KR20030075528A - Method and apparatus for operating memory in optical disc record/player - Google Patents

Abstract

PURPOSE: A method for operating a memory of an optical disk recorder/reproducer is provided to divide the memory into many regions, and to move to a next region whenever discontinuous commands are generated, then to store corresponding data as managing information on the divided regions, thereby improving performance of the optical disk recorder/reproducer. CONSTITUTION: An optical disk recorder/reproducer divides a memory into many regions. If read or write commands are continuously generated, the reproducer continuously records corresponding data in the regions of the memory in order, and stores information on the regions. If the read or the write commands are discontinuously or alternately generated, the reproducer records the data from a next region of an ongoing region, and stores information on a just previous region and information on a new region.

Description

TECHNICAL FIELD AND APPARATUS FOR OPERATING MEMORY IN OPTICAL DISC RECORD / PLAYER

The present invention relates to a method and apparatus for operating a memory in an optical disc recorder during recording and reproduction of data.

In general, an optical recording medium, that is, an optical disc recording and reproducing apparatus for recording and reproducing an optical disc, reproduces data recorded on the optical disc using an optical disc such as a compact disc (CD), a digital versatile disc (DVD), or the like as a recording medium. And a device for recording data on the disc.

The DVD is not much different from the CD in terms of implementation. That is, the data is recognized on the same principle as the CD for recognizing the data of 0 and 1 by the difference in the amount of light reflected by the laser. The difference is that the data storage is smaller than the CD.

The host can be connected to the above-described optical disc recording / reproducing apparatus as shown in FIG. Here, the host is a kind of personal computer (PC), in which the optical disc recording and reproducing apparatus is supported by the PC.

The host transmits a read / write command as shown in Figs. 2 and 3 to the optical disc recording / reproducing apparatus during recording / reproducing, and the optical disc recording / reproducing apparatus is recorded on the optical disc according to the read / write command of the host. Data is reproduced and transmitted to the host, or data transmitted from the host is recorded on the optical disc.

That is, FIG. 2 illustrates an example of a general read command format outputted from the host to the optical disc recording and reproducing apparatus when data is reproduced from the optical disc, and FIG. FIG. 1 shows an example of a write command format output from a host to an optical disk recording / reproducing apparatus.

In this case, the read / write command includes a Logical Block Address (LBA) that specifies a read or write position and a transfer length that informs the size of the data that follows.

For example, when reproducing data recorded on an optical disc, the host generates a read command as shown in FIG. 2 and outputs the read command to the optical disc recording and reproducing apparatus, wherein the optical disc recording and reproducing apparatus is set within the optical disc designated by the read command. Data is read from the LBA by the transfer length and stored in a memory (not shown) in the optical disc recording and reproducing apparatus. Then, the optical disc recording and reproducing apparatus reads the data stored in the memory and transfers the data back to the host.

On the other hand, when data to be recorded on the optical disc is generated, the host sends the data to be recorded to the optical disc recording and reproducing apparatus together with the write command as shown in FIG. The optical disc recording and reproducing apparatus stores the data transmitted from the host again in a memory allocated in the optical disc recording and reproducing apparatus, and then stores the data as much as the transmission length from the target recording position (ie, LBA) in the optical disc designated by the write command. Record it.

At this time, the optical disc recording and reproducing apparatus should respond to the command with a minimum time delay when a read or write command is transmitted from the host.

Therefore, in order to minimize the time delay, when a read command is input during reproduction, not only the data of the address specified by the current read command but also the data of the next address are read in advance and stored in the memory. This operation is called a pre reading operation. Then, when the next read command is input, it checks whether the data of the requested read command and the previously read data match and then transfers the data in memory directly to the host if they match. This process is repeated as long as the read command is continued. This is possible because the probability that the data you want on the host is immediately after the data you wanted before.

However, read and write commands may be sent alternately or discontinuously at the host. For example, read (0) command / lead (1) command / lead (2) command / lead (8) command ... / lead (N) command / write (0) command / lead (N + 1) command Assume that a read / write command is sent to.

Then, after the read (N) command, the information after the read (N + 1), which has been read from the disk and stored in the memory by the pre-reading operation, is deleted from the memory while performing the write (0) command. That is, since the data transmitted with the write (0) command is overwritten from the beginning of the memory and written, the remaining data except for the data transmitted with the write (0) command and stored in the memory, in particular, the read (N +) 1) The information of the order is lost.

When the read (N + 1) command is received after the write (0) command, the data of the position designated by the read (N + 1) command is read back from the disk, overwritten from the beginning of the memory, and stored. To send.

If the data specified by the read 8 command is not already stored in the memory when the read 8 command is received, the data is similarly read from the optical disc at the location specified by the read 8 command and stored in the memory. Overwrite from the beginning, save and send to the host.

In this way, if a read command is not transmitted continuously, or a write command is not transmitted continuously, a discontinuity point occurs in the read or write command, or if the read command and the write command occur alternately, the read command may advance from the disk in advance. The data read and stored in the memory is lost, which slows down the optical disc recording and reproducing apparatus. That is, when a read or write command is received from the host, a delay occurs in response time according to the command, thereby degrading the performance of the optical disc recording / reproducing apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to divide a memory in an optical disc recording and reproducing apparatus into a plurality of areas, and to move to the next area and store the corresponding data whenever a discontinuity occurs in a command. The present invention provides a memory operating method and apparatus for an optical disk recording / reproducing apparatus that improves the performance of the optical disk recording / reproducing apparatus by separately managing information on the divided regions.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a general diagram showing a data transfer process between an optical disc recording and reproducing apparatus and a host.

2 illustrates an example of a general read command format.

3 illustrates an example of a general write command format.

4A illustrates an example in which a memory is divided into a plurality of segments in the optical recording and reproducing apparatus according to the present invention.

4B illustrates an example of a segment queue for storing information about each segment of FIG. 4A.

A memory operating method of an optical disc recording / reproducing apparatus according to the present invention for achieving the above object comprises: storing data read from a disc according to a read command sent from a host, or data transmitted with a write command from a host. Dividing the memory in the optical disc recording / reproducing player that stores the data into a plurality of areas, and separately storing information about the area while sequentially writing the data in the area of the memory if the read or write command is continuous. And separately storing the information about the immediately previous area and the information about the new area while recording the corresponding data from the next area of the current recording area when discontinuities occur or alternately occur in the read or write command. What is done It features.

The discontinuous read / write command processing step may include checking whether data requested by the read command is read in advance and stored in a specific area of the memory when the read command occurs when the discontinuity occurs in the read command. Transmitting the corresponding data stored in the specific area to the host if it is determined that the data is stored in the step; and if the data stored in the specific area is not immediately stored in the step, the data immediately before the data requested by the read command. Determining whether the specific area is a pool if the data stored in the specific area is immediately before the data requested by the read command; and if it is determined in the step that the specific area is not the pool, Data requested by the lead order Reading from a disk and continuously storing the data in the specific area; and if the data stored in the specific area in the step is not the data immediately before the data requested by the read command, or the specific area is full, the read command And reading the data requested from the disc from the disk and starting from the next area of the area where recording is in progress.

The information on the separately stored region may include a start position of the region in the memory and a data size recorded in the region.

The memory operating apparatus of the optical disc recorder according to the present invention is divided into a plurality of segments, and writes the data read from the disc into a specific segment according to a read command transmitted from the host, or has been transmitted with a write command from the host. When data is recorded in a specific segment and a discontinuity occurs in the read / write command, the memory in the optical disc recorder that records the data from the next segment of the specific segment currently being recorded, and the number of divided segments of the memory. And a segmented area, each area including a memory control unit having a segment queue in which a start position of the segment and a data size stored when data is stored in the segment.

The memory controller may be configured as a microcomputer. If a discontinuity occurs in a read / write command transmitted from the host, the data may be continuously recorded in a specific segment by referring to a segment start position and a data size stored in the segment queue. Or control to record from the segment following the segment in which recording is in progress.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4A and 4B are block diagrams showing examples of dividing a memory into segments in an optical disc recording and reproducing apparatus according to the present invention, and a segment queue in a microcomputer.

That is, the present invention divides the memory in the optical disc recording / reproducing apparatus into several areas having a certain size, and then each of these areas is called a segment.

Here, the unit of the divided region, for example, the segment unit may vary according to the designer, and may be, for example, a unit of DVD 1 ECC block (ie, 16 sectors).

At this time, since the memory is divided into a plurality of segments, it is possible to store and read data only when the starting position of each segment is known in the memory.

To this end, a segment queue is placed in a microcomputer (not shown) to manage information of each segment. Here, the microcomputer controls the writing / reading of data into the memory and the recording / reproducing of data on the optical disc according to the write / read command of the host.

The segment queue is also divided into a plurality of regions, and the number of regions divided in the segment queue corresponds to the number of segments in the memory.

At this time, the memory and the segment queue operate as a ring buffer. That is, when data is stored up to the last address of a memory or segment queue, the data is overwritten and stored in the next first position.

Each region of the segment queue stores a start position of a corresponding segment and a data size stored when data is stored.

For example, if the start position of segment 0 is 100h and the data size to be stored is 500k, 100h and 500k are stored in 0 of the segment queue.

At this time, if the read command or the write command is continuous, the corresponding data is sequentially stored in the segment of the memory. Each region of the segment queue stores a start position and a data size of a segment in which data is stored. In other words, when data is continuously stored in one segment and becomes full, data is continuously stored in the next segment. The data size at this time is the size of the segment. This process continues as long as the read command or the write command is continued.

When a discontinuity occurs in the command, for example, when one read command or a write command is not continuous, or when a read command and a write command occur alternately, the data is moved to the next segment and stored.

That is, in the above case, since the data is stored in the next segment without going overwrite to the beginning of the memory, the data read in advance and stored in the memory are not lost.

If a read / write command transmitted from the host is a read (0) command / lead (1) command / lead (2) command / lead (8) command ... / lead (N) command / write (0) command / Assume the order of read (N + 1) command / lead (N + 3) command.

Then, the data of the position designated by the read (0) command is first read from the optical disk and stored in segment 0 of the memory, and at the same time, the data of the address following the position designated by the read (0) command is read from the disk through the pre-reading operation. Read ahead and store consecutively in segment 0 of memory. When the segment 0 becomes full, data continues to be stored in the next segment, that is, segment 1. It is assumed that this process proceeds up to the read 2 command and then a discontinuous read command, that is, a read 8 command, is transmitted and data is stored up to the middle of segment 2. Then, the start position of segment 2 and the size of the stored data are recorded in the third area of the segment queue in the microcomputer. In this case, the data recorded up to the middle of the segment 2 may include data after the read 2 command read in advance by the pre-reading operation.

At this time, if the data requested by the read 8 command is already stored in the memory through the pre-reading operation, the data stored in the memory is transmitted directly to the host. If it is not stored in the memory, the data of the position designated by the read 8 command is read from the optical disk, stored in the next segment, that is, segment 4, and transmitted to the host.

This process proceeds up to the read (N) command, and then the write (0) command is transmitted. At this time, it is assumed that data is stored up to 1/3 of the segment 8. Then, the start position of segment 8 and the size of data stored in segment 8 are recorded in the ninth region of the segment queue.

The data transmitted with the write command starts to be stored from segment 9 of the memory. The data requested by the next read (N + 1) command is stored from segment 10 and the stored data is transmitted to the host. Next, assuming that a read (N + 3) command is transmitted, if the data requested by the read (N + 3) command is already stored in the memory by a pre-reading operation, the read (N + 3) command requests Data is sent directly to the host.

If it is assumed that the read (5) command is transmitted after the read (N + 3) command, the microcomputer checks whether the data requested by the read (5) command is stored in the memory.

That is, when a discontinuity occurs in the command, since the corresponding data is written to the next segment without overwriting from the beginning of the memory, the data requested by the read 5 command may be stored in the memory.

In this case, the data is read from the disk and the next segment of the memory, for example, segment 11, is not executed, and the segment, for example, segment 2, is read and the data requested by the read (5) command is transferred to the host. Can be.

If the data recorded up to the middle of segment 2 is the data corresponding to the read (4) command, the data requested by the read (5) command is read continuously from the disk from the next position where the data of the segment 2 is recorded and continuously. Can record At this time, the information stored in the third area of the segment queue is updated.

As described above, even when the read command and the write command are alternated or a discontinuity point occurs, the data is moved and stored in the next segment of the memory without overwriting the data again from the beginning, and the information is stored in the corresponding area of the segment queue.

Therefore, the response speed of the optical disc recording / reproducing apparatus does not occur even when the read command and the write command are alternated or a discontinuity point occurs.

As described above, according to the memory operating method and apparatus for an optical disc recorder according to the present invention, the microcom is separately provided with a segment queue for dividing the memory in the optical disc recorder into a plurality of segments and managing information on each segment. If there is a discontinuity in the read / write commands, or if the read / write commands occur alternately, the data is moved to the next segment in memory without storing it from the beginning again, and the information is stored in the corresponding segment queue. By storing in the area, the data read and stored in advance can be protected as much as possible through pre-reading, and the segment queue is read when reading data from memory in order to write data to the optical disk or transfer the data recorded on the disk to the host. Refers to that command The data can be found in memory and sent directly to the host or recorded on an optical disc. As such, the present invention reduces the burden for continuous recording and reproducing of the optical recording and reproducing apparatus, and the optical disc recording and reproducing apparatus can respond to the command of the host without time delay even if the read command and the write command are alternated or a discontinuity point occurs. .

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (5)

A memory operating method of an optical disc recording / reproducing apparatus having a memory for storing data read from a disc in accordance with a read command transmitted from a host, or storing data transmitted with a write command from a host. Dividing the memory into a plurality of areas; If the read or write command is continuous, separately storing information about the area while sequentially writing corresponding data in the area of the memory; And If discontinuity occurs or alternately occurs in the read or write command, storing the data about the immediately previous area and information about the new area separately while recording the corresponding data from the next area of the current recording area. A memory operating method of an optical recorder, characterized in that. The method of claim 1, wherein performing the discontinuous read / write command is performed. If a discontinuity occurs in the read command, checking whether the data requested by the read command is read in advance and stored in a specific area of the memory by referring to information about each separately stored area; Transmitting the corresponding data stored in the specific area to the host when it is determined that the data is stored in the step; If it is determined that the data is not stored in the step, determining whether the data stored in the specific area is the data immediately before the data requested by the read command; Determining whether the specific area is full if the data stored in the specific area is the data immediately before the data requested by the read command; If it is determined in the step that the specific area is not full, reading the data requested by the read command from the disk and storing the data continuously in the specific area; In this step, if the data stored in the specific area is not immediately preceding the data requested by the read command or the specific area is full, the data requested in the read command is read from the disc and the data of the area in which recording is in progress is performed. A method of operating a memory of an optical disc recorder, comprising the step of recording from the next area. The method of claim 1, The information on the separately stored region includes a start position of the region in the memory and a data size recorded in the region. Divided into a plurality of segments and writes data read from the disc to a specific segment according to a read command sent from the host, or writes data transferred with a write command from the host to a specific segment, and writes to the read / write command A memory in the optical disc record player for recording the corresponding data from the next segment of the specific segment currently recording is in progress when discontinuity occurs; And And a memory controller including a segment queue in which the number of divided segments of the memory is divided, and each segment includes a segment queue in which a start position of the segment and a data size stored when data is stored in the segment are recorded. And a memory operating device of the optical disc recorder. The method of claim 4, wherein the memory control unit If a discontinuity occurs in the read / write command transmitted from the host, the data is continuously recorded in a specific segment by referring to the segment start position and data size stored in the segment queue, or from the segment following the segment in which the recording is in progress. And a memory operating device of the optical disc recorder, characterized in that it is controlled to be recorded.