KR100251049B1 - A method for controlling memory using defect register in dvd-rewritable system, a method for writing defect list by micom and a method for constructing defect register - Google Patents

Abstract

PURPOSE: A memory control method using a defect resist in a DVD(Digital Video Desk)-rewritable playing system is provided to designate physical ID numbers inputted by a DVD-rewritable disk, and to notify the defect resist to a write controller. Therefore, an element of a time delay can be removed. Also, a defect memory can be effectively managed. CONSTITUTION: A write controller receives an address for being played. The write controller reads defect resist. The write controller decides a physical ID number among data read from a disk. The write controller corrects an error of the physical ID number. The write controller decides whether the address is in accord with the physical ID number. If so, the write controller confirms whether a resist bit is 16th. If the address is not in accord with the physical ID number, the write controller decides a physical ID number again. If the resist bit is 16th, the write controller notifies a microcomputer of a reading completion. If the resist bit is not 16th, the write controller confirms whether the corresponding bit is low. If so, the write controller does not record the bit to an error correction memory. If the corresponding bit is not low, the write controller records the bit in the error correction memory.

Description

Memory control method using fault registers in DVD-replayable playback system, fault list recording method by micom, and fault register creation method

The present invention relates to a control method for preventing a defect sector existing in a DVD-Rewritable disc from being recorded in the memory for error correction in constructing a DVD-Rewritable playback system. A memory control method using a bit defect register, a method of writing a defect list by a microcomputer, and a method of creating a defect register.

A brief description of a conventional control method is as follows.

In the conventional control method, the physical ID number read from the disk must be compared with all the defect lists stored in the predetermined memory, and the physical ID number inputted each time must be compared, so that the processing time becomes a problem when there are many defect lists. Since a certain time must pass after reading the physical ID number to determine whether it is a physical sector in the defect list, there is a time delay in writing and controlling the error correction memory. Therefore, once it is recorded, it is restored to the original sector address when it is found to be a defective sector. There is a disadvantage that the operation to be performed.

Looking at the prior art made in this way in detail as follows.

1 is a block diagram of a typical DVD-Rewritable disc reproducing system, in which data read from a disc and modulated in 16/8 and input is composed of a physical sector address (Physical ID number), a data sector address (Data ID number), and main data. Among them, the physical ID number exists only on a DVD-Rewritable disc. The physical ID number is the information indicating the position of data on the disc as a certain number (4 bytes) and is recorded in advance on the disc during disc production.

In the detection of the DVD-Rewritable physical ID number, since a certain pattern is recorded immediately before the physical ID number, 6 bytes are 4 bytes of the physical ID number and 2 bytes of error correction parity, and error correction is performed. To the microcomputer.

The data ID number and main data to be reproduced are 2366 bytes from the part with the physical ID number. The data to be reproduced from this area is deinterleaved, error corrected, descrambled, and error-detected. It is transmitted to the audio / video recorder through this process. When 16 consecutive data sectors of the basic unit of error correction of DVD-Rewritable are recorded in the memory, error correction can be performed. This is because an error correction parity is generated in units of 16 data and sectors before being recorded on the disk, and therefore 16 data sectors must be contiguous when the data is reproduced.

Here, an area where data recording cannot be recorded due to a physical factor of the disk exists. This area is called a defective area, and this defective area is an empty space without any information.

In the DVD-Rewritable Format Book, since the minimum unit of a defective sector is defined as one physical sector, a control operation in units of physical sectors must be performed when playing a DVD-Rewritable disc.

This operation means that if a defective sector is recorded in the process of writing data in the unit of data sector in memory, writing is performed if it is not a defective sector. In addition, error correction is performed for 16 discrete data sectors. This is meaningless, since 16 data sectors must be ignored in the middle even if there are defective sectors, and data sectors must be continuously written to memory. It must wait until the next normal, consecutive sector of data comes to the memory without writing it into memory and then write it to the memory for error correction.

FIG. 2 shows the structure of a DVD-Rewritable disc in which a physical ID number (PHY ID) is recorded in advance, and data to be recorded in the actual error correction memory is recorded after the physical ID number.

The information on defective sectors of a DVD-Rewritable disc differs from disc to disc, and its contents are pre-recorded in the respective disc lead-in areas. This information can be used to determine whether or not to write to the memory for error correction using this information. Here, the information type on the defective sector is a total of 4 bytes of data as the physical ID number.

3 shows a signal for controlling whether or not to write to an error correction memory when there is a defective sector. Consecutive physical ID numbers are recorded on the disk in advance, and a defect list is created based on the physical ID numbers. Therefore, it is necessary to read the physical ID number to know whether the current sector is defective or not. If it is in the defect list, the memory write control signal is set to "LOW" to prevent writing. However, in order to control in this way, the physical ID number read from the disk must be compared with the defect list stored in a certain memory, and the physical ID number inputted and the information in the defect list must be compared. The processing time becomes a problem when there is a lot of defect lists because it must be compared with the physical ID number.

4 is a flowchart illustrating a conventional error correction memory control method. The conventional control method reads the information about the defect of the disc from the lead-in area of the disc, records it in a memory which can be controlled by the microcomputer, and compares the value with the physical ID number which is demodulated in the data area of the disc. If the values are the same, the data is not recorded. If the values are different, the data is recorded in the error correction memory.

That is, the microcomputer needs to continuously compare the physical ID numbers input from the disk and determine whether or not to record in the memory for error correction in comparison with the defect list if it is a sector of a desired area.

In this process, if the defect list is large, the time required for comparison becomes longer, and in some cases, the process of writing to memory is found, and if it is found to be a defect, it is necessary to return to the first address of the sector.

Therefore, the present invention was devised to solve the problems of the conventional method as described above, and allows the microcomputer to manage the defect list in the DVD-Rewritable playback system, and compares the entire defect list with each physical ID number input from the disc. It is a first object of the present invention to provide a method of controlling a memory with a write control unit in order to eliminate a time delay element in writing control of an error correcting memory instead of eliminating an operation of performing the operation.

It is a second object of the present invention to provide a method for recording a defect list in a memory managed by the microcomputer in the system, and a third object of the microcomputer to provide a method for creating a defect register using the memory. do.

1 is a block diagram of a playback system of a typical DVD-Rewritable disc.

2 shows the physical sector structure of a typical DVD-Rewritable disc.

3 is a memory write control signal when there is a defective sector

4 is a control flowchart of a conventional error correction memory;

5 is a diagram illustrating the contents of recording of a defective register according to the present invention.

6 is a flowchart showing a defect list recording method by a microcomputer;

7 is a method of creating a fault register by a microcomputer

8 is a flowchart of an error correction memory write control unit;

Hereinafter, an embodiment of the present invention for achieving the above object will be described in detail.

First of all, a configuration of the present invention for achieving the above-described first object includes a first step of accepting an address to be reproduced; A second step of reading a fault register; A third step of determining a physical ID number among data read from the disk; A fourth step of correcting an error of the physical ID number; A fifth step of judging whether the address to be reproduced and the physical ID number are the same; A sixth step of checking whether a bit of a register is sixteenth if the address to be reproduced and the physical ID number are the same as the determination result of the fifth step, and performing the third step again if the determination result is different; A seventh step of notifying the microcomputer that the read is ended when the bit is the 16th, and checking whether the corresponding bit of the fault register is 'low' if the bit is not the 16th; And an eighth step of writing to the error correction memory if the bit is not 'low' if the bit is 'low' as a result of the checking in the seventh step.

The configuration of the present invention for achieving the above second object, the first step of turning on the power; A second step of reading a defect list on the disc; And a third step of writing to the defect management memory.

A configuration of the present invention for achieving the above-described third object includes a first step of designating an address to be reproduced and picking up a pickup; Reading a list in the defect management memory based on SADR; A third step of writing a defect flag in a 16-bit register on an SADR basis; And checking whether the internal register has been completely read, and performing the second step when the read is completed, and ending when the read is not completed.

Fault flag is information that reads in the lead-in area of disk and manages by microcomputer and assigns one bit to one physical ID number when designating the part to access on disk. Notify the write control unit.

The format of the fault flag passed by Microcomputer uses a fault register. The size of this register is defined as 16 bits, which is 16 bits because the 16 data sectors are the basic units of error correction. Thus, one bit in this register indicates whether or not it is faulty for one physical sector.

That is, the write control unit of the error correction memory performs a function of controlling the writing of the error correction memory by referring to the physical ID number input from the disk and the defect register designated by the microcomputer.

Therefore, if the microcomputer assigns the start physical ID number of the part to be read from the disk to the error correction memory write controller, and Micom informs the memory write controller for error correction in advance, the write controller detects and enters the current disk. By reading the physical ID number of the information, it is possible to determine whether or not it is a defective sector by immediately reading the physical ID number. Therefore, the time delay element is removed during memory control, and the microcomputer continuously updates the fault register in 16-bit units. A list can be passed.

Hereinafter, the operation of the present invention will be described with reference to the accompanying drawings.

Fig. 5 is a diagram illustrating the recording contents of the defect register according to the present invention. 6 is a flowchart showing a method of recording a defect list by a microcomputer in a memory managed by the microcomputer. 7 is a flowchart illustrating a method in which the microcomputer creates a fault register using a memory.

As shown in Fig. 6, when a DVD-Rewritable disc is newly loaded, the microcomputer reads a lead-in area containing various information about the disk, and reads a defect list, which is one of the information, to manage the microcontroller. Record it in memory.

As shown in Fig. 7, when the disc is to be played, the microcomputer gives the physical ID number (SADR) to be found on the disc to the memory write control unit for error correction, generates a defect flag in synchronization with the SADR in the defect management memory, and synchronizes. The generated defect flag is generated based on the physical ID number. If there is a SADR in the defect management memory, a defect flag is generated from this. If not, the defect flag is searched for a list of defects larger than the SADR. .

For example, assuming that SADR is 30000 (hex) address and there is a defect 3000A (hex), as shown in FIG. 5, the defect flag becomes "L" at the tenth address 3000A. Therefore, the 16-bit register is written as follows.

Afterwards, the microcomputer controls the rotation of the disk while moving the pickup (PICK-UP) near the part to be read, so that the part that reads the information recorded on the disk is operated. It receives information about whether it has been read and updates the next 16 information in the fault register.

8 shows the flow of the error correction memory write control unit, which receives a physical ID number (SADR) to be found from the microcomputer and simultaneously reads a fault register synchronized with the same. Initially, it is received like this, and the result of error correction of the physical ID number (SADR) input from the disk is continuously compared with the SADR. If the two values are the same, the value is detected from the first bit of the fault register. Write is performed to the memory, and if it is " Low "

If the comparison is completed up to the 16th bit of the SADR and the fault register, the microcomputer asks the microcontroller to update the fault register with information about the next 16 sectors, and when this request occurs, the microcomputer reports fault information for the next 16 sectors in the fault management memory. Is written to the fault register.

As described above, the present invention designates the physical ID number of the portion of the DVD-Rewritable disc to be read to the write control unit, and the size of the register in the method in which the microcontroller informs the write control unit of the defective register synchronized with the write control unit. To 16 bits so that each bit corresponds one-to-one with the sector, and if the physical ID number detected and input from the disk is the same as the physical ID number specified by the microcomputer, the write control section refers to the defect register and the currently entered sector is defective. As it is possible to immediately determine whether or not it is recognized, the element of time delay is eliminated, and the fault register is updated by the microcomputer in 16 units so that the fault memory can be managed efficiently and the fault correction memory write control unit continuously It is easy to detect .

Claims (5)

A first step of accepting an address to be reproduced; A second step of reading a fault register; A third step of determining a physical ID number among data read from the disk; A fourth step of correcting an error of the physical ID number; A fifth step of judging whether the address to be reproduced and the physical ID number are the same; A sixth step of checking whether a bit of a register is sixteenth if the address to be reproduced and the physical ID number are the same as the determination result of the fifth step, and performing the third step again if the determination result is different; A seventh step of notifying the microcomputer that the read is ended when the bit is the 16th, and checking whether the corresponding bit of the fault register is 'low' if the bit is not the 16th; And And the eighth step of writing to the error correction memory if the bit is not low if the bit is 'low' as a result of the checking in the seventh step. Memory control method using fault register in rewritable system. The method of claim 1, wherein the microcomputer uses 16 bits as a basic unit when the microcomputer passes the defect flag to the write control unit. The register of claim 1, wherein there is a 16-bit register, which reads the 16th bit from the controller of the error correction memory to inform the micom that the register has been read. Continuity is maintained in referring to the contents of the fault register according to the memory register. CLAIMS What is claimed is: 1. A method of writing a fault register in a memory managed by a microcomputer in a DVD-Rewritable system, comprising: a first step of turning on a power; A second step of reading a defect list on the disc; And And a third step of recording in the defect management memory. The method for recording a defect list by a microcomputer in a DVD-Rewritable system. CLAIMS 1. A method for creating a defect register by a microcomputer in a DVD-Rewritable system, comprising: a first step of designating an address to be reproduced and picking up a pickup; Reading a list in the defect management memory based on SADR; A third step of writing a defect flag in a 16-bit register on an SADR basis; And A method of creating a defective register by a microcomputer in a DVD-Rewritable system, characterized in that the second step is performed after the reading of the internal register and the reading is completed.

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