JP2002288928A - Optical disk recording and playback apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and playback apparatus with which the time required for the data read process is reduced in the case the data read process and write process are alternately and repeatedly requested in a short sector unit with respect to continued addresses. SOLUTION: An optical disk recording and playback apparatus 21 is provided with a data read process means and a data write process means and uses the same data buffer for the encode process at the time of data write process and the decode process at the time of data read process. The apparatus 21 is further provided with a single data buffer 10 used for the encode process at the time of data write process and also for the decode process at the time of data read process. The method for using the data buffer is changed by discriminating the continuation states of the data read process and the data write process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording / reproducing information on / from an information recording medium, and more particularly, to a data reading process in a recording / reproducing apparatus in which a buffer memory is used for both data writing and reading. .

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a conventional optical disk recording / reproducing apparatus. The optical disk recording / reproducing apparatus 1 controls an optical disk 2, a disk motor 3 for driving the optical disk 2 to rotate, an optical pickup 4 for scanning a signal recording surface of the optical disk 2, and a rotation speed of the disk motor 3 according to a required speed. A servo circuit 5 for controlling a seek operation or a data read / write operation of the optical pickup 4; and a data decoder / decoder for decoding data read by the optical pickup 4 and encoding write data sent from a host device. Encoder 6 and interface 7 with host device
A CPU 8 for controlling operations of a servo circuit 5 and a decoder / encoder 6 in response to a request from a host device;
And a data buffer 10.

The data read by the optical pickup 4 is supplied from a servo circuit 5 to a data buffer 10 via a data decoder / encoder 6 where the data decoder / data is read.
After the decoding process is performed by the encoder 6, the data is again supplied from the data decoder / encoder 6 to the host device via the interface unit 7.

[0004] Write request data transmitted from a host device such as a computer is supplied from an interface unit 7 to a data buffer 10 via a data decoder / encoder 6, where encoding processing is performed, and then the data decoder / encoder is again processed. 6 is recorded on the optical disk 2 by the optical pickup 5 via the servo circuit 4.

[0005] Commands or data transfer requests from the computer are sent to the CPU 8 via the interface unit 7.
The CPU 8 that has received the data read and write request commands issues a disk motor rotation control command and a seek control command for the optical pickup 2 to the servo circuit 4.

Next, a data reading operation of the conventional optical disk recording / reproducing apparatus 1 will be described with reference to a flowchart shown in FIG.

As shown in FIG. 5, in the data reading operation, a step A1 for judging whether or not data of the sector requested to be read is stored in the data buffer 10.
And step A2 of executing a servo search for the target sector when it is determined in step A1 that no data is stored, step A3 of determining whether the servo search of step A2 has been completed, and data buffering. And step A4 to start data decoding;
Step A5 of making an error determination of the data buffered in step A4, step A6 of transferring the buffered data to a higher-level device, step A7 of determining whether data buffering is currently being performed, and step A7. Step A8 of determining whether or not the buffer is full when it is determined that buffering is being performed;
Step A9 for stopping buffering.

More specifically, it is determined whether or not the data of the sector requested to be read is stored in the data buffer 10 (step A1). If no data is stored, the servo search to the requested sector is performed. It starts (step A2) and monitors the end of this search (step A3). If it is determined in step A3 that the search has been completed, data buffering and data decoding from the target sector are started (step A4), and then an error determination is performed on the buffered data (step A).
5). If it is determined that there is no data error, the data transfer of the requested sector is executed (step A6). If there is an error, the process returns to step A2, and the processing from the servo search is executed again. If data is stored in the data buffer 10 in step A1, the process directly proceeds to step A6 to execute data transfer. After the data transfer, it is determined whether or not data buffering is being executed (step A7). If the buffering is not being performed, the data reading process ends here. If data buffering is being executed, buffer full is monitored (step A8), and if buffer full is determined, data buffering processing is stopped (step A8).
9).

Next, a data writing operation of the conventional optical disk recording / reproducing apparatus 1 will be described with reference to a flowchart shown in FIG. As shown in FIG. 6, the data write operation includes a step B1 for determining whether the data read process is being performed, a step B2 for stopping the data read process when the data is being read, and a process for writing the write request data to the data buffer 10. B3 to start receiving and data encoding of the data buffer 10;
Step B4 of monitoring buffer fullness, step B5 of determining the presence or absence of a write request, step B6 of starting writing of servo data, step B7 of determining the end of reception of all write data, and step B6. And step B8 for determining whether the data writing process has been completed.

More specifically, first, it is determined whether the data reading process (buffering) is currently being executed (step B1), and if so, the data reading process is stopped (step B2). Next, reception of the write request data to the data buffer and data encoding are started (step B3), and the buffer fullness of the received data buffer is monitored (step B4). If the buffer is not full, it is further determined whether there is a buffer writing execution request (step B5). If it is determined in step B4 that the buffer is full, or it is determined in step B5 that there is a buffer writing execution request. If so, data writing is performed (step B6). If it is determined in step B4 that the buffer is not in the buffer full state, and if it is determined in step B5 that there is no buffer write execution request, it is determined whether reception of all write request data has been completed (step B5). B7). Step B7
If it is determined that the reception of all the write data has not been completed, the process returns to step B4 and the subsequent processing is executed again. If it is determined that the reception has been completed, the data writing performed in step B6 is performed. The end of the process is monitored (step B8), and when it is determined that the process has been completed, the data writing ends.

[0011]

The conventional optical disk recording / reproducing apparatus uses the same data buffer for the decoding process when reading data and the encoding process when writing data. The buffer is used for each process of reading and writing. By maximizing the use, each processing efficiency is improved. For this reason, when a file read command and a write command are repeatedly and alternately requested in a short sector unit for continuous addresses by the writer software, for example, when performing a file copy or the like in the same optical disc, the read processing is performed next. All data after the read request sector stored in the buffer until the data is stopped at the time of data reception in the write process is cleared during the write process. For this reason, in the conventional apparatus, the search and buffering processing for the target sector is always executed at the time of the next data reading, and there is a problem that the processing speed is reduced.

An object of the present invention is to provide an optical disk recording / reproducing apparatus which effectively utilizes buffering data at the time of data writing processing and realizes efficient data reading and writing processing.

[0013]

In order to solve the above-mentioned problems, an optical disk recording / reproducing apparatus according to the present invention has a data reading processing means and a data writing processing means, and performs encoding processing and data reading at the time of data writing processing. In an optical disc recording / reproducing apparatus that uses the same data buffer for decoding at the time of processing, means is provided for determining the continuous state of data reading and data writing, and the data buffer is divided according to the result of this determination. It is characterized in that it is configured to be used by using.

According to the present invention, it is determined whether or not the data reading process and the data writing process have occurred continuously, and the data buffer is divided and used. It is possible to efficiently use the data buffer. Therefore, the processing speed can be kept high even when the data reading process and the data writing process are continuous.

In the optical disk recording / reproducing apparatus according to the present invention, the means for judging the continuous state of the data read processing and the data write processing is characterized in that the data read processing is executed immediately before the data read processing to be executed. It is determined whether or not the write process has been executed. If the data write process has been executed, whether or not the address of the read request data to be executed is continuous from the address of the previously read process data Is determined.

According to the present invention, even when the processing efficiency is particularly lowered, for example, when a data read command and a write command are repeatedly and alternately requested for a continuous address in a short sector unit, the data buffer can be used. Is efficiently divided and used in the data reading process and the data writing process, so that the processing efficiency can be maintained high.

Further, in the apparatus of the present invention, the means for judging the continuous state of the data read processing and the data write processing is such that the data write processing is executed immediately before the data read processing to be executed, and When it is determined that the address of the read request data to be executed is continuous from the address of the read processing data performed last time, buffer clear is prohibited in the subsequent data write processing. Further, the means for determining a continuous state of the data reading process and the data writing process determines whether or not the buffer clear is prohibited when performing the data writing process,
When the data buffer is prohibited, the data buffer is divided and used.

With this configuration, during the data writing process, the data buffered in the immediately preceding data reading process is retained without erasing without hindering the data writing process, and the buffer is stored after the data writing process. When there is a duplicate read request for the data stored in the area, operations such as search processing and buffering processing for the target sector required for the read processing can be omitted, so that the processing efficiency can be kept high.

Further, in the optical disk recording / reproducing apparatus of the present invention, when the data buffer is divided and used, the storage size of the data used for the reading process in the data buffer is checked, and the writing process is performed according to the size. It is characterized in that the amount of data buffer used is determined.

In this case, if the storage size of the data used for the reading process in the data buffer is equal to or less than 1/2 of the total buffer size, the buffer size used for the writing data process is set to the size excluding the read data storage area. When the storage size of the data used for the reading process in the data buffer is half or more of the total buffer size, the buffer size used for the writing data process is reduced to the total buffer size. 1 /
It is characterized in that it is reduced to 2 and processed.

By dividing the buffer size in this way, when there is a read request that overlaps with the read data stored in the buffer area after the data write processing, search processing for the target sector necessary for the data read operation can be performed. And data necessary for operations such as buffering processing.

[0022]

Next, an optical disk recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. Figure 1
1 is a schematic configuration diagram showing an embodiment of an optical disk recording / reproducing apparatus of the present invention. The optical disk recording / reproducing apparatus 21 according to the embodiment of the present invention shown in FIG. 1 is different from the conventional apparatus in the read processing and the write control of the target sector, and the operation of the CPU 22 is different from that of the conventional CPU 8. The overall configuration of the hardware is almost the same as that of the conventional optical disc recording / reproducing apparatus 1.

As will be described in detail below, the data write process and the data read process of the CPU 22 are controlled by dividing the same data buffer used for each process depending on the situation. The operation is defined so that the time required for the data reading process in the case where a request is made repeatedly and alternately in consecutive units in a short sector unit is reduced, and the data reading process after the data writing is performed efficiently.

FIG. 2 is a flowchart for explaining the target sector read processing control by the CPU 22 shown in FIG.

In the read processing control, as shown in FIG. 2, a step A for judging whether or not data has just been written is determined.
10, a step A11 for determining whether the start address of the read request sector is continuous from the last read request sector address in the previous read processing, a step A12 for requesting prohibition of clearing the read data buffer at the time of writing, and Step A13 for requesting permission to clear the read data buffer at the time, Step A1 for determining whether data of the sector requested to be read is stored in the data buffer, and when it is determined in Step A1 that data is not stored Step A2 of executing a servo search for the target sector, Step A3 of determining whether the servo search of Step A2 has been completed, Step A4 of starting data buffering and data decoding, and an error of the buffered data. Perform judgment And step A5, step A6 to transfer the buffered data to the host computer
Step A7 for determining whether data buffering is currently being performed, and Step A8 for determining whether the buffer is full when it is determined that buffering is being performed in Step A7, and a step for stopping buffering. A9. The operations in steps A1 to A9 are the same as those in the conventional optical disk recording / reproducing apparatus described with reference to FIG.

Specifically, it is determined whether or not the data write processing has been executed immediately before the data read processing to be executed (step A10). If the write processing has been executed, the start address of the read request sector is changed to the start address. It is determined whether or not the data is continuous from the previous read processing (step A11). If the data is continuous, a request to prohibit clearing of the read data buffer at the time of the write processing is requested (step A12). Request buffer clear permission (step A1)
3). Next, it is determined whether the data of the sector requested to be read is stored in the data buffer (step A1). If it is determined in step A10 that the data writing process has not been executed immediately before, the process directly proceeds to step A1.

If no data is stored in the buffer in step A1, a servo search for the requested sector is started (step A2), and the end of this search is monitored (step A3). If it is determined in step A3 that the search has been completed, data buffering and data decoding from the target sector are started (step A4), and then an error determination is performed on the buffered data (step A5). If it is determined that there is no data error, the data transfer of the requested sector is executed (step A).
6) If there is an error, the flow returns to step A2, and the processing from the servo search is executed again. Step A
If it is determined in step 1 that data is stored in the data buffer 10, the process proceeds to step A6 to execute data transfer. After the data transfer, it is determined whether or not data buffering is being executed (step A7). If the buffering is not being performed, the data reading process ends here. If data buffering is being executed, buffer full is monitored (step A8), and if buffer full is determined, data buffering processing is stopped (step A9).

FIG. 3 is a flowchart for explaining target sector write processing control by the CPU 22 of the optical disk recording / reproducing apparatus of the present invention. As shown in FIG.
The data write control operation of the CPU 22 includes a step B1 of determining whether data read processing is currently being performed.
Step B2 of stopping the data reading process when the data is being read, Step B10 of determining whether the prohibition of clearing of the data buffer storing the read data is requested, and setting the read data storage buffer size to Step 11 for checking, Step B12 for reducing the write data processing buffer to a size excluding the read data storage area, and Step B13 for reducing the size of the write data processing buffer by バ ッ フ ァ.
A step B14 of permitting clearing of the data buffer storing the read data, a step B3 of starting the reception of the write request data to the data buffer and starting the data encoding, and a step B4 of monitoring the buffer full of the data buffer. Step B5 of judging the presence or absence of a write request, Step B6 of starting writing of servo data, Step B7 of judging the end of reception of all write data, and whether the data write processing executed in Step B6 has ended Is determined in step B8. The operations in steps B1 to B8 are the same as the operations of the conventional optical disk recording / reproducing apparatus described with reference to FIG.

More specifically, first, it is determined whether or not the data reading process (buffering) is currently being executed (step B1), and if so, the data reading process is stopped (step B2). Next, it is determined whether or not the prohibition of clearing the data buffer storing the read data is requested (step B10). If the prohibition is requested, the size of the buffer in which the data is stored is checked by the read process (step B11). If the buffer size is equal to or smaller than 1/2 of the total buffer size, the write data processing buffer size is reduced to a size excluding the read data storage area (step B12).
If it is not less than / 2, the write data processing buffer size is reduced to 1/2 (step B13), and clearing of the read data storage area at the next write processing is permitted (step B14). Next, reception of the write request data to the data buffer and data encoding are started (step B3), and the buffer fullness of the received data buffer is monitored (step B4). If the buffer is not full, it is further determined whether there is a buffer writing execution request (step B5). If it is determined in step B4 that the buffer is full, or it is determined in step B5 that there is a buffer writing execution request. If so, data writing is performed (step B6). Step B
If it is determined in step 4 that the buffer is not full, and if it is determined in step B5 that there is no buffer write execution request, it is determined whether reception of all write request data has been completed (step B7). If it is determined in step B7 that the reception of all the write data has not been completed, the process returns to step B4 and the subsequent processing is executed again.
If it is determined that the reception has been completed, step B6
The end of the data writing process executed in step (1) is monitored (step B8), and when it is determined that the data writing process is ended, the data writing is ended.

As described above, in the optical disk recording / reproducing apparatus according to the embodiment of the present invention, as shown in FIGS.
During data write processing, the buffered data in the immediately preceding data read processing is not erased depending on the situation, so that when a read request for data stored in this buffer area is made after data write processing, search processing and buffering for the target sector are performed. The time required for ring processing and the like can be reduced.

[0031]

As described above, according to the optical disk recording / reproducing apparatus of the present invention, it is possible to perform a processing such that a data read command and a write command are alternately and repeatedly requested in a short sector unit for continuous addresses. Even when the efficiency is particularly low, the data buffer is efficiently divided and used for the data reading process and the data writing process, so that the time required for the data reading process can be reduced, and the data reading process after the data writing is performed. It can be done efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention.

FIG. 2 is a flowchart illustrating data read processing control according to the present invention.

FIG. 3 is a flowchart illustrating data write processing control according to the present invention.

FIG. 4 is a schematic configuration diagram showing an example of a conventional optical disk recording / reproducing apparatus.

FIG. 5 is a flowchart for explaining conventional data read processing control.

FIG. 6 is a flowchart for explaining conventional data write processing control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk recording / reproducing apparatus 2 Optical disk 3 Disk motor 4 Servo circuit 5 Pickup 6 Data decoder 7 Host I / F 8 CPU 9 Power supply 10 Data buffer 21 Optical disk recording / reproducing apparatus 22 CPU

Claims (7)

[Claims] 1. An optical disk recording / reproducing apparatus comprising a data reading processing means and a data writing processing means, wherein the same data buffer is used for encoding processing at the time of data writing processing and decoding processing at the time of data reading processing. An optical disk recording / reproducing apparatus, comprising means for determining a continuous state of a reading process and a data writing process, and dividing and using the data buffer according to a result of the determination. 2. An optical disk recording / reproducing apparatus according to claim 1, wherein said means for judging a continuous state of said data read processing and data write processing is a data read processing to be executed when said data read processing is executed. It is determined whether or not the data write processing has been executed immediately before, and if the data write processing has been executed, the address of the read request data to be executed is consecutive from the address of the previous read processing data. An optical disc recording / reproducing apparatus for determining whether or not the optical disc is being played. 3. The optical disk recording / reproducing apparatus according to claim 2, wherein said means for judging a continuous state of the data reading process and the data writing process executes the data writing process immediately before the data reading process to be executed. If it is determined that the address of the read request data to be executed is continuous from the address of the previous read processing data, the buffer clear is prohibited in the subsequent data write processing. An optical disk recording / reproducing apparatus characterized by the above-mentioned. 4. The optical disk recording / reproducing apparatus according to claim 3, wherein said means for judging a continuous state of said data reading process and said data writing process is configured to determine whether or not said buffer clear is prohibited when performing said data writing process. An optical disk recording / reproducing apparatus characterized in that the data buffer is divided and used when prohibited. 5. The optical disk recording / reproducing apparatus according to claim 4, wherein when the data buffer is divided and used, a storage size of data used for a reading process in the data buffer is checked, and the size is determined. An optical disc recording / reproducing apparatus characterized in that a usage amount of a data buffer for write processing data is determined in accordance therewith. 6. The optical disk recording / reproducing apparatus according to claim 5, wherein the storage size of data used for reading processing in the data buffer is １ ／ of the total buffer size.
In the following cases, an optical disk recording / reproducing apparatus characterized in that a buffer size used for write data processing is reduced to a size excluding a read data storage area and used. 7. The optical disk recording / reproducing apparatus according to claim 5, wherein a storage size of data used for reading processing in the data buffer is の of a total buffer size.
In the above case, an optical disk recording / reproducing apparatus characterized in that a buffer size used for write data processing is reduced to half of the total buffer size for processing.