KR19990047996A - Defect Sector Detection Apparatus and Method for Recording or Reproducing Data in Digital Video Disc-RAM System - Google Patents

Abstract

The technical field to which the invention described in the claims belongs.

A digital video disc-RAM system.

B. Technical problem to be solved

An apparatus and method are provided for detecting defect sectors during disc playback or recording in a digital video disc-RAM system.

C. Summary of the Solution

A defect sector address storage unit and an address comparison unit are newly provided in the data processor of the digital video disk-RAM system to compare the two sectors by comparing the defect sector address and the physical sector address detected by the physical sector detector during data reproduction or recording. If the addresses are the same, an interrupt signal is generated and applied from the address comparison unit to the system control micom of the digital video disk-RAM system so that the system control micom moves the position of the pickup being recorded or reproduced to another preset sector area. It is characterized by.

D. Significant Uses of the Invention

Used for recording or reproducing data in a digital video disc-RAM system.

Description

Defect Sector Detection Apparatus and Method for Recording or Reproducing Data in Digital Video Disc-RAM System

The present invention relates to a Digital Video Disk-RAM (hereinafter referred to as "DVD-RAM") system, and more particularly to an apparatus and method for detecting a defect sector in a DVD-RAM system.

Generally, discs used in DVD-RAM systems have sectors that cannot record or play data due to physical reasons. These sectors are commonly referred to as defect sectors. Information about the defect sector is recorded in a Primary Defect List (PDL) and Secondary Defect List (SDL) area of a lead-in area of the disc. The PDL contains defect information in units of sectors, and a sector which replaces the defect information is positioned immediately after the defect sector. In the defect list in the SDL, there is defect information in units of ECC blocks (16 data sectors), and the sectors to replace the sectors are located in the spare areas of the respective areas of the disk. When recording or playback is completed, recording or playback is resumed at the original defect position.

Accordingly, in the conventional DVD-RAM system, a physical sector address (hereinafter, referred to as a physical sector address) read from the disc or recorded on the disc after reading the lead-in area and storing information on the defect sector during recording or playback on the disc When the PID is located in the defect sector area, the " PID " is skipped and moved to another sector replacing the defect sector to read or write data.

Referring to FIG. 1, which shows a block diagram of a general DVD-RAM system in order to examine the operation of the conventional DVD-RAM system, the DVD-RAM system in the conventional DVD-RAM system, as described above, is used to record or reproduce data. Detecting the PID of the data to be reproduced or recorded by using the defect sector information present in the RAM disk and checking whether the PID is located in the defect sector and replacing the PID when the PID is located in the defect sector. Since a series of processes of moving to another sector and reading or writing are all performed by the control of the system control microcomputer 20, there is a problem in processing data at high speed.

As described above, since the process of detecting the PID of the data to be reproduced or recorded and checking whether the PID is in the defect sector area is performed by the system control microcomputer 20, there is a problem in processing the data at high speed. There was this.

Accordingly, an object of the present invention is to provide a defect sector detection apparatus and method for processing data at high speed during reproduction or recording of data in a DVD-RAM system.

1 is a block diagram of a general digital video disk-RAM system;

2 is a block diagram illustrating a defect sector detection device provided in a data processor according to an embodiment of the present invention;

3 is a process flowchart of detecting a defect sector during reproduction of data in a digital video disk-RAM system according to an embodiment of the present invention.

In order to achieve the above object, the present invention provides a defect sector address (hereinafter referred to as "defect sector ID") storage unit and an address comparison unit (hereinafter referred to as "ID comparison unit") in a data processor of a DVD-RAM system. In case of reproducing or recording data, the PID detected by the PID detection unit and the defect sector ID are compared. When the two IDs are the same, an interrupt signal is sent from the ID comparison unit to the system control micom of the DVD-RAM system. It is characterized in that it is generated and applied so that the system control micom moves the position of the pickup being recorded or reproduced to another preset sector area.

First, the general operation of the DVD-RAM system will be described with reference to FIG. 1, which shows a schematic block diagram of a general DVD-RAM system. In FIG. 1, when the disk 10 is rotated, the disk motor starts to rotate at a predetermined speed. Pick Up and Deck 12 are pickups for outputting laser light and receiving reflected light thereof to read data from the disc 10, rotation of the disc 10, transfer of pickups and discs. (10) It consists of a deck which is a mechanism for performing a loading operation. The signal reproducing and servo control unit 14 includes a signal reproducing function such as amplification of RF signals output from the optical pickup, noise reduction, digital conversion of analog RF signals, and synchronization detection, and a disc 10 for reproducing the signals. Disk rotation control, accurate focusing and tracking control of the pickup. The servo control unit is controlled by the system control microcomputer 20 and the EFM signal output from the signal reproducing and servo control unit 14 is input to the data processor 16. The data processor 16 demodulates the EFM signal input from the signal reproducing and servo control unit 14, and performs data PLL, descrambling, error detection and correction, and control of the track buffer 18 by synchronous detection. Usually, since the transmission rate of the signal read out from the disk 10 is greater than or equal to the transmission rate output from the data processor 16 to the ATAPI interface unit 22, the decoded data is temporarily stored in the track buffer 18 and then again stored in the ATAPI interface unit. The data is transferred in accordance with the request of (22). This series of processes is performed by the system control micom 20 so that the overflow or underflow of the track buffer 18 does not occur. In recording, the data transmitted from the ATAPI interface unit 22 is stored in the track buffer 18 in the reverse process, and the signal is reproduced in the form of serial data through descrambling, error detection and correction, and EFM modulation. And to the servo control unit 14. The ATAPI interface unit 22 transmits data from the data processor 16 to the host while providing an appropriate interface by the ATAPI command received from the host. The system control microcomputer 20 performs an overall control operation of the DVD-RAM system according to key data input from a key input unit and a remote controller (not shown). That is, the system control microcomputer 20 reads predetermined data from the disk 10 through servo control, data search, and deck mechanism control. Also, the data processor 16 is controlled to perform track buffering and to display display data generated during the control operation on the front display unit.

FIG. 2 is a block diagram illustrating an internal block diagram of a data processor including a defect sector detecting apparatus according to an exemplary embodiment of the present invention. The defect sector ID storage unit 200 and the defect sector ID storage unit 200 of the data processor 16 of FIG. It can be seen that a defect sector detection device including a PID detection unit 204 and an ID comparison unit 202 is newly provided. The defect sector ID storage unit 200 receives the defect sector ID closest to the PID where the current pickup is located by referring to the defect sector list read from the lead-in area of the disc. Stored. The PID detection unit 204 detects the PID from data read and applied from the disk on which the current pickup is located as in the usual case. The ID comparison unit 202 checks whether the defect sector ID stored in the defect sector ID storage unit 200 and the PID detected by the PID detection unit 204 are the same, so that the defect sector ID and the PID are the same. In this case, an interrupt is generated by the system control microcomputer 20.

3 is a flowchart illustrating data processing during playback in a DVD-RAM system having a data processor including a defect sector detection apparatus according to an exemplary embodiment of the present invention. The operation according to the flowchart of FIG. 2 is performed by the system control microcomputer 20 of FIG. An embodiment of the present invention will now be described in detail with reference to FIGS. 1, 2, and 3.

First, when the disc 10 is played back, the system control microcomputer 20 reads information on the defect sector list in the SDL and PDL areas of the disc lead-in area among the data of the disc read out from the optical pickup in step 300. Read it. The system control microcomputer 20 proceeds to step 302 and the defect sector ID storage unit 200 in the data processor 16 receives the defect sector ID closest to the PID inputted from the disk sector in which the current pickup is located. Save it to Accordingly, the data processor 16 inputs the PID detected from the data read out from the pickup and the defect sector ID stored in the defect sector ID storage unit 200 to the ID comparison unit 202 to continue comparison. do. At this time, when the PID and the defect sector ID are not the same, the input data is controlled and reproduced by the system control microcomputer 20 as in a normal case. In contrast, when the PID and the defect sector ID are the same, the data processor 16 stops the operation and generates an interrupt to the system control microcomputer 20. The system control microcomputer 20 then checks whether an interrupt is generated from the data processor 16 in step 304, and if the interrupt does not occur, proceeds to step 306 and enters the input as in the normal case as described above. The data to be played back are reproduced.

On the contrary, if an interrupt occurs from the data processor 16, the system control microcomputer 20 proceeds to step 308 to control the servo control and signal reproducing unit 14 to replace the pickup located in the defect sector area. Move to. The system control microcomputer 20 proceeds to step 310 and finds the defect sector ID that is closest to the position of the currently moved pickup by referring to SDL and PDL again, and stores the defect sector ID in the data processor 16. The defect sector ID is stored at 200, and the steps 302 to 310 are repeated.

Therefore, since the defect sector detection device in the data processor checks whether a sector is defective, it is possible to prevent a delay in data processing speed caused by the system control microcomputer detecting the defect sector.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. In particular, although the embodiment of the present invention exemplifies data processing during reproduction in the digital video disc RAM system, the same applies to processing data during recording in the digital video disc RAM system. Therefore, the scope of the invention should not be defined by the described embodiments, but should be determined by the equivalents of the claims and the claims.

As described above, the present invention has the advantage that the data processing speed is improved by reducing the defect sector detection time in the system control microcomputer, in which the defect sector detection device in the data processor is checked for defects.

Claims (2)

An apparatus for detecting a defect sector during recording and playback of a disc in a digital video disc-RAM system, comprising: A physical sector address detector for detecting a physical sector address of input data; A defect sector address storage unit storing the defect sector address; An address comparison unit for comparing the physical sector address applied from the physical sector address detection unit with the defect sector address applied from the defect sector address storage unit and generating an interrupt signal when they are equal to each other; From the defect sector list read from the read-in area of the disc, the address of the defect sector that is closest to the physical sector address of the input data is found, stored in the defect sector address storage unit, and the interrupt from the address comparison unit. And a system control micom for shifting the position of the pickup to another preset sector area upon receiving a signal. A method for detecting a defect sector during recording and playback of a disc in a digital video disc-RAM system further comprising a defect sector address storage unit, a physical sector address detection unit, and an address comparison unit in a data processor. Reading information about the defect sector list, Storing, from the defect sector list, the defect sector address closest to the physical sector address where the current pickup is located in the defect sector address storage unit; When the defect sector address applied from the defect sector address storage unit and the physical sector address applied from the physical sector address detection unit are the same, when the interrupt signal generated from the address comparison unit is applied, the position of the pickup is preset. Moving to the area, And detecting the defect sector address closest to the physical sector address of the moved sector area from the defect sector list and storing the defect sector address in the defect sector address storage unit. Flaw sector detection method.