52) are provided that display the writing in progress of the data area (20), and the first memory circuit (42)
) and the contents of the second storage circuit (52), and if writing is displayed in the first storage circuit (42), the writing to the update data storage area (30) is interrupted. Therefore, when restarting from the update process of the update data storage area (30) and writing in progress is displayed in the second storage circuit (52), if writing is interrupted while writing to the data area (20). Therefore, the update data storage area (3
3. The storage device according to claim 2, wherein the storage device is restarted from the process of copying the update data of 0) to the data area (20).