KR19980026498A - Record information recovery apparatus and method for rewritable nonvolatile memory - Google Patents

Abstract

The present invention relates to an apparatus and method for recovering write information of a rewritable nonvolatile memory, including a digital signal processor and a memory interface device, and a rewritable nonvolatile memory. Information about where it has been written is obtained from an index in memory and processed according to this information to allow the system to operate normally.

Description

Recovery System and Method of Record Information of Re-writable Nonvolatile Memory

The present invention relates to an apparatus and method for recovering write information of a rewritable nonvolatile memory, and more particularly, to stop supplying a power supply voltage in a situation in which writing or erasing of a rewritable nonvolatile memory is not completed. Is supplied again, the present invention relates to an apparatus and a method for finding and recovering record information.

Generally, memory devices with defective cells cannot be used, but may be used for specific applications, such as answering machines or recorders.

Early answering machines or recorders used tape. This approach has the problem of using a tape transfer mechanism that must be assembled and applied during manufacturing. There is also a need for a head for reading, writing, and erasing data to tape, and an electrical circuit for giving and reproducing the appropriate signal to the head. In addition, a large amount of power is consumed because a motor must be used to advance the tape. Thus, instead of the tape method, a method of quantizing a message signal and storing the message signal in a semiconductor memory is used.

At this time, as a semiconductor memory device used, a defective RAM is used in place of a relatively expensive DRAM and an SRAM. A defective RAM refers to a RAM with poor timing characteristics or a certain percentage of abnormal memory cells. Such RAM is cheaper than the DRAM and SRAM.

In order to use the defective RAM as a memory for storing audio information, the following scheme is used. Quantize the audio signal and store it as it is or compress and store it in the shape of the waveform to recognize the loss of information that the human ear does not feel, and to extract only the specific variable from the audio signal and store only the variable value. This is a mapping scheme that avoids and stores these places.

In the case of using the RAM, because of the volatile characteristics of the RAM, it requires a backup battery in case the power supply is cut off, so the cost of this is expensive. However, with the development of semiconductor technology, a recordable nonvolatile memory has been developed, and cost reduction effects can be expected because an auxiliary power supply is not required. In addition, the price for nonvolatile memory itself continues to fall.

In a device using a rewritable nonvolatile memory, if the power supply is interrupted and supplied again while recording information into the rewritable nonvolatile memory, the recording operation is started again after deleting the already recorded information. Should be. However, when the supply of the power supply voltage is interrupted and supplied again, the information on how far the rewritable nonvolatile memory has been recorded or deleted disappears. Therefore, when the supply of the power supply voltage is resumed, there are problems such as writing in an already recorded place or deleting existing data, thereby causing an error in the entire system operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for finding information on writing or erasing data and completely recovering the recording information when the supply of the power supply voltage is interrupted and then supplied again. .

1 is a block diagram of a recording information recovery apparatus according to the present invention;

Fig. 2 is a flowchart showing a read operation of the recording information recovery device in a normal power supply state.

Fig. 3 is a flowchart showing a writing operation of the recording information recovery apparatus in a normal power supply state.

Fig. 4 is a flowchart showing the erasing operation of the recording information recovery apparatus in the normal power supply state.

Fig. 5 is a memory map of a rewritable nonvolatile memory of the record information recovery apparatus.

FIG. 6 is a memory map of a first index and a second index area of a rewritable nonvolatile memory of FIG. 5; FIG.

7 is a flowchart illustrating a method of recovering recording information when a power supply voltage is cut off and then supplied again according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

100: digital signal processor 200: memory interface device

300: rewritable nonvolatile memory 310: first permanent information table

320: first index 330: second index

340: Copy block 350: data area

360: second permanent information table 321: index data

322: end of data 323: write start flag

324: Write end flag 325: Data number

According to a feature of the present invention proposed to achieve the above object, in a recording apparatus using a rewritable nonvolatile memory as a data storage medium, the rewritable nonvolatile memory includes an index area and a data area, Save the data. The digital signal processor provides predetermined signals and data for reading, writing, and erasing the nonvolatile memory, and recovers write information by reading the index area when power supply voltage is resumed. The memory interface device transfers all commands received from the digital signal processor to the rewritable nonvolatile memory, detects an operation state of the rewritable nonvolatile memory as a predetermined signal, and transmits the command to the digital signal processor.

According to another aspect of the invention, there is provided a rewritable nonvolatile memory including an index area and a data area and storing data for each, and predetermined signals and data for reading, writing, and erasing the rewritable nonvolatile memory. A digital signal processor that reads the index area to recover recording information, and transfers all commands received from the digital signal processor to the rewritable nonvolatile memory, and rewrites the signal to a predetermined signal. A method of recovering record information of a rewritable nonvolatile memory record information recovering apparatus including a memory interface device for detecting a signal and transmitting the same to a digital signal processor may include: writing or erasing a data area and completing index data of the first index. The modified index data 1) determining whether a record of the first index was being deleted after being recorded in the second index; For the case where it is determined as an example in step 1), step 2) of swapping settings of the first index and the second index; 3) deleting the record of the second index after this 2) step; In the case where NO is determined in step 1), the writing or erasing operation is completed in the data area, and after the index data and the modified index data of the second index are written to the first index, the recording of the second index is deleted. 4) determining whether it was in progress; 5) in the case where it is determined as an example in step 4) that the setting of the first index and the second index is incorrect, deleting and ending the recording of the second index; 6) in the case where it is determined as NO in step 4) that only the writing or erasing operation is performed in the data area, and that the setting of the first index and the second index is incorrect; For the case where it is determined as an example in step 6), step 7) of changing the setting of the first index and the second index; 8) determining whether a number is present in the data number after step 7); For the case where it is determined as an example in step 8), step 9) deleting data corresponding to the data number from the data area based on the first index; 10) for deleting the data from the data area after the last data recorded based on the first index for the case where NO is determined in step 8); 11) deleting and ending recording of the second index after steps 9) and 10); 12) determining whether or not a write or erase operation has been performed in the data area only in the case where NO is determined in step 6); For the case where it is determined as an example in step 12), step 13) for recovering the record information according to whether or not there is a data number as in step 8) and 11); In the case where NO is determined in step 12), is the writing or erasing operation completed in the data area, and the index data and the modified index data of the first index have been recorded in the second index, and have the records of the first index deleted? Determining 14); 15) for the case where it is determined as an example in step 14) that the settings of the first index and the second index are changed and finished; If it is determined as NO in step 14), since there is no write or erase operation, no recovery operation is required.

1 is a block diagram of a recording information recovery apparatus according to the present invention.

Referring to FIG. 1, an apparatus for recovering a recording information is a device capable of storing and reproducing a compressed audio signal. The digital signal processor (DSP) 100 and the memory interface unit (MIU) 200 are provided. And a rewritable nonvolatile memory 300.

The rewritable nonvolatile memory 300 is a flash EEPROM.

Hereinafter, the flash memory (F.M) 300 will be referred to.

Information exchange between the digital signal processor 100 and the memory interface device 200 is performed through an external data bus (EXT) [15: 0], and the digital signal processor 100 flashes through an external data bus. The address and data of the memory 300 are sent to the memory interface device 200.

The address and data of the flash memory 300 are distinguished by decoding EA [2: 0] in the memory interface device 200. The four flash memories 300 shown in FIG. 1 are four megabit (Mbit) storage devices, and since there are 4,193,304 storage locations, respectively, the digital signal processor 100 stores the lower address and the upper address twice in a memory interface device. Will be sent to (200). The distinction between these two addresses is also made through EA [2: 0]. In addition, signals for controlling the signal flow between the digital signal processor 100 and the memory interface device 200 are read / write (R / WB), erase (ESB), ready (READY), and interrupt (INT). There is this.

Information exchange between the memory interface device 200 and the flash memory 300 is performed through 8-bit data lines I / O [7: 0], and the memory interface device 200 writes, reads, and erases data. Commands, addresses, and data are sent to the flash memory 300 through these data lines as control signals for performing. In addition, as a signal for controlling the signal flow between the memory interface device 200 and the flash memory 300, chip enable (CEB), command latch enable (CLE), and address latch enable (Address Latch Enable; ALE), Write Enable (WEB), Read Enable (REB), Ready / Busy (RBB), and the like.

2 shows a process in which the information recovery device performs a read operation in a normal power supply state.

Referring to FIG. 2, the digital signal processor 100 sets the read mode of the flash memory 300 and gives a lower address and an upper address to the memory interface device 200, whereby a read operation is started (S400). At this time, the memory interface device 200 disables the READY signal (S404) until the memory interface device 200 reads data from the flash memory 300 to complete the digital signal processor 100. ) To prevent access to the memory interface device 200 (S402).

The memory interface device 200 issues a read command to the flash memory 300 according to a read mode set by the digital signal processor 100 (S406), and actually flash memory from an address received from the digital signal processor 100. The address of 300 is given to the flash memory 300 (S408). Then, the ready / standby signal of the flash memory 300 is set to a low state, and the flash memory 300 performs a read operation (S410).

When the read operation of the flash memory 300 is completed (S412), the ready / standby signal of the flash memory 300 is in a high state, and the memory interface device 200, which has sensed the signal, has a 16-bit value. In order to read data, 8-bit data is read from the flash memory 300 twice (S414).

When the operation is completed (S416), the memory interface device 200 turns on the ready signal to enable the digital signal processor 100 to access the memory interface device 200 (S418), and detects the ready signal. The digital signal processor 100 reads 16-bit data from the memory interface device 200 (S420). When the digital signal processor 100 reads data from the memory interface device 200, the memory interface device 200 increases the address by one and then reads the next 16-bit data from the flash memory 300 (S422).

3 shows a process in which the information recovery apparatus performs a write operation in a normal power supply state.

Referring to FIG. 3, when the digital signal processor 100 sets the write mode of the flash memory 300 and gives a lower address and an upper address to the memory interface device 200, a write operation is started (S500). . At this time, the memory interface device 200 disables the ready signal (S504) until the digital signal processor 100 is ready until the memory interface device 200 completes the preparation for writing data to the flash memory 300. The memory interface device 200 may not be accessed (S502).

The digital signal processor 100 gives a write mode to the memory interface device 200 (S506), and the memory interface device 200 writes a command to the flash memory 300 in a write mode set by the digital signal processor 100. And the address of the actual flash memory 300 to the flash memory 300 from the address received from the digital signal processor 100 (S508). When the operation is completed, the memory interface device 200 turns on the ready signal to enable the digital signal processor 100 to access the memory interface device 200 and detects the ready signal. ) Transmits 16-bit data to be written to the memory interface device 200 (S510). Then, the memory interface device 200 disables the ready signal, sends the 16-bit data to the flash memory 300, and then enables the ready signal so that the digital signal processor 100 operates the memory interface device 200. Make it accessible (S512).

If the digital signal processor 100 wants to write more data, the above operation is repeated (S514). Otherwise, the write end mode of the flash memory 300 is set (S516).

When the write end mode is set, the memory interface device 200 disables the ready signal and gives a program command to the flash memory 300 (S518). The flash memory 300 sets the ready / standby signal to a low state. The 16-bit data received so far is programmed into an actual storage location (S520).

When the program is completed, the flash memory 300 makes the ready / standby signal high, and the memory interface device 200 which has sensed this is enabled with the ready signal ready for the digital signal processor 100 to perform the next operation. (S522).

4 shows a process in which the information recovery apparatus performs an erase operation in a normal power supply state.

Referring to FIG. 4, an erase operation is started by setting the erase mode of the flash memory 300 and giving an upper address to the memory interface device 200 by the digital signal processor 100 (S600). At this time, the memory interface device 200 disables the ready signal (S604) until the digital signal processor 100 completes the operation of erasing data of the flash memory 300 by the memory interface device 200. Prevent access to the device 200 (S602).

The memory interface device 200 issues an erase command to the flash memory 300 in an erase mode set by the digital signal processor 100 (S606), and actually flashes the flash memory 300 from an address received from the digital signal processor 100. Is given to the flash memory 300 (S608). Then, the flash memory 300 sets the ready / standby signal to a low state and erases the information of the flash memory 300 at a corresponding address in block units (S610).

When the erase operation is completed, the flash memory 300 sets the ready / standby signal to a high state (S614), and the memory interface device 200, which has sensed this, knows that the erase operation is completed and is ready to notify the digital signal processor 100. Enable the signal (S616).

Hereinafter, an operation of the recording apparatus using the rewritable nonvolatile memory 300 divided into an index area and a data area will be described with reference to FIGS. 5 and 6.

5 is a memory map of a rewritable nonvolatile memory of the recording information recovery apparatus.

FIG. 6 is a memory map of the first and second index regions of the rewritable nonvolatile memory of FIG. 5.

First, to change the contents of the index area as one of the operations of the device, the following procedure is performed.

First, a first index 320 having all information about a previous index is found. Then, the writing start flag (WSF) 323 information is recorded at a specific address of the second index 330 in which no data is written. Then, all data up to the address of the first index 320 to be modified are moved to the second index 330. Since the addresses in all blocks are the same, modifying index data relating to the data of the address to be modified in the first index 320 is written to the address of the second index 330, and the second index ( Move all data before the address to which checksum data of 330 is to be written to the second index 330, and then checkmark and end of data (EOD) 322 to the second index 330. Record it. Then, all data of the first index 320 is erased, and writing end flag (WEF) 324 information is recorded at a specific address of the first index 320.

As another operation of the apparatus, the following procedure is used to write data to the erased data area (DA) 350. First, the first index 320 is found. The first index 320 has all the information about the previous index and no data is written in the second index 330. After the first index 320 is found, the write start flag 323 information is recorded at a specific address of the second index 330. Then, actual data is recorded in the data area 350. After writing, all data up to the address to be modified in the first index 320 is moved to the second index 330. Since the addresses in all blocks are the same, the modified index data relating to the data of the address to be modified of the first index 320 is written to the address of the second index 330, and the checksum of the second index 330 is After moving all the data before the address where the data is to be written to the second index 330, the checksum and the data end 322 are written to the second index 330. Then, all data of the first index 320 is erased and the write end flag 324 information is recorded at a specific address of the second index 330.

As another operation of the apparatus, the following order is performed to perform data movement in the data area 350. First, the first index 320 is found. The first index 320 has all the information about the previous index and no data is written in the second index 330. After finding the first index 320, the write start flag 323 information and the data number (DNB) 325 of the data to be moved are recorded at a specific address of the second index 330. Data is moved in the data area 350 using a copy block (CBL) 340. When the movement is completed, all data up to the address of the first index 320 to be modified are moved to the second index 330. Since the addresses in all blocks are the same, the modified data relating to the data of the address to be modified of the first index 320 is written to the address of the second index 330 and the checksum data of the second index 330 is After moving all the data before the address to be recorded to the second index 330, the checksum and the data end 322 are written to the second index 330. Then, all data of the first index 320 is erased and the write end flag 324 information is recorded at a specific address of the second index 330.

The present invention relates to an apparatus and method for recovering record information of a rewritable nonvolatile memory, including a digital signal processor, a memory interface device, and a flash memory, where a power supply voltage is interrupted and supplied again, wherever the flash memory is recorded. By obtaining the information on whether or not the information from the index in the flash memory and processing according to this information, it is possible to recover the record information for the normal operation of the system.

Example

Hereinafter, embodiments of the present invention will be described in detail with reference to Tables 1 and 2, and FIG.

The flash memory 300 includes first and second permanent information tables (PITs) 310 and 360, first and second indexes 320 and 330, and a copy block ( Copy BLock (CBL) 340 and a data area (DA) 350.

The first permanent information table 310 has information defined at system initialization. The first index 320 has information indicating the start and end of previous data. The second index 330 is alternately used with the first index 320 to minimize the unnecessary data movement of the flash memory 300 to reduce the number of writing or erasing, and the first index 320 in every block. ) Has the same address. The copy block 340 is used as a temporary data storage when data is modified. The data area 350 stores data received from the digital signal processor 100. The second permanent information table 360 is a copy of the first permanent information table 310 and has characteristic data distinguished from the bad block or the first permanent information table 310.

The first index 320 and the second index 330 areas are index data 321 in which index data and modified index data are written, and start information is written when data is written in the data area 350. Data in the write start flag (WSF) 323 area, the data end (EOD) 322 area to be written after all of the index data has been written in the index data 321 area, and the data area 350. A write end flag (WEF) 324 area into which the information which has finished writing the data is entered, and a data number (DNB) 325 area indicating the number of data to be transferred.

The first index 320 and the second index 320 of the flash memory 300 are interrupted when the supply voltage is stopped during the three operations of the recording apparatus using the rewritable nonvolatile memory 300 divided into an index area and a data area. The data end 322, the write start flag 323, the write end flag 324, and the data number 325 of the index 330 are in the state shown in Table 1 below.

Possible state First index 2nd index A B EOD WSF WEF DNB EOD WSF WEF DNB One One 0 0 0 X One One One X 0 7 2 One 0 0 0 X One 0 One N / F 0 5 3 One 0 0 0 X 0 0 One X 0 One 2 One 0 0 X 0 0 One X 4 One 3 One One 0 X 0 0 One X 6 One 4 One One One X 0 0 One X 7 One 5 One One One X 0 0 One X 7 One 4 One One One One X 0 0 0 X 7 0

At this time, the possible states that can be separated into the first index 320 and the second index 330 are largely divided into four types, and the data ends 322 among the regions in the first index 320 and the second index 330. ), The values obtained by allocating one bit for each of the write start flag 323 and the write end flag 324 are indicated as A and B on the right side of Table 1, respectively. A is the value of the three bits for the first index 320 and B is the value of the three bits for the second index 330. If the data number 325 is 0 or a positive number, the symbol N is used. If the read values are all high, that is, F is represented by -1 in the number of two's complement representations, F is used. 't care) is denoted by X.

The first state 1-1 is a state in which there is no write or erase operation in the data area 350, and the second state 2-1 is a state in which a write or erase operation is performed in the data area 350. FIG. In the third state (3-1,3-2,3-3,3-4,3-5), the write or erase operation is completed and the index data of the first index 320 and the modified index data are second. The state recorded in the index data 330 is shown. In the fourth state 4-1, the write or erase operation is completed in the data area 350, the index data of the first index 320 and the modified index data are written in the second index 330, and the first index 4. This indicates a state in which all of the write or erase operations are completed, including the state in which the recording of the index 320 is deleted.

When the device is powered back on, the information should be recovered based on the conditions in Table 1. The information recovery method can be classified by assuming that the states shown in Table 1 are six again, and the record information recovery process can be performed for each.

Table 2 shows six possible assumptions based on the state of Table 1.

7 shows a flowchart for performing a recovery operation based on Table 2. FIG. A process of determining the first index 320 and the second index 330 and performing record information recovery processing for each step is shown.

First, as in case 1, when a value obtained by assigning one bit to the data end 322, the write start flag 323, and the write end flag 324 for the second index 330 is 1, that is, B = 1. In the case where the determination is made (S10), since the writing or erasing operation is completed in the data area 350, the index data and the modified index data of the first index 320 are recorded in the second index 330. The first index 320 and the second index 330 are exchanged with each other (S12), and the second index 330 is deleted (S14).

Occation A B DNB One X One X 2 One X X 3 5 0 N / F 4 0 5 N / F 5 7 0 X 6 0 7 X

If the determination result of step S10 is not B = 1, it is determined whether A = 1 as in case 2 (S20).

If the determination result of step S20 is A = 1, the assumption of the first index 320 and the second index 330 is incorrect, and the writing or erasing operation is completed in the data area 350 and the first index 320 is completed. It is reported that the index data and the modified index data of the second index 330 were recorded, and the step of swapping the first index 320 and the second index 330 was reported. Delete (S14).

If the determination result of step S20 is not A = 1, it is determined whether A = 5 as in case 3 (S30).

If the determination result of step S30 is A = 5, the assumption of the first index 320 and the second index 330 is wrong, and the writing or erasing operation is performed in the data area 350 and the first index ( 320 and the second index 330 are exchanged with each other (S32). At this time, the presence or absence of the data number 325 is determined (S34), and if there is a number (symbol N), it is again based on the first index 320. In order to store the new data, the existing incomplete corresponding data is deleted (S36) and the second index 330 is deleted (S38), and if the number is not included in the data number 325 (symbol F), the first index 320 The data area 350 is deleted after the last recorded data (S35) and the second index 330 area is deleted (S38).

If the determination result of step S30 is not A = 5, it is determined whether B = 5 as in case 4 (S40).

If the determination result of step S40 is B = 5, in this case, the writing or erasing operation is performed in the data area 350, and as in the case of A = 5, the data number S325 is determined (S34) and the same recovery is performed. The processing steps S35, S36, S38 are performed.

If the determination result of step S40 is not B = 5, it is determined whether A = 7 as in case 5 (S50).

If the determination result of step S50 is A = 7, in this case, the writing or erasing operation is completed in the data area 350, and the index data and the modified index data of the first index 320 are converted into the second index 330. In the case where the record of the first index 320 is deleted, the settings of the second index 330 are interchanged (S52).

If the determination result of step S50 is not A = 7, since the write or erase operation is not performed in the case of B = 7 as in case 6, no recovery operation is required, and thus the process ends.

The present invention finds and recovers record information of a rewritable nonvolatile memory when the power supply voltage is interrupted and then supplied again, thereby recording the previously recorded data or deleting the recorded data. There is an effect to solve the problem causing the error.

Claims (7)

A recording apparatus using a rewritable nonvolatile memory as a data storage medium, A rewritable nonvolatile memory 300 including an index area and a data area; A digital signal processor (100) which provides predetermined signals and data for reading, writing, and erasing to the rewritable nonvolatile memory (300), and reads the index area and restores recording information when power supply voltage is restarted; All commands received from the digital signal processor 100 are transferred to the rewritable nonvolatile memory 300, and the digital signal processor 100 detects an operation state of the nonvolatile memory 300 rewritable with a predetermined signal. And a memory interface device (200) for transmitting to the rewritable nonvolatile memory record information recovery device. The method of claim 1, And rewritable nonvolatile memory (300) is a flash EEPROM. The method according to any one of claims 1 and 2, The rewritable nonvolatile memory 300 includes: a first permanent information table 310 in which initial information such as bad block information is stored; A first index 320 having information indicative of the start and end of previous data; In order to minimize unnecessary data movement of the nonvolatile memory 300 and to reduce the number of writing or erasing, the first index 320 is alternately used, and the first address 320 has the same address as the first index 320 in every block. 2 index 330; A copy block 340 which is used as a temporary data storage place when modifying data; A data area 350 in which data received from the digital signal processor 100 is stored; A rewritable nonvolatile memory, characterized in that it comprises a second permanent information table 360 having copies of the first permanent information table 310 and having characteristic data distinguished from the bad blocks or the first permanent information table 310. Record information recovery device. The method of claim 3, wherein The first index 320 and the second index 330 areas include an index data area 321 in which index data and modified index data are written; A write start flag (323) area in which start information is written when data is written into the data area (350); An end-of-data area 322 which is written after all of the index data has been written in the index data area 321; An end-of-write flag (324) area in which information which has finished writing data in said data area is placed; And a data number (325) area indicating the number of data to be transferred. A rewritable nonvolatile memory 300 including an index area and a data area, and a predetermined signal and data for reading, writing, and erasing the rewritable nonvolatile memory 300, and reading the index area. A digital signal processor 100 for restoring recording information, and a nonvolatile memory 300 capable of transferring all commands received from the digital signal processor 100 to the rewritable nonvolatile memory 300 and rewriting with a predetermined signal. In the record information recovery method of the rewritable nonvolatile memory record information recovery device comprising a memory interface device 200 for detecting the operation state of the operation and transmits it to the digital signal processor 100, After the writing or erasing operation is completed in the data area 350 and the index data of the first index 320 and the modified index data are recorded in the second index 330, the recording of the first index 320 is deleted. Determining whether it is being performed (S10); In the case where it is determined as an example in the step S10, the step of changing the setting of the first index 320 and the second index 330 (S12); Deleting the record of the second index (330) after the step S12 (S14); In the case where it is determined as NO in step S10, after the writing or erasing operation is completed in the data area 350, the index data of the second index 330 and the modified index data are recorded in the first index 320. Determining whether the record of the second index 330 is being deleted (S20); In the case where it is determined as an example in the step S20, since the setting of the first index 320 and the second index 330 is different, the step of deleting and ending the recording of the second index 330 (S14); In the case where it is determined as NO in step S20, it is only a state in which the writing or erasing operation is performed in the data area 350, and it is determined whether the setting of the first index 320 and the second index 330 is wrong. Step S30; In the case where it is determined as an example in the step S30, the step of changing the setting of the first index 320 and the second index 330 (S32); Determining whether there is a number in the data number 325 after the step S32; In the case where it is determined as an example in step S34, deleting data corresponding to the data number 325 from the data area 350 based on the first index 320 (S35); If it is determined as NO in step S34, deleting data from the data area 350 after the last data recorded based on the first index 320 (S36); Deleting the recording of the second index (330) after the steps S35 and S36 and ending (S38); If it is determined as NO in step S30, determining whether or not a write or erase operation has been performed in the data area 350 (S40); For the case where it is determined as an example in the step S40, recovering the record information according to whether or not there is a data number as in step 8) and 11) (S34, S35, S36, S38); In the case where NO is determined in step S40, the writing or erasing operation is completed in the data area 350, and the index data and the modified index data of the first index 320 are recorded in the second index 330. Determining whether the record of the first index 320 has been deleted (S50); In the case where it is determined as an example in the step S50, the step of changing the settings of the first index 320 and the second index 330 and ending (S52); And in the case where it is determined as NO in step S50, there is no write or erase operation, and thus no recovery operation is required. The method of claim 5, The method of restoring recording information of the rewritable nonvolatile memory record information recovering apparatus may include index data of the first index 320 when both write and erase operations are completed in the data area 350 of the rewritable nonvolatile memory 300. The modified index data is recorded in the second index 330, the recording of the first index 320 is deleted, and the second index 330 is set to the first index 320 again. A method of recovering rewritable nonvolatile memory record information. The method of claim 5, The data end region 322, the write start flag region 323, and the write end flag region 324 of the first index 320 and the second index 330 of the nonvolatile memory 300, respectively. When you allocate one bit, In step S10, for the second index 330, the data end 322 and the write start flag 323 are logical 0, the write end flag 324 is logical 1, and for the first index 320. When all three values start from logic 0, the data ends 322, write start flag 323, and write end flag 324 in order to be logical 1, and the value of the second index 330 is 1 Determining authorization; Step S20 is a step of determining whether the value of the first index 320 is 1; In step S30, all three values compared with respect to the second index 330 are logical zeros. For the first index 320, the logic of the write start flag 323 is zero, the data end 322 and the write end. If the logic of the flag 324 is 1, it is the step of determining whether the value of the first index is 5; Step S40 is a step of determining whether the value of the second index 330 is five; In step S50, when all three values to be compared are detected as logical 0s for the second index 330 and all logical 1s for the first index 320, it is determined whether the value of the first index is 7. And recovering the rewritable nonvolatile memory record information.