JPH03130969A - Optical disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To suppress a synchronization discrepancy and to promote transfer performance by recording and reproducing a data in parallel by plural recording and reproducing means after confirming that the retrieval of all objective tracks is completed by plural retrieval means. CONSTITUTION:When a data is recorded, an address 40 of a sector to be recorded is sent by a control CPU 14 to sector control circuits of recording and reproducing parts 24-27 of drives 28-31 to have objective tracks retrieved. Then, when retrieval completion signals 42 are sent out of all the drives, addresses 47-50 on a buffer memory 15 of the coded data are assigned in sector unit by the CPU 14 to data modulation and demodulation circuits 16-19 to start modulating the data. A laser of an optical head is driven by the recording and reproducing parts 24-27 in accordance with the modulated data to record the data on an optical disk. Thus, by recording and reproducing the data in parallel by plural recording and reproducing means, the transfer performance is promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to external storage devices such as computers, and in particular relates to an optical disk recording and reproducing device that records and reproduces information on an optical disk using a semiconductor laser. Optical disc recording and reproducing apparatuses that narrow the irradiation light from a semiconductor laser to about 1 μm and record and reproduce data on an optical disc at high density have been attracting attention in recent years.

Figure 34 shows an overview of a conventional optical disc recording and reproducing device. Optical head composed of semiconductor laser, etc.
3 is a disk modulator that rotates the optical disk l; 4 is a data modulation demodulator that demodulates error-correction encoded data; or data modulation and demodulation that demodulates playback data reproduced from the optical disk 1; 6 is a control CPU that controls the entire optical disc recording and reproducing device, and 7 is a laser drive head amplifier that drives a semiconductor laser and amplifies the reproduction signal.
8 is a focus control time v! that focuses the laser beam on the recording surface of the optical disc l! &, 9 is the laser beam to the optical disc 1
The operation of the conventional optical disc recording and reproducing apparatus configured as described above with a tracking control circuit that follows the track of the optical disc will be explained below.
This section explains how to record data. The control CPU 6 sends the address 10 of the sector to be recorded to the sector control circuit 5, and the sector control circuit 5 controls the tracking control circuit 9 to search for the target track.Next, the sector sent from the laser drive head amplifier circuit 7 The address 11 of the target sector is compared with the address IO of the target sector, and if a match is detected, the data modulation/demodulation circuit 4 is activated and data modulation begins. In response to this, the semiconductor laser of the optical head 2 is driven to form recording pits on the recording surface of the optical disk l.When data is recorded and then reproduced, the target sector is set as in the case of recording. The fine sector control circuit 5 that retrieved the data modulation/demodulation circuit 4 activates the data modulation/demodulation circuit 4 and starts the demodulation operation.
demodulates the binarized playback data 13 sent from
As described above, in conventional optical disc recording and reproducing devices,
The control CPU 6 can record and reproduce data by specifying the address of the target sector.Problems to be Solved by the Invention Engineering Workstation (EWS)
Advances in information processing devices such as personal computers have been remarkable, and although their information processing capabilities have improved dramatically, there are also demands on the external storage devices connected to these information processing devices in order to maximize this ability. Although the ability to store data has become even higher, one of the most important requirements for external storage devices is the improvement in transfer speed, which has a large impact on the speed at which data can be output. Ei Inuyo In optical disk recording and reproducing devices, which are characterized by convertibility, a higher transfer capacity is required. Due to the limitations of the output power of semiconductor lasers and the limitations of recording sensitivity of recording media, it is difficult to record and reproduce data on optical discs (Table 1).
It is said that the rotational speed of approximately 500 m is the limit, and even though the recording density has reached a plateau due to the wavelength limit of semiconductor lasers, it has become difficult to significantly increase the transfer capacity of optical disk recording and reproducing devices beyond the current level. In view of this problem, the present invention aims to provide an optical disc recording and reproducing device that can realize higher transfer performance. Means for Solving the Problems An optical disk recording and reproducing apparatus of the present invention includes a plurality of search means for searching for a target track of an optical disk having a sector structure divided into tracks and sectors, and a plurality of search means for recording and reproducing data in the sectors. A drive block having a recording and reproducing means, a plurality of encoding means for error detection and correction, a plurality of decoding means, and a plurality of data modulation and demodulation means, and recording and reproducing of data in parallel by the plurality of recording and reproducing means of the drive block. As one preferred embodiment of the present invention, the present invention includes the drive block, a storage means for storing data transferred from the host or reproduced by the drive block;
During recording and playback, the drive includes synchronization means for starting a recording or playback operation in the drive block after confirming that the search for all target tracks has been completed by the plurality of search means in the drive block. In another preferred embodiment of the present invention, the present invention provides an optical disc recording and reproducing apparatus characterized in that data is recorded and reproduced in parallel in synchronized blocks. An optical disc recording/playback device connected by multiple drive interfaces for transferring playback data,
The drive control circuit includes: a plurality of drive interface control means for transmitting and receiving data to and from the drive block via the plurality of drive interfaces;
storage means for storing recorded or reproduced data; host interface control means for transferring data with the host computer via the host interface; and each interface connected to each of the plurality of drive interface means and the host interface control means. Multiple FIFs that temporarily store data sent and received via
O memory, and DMA control means for performing DMA transfer between each of the plurality of FIFO memories and the storage means, and cyclically switches a DMA channel corresponding to each of the FIFO memories. In another preferred embodiment of the present invention, there is provided an optical disc recording and reproducing apparatus characterized in that the drive blocks record and reproduce data in parallel. An optical disc recording/playback device connected by multiple drive interfaces for data transfer,
The drive control circuit includes: a plurality of drive interface control means for transmitting and receiving data to and from the drive block via the plurality of drive interfaces;
a plurality of storage means for storing data transmitted and received via each of the drive interfaces, a host interface control means for transferring data to and from a host computer via the host interface, each of the plurality of storage means and the host interface control means; DMA control means for performing DMA transfer between the means; and a plurality of dual ports for switching access to each of the plurality of storage means to either access from the DMA control means or access from the drive interface control means. control means, and performs DMA transfer between one of the plurality of storage means and the host interface control means, and at the same time transfers data between another of the plurality of storage means and the plurality of drive interface control means. The present invention is also applicable to an optical disc recording and reproducing apparatus characterized in that data is recorded and reproduced in parallel in the drive blocks by performing data transfer. By starting recording and reproducing data in parallel with multiple recording and reproducing means after confirming that the data has been completed, the synchronization deviation of each of the plurality of recording and reproducing means can be minimized to the maximum.
By keeping the memory required for synchronization to a small amount, data can be recorded and played back in parallel with less hardware.
In addition, the present invention provides a system for recording and reproducing data in parallel using a plurality of recording and reproducing means. Each FI
The data stored in the FO memory is transferred to and from the storage device at high speed by switching the DMA channels one after another.This enables high-speed data transfer between the drive block and the host computer, achieving high transfer capacity. According to the present invention, with the above-described configuration, when recording and reproducing data in parallel with a plurality of recording and reproducing means, a plurality of dual port control means can control communication between a host interface control means and one storage means. Even when performing DMA transfer, it is possible to transfer data to and from the drive block for other storage means, enabling high-speed data transfer between the drive block and the host computer, achieving high transfer capacity. Embodiments The optical disc recording and reproducing apparatus of the present invention will be described below with reference to the drawings, but FIG. 1 shows a block diagram of the optical disc recording and reproducing apparatus of the first embodiment of the present invention. In FIG. 1, 14 is a control CPU that is composed of a microprocessor or the like and controls the entire optical disc recording/reproducing device; 15 is a buffer memory that is composed of a semiconductor memory that temporarily stores data to be recorded or reproduced; 16, 17, 18; 19 is a data modulation/demodulation circuit i that demodulates error detection/correction coded data into digital format or reproduced data 20.21.
22 and 23 are encoding/decoding circuits ji and 24, 25, 26, and 27 for encoding data for error detection and correction or error detection and correction of demodulated data; and recording and reproducing units 24, 25, 26, and 27 for recording and reproducing data.

In the optical disc recording and reproducing apparatus of the first embodiment of the present invention configured as described above, 4 & 4 optical disc drives are connected, and in FIG.
Although 8, 29, 30.31 indicate each optical disk drive, FIG. 2 shows the recording and reproducing units 24, 25, 26.
27, in FIG. 2, 32 is an optical disk that is divided into tracks and sectors and data is recorded or reproduced in sector units; 33 is a disk drive that rotates the optical disk 32; 34 is a semiconductor laser, etc. A light head consisting of
Reference numeral 35 indicates a laser drive head amplifier opening for driving the semiconductor laser and amplifying the reproduced signal. Reference numeral 36 indicates a focus control arrangement for focusing the laser beam on the recording surface of the optical disc 32. Reference numeral 37 indicates a tracking arrangement for causing the laser light to follow the tracks of the optical disc 32. The control section 38 is a sector control circuit that performs timing control for the sector to be recorded and reproduced.The operation of the optical disc recording and reproducing apparatus according to the first embodiment of the present invention constructed as described above will be explained below. The case of recording data on the optical disc 32 will be explained. User data 39 is stored in the buffer memory 15 via the host interface.
14 sends the track address 40 of the sector to be recorded to the sector control circuit 38 of each of drives 1 to 4. The sector control circuit 38 of each drive gives the address 41 of the target track to the tracking control circuit 37 to search for the target track. The tracking control circuit 37 drives a linear motor etc. to search for the target track.The sector control circuit 38 compares the address of the track reproduced from the laser drive head amplifier circuit 35 with the address of the target track. When a match is detected, the control CPU 14 sends a search completion signal 42 to the control CPU 4. The control CPU 14 sends the addresses 43, 44, 45 of the buffer memory 15 to the encoding/decoding circuits 20, 21, 22, and 23 of each drive 1 to 4. .46 is 4 circles User data 39 is encoded and decoded by each drive's encoding/decoding circuit 20. 2
1. The encoding/decoding circuits 20, 21, 22, and 23 encode user data for error detection and correction.

When the search completion signal 42 is sent from all the drives, the control CPU 14 instructs each drive to record data.
, 17, 18, 19, addresses 47, 48, 49, 50 on the buffer memory 15 of encoded data
4 circles Each data modulation/demodulation circuit 16, 17 in sector units
, 18.19 The control CPU 14 also gives the address 51 of the sector to be recorded to the sector control circuit 38 of each drive. The reproduced addresses 52 are compared, and if a match is detected, each data modulation/demodulation circuit 16, 17, 18,
19, each data modulation/demodulation circuit 16, 17, 18, 19 starts data modulation, and the semiconductor laser is driven according to the modulated data, and the data is transferred to the optical disk 32. The control CPU 14 controls each optical disk drive 28, 2.
9. 30. 31 encoding/decoding circuits 20, 21, 22
, 23, and data modulation and demodulation circuits 16, 17, 18,
19, when allocating an area of the buffer memory 15 in sectors, the control CPU 4 controls the encoding/decoding circuits 20 and 21.
, 22, 23, and data modulation/demodulation circuits 16, 17,
18 and 19, the address of the buffer memory 15 is l.
Addresses 43, 44, 45, 46 and 47 . are shifted by the capacity of the sector. 48. 49. 50 set L, then each encoding composite circuit 20. 21. 22
゜23, and data modulation and demodulation circuits 16, 17, 18,
Each encoding/decoding circuit 20, 21, 22
．． 23, and data modulation and demodulation circuits 16, 17, 18
, 11, set address 43° 44, 45.
46 and 47. 48. 49. The initial value is 50, and the address is incremented sequentially.
Different areas of the buffer memory 15 can be accessed in sector units.

FIG. 3 shows a flowchart illustrating the synchronization process for each drive in the control CPU 14 for the above recording operation. In FIG. 3, a indicates that the control CPU 14 instructs each drive to search for a target track.

b waits until the search completion signal 42 is sent from the sector control circuits 38 of all drives; C waits until the search completion signal 42 is sent from the sector control circuits 38 of all drives; The address 51 of the sector to be recorded is set to 6 circles.Instructing to record data is done, but d is no longer available.For each drive that has finished recording in the sector, there is no more data to be recorded.Sequentially give commands to record data. .

FIGS. 4 to 13 are memory map diagrams illustrating the contents of the Q buffer memory 15 when performing the above-described synchronization processing and continuously recording data.

In Figure 4 (top) 1 track = 8 sectors Number of drives =
In the example of 4, even if the buffer memory 15 is configured with a memory with a storage capacity of 40 sectors, 4.
:, (a) Internal meaning of the buffer memory (b) At time t, the position of the head in each drive at that time (Fig. 4 (a), (b)), the position of the head in each drive at that time. When the search completion signal 42 is sent from each drive, the head of each drive will move to sector 0 of track n. 5 and 4.7, and even though a recording command is issued to each drive, (a) error correction encoding processing is also performed on the data from DO to D3 on the buffer memory, and the data from D4 to D7 is Even if the data is transferred from the host, at time t1 (Fig. 5 (a), (b)) (b
) The head of each drive is in sectors 11 and 6 of track n.
, 5.0, and even if drive 4 records encoded data D3 in sector 0, (a) data D8 to D
Even if data ll is transferred from the host and error correction encoding is performed on data D4 to D7, and even if D3 shown with diagonal lines is recorded by drive 4, at time t2 (Fig. 6(a), ( b)), (
b) The heads of each drive read sectors 2, 7, and 7 of track n.
6, l, and drive 4 records encoded data D7 in sector 1.

(a) Data D12 to D15 are transferred from the host.
Even if error correction encoding is performed on the data D8 to Dll, and even if the shaded D7 is recorded by the drive 4, at time ts (Fig. 7(a), (b)), (
b) The head of each drive is in sector 3, O of track n.
l 7.2, and even if drive 2.4 records encoded data DLDII in sectors 0 and 2, (a) data D16 to D19 are transferred from the host.
Even if error correction encoding is performed on the data D12 to D15, and even if the diagonally shaded D1°Dll is recorded by the drive 2.4, from time t4 to ty (Fig. 8 (a), (b) to Figure 11 (a),
(b)), Even if the same processing as above is performed, at time t- (Fig. 12 (a), (b)),
(b) The head of each drive is in sectors 0 and 5 of track n.
．． 4.7, and data Do encoded in sectors O15, 4, and 7 in drives l, 2, and 3.4, respectively.
% Even if D21, D18, and D31 are recorded, (a) data D36 to D39 are not transferred from the host.
Even if error correction encoding is performed on data D32 to D35, DO1D21, D18 shown with diagonal lines,
Even if D31 is recorded by drives 1, 2, and 3.4, at time t. (Fig. 12(a), (b)),
(b) The head of each drive is sector 1.6 of track n.
．． 5, and is in sector 0 of track (n+1),
Even if drives 1, 2, and 3.4 record encoded data D4, D25, D22, and D35 in sectors 1.6 and 5 of track n, and sector 0 of track (n+1), respectively, (a) DO Data from D4 to D4 has already been recorded by each drive. Even if data D40 to D43 transferred from the host are recorded in this area, and error correction encoding is performed on data D36 to D39, the diagonal lines also indicate D4, D25, D22, D shown
Even if 35 is recorded by drives 1.2 and 3.4, by using at least 40 sectors of buffer memory, data can be transferred continuously at a rate four times faster than the transfer rate of a single drive. Next, the case of reproducing data from the optical disc 32 will be explained.

1st [! l and in FIG. 2, the control CPU 4
sends the track address 40 of the sector to be reproduced to the sector control circuit 38 of each of drives 1 to 4. The sector control circuit 38 of each drive sends the address 41 of the target track to the tracking control circuit 37 in 4 circles. Search for the target track. command.

Here, the sector control circuit 38 compares the address of the track reproduced from the laser drive head amplifier circuit 35 with the address of the target track, and when a match is detected, sends a search completion signal 42 to the control CPU 14. When 42 is sent from all drives, it commands each drive to reproduce data.Control CPU 4 is data modulation and demodulation circuit 1
6, 17, 18, and 19, addresses 47 and 48 indicate the storage location of the demodulated data on the buffer memory 15.
．． 49, 50 can be assigned to each data modulation/demodulation circuit 16, 17, 18, 19 in 4-circle sector units.
The PU 14 gives the address 51 of the sector to be reproduced to the sector control circuit 38 of each drive, but the sector control circuit 38 gives the address 51 of the sector to be reproduced.
and the address 52 reproduced from the laser drive head amplifier circuit 35, and if a match is detected, a start signal 53, 54, 55, 56 is sent to each data modulation/demodulation circuit 16, 17, 18, 19. Each of the data modulation and demodulation circuits 16, 17, 18, and 19 demodulates the playback data sent out from the laser drive head amplifier circuit 35 and stores it in the buffer memory.
14 instructs each encoding/decoding circuit 20, 21, 22.23 to decode the address 43, 44, 45.46 on the buffer memory 15 in four circles.
The data for which error correction processing has been completed in steps 21, 22, and 23 is sent to the host via the host interface. In FIG. 14, a indicates the control CPU 14 instructs each drive to search for the target track, b indicates the sector control circuit 38 of all drives, or indicates the sector control circuit 38 of all drives.

Claims (7)

[Claims] (1) A plurality of search means for searching for a target track of an optical disc having a sector structure divided into tracks and sectors, a plurality of recording and reproducing means for recording and reproducing data in the sectors, and a plurality of encoding units for error detection and correction. a drive block having a plurality of decoding means and a plurality of data modulation/demodulation means; a storage means for storing data transferred from a host or reproduced by the drive block; and a storage means for storing data transferred from a host or reproduced by the drive block; and a synchronizing means for starting a recording or reproducing operation in the drive block after confirming that the search for all target tracks has been completed by the plurality of search means, and recording and reproducing data in parallel in synchronization in the drive block. An optical disc recording and reproducing device characterized by performing the following. (2) An optical disc recording and reproducing device in which a drive block for recording and reproducing data and a drive control circuit for controlling the drive block are connected through a plurality of drive interfaces, and the drive block has a sector structure divided into tracks and sectors. a plurality of search means for searching for a target track of an optical disc having a plurality of discs; a plurality of recording and reproducing means for recording and reproducing data in the sectors; a plurality of encoding means and a plurality of decoding means for error detection and correction; The drive comprises a data modulation/demodulation means, a plurality of storage means for storing recorded or reproduced data, and a plurality of drive interface control means for transmitting and receiving data to and from the drive control circuit via the plurality of drive interfaces. The control circuit includes a plurality of drive interface control means for transmitting and receiving data to and from the drive block via the plurality of drive interfaces, a storage means for storing recorded or reproduced data, and a host computer and data exchanger via the host interface. a host interface control means for performing transfer; and a plurality of FIFOs connected to each of the plurality of drive interface means and the host interface control means and temporarily storing data to be transmitted and received via each interface.
and a DMA control means for performing DMA transfer between each of the plurality of FIFO memories and the storage means, and cyclically switching a DMA channel corresponding to each of the FIFO memories. An optical disc recording and reproducing apparatus characterized in that the drive blocks record and reproduce data in parallel. (3) An optical disc recording and reproducing device in which a drive block for recording and reproducing data and a drive control circuit for controlling the drive block are connected through a plurality of drive interfaces, and the drive block has a sector structure divided into tracks and sectors. a plurality of search means for searching for a target track of an optical disc having a plurality of discs; a plurality of recording and reproducing means for recording and reproducing data in the sectors; a plurality of encoding means and a plurality of decoding means for error detection and correction; The drive comprises a data modulation/demodulation means, a plurality of storage means for storing recorded or reproduced data, and a plurality of drive interface control means for transmitting and receiving data to and from the drive control circuit via the plurality of drive interfaces. The control circuit includes a plurality of drive interface control means for transmitting and receiving data to and from the drive block via the plurality of drive interfaces, a storage means for storing recorded or reproduced data, and a host computer and data exchanger via the host interface. a host interface control means for performing transfer; and a plurality of FIs connected to each of the plurality of drive interface control means and the host interface control means and temporarily storing data transmitted and received via each interface.
Confirming that the search for all target tracks has been completed by the FO memory, the DMA control means for performing DMA transfer between each of the plurality of FIFO memories and the storage means, and the plurality of search means for the drive block. and a synchronizing means for starting a recording or reproducing operation in the drive block, and by cyclically switching the DMA channel corresponding to each of the FIFO memories, the drive block synchronizes and performs the playback operation in parallel. An optical disc recording and reproducing device characterized by recording and reproducing data. (4) An optical disc recording and reproducing device in which a drive block for recording and reproducing data and a drive control circuit for controlling the drive block are connected through a plurality of drive interfaces, and the drive block has a sector structure divided into tracks and sectors. a plurality of search means for searching for a target track of an optical disc having a plurality of discs; a plurality of recording and reproducing means for recording and reproducing data in the sectors; a plurality of encoding means and a plurality of decoding means for error detection and correction; The drive comprises a data modulation/demodulation means, a plurality of storage means for storing recorded or reproduced data, and a plurality of drive interface control means for transmitting and receiving data to and from the drive control circuit via the plurality of drive interfaces. The control circuit includes a plurality of drive interface control means for transmitting and receiving data to and from the drive block via the plurality of drive interfaces, a plurality of storage means for storing data to be transmitted and received via each of the drive interfaces, and a host. a host interface control means for performing data transfer with a host computer via an interface; a DMA control means for performing DMA transfer between each of the plurality of storage means and the host interface control means; and a plurality of dual port control means for switching between access from the drive interface control means and access from the drive interface control means, and at the same time performing DMA transfer between one of the plurality of storage means and the host interface control means; An optical disc recording and reproducing apparatus characterized in that data is recorded and reproduced in parallel in the drive block by transferring data between the other plurality of storage means and the plurality of drive interface control means. (5) An optical disc recording and reproducing device in which a drive block for recording and reproducing data and a drive control circuit for controlling the drive block are connected through a plurality of drive interfaces, and the drive block has a sector structure divided into tracks and sectors. a plurality of search means for searching for a target track of an optical disc having a plurality of discs; a plurality of recording and reproducing means for recording and reproducing data in the sectors; a plurality of encoding means and a plurality of decoding means for error detection and correction; The drive comprises a data modulation/demodulation means, a plurality of storage means for storing recorded or reproduced data, and a plurality of drive interface control means for transmitting and receiving data to and from the drive control circuit via the plurality of drive interfaces. The control circuit includes a plurality of drive interface control means for transmitting and receiving data to and from the drive block via the plurality of drive interfaces, a plurality of storage means for storing data to be transmitted and received via each of the drive interfaces, and a host. a host interface control means for performing data transfer with a host computer via an interface; a DMA control means for performing DMA transfer between each of the plurality of storage means and the host interface control means; a plurality of dual port control means for switching between access from the drive interface control means and access from the drive interface control means, and a plurality of search means for the drive block after confirming that searches for all target tracks have been completed; or a synchronizing means for starting a playback operation, and simultaneously performs DMA transfer between one of the plurality of storage means and the host interface control means, and synchronizing the other of the plurality of storage means and the plurality of storage means. An optical disc recording and reproducing device characterized in that data is recorded and reproduced in parallel in synchronization in the drive blocks by transferring data between drive interface control means. (6) The drive block includes a search means for searching for a target track of an optical disk having a sector structure divided into tracks and sectors, a recording/reproducing means for recording and reproducing data in the sectors, and a code for error detection and correction. 2. The optical disc recording and reproducing apparatus according to claim 1, comprising a plurality of optical disc drives having encoding means, decoding means, and data modulation/demodulation means. (7) The drive block includes a search means for searching a target track of an optical disk having a sector structure divided into tracks and sectors, a recording/reproducing means for recording and reproducing data in the sector, and a code for error detection and correction. Claims 2 and 3, characterized in that the optical disk drive comprises a plurality of optical disk drives each having encoding means and decoding means, data modulation/demodulation means, storage means for storing recorded or reproduced data, and drive interface control means. 4
, or the optical disc recording and reproducing device according to 5.