JP2008140474A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive unit which can ensure the reliability of control data stored in a NAND flash memory by a simple control method. <P>SOLUTION: The optical disk drive unit comprises a CPU 2 for controlling the unit, a RAM 3 including a working area for the CPU 2 and a storage area for the control data for controlling the unit, a DVD-ECC section 5 corresponding to a DVD format standard, and the NAND flash memory 7 for storing the control data for controlling the unit. The DVD-ECC section 5 carries out the error correction and the error correction encoding of the control data based on the DVD format standard. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disk drive device that conforms to the DVD standard, and more particularly, to storage of control data for controlling an optical disk drive device in a NAND flash memory.

  Conventionally, in an electronic device such as an optical disk drive device, there is a possibility that control data (firmware data) for controlling the device is rewritten by downloading or the like. For this reason, in many electronic devices, control data is stored in a NOR flash memory or a NAND flash memory, which is a kind of nonvolatile memory, so that the control data can be rewritten after shipment. This control data includes a control program, a control code, a data table, and the like.

  The NOR flash memory has higher data reliability than the NAND flash memory, but is inferior in terms of integration and expensive. Therefore, in order to reduce costs, there is an electronic device that employs a NAND flash memory that is excellent in integration into a semiconductor integrated circuit and is inexpensive (see Non-Patent Document 1).

FIG. 10 is a diagram showing a configuration of the NAND flash memory.
The NAND flash memory 101 is composed of basic units called pages 102, and data is written and read in units of pages. One page includes a data area 104 and a redundant area 105.

  In the NAND flash memory 101, data is erased in an erase unit of a block 103. Therefore, by designating one block by the erase command, a plurality of pages constituting one block are erased.

  NAND flash memory includes a large block product and a small block product depending on the total memory capacity. In the small block product, one page is 528 bytes, the data area in the page is 512 bytes, and the redundant area in the page is 16 bytes. One block is composed of 32 pages. In the large block product, one page is 2112 bytes, the data area in the page is 2048 bytes, and the redundant area in the page is 64 bytes. One block is composed of 64 pages.

  In the NAND flash memory 101, an unusable block unit area called a structurally defective block is defined. The defective block includes a congenital defective block that is a defect from the semiconductor manufacturing stage and an acquired defective block that is generated by repeated operations of the erase, write, and read cycles thereafter. However, the top block of the memory is always guaranteed to be a good block.

  The NAND flash memory configured as described above has a property that error bits are likely to occur when data is written. For this reason, when data is stored in the NAND flash memory, error correction means and error correction coding means dedicated to the NAND flash memory are required. Therefore, when the control data is written in the NAND flash memory, the error correction encoding unit generates an error correction code (parity). The generated parity is written into a redundant byte portion (redundant area 105 in FIG. 10) in the NAND flash memory. When data is read, the data corresponding to the accessed address and its redundant bytes are read, and the error correction means performs error correction processing on the control data.

However, the error correction code defined in the NAND flash memory has a low error correction capability. For this reason, in order to ensure the reliability of the control data, an error that occurs in the NAND flash memory is detected, and if the error cannot be corrected, data that does not have an error is acquired via an external memory or a network. Electronic devices have been proposed (see Patent Document 1).
Japanese Patent Laying-Open No. 2004-318465 (page 10, FIG. 1) Kazuo Oda, “Basic Usage of NAND Flash Memory”, Interface, CQ Publisher, March 2006, p.52-61

  Conventionally, some electronic devices such as an optical disk drive device employ a NOR type flash memory for storing control data for controlling the device, but the NOR type flash memory is inferior in the degree of integration in a semiconductor integrated circuit and is expensive. Therefore, there was a problem that cost reduction was difficult.

  On the other hand, if a NAND flash memory is used for storing control data, the reliability of the data is low. Therefore, it is necessary for the CPU to mount error correction means and error correction coding means dedicated to the NAND flash memory as a semiconductor integrated circuit. There is a problem that cost reduction is limited.

  In addition, an error correction code defined in the NAND flash memory has a low error correction capability. For example, in the smart media standard or xD picture card standard, which is one of the removable memory card standards used for digital cameras and the like, a 1-bit error is generated in a 256-byte data area which is a calculation unit of error correction coding. It has only correction capability and 2-bit error detection capability. For this reason, the NAND flash memory is insufficient for storing control data in a field where highly reliable data is required, such as an optical disk drive. Therefore, NAND type flash memory requires a complicated means and control processing such as acquiring correct control data from an external communication line or the like when an error exceeding the error correction capability occurs when storing control data. There is.

  Therefore, an object of the present invention is to provide an optical disk drive device that stores highly reliable control data in an inexpensive NAND flash memory by a simple control method.

  The present invention relates to an optical disk drive device that reads data from an optical disk, a CPU that controls the optical disk drive device, a ROM storage unit that stores control data used by the CPU to control the optical disk drive device, and an operation of the CPU A RAM storage unit including an area and a storage area for the control data, a boot storage unit for storing a startup program for the CPU, and an error correction unit for error correcting the control data in accordance with a DVD format standard. However, the ROM storage means includes an error correction block in which an error correction code corresponding to the DVD format standard is added to the control data including the plurality of data sectors. Is stored, and the error correction unit Ri with the added error correction code to correct the block, characterized by error correction the control data on the RAM memory unit.

  In the present invention, the ROM storage unit stores the inner parity of the control data as the error correction code, and the error correction unit corrects the control data using the inner parity. Features.

  Further, the present invention is characterized in that the outer parity of the control data is stored as the error correction code in the ROM storage unit, and the error correction unit corrects the control data using the outer parity. To do.

  In the present invention, the ROM storage unit stores inner parity, outer parity, and outer parity of inner parity as the error correction code, and the error correction unit includes the inner parity, outer parity, And error correction of the control data using outer parity of inner parity.

  According to the present invention, the error correction block is subjected to an interleaving process corresponding to a DVD format standard, and the CPU deinterleaves the error correction block according to a DVD format standard, and the error correction unit Using the inner parity, the outer parity, or the outer parity of the inner parity, the outer parity, and the inner parity to perform error correction on the control data of the error correction block that has been deinterleaved. Features.

  The present invention also provides a CPU that controls the optical disk drive device, a ROM storage unit that stores control data used by the CPU to control the optical disk drive device, a work area for the CPU, and a storage area for the control data. Including a RAM storage unit, a boot storage unit that stores a startup program for the CPU, and an error correction encoding unit that performs error correction encoding on the control data in accordance with a DVD format standard, the error correction encoding unit comprising: An error correction block in which an error correction code of the control data is generated according to the DVD format standard on the RAM storage unit, and the error correction code is added to the control data composed of a plurality of data sectors of the DVD format standard. And the ROM storage means stores the error correction block. To.

  Further, according to the present invention, the error correction encoding unit generates an inner parity of the control data as the error correction code, and adds the inner parity to the control data composed of the plurality of data sectors, thereby generating the error. A correction block is generated.

  Further, according to the present invention, the error correction encoding unit generates an outer parity of the control data as the error correction code, adds the outer parity to control data composed of the plurality of data sectors, and adds the error. A correction block is generated.

  Further, according to the present invention, the error correction encoding unit generates an inner parity, an outer parity, and an outer parity of the inner parity as the error correction code, and includes control data composed of the plurality of data sectors. The error correction block is generated by adding the inner parity, the outer parity, and the outer parity of the inner parity.

  Further, in the present invention, the error correction encoding unit generates, as the error correction code, outer parity of the control data, or inner parity, outer parity, and outer parity of the inner parity of the control data, The error correction block is generated by adding to control data composed of a plurality of data sectors, and the CPU interleaves the error correction block according to a DVD format standard.

  According to the present invention, in an optical disk drive device that reads data from or writes data to an optical disk, a CPU that controls the optical disk drive device and control data that the CPU uses to control the optical disk drive device are stored. ROM storage unit, RAM storage unit including the CPU work area and control data storage area, boot storage unit for storing the CPU startup program, and error correcting the control data according to the DVD format standard An error correction / error correction encoding unit that performs correction processing and error correction encoding processing that performs error correction encoding of the control data according to the DVD format standard, and the control data includes a plurality of data sectors of the DVD format standard. ROM storage consisting of The stage stores an error correction block in which an error correction code corresponding to a DVD format standard is added to control data composed of the plurality of data sectors, and the error correction / error correction encoding unit includes: At the time of error correction processing, the error correction code added to the error correction block is used to error-correct the control data on the RAM storage unit, and at the time of the error correction encoding process, a DVD is stored on the RAM storage unit. An error correction code of the control data is generated according to a format standard, and an error correction block is generated by adding the error correction code to the control data composed of a plurality of data sectors of the DVD format standard.

  Further, the present invention is characterized in that the control data is stored in a data area and a management information area defined in the DVD format standard in the data sector.

  Further, the present invention is characterized in that the ROM storage unit is a NAND flash memory.

  Further, the present invention is characterized in that the control data is stored in all areas including a data area and a redundant area of the NAND flash memory.

  According to the optical disk drive device of the present invention, the control data for device control is error-corrected by the error correction unit of the optical disk drive device having high error correction capability corresponding to the DVD format standard. Thereby, in an optical disk drive device that requires highly reliable control data, highly reliable control data can be stored in an inexpensive NAND flash memory. Furthermore, since it is not necessary to provide error correction means dedicated to the NADN type flash memory, the circuit scale of the apparatus can be reduced. As a result, an inexpensive and highly reliable optical disc drive apparatus can be provided by a simple control method.

  According to the optical disk drive device of the present invention, the error correction code of the control data for device control is generated by the error correction encoding unit of the optical disk drive device that generates an error correction code having high error correction capability corresponding to the DVD format standard. The control data is generated and encoded. Thereby, in an optical disk drive device that requires highly reliable control data, highly reliable control data can be stored in an inexpensive NAND flash memory. Furthermore, since it is not necessary to provide error correction coding means dedicated to the NADN type flash memory, the circuit scale of the apparatus can be reduced. As a result, an inexpensive and highly reliable optical disc drive apparatus can be provided by a simple control method.

  Also, according to the optical disk drive apparatus of the present invention, since the control data is stored in the data area and the management information area of the data sector defined by the DVD format standard, the occupation of the error correction code in the NAND flash memory The rate can be lowered. As a result, high-speed error correction can be realized.

  Further, according to the disk drive device of the present invention, since the control data is stored in the entire area including the data area and the redundant area of the NAND flash memory, the area of the NAND flash memory is effectively used. Control data can be stored.

(Embodiment 1)
The optical disk drive device according to the first embodiment complies with the DVD standard. Further, a NAND flash memory is provided as a memory for storing control data. However, the error correction means dedicated to the NAND flash memory is not provided, and is stored in the NAND flash memory by a DVD-ECC (Error correction code) unit for an optical disk drive device having a high error correction capability corresponding to the DVD format standard. The control data is error-corrected. Further, the control data is error-corrected and encoded by a DVD-ECC unit for an optical disk drive device having a high error correction capability corresponding to the DVD format standard without providing an error correction encoding means dedicated to the NAND flash memory. It is characterized by being stored in a type flash memory.

  FIG. 1 is a block diagram showing a configuration of a control unit of the optical disc drive apparatus according to the first embodiment.

  In FIG. 1, the control unit 10 includes a system bus 1, a CPU 2 that controls the optical disk drive device, a RAM 3 that includes a work area of the CPU 2 and a storage area for control data used by the CPU 2 to control the optical disk drive apparatus, and a CPU 2. A boot ROM (BOOT-ROM) 4 for storing a startup processing program (control code), a DVD-ECC unit 5 corresponding to the DVD format standard, a NAND flash memory interface unit 6, and an optical disk drive device A NAND flash memory 7 for storing control data used for the operation, and an external interface 8 such as ATAPI. The DVD-ECC unit 5 has a function for error correction of control data stored in the NAND flash memory 7 and a function for error correction encoding of control data.

  In the first embodiment, the control data is stored in the NAND flash memory 7 in the ECC block format corresponding to the DVD format standard.

  FIG. 7 is a data sector configuration diagram of the DVD format standard, and has an arrangement structure of 172 bytes × 12 rows. In the data sector 71, the ID, IED, and RSV areas are defined as areas for storing management information in the DVD format standard. An EDC (Error Direction Code) arranged at the end of the data sector is a parity for error detection of the entire data sector. This EDC is a 32-bit CRC (Cyclic Redundancy Check) parity, and is used to detect erroneous correction of a data sector after completion of error correction. The ID, IED, and RSV areas are originally areas for storing management information as a DVD format standard, but in the first embodiment, the ID, IED, and RSV areas are also main areas of 12 bytes in total. Control data is stored without distinction from the data area. That is, the main data that can be stored in one data sector is 2048 bytes in the main data area + 12 bytes in the management information area = 2060 bytes. Since the EDC area at the end of the data sector is an error detection parity area for the entire data sector, control data is not stored in this area.

  FIG. 8 is a configuration diagram of an ECC block of the DVD format standard. In the first embodiment, the control data is subjected to error correction, error correction coding, and error detection in units of ECC blocks shown in FIG. The ECC block 81 includes main data 82 obtained by continuously collecting 16 data sectors 71, a PI 83 for storing the inner parity of the main data 82, a PO 84 for storing the outer parity of the main data, and a PIPO 85 for storing the outer parity of the inner parity. Consists of Since the main data 82 is composed of 16 data sectors 71, the capacity is composed of an array of 12 rows × 16 = 192 rows and 172 bytes. Therefore, control data for 2060 bytes × 16 sectors = 32960 bytes that can be executed by the CPU 2 can be stored. As a DVD format standard, one ECC block area including a parity area is 208 rows × 182 bytes = 37856 bytes.

  In the first embodiment, the DVD-ECC unit 5 may use PI83, PO84, and PIPO85 as the parity area when using the PI83 only, when using only the PO84, or when using the PI83, PO84, and PIPO85 when correcting the control data. is there.

  When only PI 83 is used as a parity area, one ECC block unit can be used as 192 rows × 182 bytes = 34944 bytes. In this case, the error correction capability is lowered, but the error correction capability is practically sufficient. By using only the PI 83, the occupancy rate of the parity in the entire NAND flash memory can be lowered, and therefore, error correction can be performed at a higher speed than when both the PI 83 and the PO 84 are used.

  When only PO84 is used as a parity area, one ECC block unit can be used as 208 rows × 172 bytes = 35776 bytes. In this case, the error correction capability is lowered, but the error correction capability is practically sufficient. By using only PO84, the occupancy ratio of the parity in the entire NAND flash memory can be reduced, and high-speed error correction is possible as compared with the case where both PI83 and PO84 are used.

  In addition, error correction with high correction capability is possible using PI83, PO84, and PIPO85.

  Further, the ECC block 81 may be subjected to an interleaving process defined by the DVD format standard. FIG. 9 is a diagram showing an interleaving concept of the DVD format standard. Interleaving can be applied when using only the outer parity or when using both inner parity and outer parity. In the DVD format standard, the outer parity of 16 rows of PO84 is moved one row at a time to the last row of each sector, and each sector is configured to have 13 rows, whereby the ECC block 81 is interleaved. The ECC block 86 interleaved as described above has the advantage of being resistant to burst errors.

  In the first embodiment, the ECC block configured as described above is stored in the NAND flash memory 7. The NAND flash memory 7 stores the ECC block in the entire area including the conventional data area 104 and the redundant area 105. This is because in the first embodiment, the DVD-ECC unit 5 of the optical disk drive apparatus performs error correction coding on the control data and stores the control data in the NAND flash memory 7 in the ECC block format of the DVD format standard. This is because it is not necessary to store the parity defined by the NAND flash memory in the redundant area 105. As a result, the NAND flash memory 7 according to the first embodiment uses the entire area as a control data storage area as compared with the conventional NAND flash memory in which the redundancy is stored in the redundant area 105 with low error correction capability. Can be used effectively.

  FIG. 2 is a diagram showing a memory map of the NAND flash memory 7. In the space 21 of the NAND flash memory 7, there are a management block 22, a non-defective data block 23, and a defective data block 24 located at the top block.

  FIG. 3 is a diagram showing a detailed memory map of the management block 22 of the NAND flash memory 7. In the space 31 of the management block 22, valid data size information 32, a bad block number list 33, and encoding mode information 34 are stored. The valid data size information 32 indicates the data storage size stored in the non-defective product data block. The bad block number list 33 describes all bad block numbers of the NAND flash memory 7 in a list format. The encoding mode information 34 indicates whether the ECC-DVD unit 5 encodes the control data using only the inner parity or only the outer parity during the error correction encoding. It is information indicating whether encoding is performed using both outer parity and outer parity, or encoding is performed by applying interleaving.

  FIG. 4 is a diagram showing a memory map of the RAM 3. In the space 41 of the RAM 3, there are a management block area 42, a work area 43, and a control data storage area 44. The management block area 42 has the same use as the management block 22 located at the head of the NAND flash memory 7. The work area 43 is an area for the DVD-ECC unit 5 to perform work on control data in units of ECC blocks. The control data storage area 44 is an area for storing control data.

  The control data error correction processing in the reading operation of the optical disk drive device according to the first embodiment will be described below with reference to FIG.

  Step S1: The CPU 2 executes the control code stored in the BOOT-ROM 4.

  Step S2: The CPU 2 transfers the contents of the management block 22 to the management block area 42 on the RAM 3 via the NAND flash memory interface unit 6.

  Step S3: The CPU 2 sets the operation of the DVD-ECC unit 5 to the error correction mode.

  Step S4: The CPU 2 reads the encoding mode information 34 relating to the encoding of the control data, and sets the operation mode of the DVD-ECC unit 5. That is, either high-speed error correction with practically sufficient reliability using either inner parity or outer parity is performed, or error correction with high reliability is performed by using both outer parity and inner parity. Set what to do.

  Step S5: The CPU 2 refers to the defective block number list 33 and arranges the non-defective block numbers in ascending order, and sends the control data in the DVD format format from the non-defective block 23 via the NAND flash memory interface unit 6 in ECC units. Transfer to the work area 43 of the RAM 3. That is, the control data is transferred in units of ECC blocks 81 shown in FIG.

  Step S6: The CPU 2 reads the encoding mode information 34 and determines whether or not the control data is interleaved. If the determination result is “Yes”, the process proceeds to step S7, and if “No”, The process proceeds to step S8.

  Step S <b> 7: The CPU 2 performs a deinterleave process for returning the interleaved ECC block 86 to the original ECC block 81 format.

  Step S8: The CPU 2 activates the DVD-ECC unit 5, and the DVD-ECC unit 5 corrects the control data on the work area 43 of the RAM 3 in the operation mode set in step S4.

  Step S <b> 9: The CPU 2 transfers the error-corrected control data from the work area 43 to the control data storage area 44.

  Step S10: The CPU 2 determines whether error correction for the data storage size indicated in the valid data size information 32 has been performed. If the determination result is “No”, the process returns to step S5. As a result, the processes in steps S5 to S9 are repeatedly executed for the size indicated in the valid data size information 32. On the other hand, if the determination result is “Yes”, the process proceeds to step S11.

  Step S11: Control data executable by the CPU 2 is stored in the control data storage area 44.

  Step S12: The control data code is executed.

  Next, error correction coding processing of control data in the writing operation of the optical disk drive device according to the first embodiment will be described with reference to FIG.

  Step S21: The CPU 2 executes the control code stored in the BOOT-ROM 4.

  Step S22: The CPU 2 transfers the contents of the management block 22 to the management block area 42 on the RAM 3 via the NAND flash memory interface unit 6.

  Step S23: The CPU 2 sets the operation of the DVD-ECC unit 5 to the erasure correction mode.

  Step S24: The CPU 2 transfers the encoding mode information 34 of the control data transferred from the external interface 8 and stored in the NAND flash memory 7 to the management block area 42 on the RAM 3.

  Step S25: Based on the encoding mode information 34, the operation mode of the DVD-ECC unit 5 is set. In other words, control data is error-correction coded using either inner parity or outer parity, error-correction coded using both outer parity and inner parity, or bursts using interleaving. Sets whether to perform error correction coding that is resistant to errors.

  Step S26: The CPU 2 issues an erase command to the management block 22 of the NAND flash memory 7 and all non-defective blocks while referring to the defective block number list 33, and erases the NAND flash memory 7. In this erasure process, when an erasure error occurs and an acquired defective block occurs, the CPU 2 adds the defective block number to the defective block list 33 on the management block area 42.

  Step S27: The CPU 2 transfers the control data of the optical disk drive device transferred from the external interface 8 to the control data storage area 44 on the RAM 3.

  Step S28: The CPU 2 transfers the control data on the control data storage area 44 to the work area 43 in the encoding unit (ECC unit) of the DVD-ECC unit 5. That is, the data is transferred to the work area 43 in units of main data 82 shown in FIG.

  Step S29: The CPU 2 activates the DVD-ECC unit 5, and the DVD-ECC unit 5 generates an error correction code of the control data according to the operation mode set in step S25. That is, in the operation mode for generating the inner parity, the inner parity of the control data in the operation mode for generating the inner parity, the outer parity of the control data in the operation mode for generating the outer parity, and in the operation mode for generating the inner parity and the outer parity, Inner parity, outer parity, and outer parity of inner parity are generated for control data, and outer parity of inner parity, inner parity, outer parity, and inner parity is generated in an operation mode that applies interleaving. Then, an ECC block in which the generated parity is added to control data that is main data is generated. That is, the ECC block 81 is generated.

  Step S30: The CPU 2 determines from the encoding mode information 34 whether to apply error correction to the control data by applying interleaving. If the determination result is “Yes”, the process proceeds to step S31. If “No”, the process proceeds to step S32.

  Step S31: The CPU 2 performs an interleaving process for converting the ECC block 81 shown in FIG. 8 into the format of the ECC block 86 shown in FIG.

  Step 32: The CPU 2 writes the ECC block from the work area 43 to the non-defective block 23 of the NAND flash memory 7 via the NAND flash memory interface unit 6. At this time, writing is not performed on the defective block described in the defective block number list 33 in the management block area 42. When an error occurs during writing and an acquired defective block is generated, the defective block number is added to the defective block number list 33, and data is written into a new good data block.

  Step S33: The CPU 2 determines whether the data for the data storage size has been subjected to error correction encoding. If the determination result is “No”, the process returns to step 28. Thereby, the process of step S28-step S32 can be performed to the end of the control data storage area 43 in which the control data is stored. On the other hand, if the determination result is “Yes”, the process proceeds to step S34.

  Step S34: The CPU 2 updates the valid data size information 32 on the RAM 3 to the actually written size. Finally, the contents of the management block area 42 on the RAM 3 are NAND-typed via the NAND-type flash memory interface unit 6. Write to the management block 22 of the flash memory 7.

  The optical disc drive apparatus reads and corrects errors when performing control of the control data written in the NADN flash memory 7 as described above.

  As described above, according to the optical disk drive device of the first embodiment, the control data for device control is error-corrected by the ECC-DVD unit 5 having high error correction capability corresponding to the DVD format standard. . As a result, in an optical disc drive device that requires highly reliable control data, highly reliable control data can be stored in the inexpensive NAND flash memory 7. Furthermore, since it is not necessary to provide error correction means dedicated to the NADN type flash memory, the circuit scale of the apparatus can be reduced.

  Further, according to the optical disk drive apparatus according to the first embodiment, the ECC-DVD unit 5 corresponding to the DVD format standard generates an error correction code of control data for controlling the apparatus, and encodes the control data. It was made to become. As a result, in an optical disc drive device that requires highly reliable control data, highly reliable control data can be stored in the inexpensive NAND flash memory 7. Furthermore, since it is not necessary to provide error correction coding means dedicated to the NADN type flash memory, the circuit scale of the apparatus can be reduced.

  Further, according to the optical disk drive device according to the first embodiment, the control data is stored in the data area and the management information area of the data sector 71 defined by the DVD format standard, and therefore occupies the NAND flash memory 7. Parity occupancy can be reduced. As a result, high-speed error correction can be realized.

  In addition, according to the optical disk drive device according to the first embodiment, since the control data is stored in all areas including the data area and the redundant area of the NAND flash memory 7, the area of the NAND flash memory 7 is made effective. Can be used to store control data.

  The present invention is suitable for an optical disk drive device that uses firmware data for device control stored in a flash memory.

It is a block diagram which shows one structural example of the control part of the optical disk drive device which concerns on Embodiment 1 of this invention. 1 is a memory map diagram of a NAND flash memory of an optical disk drive device according to a first embodiment of the present invention. FIG. 3 is a memory map diagram of a management block of the NAND flash memory of the optical disk drive device according to the first embodiment of the present invention. It is a memory map figure of RAM of the optical disk drive device concerning Embodiment 1 of this invention. It is a flowchart which shows the error correction process in the reading operation | movement of the optical disk drive device based on Embodiment 1 of this invention. It is a flowchart which shows the error correction encoding process in the write-in operation | movement of the optical disk drive device based on Embodiment 1 of this invention. It is a block diagram of the data sector of DVD format specification. It is a block diagram of the error correction block of DVD format specification. It is a block diagram of the error correction block of the DVD format specification by which the interleave process was carried out. 1 is a conceptual block diagram of a NAND flash memory.

Explanation of symbols

1 System bus 2 CPU
3 RAM
4 BOOT-ROM
5 DVD-ECC section 6 NAND flash memory interface section 7 NAND flash memory 8 external interface 10 control section 21 NAND flash memory total space 22 management block 23 good data block 24 defective data block 31 total space 32 management block valid Data size information 33 Bad block number list 34 Coding mode information 41 Total RAM space 42 Management block area 43 Work area 44 Control data storage area 71 Data sector 81 ECC block 82 Main data 83 PI
84 PO
85 PIPO
86 ECC block 101 after interleaving 101 NAND flash memory 102 Page 103 Block 104 Data area 105 Redundant area

Claims (14)

In an optical disk drive that reads data from an optical disk,
A CPU for controlling the optical disk drive device;
A ROM storage unit for storing control data used by the CPU to control the optical disk drive device;
A RAM storage unit including a work area of the CPU and a storage area of the control data;
A boot storage unit for storing a startup program of the CPU;
An error correction unit for correcting the control data according to a DVD format standard,
The control data is composed of a plurality of data sectors of the DVD format standard,
The ROM storage means stores an error correction block in which an error correction code corresponding to the DVD format standard is added to control data composed of the plurality of data sectors,
The error correction unit uses the error correction code added to the error correction block to correct the control data on the RAM storage unit.
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 1,
The ROM storage unit stores an inner parity of the control data as the error correction code,
The error correction unit performs error correction on the control data using the inner parity;
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 1,
The ROM storage unit stores an outer parity of the control data as the error correction code,
The error correction unit corrects the control data using the outer parity;
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 1,
The ROM storage unit stores, as the error correction code, inner parity of the control data, outer parity, and outer parity of inner parity,
The error correction unit uses the inner parity, outer parity, and inner parity outer parity to correct the control data,
An optical disk drive device characterized by that. In the optical disk drive device according to claim 3 or 4,
The error correction block is subjected to interleaving processing corresponding to the DVD format standard,
The CPU deinterleaves the error correction block according to a DVD format standard,
The error correction unit uses the inner parity, the outer parity, or the outer parity of the inner parity, the outer parity, and the inner parity to error the control data of the error correction block that has been deinterleaved. correct,
An optical disk drive device characterized by that. In an optical disk drive device for writing data to an optical disk,
A CPU for controlling the optical disk drive device;
A ROM storage unit for storing control data used by the CPU to control the optical disk drive device;
A RAM storage unit including a work area of the CPU and a storage area of the control data;
A boot storage unit for storing a startup program of the CPU;
An error correction encoding unit that performs error correction encoding of the control data in accordance with the DVD format standard,
The error correction encoding unit generates an error correction code of the control data according to a DVD format standard on the RAM storage unit, and adds the error correction code to the control data composed of a plurality of data sectors of the DVD format standard. Generate an error correction block with
The ROM storage means stores the error correction block;
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 6, wherein
The error correction encoder is
Generating an inner parity of the control data as the error correction code, and generating the error correction block by adding the inner parity to control data composed of the plurality of data sectors;
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 6, wherein
The error correction encoder is
Generating an outer parity of the control data as the error correction code, and generating the error correction block by adding the outer parity to control data composed of the plurality of data sectors;
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 6, wherein
The error correction encoder is
Inner parity, outer parity, and outer parity of inner parity are generated as the error correction code, and the inner parity, outer parity, and outer parity of inner parity are added to the control data composed of the plurality of data sectors. To generate the error correction block,
An optical disk drive device characterized by that. The optical disk drive device according to claim 6, wherein
The error correction encoder is
The outer parity of the control data or the inner parity of the control data, the outer parity, and the outer parity of the inner parity are generated as the error correction code and added to the control data composed of the plurality of data sectors. Generate an error correction block,
The CPU interleaves the error correction block according to a DVD format standard;
An optical disk drive device characterized by that. In an optical disk drive device that reads data from an optical disk or writes data to an optical disk,
A CPU for controlling the optical disk drive device;
A ROM storage unit for storing control data used by the CPU to control the optical disk drive device;
A RAM storage unit including a work area of the CPU and a storage area of the control data;
A boot storage unit for storing a startup program of the CPU;
An error correction / error correction encoding unit that performs error correction processing for error correction of the control data in accordance with the DVD format standard, and error correction encoding processing for error correction encoding of the control data in accordance with the DVD format standard;
The control data is composed of a plurality of data sectors of the DVD format standard,
The ROM storage means stores an error correction block in which an error correction code corresponding to the DVD format standard is added to the control data composed of the plurality of data sectors,
The error correction / error correction encoding unit corrects the control data on the RAM storage unit using the error correction code added to the error correction block during error correction processing, and performs the error correction encoding. During processing, an error correction code for the control data is generated on the RAM storage unit according to the DVD format standard, and the error correction code is added to the control data composed of a plurality of data sectors of the DVD format standard. Generate blocks,
An optical disk drive device characterized by that. In the optical disk drive device according to any one of claims 1, 6, and 11,
The control data is stored in a data area and a management information area defined in the DVD format standard in the data sector.
An optical disk drive device characterized by that. In the optical disk drive device according to any one of claims 1, 6, and 11,
The ROM storage unit is a NAND flash memory.
An optical disk drive device characterized by that. The optical disk drive apparatus according to claim 13, wherein
The control data is stored in all areas including a data area and a redundant area of the NAND flash memory.
An optical disk drive device characterized by that.

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