KR20070091452A - Mobile communication terminal for recovering data in power-off during write operation thereof - Google Patents

Abstract

A mobile communication terminal capable of restoring data in case of power off during a memory writing process is provided to update page information about a write operation by generating a page meta table, thereby easily restoring corresponding data and a corresponding page if power is off during the write operation. A memory(500) includes a page meta table in accordance with the number of plural pages. A controller(600) generates the page meta table in case of a memory write process, and restores data according to a value of the page meta table if power is off during the write process, or controls so that an error checking and compensation function is executed again.

Description

MOBILE COMMUNICATION TERMINAL FOR RECOVERING DATA IN POWER-OFF DURING WRITE OPERATION THEREOF}

1 is a schematic structural diagram of a mobile communication terminal according to an embodiment of the present invention;

2 is a memory structure of the mobile communication terminal of FIG.

FIG. 3 is a detailed configuration diagram of the page meta table of FIG. 2.

4 is a flowchart illustrating a writing method of the mobile communication terminal of FIG. 1.

FIG. 5 is a flow chart illustrating a solution upon power off during the write of FIG. 4. FIG.

*** Explanation of symbols for the main parts of the drawing ***

100: RF unit 200: data processing unit

300: key input unit 400: display unit

500: memory 600: control unit

510: log area 520: page table area

530: data area 540: page meta table

541: backup page area 550: code area

The present invention relates to a mobile communication terminal capable of restoring upon power-off during a memory write. More particularly, the present invention relates to a mobile communication terminal that generates a page meta table and updates page information related to a write. It is a technology that increases memory efficiency by allowing easy recovery.

Generally, a mobile terminal (hereinafter referred to as a 'terminal') refers to a mobile phone, a palm PC, a personal digital assistant (PDA) or a hand-held PC (HPC). It is a high-tech communication device that can perform various tasks through wireless connection as well as network connection regardless.

Such a mobile communication terminal includes a memory such as a NOR (code storage type) memory, a NAND memory, an MMC, a T-Flash, and the like. In particular, NAND memory is composed of pages and blocks. Each block contains 32 pages, and each page includes 512 bytes for a data area, an error correcting code (ECC), and a bad block. It consists of 16 bytes. At this time, the ECC is an area for performing error detection and correction. The ECC stores certain bits of data, detects whether the corresponding data is in error, and stores the result in the ECC area. That is, the write operation is composed of writing of data and writing of error check information.

A mobile communication terminal having such a memory has various problems in the process of writing data. In particular, the mobile communication terminal not only loses the data written at the time of sudden run power-off during the writing by downloading the video or MP3, but also stores the data. Although the area is not a bad block, there is a problem of reducing memory storage efficiency by treating it as a bad block.

An object of the present invention for solving the above problems is to generate a page meta table to easily recover the page and the data when the power off during the write.

According to an aspect of the present invention, a mobile communication terminal capable of recovering at power off during a memory write may include a memory including a page meta table according to a plurality of pages, a page meta table upon memory write, When the power-off occurs during the write, it characterized in that it comprises a control unit for controlling to restore the data or re-perform error check and correction according to the value of the page meta table.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a mobile communication terminal according to an embodiment of the present invention.

The mobile communication terminal according to the present invention includes an RF unit 100, a data processing unit 200, a key input unit 300, a display unit 400, a memory 500, and a control unit 600.

The RF unit 100 receives a signal through the antenna and transmits a signal applied from the data processing unit 200 to the antenna.

The data processor 200 includes a transmitter (not shown) for encoding and modulating a transmitted signal and a receiver (not shown) for demodulating and decoding a received signal. In addition, the data processing unit 200 may be composed of a modem (MODEM) and a codec (CODEC), the codec is a data codec (not shown) for processing packet data, and audio codecs for processing audio signals such as voice (not shown) C) is provided.

The key input unit 300 includes various function keys, numeric keys, special keys, etc., including a power key for turning on and off power and terminating a call. The key input unit 300 is provided to create a text message, a multimedia message, an e-mail, and the like. .

The display unit 400 may be formed of a liquid crystal display (LCD) or the like. The display unit 400 displays all data generated from the mobile communication terminal and displays contents such as text messages, multimedia messages, and e-mails so that the user can check them.

The memory 500 stores various data and program data for driving a terminal. In particular, the memory 500 includes a log area, a page table area, a data area, a page meta table area, and a boot / assemble area as shown in FIG. do. The structure of the memory will be described in detail later with reference to FIG. 2.

The controller 600 controls the overall operation of the mobile communication terminal according to an embodiment of the present invention. In particular, when a sudden power off occurs during writing, the controller 600 checks the page meta table area 540 of the memory 500 so as to recover data or re-execute an error correcting code (ECC). A detailed method for this will be described later with reference to FIGS. 4 and 5.

2 illustrates a structure of the memory 500 of the mobile communication terminal of FIG. 1.

Referring to FIG. 2, the memory 500 uses a total of 32 MB of NAND flash memory, for example, a log area 510, a page table area 520, a data area 530, a page meta table area 540, and a code area. 550.

In this case, the log area 510, the page table area 520, and the data area 530 correspond to a storage area, and the log area 510 is composed of 8 blocks to store information such as data write time and size. The page table area 520 is composed of 29 blocks to store information such as data storage size of each page, and the data area 530 is composed of 731 blocks to store downloaded data.

In addition, the code area 550 is composed of 992 blocks, that is, 15.5 MB, and includes information such as a boot loader and a main code.

The page meta table area 540 includes a backup page area 541 and a page meta table as shown in FIG. 3. The backup page area 541 is an area temporarily stored when data is written, and the data of the backup page area 541 may be read and stored in the storage area when the power is turned off during the later write.

The page meta table 542 includes page data write check bits, page ECC write check bits, file start / end check bits, and page backup write check bits, as shown in FIG. The page meta table area 540 includes page data write check bits for each page, page ECC write check bits, file start / end check bits, and page backup write check bits.

At this time, the upper first page data write check bit is set to "1" before writing to the data area of 512 bytes and to "0" when writing is completed. The upper second bit, the page ECC write check bit, is set to "1" before ECC execution and to "0" when ECC execution is completed. Also, the upper third bit, the file start / end check bit, is set to "1" when opening a file and writing the first page, and continuously set to "0" when writing the second, third, etc. pages and writing the last page. Is set back to "1".

Hereinafter, a method of generating the page meta table 542 of the present invention and a solution upon powering off during a write will be described in detail with reference to FIGS. 4 and 5.

First, FIG. 4 is a flowchart illustrating a method of generating a write-time page meta table 542 of the mobile communication terminal of FIG. 1.

At the time of writing, the page backup write check bit of the page meta table 542 is set to "1" (S101), and the corresponding data is written to the backup page area 541 (S102). At this time, the data is stored in the data area 530, the page table area 520, and the log area 510 of the storage area. That is, the content of the downloaded data is stored in the data area 530, information about the page where the data is stored is stored in the page table area 520, and log file information such as download start time and end time is stored in the log area ( 510, respectively.

After writing the corresponding data in the backup page area 541, the page backup write check bit is set to "0" and the page data write check bit is set to "1" (S103). The data is written (S104).

Thereafter, when data writing to the storage area is completed, the page data write check bit is set to "0", and the page ECC write check bit is set to "1" for error checking (S105).

Subsequently, ECC is performed (S106), and when ECC is completed, the page ECC write check bit is set to "0" (S107).

The present invention creates and updates the page meta table 542 at write time as described above.

On the other hand, if a sudden power off occurs while performing the write as described above, it solves as shown in FIG.

That is, if a power off occurs during writing (S201), the upper two bits (page data write check bit and page ECC write check bit) of the page meta table 542 are checked (S202).

As a result of the check in step S202, if the page data write check bit is "1" (S204), the data of the backup page area 541 is recovered and stored in the storage area (S204). On the other hand, if the page data write check bit is "0", it is checked whether the page ECC write check bit is "1" (S205). If the page ECC write check bit is "1", ECC is performed again (S206) and the page ECC is checked. If the write check bit is "0", the corresponding page meta table 542 is searched to check whether the information is the last information among the plurality of pages stored in the corresponding page meta table (S207).

That is, it is determined whether the information is about which page among a plurality of pages of information stored in the page meta table. If the recovered data is the data of the last page, the process is terminated. Repeat

For example, if one file is downloaded, if the file is stored in three pages (512 * 3 = 1536 Kbytes), perform the steps S202 to S206 for the first page to recover the corresponding data, and for the second page. By performing the steps S202 to S206 to restore the corresponding data and performing the steps S202 to S206 on the third (last) page to restore the corresponding data, all three pages are restored.

As described above, the present invention generates a page meta table 542 that is symmetrical to the physical page of each NAND flash memory, and writes the state of the page to the page meta table 542 every time a page is written, so that power off is achieved. If so, restore only the page in question.

Therefore, when a power-off occurs during a write, the memory area related to the write operation is not treated as a bad block.

As described above, the present invention generates a page meta table so that the data can be easily recovered when the power is turned off during writing so that the memory area related to the write operation is not processed as a bad block, thereby providing memory efficiency. There is an effect to increase.

In addition, a preferred embodiment of the present invention is for the purpose of illustration, those skilled in the art will be able to various modifications, changes, replacements and additions through the spirit and scope of the appended claims, such modifications and changes are the following claims It should be seen as belonging to a range.

Claims (7)

A memory including a page meta table according to a plurality of pages; And And a controller configured to generate the page meta table when the memory is written, and to control data recovery or error checking and correction according to a value of the page meta table when a power off occurs during the writing. Mobile communication terminal, characterized in that. The method of claim 1, wherein the memory, A log area including log information, a page table area including a plurality of page information, a data area to which data is written, the page meta table area, and a boot / assembly area including boot information Communication terminal. The method of claim 2, wherein the page meta table area, And a backup page area temporarily stored when writing the page meta table and data. The method of claim 1, wherein the page meta table, A page data write check bit indicating whether data is being written to the data area, a page error correcting code (ECC) write check bit indicating whether ECC is being performed, a file start and end check bit, and a page backup write check bit. Mobile communication terminal. The method of claim 4, wherein the control unit, When a power off occurs during the memory write, the value of the page data write check bit is checked, and according to the result, it is determined whether the power off occurs while writing data to a page area. . The method of claim 5, wherein the control unit, If the page data write check bit is "1", it is determined that the power-off has occurred while writing data, and the data of the backup page area is recovered and stored in the data area, and the page data write check bit is "0". And checks the page ECC write check bit to perform the ECC again. The method of claim 6, wherein the control unit, And if the page ECC write check bit is "1", re-execute the ECC, and if the page ECC write check bit is "0", determine whether the page is the last page.

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