WO2016135887A1

WO2016135887A1 - Disc device

Info

Publication number: WO2016135887A1
Application number: PCT/JP2015/055418
Authority: WO
Inventors: 公一朗西山
Original assignee: 三菱電機株式会社
Priority date: 2015-02-25
Filing date: 2015-02-25
Publication date: 2016-09-01
Also published as: JP6293358B2; JPWO2016135887A1

Abstract

A front end (FE) unit manages, as disc replaced/non-replaced information, whether a disc is replaced or not during a period from a time when start-up of the FE unit is completed to a time when start-up of a back end (BE) unit is completed. The BE unit stores identification information in an identification information storage unit, i.e., nonvolatile memory, said identification information being included in data the FE unit has read out from the disc. In the case where, upon start-up completion of the BE unit, the disc replaced/non-replaced information indicates that the disc has not been replaced, the BE unit performs reproduction processing of the disc using the identification information stored in the identification information storage unit.

Description

Disk unit

The present invention relates to a disk device that reads and reproduces data from a disk.

When a conventional disk device starts playing a disk immediately after the power is turned on from the off state, does the disk identification information always be read from the disk each time and continuously played from the position where the disk was interrupted? Or, it was determined whether or not playback from the top of the disc was performed, and playback processing was executed.

In the following, the operation of playing a disc immediately after the power is turned on from the off state is called “start-up playback”. Further, continuous playback from the playback interruption position is called “resume playback”, and playback from the top data of the disc is called “first play”.

Since the disk device must read all identification information from the disk at the time of start-up reproduction, for example, when reproducing a disk in which a large number of files (for example, 2000 files) compressed by a method such as MP3 or JPEG are stored. It took tens of seconds to read the identification information, and it took time to start playback.

The reason why it is necessary to read the identification information from the disk every time playback is started is derived from the AnyTimeEJECT of the disk device. AnyTimeEJECT is a function that, when a disk ejection request is input while the power is off or before startup is completed, ejects the disk as soon as the disk device is activated.

In a disk device that employs a front loading mechanism in which the operation of pulling the disk inside the housing and the operation of ejecting it out of the housing is performed on the front surface of the housing, like in-vehicle audio, the front end part draws in, ejects, and data the disk. Reading is performed, and the data read by the back-end unit at the front-end unit is reproduced. When AnyTimeEJECT is executed in this disk device, the OS is not installed or a small-scale OS is installed within 10 seconds after the back-end unit equipped with the OS (Operating System) is completed. The front end unit can start up in about 1 second to complete the ejection of the disc and the pull-in of the new disc. For this reason, when the back-end unit completes startup, the back-end unit cannot determine whether the disk in the front-end unit remains as the disk when the power is turned off or has been replaced with a new disk.

In this way, the back-end unit does not have a means for determining whether or not the front-end unit has been replaced before completion of the start-up of the back-end unit. It was necessary to determine whether the disk in the end part remained as it was when the power was turned off or was replaced with a new disk. Therefore, the longer the time for reading the identification information from the disc, the later the start of reproduction.
Therefore, in order to shorten the time required for start-up reproduction, techniques such as Patent Documents 1 and 2 have been proposed.

JP 2006-294237 A JP 2010-231871 A

The disk device according to Patent Document 1 includes an insertion / removal detection unit that detects insertion / removal of a disk from power-off to power-on, and reads all management information stored in the disk when the disk insertion / removal is detected. In this configuration, the first mode is selected, and when the insertion / extraction of the disk is not detected, the second mode for reading out only a part of the management information is selected. When the second mode is selected, it is possible to shorten the time required from the power-on to the start of reproduction. However, even if either the first mode or the second mode is selected, the management information needs to be read from the disk, so that the time reduction effect is limited.

The optical disc playback apparatus according to Patent Document 2 stores discrimination information indicating a disc whose playback has been interrupted when the power is turned off in a decoder on the back end side. Then, when the reactivation after the playback interruption is completed, the front-end drive reads the identification information from the disc, and the back-end decoder compares the identification information with the discrimination information, before and after the reproduction interruption. In this configuration, the presence / absence of disk replacement is determined. In this configuration, it is not necessary to detect the insertion / extraction of the disk on the front end side, and it is possible to determine whether or not the disk is replaced only by the decoder on the back end side. However, since it is necessary to read the identification information from the disk after restarting in order to determine whether or not the disk has been replaced, it is not possible to expect a reduction in the time required for start-up reproduction.

Since the conventional disk device is configured as described above, there is a problem that it takes a long time to start and play.

The present invention has been made to solve the above-described problems, and shortens the time required for start-up reproduction in a disk device in which the back-end unit is started later than the front-end unit is started. For the purpose.

The disk device according to the present invention includes a front end unit that pulls in, ejects, and reads data from the disk, and completes the start-up later than the start of the front-end unit, and the front end reads from the disk. And a back-end unit that performs playback processing of the stored data, and the front-end unit manages whether or not a disk has been replaced between the completion of the front-end unit startup and the completion of the back-end unit as disk replacement information. The back-end unit has a non-volatile memory for storing identification information for identifying a disk included in data read from the disk by the front-end unit. Is not stored in the non-volatile memory. When the playback process is performed using the identification information and the disk replacement information indicates that the disk has been replaced, the playback process is performed using the identification information included in the data newly read from the disk by the front end unit. Is what you do.

According to this invention, the front end unit manages whether or not a disk has been replaced between the completion of the start of the front end unit and the completion of the start of the back end unit as the disk replacement presence / absence information. The end unit has a non-volatile memory that stores identification information that identifies the disk included in the data read from the disk, and the disk replacement presence / absence information indicates that the disk was not replaced when the back-end unit started up. If the disc replacement information indicates that the disc has been replaced, the data read by the front-end unit from the disc is read out using the identification information stored in the non-volatile memory. If the disc is not replaced, playback processing is performed using the identification information included in the Is not necessary to newly read out the identification information from the disk, it is possible to shorten the time to start playback.

1 is a block diagram showing a configuration example of a disk device according to Embodiment 1 of the present invention. FIG. 6 is a diagram illustrating timings at which the front end unit and the back end unit of the disk device according to Embodiment 1 complete the startup. 3 is a flowchart showing an operation at the time of start-up reproduction of the disk device according to the first embodiment. It is a block diagram which shows the structural example of the disk apparatus based on Embodiment 3 of this invention. 14 is a flowchart showing an operation at the time of start-up reproduction of the disk device according to the third embodiment.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
As shown in FIG. 1, the disk device 1 according to the first embodiment includes a front end (hereinafter referred to as “FE”) unit 10 that pulls in, ejects, and reads data from a disk. And a back-end (hereinafter referred to as “BE”) unit 20 that performs reproduction processing of the read data. The image data reproduced by the BE unit 20 is output to the display device 2, and the audio data reproduced by the BE unit 20 is output to the audio output device 3.

The display device 2 is a display or the like that displays the image data received from the BE unit 20. The audio output device 3 is a speaker or the like that outputs audio data received from the BE unit 20.

The FE unit 10 includes an FE control unit 11, an FE data processing unit 12, and an FE CPU (Central Processing Unit) 13. The BE unit 20 includes a BE playback control unit 21, a content playback unit 22, a stream processing unit 22a, an AV decoder unit 22b, a BE CPU 23, an identification information storage unit 24, a resume information storage unit 25, and a discrimination information storage unit 26. ing. The FE control unit 11, the FE data processing unit 12, the BE reproduction control unit 21, and the content reproduction unit 22 are processing circuits such as an LSI (Large Scale Integration). The identification information storage unit 24, the resume information storage unit 25, and the discrimination information storage unit 26 are nonvolatile memories that can read and write information and can retain information even when the power is turned off. The identification information storage unit 24, the resume information storage unit 25, and the discrimination information storage unit 26 may be configured by one nonvolatile memory or a plurality of nonvolatile memories.

The FE data processing unit 12 and the content reproduction unit 22 are connected by an ATA (Advanced Technology Attachment) interface 30 so that data can be transmitted and received.
The FE CPU 13 and the BE CPU 23 are connected by an inter-CPU communication 31 so that data can be transmitted and received.

The FE control unit 11 receives the request content from the BE reproduction control unit 21 via the ATA interface 30 and controls the operation of the entire FE unit 10. In addition, control related to the operation of reading data from the disk, such as control of a loading mechanism that pulls in and out of the disk, control of a spindle motor that rotates the disk, and control of an optical pickup that reads data stored on the disk. Performed by the FE control unit 11.
Further, the FE control unit 11 acquires the value of the discharge flag managed by the FE CPU 13 in accordance with a request from the BE reproduction control unit 21 and outputs the value to the BE reproduction control unit 21 via the ATA interface 30. . Details of the discharge flag will be described later.

The FE data processing unit 12 executes an operation requested by the FE control unit 11. Specifically, the FE data processing unit 12 receives and decodes data read from the designated address of the disc by the optical pickup. The data decoded by the FE data processing unit 12 is output from the FE control unit 11 to the BE reproduction control unit 21 via the ATA interface 30.

FE CPU 13 executes scheduling of the FE unit 10 as a whole, memory management, and the like. Also, the FE CPU 13 manages whether or not a disk has been replaced between the time when the FE unit 10 completes activation when the disk device 1 is turned on and before the BE unit 20 completes activation. Have This disk exchange presence / absence information is stored in a non-illustrated nonvolatile memory or volatile memory included in the FE unit 10.

The FE CPU 13 determines whether or not the disk has been replaced based on the detection result of a switch installed in the front loading mechanism for detecting the presence or absence of the disk. The FE CPU 13 determines that the disk has been replaced when a disk ejection request is received from the outside, not whether or not the disk has actually been replaced. When the disk ejection request is not received, the FE CPU 13 replaces the disk. It may be determined that there was not. Further, the FE CPU 13 determines that the disk has been replaced when the FE unit 10 actually performs the disk discharging operation in accordance with the disk discharging request, and determines that the disk has not been replaced when the disk discharging operation is not performed. It may be a thing.

In the following, it is assumed that the CPU 13 for FE uses a discharge flag as disk replacement information. The FE CPU 13 sets the ejection flag to “1” when a disk ejection request is received from the outside after the FE unit 10 has been activated until the BE unit 20 has completed activation, and the disk ejection request If it is not accepted, the setting is kept at “0”.

Further, the FE CPU 13 outputs the value of the discharge flag to the BE CPU 23 via the inter-CPU communication 31. The output of the value of the discharge flag from the FE unit 10 side to the BE unit 20 side can be realized by at least one of the method using the inter-CPU communication 31 and the method using the ATA interface 30 described above. If it is.

The BE playback control unit 21 receives data read from the disc by the FE data processing unit 12 from the FE control unit 11 via the ATA interface 30. Then, the BE reproduction control unit 21 analyzes the received data, outputs audio data or image data included in the data to the content reproduction unit 22, and writes identification information into the identification information storage unit 24. The identification information is information unique to the disc, such as the number of files of data stored on the disc, file names, file attributes, and file systems, and is used for disc playback processing. For example, in the case of first play in which files are played in order from the beginning of the disc, the BE playback control unit 21 determines the order of the files based on the identification information.

The BE reproduction control unit 21 obtains the value of the discharge flag from the FE unit 10 via the ATA interface 30 or the inter-CPU communication 31 when the BE unit 20 is started up, and after the FE unit 10 has started up, the BE unit It is determined whether or not the disk has been replaced until 20 is completely activated. When the BE reproduction control unit 21 determines that the disk has been replaced, the BE reproduction control unit 21 requests the FE control unit 11 to read the identification information from the new disk after replacement, and performs a reproduction process using the identification information read from the disk. On the other hand, if it is determined that the disc has not been replaced while being inserted, the BE playback control unit 21 reads the identification information from the identification information storage unit 24 and performs a playback process.

The BE playback control unit 21 generates resume information including the interrupted address and writes the resume information to the resume information storage unit 25 when playback of the disc is interrupted. The BE playback control unit 21 uses the resume information stored in the resume information storage unit 25 to perform playback from the playback interruption position when performing resume playback of the disc.

Further, the BE reproduction control unit 21 processes the disc identification information, generates discriminating information such as an ID unique to the disc, and writes the discriminating information into the discriminating information storage unit 26. The BE reproduction control unit 21 determines whether or not the disk before replacement and the disk after replacement are the same when there is a possibility that the disk replacement operation has been performed in the FE unit 10. The discrimination information stored in the disc 26 is compared with the discrimination information generated from the identification information read from the disc.

The content playback unit 22 is roughly divided into a stream processing unit 22a and an AV decoder unit 22b. The stream processing unit 22a separates the data received from the BE reproduction control unit 21 into audio data and image data, and outputs them to the AV decoder unit 22b. The AV decoder unit 22b decodes the audio data and the image data received from the stream processing unit 22a, and outputs them to the display device 2 and the audio output device 3 while synchronizing the audio and the image.

When receiving a request from the outside, the BE CPU 23 outputs an instruction in accordance with the request to the BE playback control unit 21 and the content playback unit 22, or performs FE control via the BE playback control unit 21 and the ATA interface 30. Or output to the FE CPU 13 via the inter-CPU communication 31. Further, the BE CPU 23 executes scheduling and memory management for the entire BE unit 20.

Next, a description will be given of an operation example in the case where there is a disk reproduction request from the outside after the disk device 1 is powered on and the activation of the FE unit 10 and the BE unit 20 is completed.
When the BE CPU 23 receives a disk playback request from the outside, the BE CPU 23 instructs the BE playback control unit 21 to receive the request. When receiving a disk playback request instruction from the BE CPU 23, the BE playback control unit 21 outputs a data read request for acquiring data from the specified address of the disk to the FE control unit 11 via the ATA interface 30.

When the FE control unit 11 receives a data read request from the BE reproduction control unit 21 via the ATA interface 30, the FE control unit 11 controls the FE data processing unit 12 to execute data read from the designated address. The FE data processing unit 12 decodes data read from the designated address of the disk by the optical pickup and outputs the decoded data to the FE control unit 11. The FE control unit 11 outputs the data received from the FE data processing unit 12 to the BE reproduction control unit 21 via the ATA interface 30.

The BE playback control unit 21 outputs audio data and image data among the data received from the FE data processing unit 12 via the ATA interface 30 to the content playback unit 22. The content reproduction unit 22 decodes the audio data and the image data received from the BE reproduction control unit 21 and outputs them to the display device 2 and the audio output device 3. Further, the BE reproduction control unit 21 writes the disc identification information in the identification information storage unit 24 among the data received from the FE data processing unit 12 via the ATA interface 30. Further, the BE reproduction control unit 21 generates discrimination information from the identification information and writes it into the discrimination information storage unit 26.

When playback is interrupted during playback of the disc, the BE playback control unit 21 generates resume information including an address indicating the playback interrupt position, and writes it into the resume information storage unit 25.

In this way, the operation request input from the outside to the disk device 1 is a procedure in which the BE CPU 23 receives and expands it to each part of the disk device 1.
As an exception to the operation procedure, only the disk ejection request instructing the execution of AnyTimeEJECT is directly input not only to the BE CPU 23 but also to the FE CPU 13. For example, when the user presses a discharge button provided on the housing of the disk device 1, a disk discharge request is input to the FE CPU 13 and the BE CPU 23.
The exception is that when the power of the disk device 1 is turned on, the BE unit 20 is supplied with power compared to the time (for example, around 1 second) that is required after the power is supplied to the FE unit 10 to complete the startup. This is because it takes a long time (for example, around ten and a few seconds) to complete the startup.

For example, when there is a disk ejection request from the outside while the power is off, if both the FE unit 10 and the BE unit 20 complete the startup and execute the disk ejection request, it takes time until the disk is ejected. The operability of is very bad.
Therefore, when there is a disk ejection request from the outside while the power is off or before the BE unit 20 completes the activation, the FE unit 10 that has completed the activation executes the disk ejection request without waiting for the BE unit 20 to complete the activation. Thus, a mechanism for improving the operability for the user by completing the disc ejection in a short time is introduced.

FIG. 2 is a diagram illustrating timing at which the FE unit 10 and the BE unit 20 complete activation, and the horizontal axis represents time.
The problem at the time of AnyTimeEJECT mentioned above is demonstrated using FIG. When the power switch of the disk device 1 is turned on, power is simultaneously supplied to the FE unit 10 and the BE unit 20. For example, the power switch may be provided on the housing of the disk device 1, or may be an accessory power switch of a vehicle when the disk device 1 is an in-vehicle device.

Since the FE unit 10 is not equipped with an OS or an OS having a smaller scale than the BE unit OS, the FE unit 10 is started up 1 to 2 seconds after the power is turned on as indicated by the solid line. Complete. The FE unit 10 can recognize and execute a request from the outside during a period indicated by a broken line after completion of activation. On the other hand, as shown by the solid line, the BE unit 20 first completes the startup of the OS by the BE CPU 23 within about 10 seconds from the power-on, and the startup of the LSI or the like is completed several seconds later. Startup is complete. The BE unit 20 can recognize and execute a request from the outside during a period indicated by a broken line after completion of activation.

When a new disk is inserted immediately after the FE unit 10 executes the disk ejecting operation, the FE unit 10 pulls this disk into the interior and sets it on the turntable, thereby completing the disk insertion state. If the time required for the disk replacement is 9 seconds, the BE unit 20 cannot recognize the disk ejection request because the OS is still running. Further, when the BE unit 20 completes the activation, the disk is already inserted when viewed from the BE unit 20, and therefore it cannot be recognized that the disk has been replaced.

In this way, since the FE unit 10 and the BE unit 20 have different activation completion timings, conventionally, after the BE unit 20 completes the activation, the FE unit 10 always reads the identification information from the disk, and the BE unit 20 Reproduction processing was executed using the identification information. In a disc in which a large number of files are stored, the identification information may be several Mbytes to several tens of MBytes, and it takes tens of seconds to read. In this case, since the reading time of the identification information is added to the time required for completing the activation of the FE unit 10 and the BE unit 20 every time, it takes time to start the activation reproduction, and the user's operability becomes very poor. .
Therefore, in the first embodiment, a configuration for shortening the time taken to start the start-up reproduction of the disk device 1 is adopted.

FIG. 3 is a flowchart showing an operation example at the time of start-up reproduction of the disk device 1 according to the first embodiment. When a start / replay request is input from the outside when the disk device 1 is in a power-off state, first, in step ST1, the power of the disk device 1 is turned on and power is supplied to the FE unit 10 and the BE unit 20. The start reproduction request is, for example, an ON operation for the accessory power switch of the vehicle or the power switch of the disk device 1.

When about 1 second has elapsed since the power-on in step ST1, the FE unit 10 first completes startup and is ready to accept a disk ejection request from the outside (step ST2). In this state, the FE CPU 13 sets the discharge flag to “1” when receiving a disk discharge request from the outside, and keeps the discharge flag set to “0” when no disk discharge request is received (step ST3).

When about several tens of seconds have elapsed since the power-on in step ST1, the BE unit 20 completes startup (step ST4). When the start of the BE playback control unit 21 is completed, the BE playback control unit 21 uses at least one of the ATA interface 30 or the inter-CPU communication 31 to acquire the value of the discharge flag of the FE CPU 13 and ejects the disk before the start of the BE unit 20 is completed. It is confirmed whether or not there is a request, that is, whether or not there is a possibility that the disk has been exchanged (step ST5).

When using the ATA interface 30 to acquire the value of the discharge flag, a vendor unique command is added to the ATA command so that the value of the discharge flag can be acquired. The BE regeneration control unit 21 transmits a command for obtaining the value of the discharge flag to the FE control unit 11 via the ATA interface 30 after the start-up of the BE unit 20 is completed. The FE control unit 11 acquires the value of the discharge flag from the FE CPU 13 according to the received command, and outputs it to the BE reproduction control unit 21 via the ATA interface 30.

When using the inter-CPU communication 31 for obtaining the value of the discharge flag, an information bit indicating the value of the discharge flag is added to the inter-CPU communication protocol. The BE CPU 23 acquires the value of the information bit from the FE CPU 13 through the inter-CPU communication 31 after the start of the BE unit 20 and outputs it to the BE reproduction control unit 21 as the value of the discharge flag.

The BE CPU 23 obtains the value of the ejection flag using both or either of the ATA interface 30 and the inter-CPU communication 31, so that a disk ejection request is issued from the outside before the BE unit 20 completes startup. Make sure you know if it happened.
The ATA interface 30 and the inter-CPU communication 31 are not specially provided for acquiring the value of the discharge flag, but originally provided for data transmission / reception between the FE unit 10 and the BE unit 20. It is. Therefore, it is not necessary to add new parts or the like in order to acquire the value of the discharge flag.

If the value of the ejection flag acquired from the FE unit 10 is “0” (step ST5 “NO”), the BE reproduction control unit 21 has not issued a disc ejection request, that is, the disc is still inserted. It is determined that there is, and the process proceeds to step ST6.

On the other hand, if the value of the ejection flag is “1” (“YES” in step ST5), the BE reproduction control unit 21 determines that there is a disk ejection request, that is, there is a possibility that the disk has been replaced. The process proceeds to step ST9.

In step ST6, the BE reproduction control unit 21 confirms whether or not disc identification information is stored in the identification information storage unit 24. When identification information is stored in the identification information storage unit 24 (step ST6 “YES”), this identification information is the same as the identification information of the currently inserted disc. Therefore, the BE reproduction control unit 21 does not instruct the FE control unit 11 to read data from the disc, and reads identification information from the identification information storage unit 24 (step ST7). The BE reproduction control unit 21 reads the resume information from the resume information storage unit 25, instructs the FE control unit 11 to read data at the address indicated by the resume information, and performs resume reproduction (step ST8).

On the other hand, when any trouble such as failure or disappearance of writing of the identification information occurs, the identification information storage unit 24 does not store the identification information (step ST6 “NO”), and the BE reproduction control unit 21 proceeds to step ST9. move on.

In step ST9, the BE playback control unit 21 instructs the FE control unit 11 to read data from the disc, and acquires disc identification information (step ST9). Subsequently, the BE reproduction control unit 21 generates discrimination information using the identification information read from the disc, and compares it with the discrimination information stored in the discrimination information storage unit 26 (step ST10). If the discriminating information does not match (step ST10 “NO”), the BE playback control unit 21 determines that the disc has been replaced while the BE unit 20 is running, and the FE control unit 21 plays back the files in order from the beginning of the disc. 11 is performed and a first play is performed (step ST11).

On the other hand, if the discrimination information matches (step ST10 “YES”), the BE playback control unit 21 determines that the disk has not been replaced while the BE unit 20 is running, and the resume stored in the resume information storage unit 25. The information is read, and data reading at the address indicated by the resume information is instructed to the FE control unit 11 to perform resume reproduction (step ST8).

In step ST9, the time required for the FE unit 10 to read the identification information from the disk becomes longer as the number of files on the disk increases, and reaches tens of seconds for 2000 files. On the other hand, the time required for the BE reproduction control unit 21 to read the identification information from the identification information storage unit 24 in step ST7 is about 1 to 2 seconds, and the time required from the power-on to the start of reproduction can be greatly reduced. it can.

As a disc to be played back by the disc device 1, there is an optical disc such as a CD (Compact Disc), a DVD (Digital Versatile Disc), or a BD (Blu-ray Disc; registered trademark, hereinafter, the registered trademark is omitted). . Optical discs are broadly classified into read-only, write-once, and rewritable types. Write-once or rewritable discs have more files than read-only discs such as DVD-Video and BDMV, and the reading time of identification information is long. Considered long.

A disc in which a large number of files are stored, such as a write-once or rewritable disc, has a large capacity of identification information of several megabytes to several tens of megabytes. Therefore, as the nonvolatile memory used for the identification information storage unit 24, a large-capacity NAND nonvolatile memory is desirable in consideration of cost. However, NAND-type non-volatile memory has the merit of low cost and large capacity, but has the demerit that the upper limit of the number of writing is specified in order to ensure the reliability of stored data, and SLC (Single Level Cell) method But it can only be written thousands of times.

Therefore, the BE reproduction control unit 21 does not write the identification information in the identification information storage unit 24 when the disc inserted into the disc device 1 is a reproduction-only type, and selectively selects the identification information only when the disc is a write-once type or a rewritable type. May be written in the identification information storage unit 24. As a result, the number of writes to the identification information storage unit 24 can be suppressed, so that a nonvolatile memory with a limited number of writes can be used as the identification information storage unit 24.

The identification information of a read-only disc generally has a capacity of 1/10 or less compared to the identification information of a write-once or rewritable disc. Therefore, the time for reading the identification information from the read-only disc is shorter than the time for reading the identification information from the write-once or rewritable disc. Therefore, even if the read-only disc is always configured to read the identification information from the disc, the time required for start-up reproduction can be shortened.

However, even if it is a read-only disc with a small identification information capacity, if the recording surface is scratched or vibrated, the reading accuracy will deteriorate and it may take time to read the identification information. There is sex. For this reason, if the non-volatile memory used as the identification information storage unit 24 does not have the above-described limitation on the number of times of writing, it is possible to write not only the identification information of the write-once or rewritable disc but also the identification information of the read-only disc. Good. For example, since the in-vehicle disk device 1 receives vehicle vibration, it is desirable to write the identification information in the identification information storage unit 24 regardless of the type of the disk.

Thus, by selecting the type of disk to be written to the identification information storage unit 24 according to the performance of the memory used for the identification information storage unit 24 and the environmental conditions for using the disk device 1, the memory performance and It is possible to prevent a delay in the start and playback time due to environmental conditions and the like.

As described above, according to the first embodiment, the FE unit 10 manages whether or not a disk has been replaced between the completion of the startup of the FE unit 10 and the completion of the startup of the BE unit 20 as disk replacement presence / absence information. The unit 20 has an identification information storage unit 24 as a non-volatile memory for storing identification information included in data read from the disk by the FE unit 10. When the BE unit 20 has been activated, the disk replacement presence / absence information is stored in the disk. When it is shown that the disk has not been exchanged, reproduction processing is performed using the identification information stored in the identification information storage unit 24. When the disk exchange presence / absence information indicates that the disk has been exchanged, FE is performed. Since the reproduction processing is performed using the identification information included in the data newly read from the disk by the unit 10, if the disk is not replaced, There is no need to newly read the identification information. Therefore, it is possible to reduce the time required for start-up reproduction.

Further, according to the first embodiment, the BE unit 20 uses the ATA interface 30 or the inter-CPU communication 31 to acquire the disk replacement presence / absence information from the FE unit 10. There is no need to add.

Embodiment 2. FIG.
Since the configuration of the disk device according to the second embodiment is the same as the configuration shown in FIG. 1 of the first embodiment in the drawing, FIG. 1 is used below.

As described in the first embodiment, when a low-cost and large-capacity NAND nonvolatile memory is used as the identification information storage unit 24, the upper limit of the number of times of writing is defined. Even if the disc is limited to the type or the rewritable disc, the maximum number of times is reached as soon as the disc identification information is written into the discernment information storage unit 24 every time a new disc is inserted, and the reliability of the stored data is remarkably increased. It will fall.

Therefore, in the second embodiment, the timing for writing the identification information to the NAND type nonvolatile memory is limited when the disk device 1 receives a power-off operation request (hereinafter referred to as “power-off”). .
Specifically, the BE playback control unit 21 does not write the disc identification information from the FE unit 10 but writes it to the identification information storage unit 24 and develops it on a main memory (not shown) to perform playback processing. The BE reproduction control unit 21 writes the identification information in the identification information storage unit 24 only when the identification information is expanded on the main memory when the power is turned off. Thereby, even if the disk is replaced during the normal operation after the FE unit 10 and the BE unit 20 complete the startup, the process of writing the identification information of the replaced new disk into the identification information storage unit 24 is not performed. For this reason, the number of times of writing can be suppressed. Therefore, data reliability can be maintained even when a NAND nonvolatile memory is used for the identification information storage unit 24.

In the second embodiment, as in the first embodiment, the BE reproduction control unit 21 does not write the identification information in the identification information storage unit 24 when the disc inserted in the disc device 1 is a reproduction-only type. The identification information may be selectively written into the identification information storage unit 24 only in the case of the write-once type or the rewritable type. Thereby, the number of times of writing to the NAND type nonvolatile memory can be suppressed.
Furthermore, the timing for writing the identification information of the write-once or rewritable disc to the NAND type nonvolatile memory may be limited when the disc device 1 is powered off. Thereby, the number of times of writing to the NAND type nonvolatile memory can be further suppressed.

Embodiment 3 FIG.
FIG. 4 is a block diagram illustrating a configuration example of the disk device 1 according to the third embodiment. In FIG. 4, the same or corresponding parts as those in FIG. 1 shown in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the disk device 1 according to the third embodiment, the identification information storage unit 24 includes a first nonvolatile memory 24a and a second nonvolatile memory 24b. Different types of nonvolatile memories are used for the first nonvolatile memory 24a and the second nonvolatile memory 24b.

For example, a NAND nonvolatile memory is used as the first nonvolatile memory 24a. The BE reproduction control unit 21 writes the identification information in the first nonvolatile memory 24a when the disk inserted in the disk device 1 is a write-once type or a rewritable type having a large identification information capacity.

On the other hand, an FRAM (Ferroelectric Random Access Memory; a registered trademark, hereinafter, the registered trademark is omitted from description) having a smaller capacity than the NAND-type nonvolatile memory is used as the second nonvolatile memory 24b. The FRAM has a smaller capacity than the NAND type nonvolatile memory, but the number of times of writing is almost unlimited. Therefore, the BE reproduction control unit 21 writes the identification information in the second nonvolatile memory 24b when the disk inserted into the disk device 1 is a reproduction-only type having a small identification information capacity.

FIG. 5 is a flowchart showing an operation example at the time of start-up reproduction of the disk device 1 according to the third embodiment. In FIG. 5, the processing of steps ST1 to ST5 is the same as the processing shown in FIG.

When the value of the ejection flag is “0”, that is, when there is no disk ejection request and the disk is still inserted (step ST5 “NO”), the BE reproduction control unit 21 records the disk inserted in the disk device 1. Is a reproduction-only type, a write-once type, or a rewritable type (step ST21).
In order to determine whether or not the disc is a read-only type, for example, the BE playback control unit 21 stores the type of the disc inserted into the disc device 1 when the power is turned off in a non-illustrated non-volatile memory or the like. In step ST21 when the power is turned on, the type of the disk stored in the nonvolatile memory or the like may be referred to.

When the disc inserted in the disc device 1 is a reproduction-only type (step ST21 “YES”), the BE reproduction control unit 21 stores the identification information of the reproduction-only disc in the second nonvolatile memory 24b. It is confirmed whether or not (step ST22). When the identification information is stored in the second nonvolatile memory 24b (step ST22 “YES”), the BE reproduction control unit 21 does not instruct the FE control unit 11 to read data from the disc, and the second nonvolatile memory 24b The identification information is read from the memory 24b (step ST23), and the process proceeds to step ST8. On the other hand, when the identification information is not stored in the second nonvolatile memory 24b (step ST22 “NO”), the BE reproduction control unit 21 proceeds to step ST9.

When the disc inserted in the disc device 1 is a write-once type or a rewritable type (step ST21 “NO”), the BE reproduction control unit 21 stores the identification information of the write-once type or rewritable disc in the first nonvolatile memory 24a. It is confirmed whether or not it is stored (step ST24). When identification information is stored in the first nonvolatile memory 24a (step ST24 “YES”), the BE reproduction control unit 21 does not instruct the FE control unit 11 to read data from the disk, and the first nonvolatile memory 24a The identification information is read from the memory 24a (step ST25), and the process proceeds to step ST8. On the other hand, when the identification information is not stored in the first nonvolatile memory 24a (step ST24 “NO”), the BE reproduction control unit 21 proceeds to step ST9.

As described above, according to the third embodiment, the BE unit 20 has the first nonvolatile memory 24a and the second nonvolatile memory 24b as the identification information storage unit 24, and stores the identification information of the write-once type or rewritable type disc. Since the identification information of the read-only disk is written to the second nonvolatile memory 24b, the nonvolatile memory suitable for the memory performance required according to the type of the disk is stored in the identification information storage unit. 24 can be used. Therefore, it is possible to reduce the time required for start-up reproduction for all types of disks while suppressing the number of times of writing to the NAND type nonvolatile memory.

In the third embodiment, as in the second embodiment, the timing for writing the identification information of the write-once or rewritable disk to the NAND-type first nonvolatile memory 24a is limited when the power of the disk device 1 is turned off. May be. Thereby, the number of times of writing to the NAND type nonvolatile memory can be further suppressed.

In the present invention, within the scope of the invention, free combinations of the respective embodiments, modification of arbitrary components of the respective embodiments, or omission of arbitrary components of the respective embodiments are possible. Further, although the front loading mechanism is employed as the disk loading mechanism in the disk device, a top loading mechanism or the like may be used.

The disk device according to the present invention is suitable for use in an in-vehicle disk device having a function such as AnyTimeEJECT because the time required for start-up reproduction is shortened.

1 disk device, 2 display device, 3 audio output device, 10 FE unit, 11 FE control unit, 12 FE data processing unit, 13 FE CPU, 20 BE unit, 21 BE playback control unit, 22 content playback unit, 22a stream Processing unit, 22b AV decoder unit, 23 BE CPU, 24 identification information storage unit, 24a first nonvolatile memory, 24b second nonvolatile memory, 25 resume information storage unit, 26 discrimination information storage unit, 30 ATA interface, 31 Inter-CPU communication.

Claims

A front-end unit that pulls in, ejects, and reads data from the disk;
A back end unit that completes startup later than the start of the front end unit, and performs a reproduction process of data read from the disk by the front end unit,
The front end unit manages whether or not a disk has been exchanged between completion of activation of the front end unit and completion of activation of the back end unit as disk exchange presence / absence information,
The back-end unit has a nonvolatile memory for storing identification information for identifying the disk included in data read from the disk by the front-end unit, and whether or not the disk is replaced when the activation of the back-end unit is completed If the information indicates that the disk has not been replaced, reproduction processing is performed using the identification information stored in the nonvolatile memory, and the disk replacement presence / absence information indicates that the disk has been replaced. In the case where there is a disc device, the front end unit performs a reproduction process using identification information included in data newly read from the disc.
2. The front-end unit, when receiving a disk ejection request from outside during a period from completion of startup of the front-end unit to completion of startup of the back-end unit, considers that the disk has been replaced. The disk device described.
The disk apparatus according to claim 1, wherein the back-end unit acquires the disk replacement information from the front-end unit using an ATA interface.
2. The disk device according to claim 1, wherein the back-end unit acquires the disk exchange presence / absence information from the front-end unit using inter-CPU communication.
2. The disk device according to claim 1, wherein the nonvolatile memory is a NAND type, and the back-end unit writes the identification information into the NAND type nonvolatile memory when the power is turned off.
The non-volatile memory is a NAND type, and the back-end unit writes identification information of a write-once or rewritable disc into the NAND type non-volatile memory and does not write identification information of a read-only disc. 1. The disk device according to 1.
The back-end unit includes a first nonvolatile memory and a second nonvolatile memory as the nonvolatile memory, and writes identification information of a write-once or rewritable disk to the first nonvolatile memory, thereby identifying a read-only disk. 2. The disk device according to claim 1, wherein information is written into the second nonvolatile memory.
8. The disk device according to claim 7, wherein the first nonvolatile memory is a NAND type, and the second nonvolatile memory is an FRAM.