KR100223190B1 - Structure of buffer memory in dvd-ram system - Google Patents
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- KR100223190B1 KR100223190B1 KR1019970005675A KR19970005675A KR100223190B1 KR 100223190 B1 KR100223190 B1 KR 100223190B1 KR 1019970005675 A KR1019970005675 A KR 1019970005675A KR 19970005675 A KR19970005675 A KR 19970005675A KR 100223190 B1 KR100223190 B1 KR 100223190B1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00745—Sectoring or header formats within a track
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/1062—Data buffering arrangements, e.g. recording or playback buffers
- G11B2020/10629—Data buffering arrangements, e.g. recording or playback buffers the buffer having a specific structure
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
- G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
- G11B2020/1222—ECC block, i.e. a block of error correction encoded symbols which includes all parity data needed for decoding
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
- G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
- G11B2020/1232—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc sector, i.e. the minimal addressable physical data unit
Abstract
개시된 내용은 DVD-RAM시스템의 RAM-드라이브에서 데이타처리를 위한 버퍼메모리의 사용효율을 높일 수 있도록 제시된 DVD-RAM시스템의 버퍼메모리구조에 관한 것이다. 본 발명은 버퍼메모리의 영역을 DVD-RAM 규격에 근거하여 다수개의 에러정정부호화(ECC)하기 위한 16개의 데이타섹터로 된 ECC블록과 그에 대응하는 외부패리티코드(PO)영역으로 나누고, 나머지는 확장영역(EXTENDED AREA)으로 할당한다. 그리고, 버퍼메모리상에서 각각의 데이타섹터시작위치와 ECC블록시작위치를 고정시켜 두어 그 위치정보를 섹터와 블록시작포인터로 하여 사용한다. 따라서, 본 발명은 버퍼메모리에 확장영역이 존재하도록 하여 메모리공간을 효율적으로 사용할 수 있도록 하는 효과를 제공한다.The present disclosure relates to a buffer memory structure of a DVD-RAM system, which is proposed to increase the efficiency of using a buffer memory for data processing in a RAM-drive of a DVD-RAM system. The present invention divides an area of a buffer memory into an ECC block of 16 data sectors for corresponding error correction coding (ECC) based on a DVD-RAM standard and an external parity code (PO) area corresponding thereto, and the rest of the buffer memory is extended. Allocate to EXTENDED AREA. Each data sector start position and ECC block start position are fixed in the buffer memory, and the position information is used as a sector and a block start pointer. Accordingly, the present invention provides an effect of allowing the extended area to exist in the buffer memory so that the memory space can be efficiently used.
Description
본 발명은 DVD-RAM시스템에 관한 것으로, 보다 상세하게는, DVD-RAM의 데이타를 처리하기 위한 버퍼메모리의 공간을 효율적으로 이용하기 위한 버퍼메모리구조에 관한 것이다.The present invention relates to a DVD-RAM system, and more particularly, to a buffer memory structure for efficiently utilizing a space of a buffer memory for processing data of a DVD-RAM.
최근에는 방대한 양의 비디오와 오디오신호 등의 데이타를 기록 및 재생하기 위하여 디지탈비디오디스크(Digital Video Disc; DVD)가 사용되고 있으며, 보다 많은 양의 데이타를 기록하기 위하여 고밀도 기록기술 및 고정도 검출기술에 대한 필요성이 점차 광자기디스크를 사용하는 시스템에 요구되어지고 있다. DVD-RAM은 차세대 각광받는 디지탈데이타의 저장매체로서 대용량으로 하드디스크를 대체할 것으로 기대되는 디바이스이다.Recently, digital video discs (DVDs) have been used to record and play back large amounts of video and audio signals, and high-density recording technology and high-precision detection technology have been used to record larger amounts of data. There is a growing need for systems using magneto-optical disks. DVD-RAM is a storage medium for the next generation of digital data, and is expected to replace a hard disk with a large capacity.
일반적으로 DVD-RAM시스템은 컴퓨터상에서 RAM-드라이브를 통해 RAM-디스크에 데이타를 기록하거나 기록된 데이타를 읽어들여 재생한다. 이때, RAM-드라이브에는 RAM-디스크와 컴퓨터간에 데이타를 일정한 비트레이트(bit rate)로 주고 받을 수 있도록 하거나 내부의 데이타프로세서에서 데이타를 기록하기 전 내지 재생하기 전에 변/복조, 에러정정부호화(ECC) 인코딩/디코딩 등의 필요한 각종 처리를 하기 위하여 데이타를 버퍼메모리에 버퍼링하여 사용한다.In general, a DVD-RAM system records data on a RAM-disk or reads and reproduces recorded data through a RAM-drive on a computer. In this case, the RAM-drive can transmit / receive data between the RAM-disk and the computer at a constant bit rate, or change / demodulate and error-correction coding (ECC) before recording or playing back data in an internal data processor. ) The data is buffered and used in the buffer memory for various processing such as encoding / decoding.
따라서, 본 발명의 목적은 DVD-RAM 규격에 맞으면서 메모리 공간을 효율적으로 사용할 수 있는 버퍼메모리 구조를 제시함에 있다.Accordingly, an object of the present invention is to propose a buffer memory structure that can efficiently use a memory space while conforming to the DVD-RAM standard.
도 1은 본 발명의 바람직한 실시예에 따른 DVD-RAM시스템의 버퍼메모리구조를 나타내는 개념도.1 is a conceptual diagram showing a buffer memory structure of a DVD-RAM system according to a preferred embodiment of the present invention.
이와 같은 목적을 달성하기 위한 본 발명에 따른 DVD-RAM시스템의 버퍼메모리구조는, DVD-RAM 규격에 근거하여 데이타섹터들로 된 에러정정부호화(ECC)블록 다수개와 그에 대응하는 별도의 외부패리티코드들 다수개를 위한 각각의 영역으로 구분하며 나머지는 확장영역으로 구분하고, 각 데이타섹터시작위치와 ECC블록시작위치를 고정하는 것을 특징으로 한다.In order to achieve the above object, a buffer memory structure of a DVD-RAM system according to the present invention includes a plurality of error correcting code (ECC) blocks made of data sectors and corresponding external parity codes based on the DVD-RAM standard. These are divided into respective areas for a plurality of fields, and the rest are divided into extended areas, and each data sector start position and ECC block start position are fixed.
이하, 첨부한 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 기술하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명에 따른 DVD-RAM시스템의 버퍼메모리구조를 나타내는 개념도이다.1 is a conceptual diagram illustrating a buffer memory structure of a DVD-RAM system according to the present invention.
먼저, 버퍼메모리 구조를 설명하기에 앞서 DVD-RAM 규격을 보면, 데이타는 섹터(sector)단위로 구성된다. 하나의 데이타섹터 크기는 2064바이트이고, 172바이트씩 12줄로 구성된다. 이 하나의 데이타섹터는 2048바이트의 메인데이타와 첫번째줄에 위치한 12바이트의 아이디(ID)데이타 및 마지막줄에 위치한 4바이트의 에러검출코드(error detection code; EDC)를 포함한다. 데이타섹터가 16개 모인 즉, 32킬로바이트(2048바이트×16)가 RAM-디스크의 파일처리단위가 되고, 데이타를 RAM-디스크에 기록하기 전에 에러정정부호화(ECC)하는 단위가 된다. 즉, 1ECC블록의 크기는 32킬로바이트이다. RS코드 등에 의한 에러정정부호화시 ECC블록은 각 데이타섹터에 대해 10바이트의 내부패리티코드(inner parity code; PI)와 16바이트의 외부패리티코드(outer parity code; PO)가 붙는다. 그래서, 행-인터리브(row interleave)후 ECC블록은 182바이트(172바이트에 내부패리티코드 10바이트 추가)씩 208줄(13×16)로 구성된다.First, prior to explaining the buffer memory structure, the DVD-RAM standard shows that data is organized in sector units. One data sector is 2064 bytes in size and consists of 12 lines of 172 bytes. This one data sector contains 2048 bytes of main data, 12 bytes of ID data on the first line, and 4 bytes of error detection code (EDC) on the last line. 16 data sectors, that is, 32 kilobytes (2048 bytes x 16), become a file processing unit of a RAM-disk, and a unit of error correction coding (ECC) before data is written to the RAM-disk. That is, the size of one ECC block is 32 kilobytes. In error correction coding using an RS code, an ECC block is appended with an inner parity code (PI) of 10 bytes and an outer parity code (PO) of 16 bytes for each data sector. Thus, the ECC block after row interleave consists of 208 lines (13 x 16) of 182 bytes (172 bytes plus 10 bytes of internal parity code).
위와 같은 DVD-RAM 규격에 근거하여, 도 1에 보여지는 버퍼메모리는 512열(column)×512행(row)×4비트(bit)×2의 2메가비트(MBit) 크기를 기본으로 하고, 기본행렬을 확장하여 1024열×512행×8비트의 4메가비트(MBit) 크기로도 사용한다. 2MBit 크기의 버퍼메모리를 사용하는 경우를 일예로 하면, 하나의 데이타섹터는 32열×6행 크기의 12개 블록으로 구성된다. 각 블록에는 10바이트의 더미데이타(dummy data)가 포함되므로 하나의 데이타섹터는 행-인터리브후 ECC블록의 데이타섹터에서 외부패리티코드(PO)를 제외한 나머지 크기인 182바이트씩 12행에 120바이트가 추가된 크기를 갖는다. 그래서, 버퍼메모리는 그 크기의 데이타섹터 16개를 1ECC블록으로 하여 6개의 ECC블록(ECC(0)∼ECC(5))과, ECC블록에서 제외된 16행단위의 6개의 외부패리티코드(PO(0)∼PO(5))을 별도로 하여 영역을 구분하며, 나머지는 확장영역(extended area)으로 구분한다. 이렇게 영역이 구분된 버퍼메모리상에서 데이타섹터의 시작위치 및 ECC블록의 시작위치를 고정시켜두고, 이 위치정보를 각각 섹터와 블록포인터로 하여 사용한다. 여기서, 하나의 ECC블록의 크기는 512열×72행이고, 확장영역은 메모리주소 3C0000H부터 3FFFFFH의 16킬로비트 공간이 할당되며 기타의 다른기능을 수행시 필요할 경우 추가로 사용된다. 한편, 4MBit 크기의 버퍼메모리 사용시에도 2MBit 크기의 버퍼메모리와 동일한 구조를 갖는다. 이 경우에는 보다 많은 수의 ECC블록과 외부패리리코드영역으로 구분할 수 있다.Based on the above DVD-RAM standard, the buffer memory shown in Fig. 1 is based on a size of 2 megabits (MBit) of 512 columns x 512 rows x 4 bits x 2, It extends the base matrix and uses it as 4 megabit (MBit) size of 1024 columns × 512 rows × 8 bits. As an example of using a 2MBit buffer memory, one data sector is composed of 12 blocks of 32 columns x 6 rows. Each block contains 10 bytes of dummy data, so one data sector is 120 bytes in 12 rows of 182 bytes, excluding the external parity code (PO) in the data sector of the ECC block after row-interleaving. Has an added size. Thus, the buffer memory uses six ECC blocks (ECC (0) to ECC (5)) with sixteen data sectors of that size as one ECC block, and six external parity codes (PO) in units of 16 rows excluded from the ECC block. Areas are separated by (0) to PO (5)), and the rest are divided into extended areas. In this way, the start position of the data sector and the start position of the ECC block are fixed in the buffer memory where the area is divided, and this position information is used as a sector and a block pointer, respectively. Here, the size of one ECC block is 512 columns x 72 rows, and the extended area is allocated 16 kilobit spaces of memory addresses 3C0000H to 3FFFFFH, and is additionally used when necessary to perform other functions. On the other hand, even when using a 4MBit buffer memory has the same structure as a 2MBit buffer memory. In this case, it can be divided into a larger number of ECC blocks and an external parry code region.
상술한 바와 같이, 본 발명은 DVD-RAM시스템의 버퍼메모리구조에 관한 것으로 DVD-RAM 규격에 근거하여 버퍼메모리의 영역을 다수의 ECC블록과 외부패리티코드영역으로 구분하고, 나머지를 확장영역으로 할당하여 메모리공간을 효율적으로 사용할 수 있도록 한다.As described above, the present invention relates to a buffer memory structure of a DVD-RAM system. The buffer memory area is divided into a plurality of ECC blocks and an external parity code area based on the DVD-RAM standard, and the rest is allocated as an extended area. To make efficient use of memory space.
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