JP2942108B2 - Recording and playback device that can interface with a personal computer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording data on a recording medium and / or reproducing data from the recording medium, and more particularly to an externally connected personal computer (FD) having an FD (floppy disk) drive device. Personal computer).

[0002]

2. Description of the Related Art In general, a personal computer having an FD drive device and a CD player having a CD-ROM drive device are devices having remarkable characteristics in various points as described below. Can be.

First, focusing on the media, FD
Has a small storage capacity of at most 4MB (megabyte), uses both sides of the disk,
A CD-ROM disk has a large storage capacity of about 600 MB, while only one side of the disk is used, and can only reproduce data, while a medium capable of both recording and reproducing data. There is a big difference in being a media.

[0004] Focusing on the drive device for handling these media, the FD drive device and the CD-ROM drive device differ in various points based on the difference in the characteristics of the media as shown in Table 1 below. The characteristics are very different.

[0005]

[Table 1]

In summary, the FD drive is a subordinate drive directly controlled by a control circuit on a personal computer board.
The D-ROM drive device receives commands and parameters from the host personal computer, and is an intelligent drive device in which execution management of the CD-ROM disk is performed by the drive itself, and has the same characteristics as an HD (hard disk) drive device. Is what it is.

As described above, the FD drive device and the CD-R
Due to the large characteristic difference between the OM drive device and the OM drive device, there has been an attempt to interface between a personal computer having an FD drive device and a CD player having a CD-ROM drive device to date. I haven't.

[0008]

By the way, in order to connect an FD drive of a personal computer to a CD-ROM drive of a CD player via a personal computer interface and to read data, various types of data as described below are used. Overcoming the challenge and trying to achieve it.

First, commands and parameters are received from the personal computer using the FD interface signal of the personal computer, and are transferred to the CD player. At the same time, status data and vendor data from the CD player are transmitted. It is necessary to deliver to the personal computer side, and the means for these delivery are realized.

Secondly, the difference between the data processing speed on the CD player side and the data processing speed on the personal computer side is absorbed, and the timing of data reading on the CD player side and the timing of data transfer to the FD device of the personal computer are adjusted. It is necessary to absorb the differences,
Realization of a data buffering mechanism that executes these.

Third, since the FD drive device can only process data conforming to the physical format of the FD, ie, the FD format, the data transferred from the CD player to the personal computer is converted to the FD format. Formatter to convert and F received from PC
A deformatter for converting data in the D format into a format that can be used in a CD-ROM drive device is required. For example, a conversion device that achieves these functions is realized.

An object of the present invention is to overcome the above-mentioned problems and achieve the object, and an object of the present invention is to provide an interface between a personal computer having an FD drive device and a recording / reproducing device having a recording medium drive device. An object of the present invention is to provide a recording / reproducing apparatus that can perform the recording / reproducing.

[0013]

According to the present invention, there is provided a recording and reproducing apparatus which can interface with a personal computer of the present invention.
The raw device is a CD-ROM drive under the control of the central controller.
Recording and / or CD-ROM disk of data to disk
A CD player for reproducing recorded data of the disc,
Has D player and floppy disk interface
Connected to an externally connected PC,
PC interface consisting of a communication unit and a buffer control unit
A receiving section, wherein the receiving section is located in front of the personal computer.
Supplied through the floppy disk interface
The serial data in the floppy disk format
CD format suitable for CD-ROM discs
After reformatting to real data, the CD
The transmission unit supplies the CD
The data supplied from the player is sent to the buffer controller.
Received on a floppy disk for this data
After adding sector information and cylinder information, etc.
Floppy disk format suitable for
The floppy disk drive as serial data.
What is supplied to the personal computer through the interface
And the buffer control unit controls the CD-ROM disc.
This is to temporarily store the data read from the disk.
That it is equipped with a means.

[0014]

According to the above means, the receiving unit receives data including a command or the like from the FD drive device of the externally connected personal computer, deformats the data in the FD format into data in the normal format, From the data, the command or the like is accessed by a central control unit (CPU) arranged inside the recording / reproducing apparatus. For this reason, even if the data format processed on the FD drive device side of the personal computer and the data format processed on the recording / reproducing device side are significantly different,
By de-formatting the command and the like from the FD drive device and passing it to the central control device of the recording and reproducing device, it is possible to cause the recording and reproducing device to execute a data processing operation in accordance with the content of the command and the like. become.

The buffer control unit writes the data read from the recording / reproducing device to a data buffer provided in association with the buffer control unit, and transfers the data read from the data buffer to a transmission unit. Like that. For this reason, the transfer rate of the data read from the recording / reproducing apparatus and the transfer rate of the data to be transferred to the personal computer through the transmission section are significantly different, and a data buffer having a minimum storage capacity is used. Even if it does, the data can be effectively transferred without lowering the transfer speed of the data transmitted to the personal computer through the transmission unit.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus capable of interfacing with a personal computer according to the present invention, which is applied to a CD player for reproducing a CD-ROM as the recording / reproducing apparatus. is there.

In FIG. 1, 1 is a CD-ROM mechanism, 2 is a central control unit (CPU) disposed inside a CD player, 3 is a CD signal processing LSI (high density integrated circuit), 4 is a CD servo LSI, 5 is a host interface (I / F) unit, 6 is a receiving unit, 7 is a command / status buffer unit, 8 is a buffer control unit, 8a is a data buffer unit, 9 is a transmitting unit, and 10 is an FD interface (I / F). And I is a CD player side area,
II indicates the personal computer interface area, and III indicates the personal computer side area.

In the CD player side area I, the CD-ROM mechanism 1 includes an optical pickup for optically detecting data recorded on the CD, and the optical pickup for controlling the radius of the CD by controlling the CD servo LSI 4. And a slide mechanism for appropriately moving in the direction. The CD signal processing LSI 3 includes a conversion amplification unit that converts analog data read from a CD through the optical pickup into digital data, a frequency demodulation unit that demodulates the digital data by EFM (Extended Frequency Modulation), And a rotation control unit for controlling the number of rotations of the CD. Each of these components performs the above-described data processing according to an instruction from the central control unit 2. The CD servo LSI 4 includes a focusing unit that focuses a light spot on a CD, a tracking control unit that performs tracking control of the CD, and a control system that performs slide control. The above-described processing is performed by this instruction.

Also, the personal computer interface side area II
, The host interface unit 5 detects the FD drive device operating on the personal computer side, detects that serial data transfer has been started from the personal computer side, and uses the CD-ROM mechanism 1 to It notifies the personal computer that has been replaced. The receiving unit 6 deformats the serial data in the FD format transferred from the personal computer into data in a normal format, and transfers commands and parameters in the deformatted data to the command / status buffer unit 7. command/
The status buffer unit 7 temporarily stores the commands and parameters sent from the receiving unit 6 and reads out the commands or parameters and transfers them to the central control unit 2 when the central control unit 2 requests them. Let
At the same time, drive status and media information to be transferred to the personal computer are temporarily stored. The buffer control unit 8
The data transferred from the CD signal processing LSI 3 is stored in the data buffer unit 8a, and when the data can be transferred to the personal computer, the stored data is read from the data buffer unit 8a and transferred to the transmission unit 9. I do. The transmission unit 9 formats the data transferred from the data buffer unit 9 and the status in the command / status buffer unit 7 so as to conform to the FD format.
Transfer to the FD drive device on the personal computer side.

Further, in the personal computer side area III, F
The D interface 10 is a type of connector used when connecting an FD drive device to a personal computer, and has, for example, 34 pins. Type signal (HIGH DENS
ITY) pin 4 has a signal (I
N USE) and the 6th pin has a drive 3 selection signal (DRIVE SEL
ECT 3), Pin 8 is a pulse signal that is output every FD rotation
(INDEX) The drive signal for the drive 0 (DRIVE
SELECT 0), the 12th pin has a drive 1 selection signal (DRI
VE SELECT 1), Pin 14 is the drive 2 selection signal (D
RIVE SELECT 2), the motor start command signal (M
OTOR ON), and pin 18 has a head movement direction designation signal (D
IRECTION), a signal (STEP) for instructing the movement of the head on the 20th pin, and write data (WRI
TE DATA), a signal (WRITE GATE) for instructing data writing on the 24th pin, and the head
Signal (TRACK 0) indicating that you are above
A signal indicating that data writing to D is prohibited (WRITE PROTEC
T), the 30th pin has a playback data signal (READ DA
TA) and a signal (SI
A signal (DISK CHANGE) indicating that the FD has been exchanged is assigned to the 34th pin, and the ground potential is assigned to the remaining odd-numbered pins.

Hereinafter, the overall operation of the recording / reproducing apparatus having the above-described configuration will be described. Here, data recorded on a CD-ROM disc is read by a CD player in accordance with a command from a personal computer. The case where the read data is transferred to the personal computer will be described as an example.

First, serial data including data to be written to the FD in the FD format and commands and parameters in the FD format are supplied from the personal computer side area I through the FD interface 10 to the personal computer interface side area II. The command is
This means that data recorded on a CD-ROM disc is read, and the parameter is a CD-ROM disc.
It indicates from which address in the disk and how much recording data to read. Next, when the receiving unit 6 receives the serial data, the serial data in the FD format is reformatted into data in a normal format, and the personal computer sends out the command and parameter data sent out. The data is transferred to the status buffer unit 7 and accumulated. At this time, the host interface unit 5 notifies the central control device 2 that the command has been issued from the personal computer, and the central control device 2 having received the notification has already been stored in the command / status buffer unit 7. The command in the data is read, and the type of the command is interpreted as a read (read) command.
Subsequently, the central controller 2 reads out the parameters in the data, makes the optical pickup access an address to be read out in the CD-ROM disk, and reads out the data from the CD-ROM disk after the access. The read data is transferred to the buffer control unit 8 via the CD signal processing LSI 3.

At this time, the buffer control unit 8 makes the data buffer unit 8a transmit the transferred data,
Store it there temporarily. When a certain amount of data is accumulated in the data buffer unit 8a, the buffer control unit 8
Reads the data stored in the data buffer unit 8a and causes the transmission unit 9 to transmit the data. When receiving the data from the buffer control unit 8, the transmission unit 9 adds FD to the data.
After adding information such as sectors and cylinders used in the FD interface, the data is formatted so as to conform to the FD format, and serial data is output to the FD interface 10.
Through to the PC. On the personal computer side, the CD-ROM in the transferred serial data
Is read out and stored in the FD.

In this case, a series of operations after reading of data from the CD-ROM disk are continuously executed as long as data to be read by the central control unit 2 remains in the CD-ROM disk. Then, when the central control device 2 finishes reading all the data to be read, the series of operations is completed.

In the above description, the central controller 2 detects a read command. However, when the central controller 2 detects another command, for example, a command indicating the initial state of the drive is issued. When detecting and reading the fact to the personal computer side, almost the same operation as the above-described operation is performed. However, when reading the initial state of the drive, status data is transferred instead of the data read from the CD-ROM disk being transferred to the personal computer. At this time, when the personal computer receives the status data, the personal computer can determine that the drive is operating normally or abnormally by taking out the status from the status data.

In general, a CD-ROM drive device has a high data read speed (for example, 15 drive devices).
0 KB / S), and the FD interface 10 is an interface having a low data transfer rate (for example, 64
KB / S). Therefore, as in the present embodiment, a CD-RO having a high data read speed is used.
In the case where an FD interface having a low data transfer speed is connected to the M drive device, a buffering means for reducing the difference in the data transfer speed is required.

Normally, a primary storage device such as a RAM is used for such buffering means. In the embodiment shown in FIG. 1, however, the following configuration is employed. .

FIG. 2 is a block diagram showing an example of the structure of the buffering means employed in the embodiment shown in FIG.

In FIG. 2, 1a is a CD-ROM drive, 11 is a RAM buffer, 12 is a first address generation counter, 13 is a second address generation counter,
14 is a write timing generation circuit, 15 is a read timing generation circuit, 16 is a spare buffer unit, and 17 is RA
The M-full detector is the same as the one shown in FIG.

The RAM buffer unit 11 stores the CD-
The data read from the CD-ROM disc in the ROM drive device 1a is received through the spare buffer unit 16 and temporarily stored. The first address generation counter 12 counts up in accordance with the data reading speed in the CD-ROM drive 1a,
The second address generation counter 12 counts up according to the data transfer speed of the FD interface 10. The write timing generation circuit 14 uses the CD-
When writing the data read from the ROM disk to the RAM buffer unit 11, a timing signal for setting the write timing is generated, and the read timing generation circuit 15 transfers the data from the RAM buffer unit 11 to the FD interface 10. At this time, a timing signal for setting the timing of reading data in the RAM buffer unit 11 is generated. Spare buffer section 16
Performs primary storage of data to be written into the RAM buffer unit 11 in order to give priority to data read timing when data write timing and data read timing collide in the RAM buffer unit 11. The RAM full detecting unit 17 detects that the RAM buffer unit 11 is full with accumulated data, and generates a full detection signal.

FIG. 3 is an explanatory diagram showing the timing relationship between data read from a CD-ROM disc in the CD-ROM drive 1a and data writing and data reading in the RAM buffer unit 11.

3A shows data read from a CD-ROM disk, FIG. 3B shows the case where the storage capacity of the RAM buffer unit 11 is 4 Kbytes (2 Kbytes × 2), and FIG. 3C shows the same storage capacity. Is 8K bytes (2K bytes x
It shows data writing and data reading in the case of 4).

Here, the overall operation of the buffering means having the above configuration will be described with reference to FIG.

In this example, however, it is assumed that no data is stored in the RAM buffer unit 11 and the RAM buffer unit 11 is empty. The RAM buffer unit 11 is divided into storage units each having a storage capacity of a certain unit (in this example, 2 Kbytes). Writing and reading of data to and from the RAM buffer unit 11 are performed based on the storage capacity of the unit. It is done. In the case of CD-ROM,
The storage capacity of the unit is often expressed as one block unit, and the data size of one block is usually 2 units.
It is in units of 352 bytes. Also, of the 2352 bytes of data, the valid data on the FD interface 10 side is 2048 bytes. In this case, the FD interface 10 has 512 bytes in one sector and can transfer data for four sectors each time one block of data is read from the CD-ROM. Storage areas (RAMN
o0 and RAM No. 1) have a storage capacity of 4096 bytes that can store data for two blocks.

First, as shown in FIG.
One block (data block No. 0) of data is read from the CD-ROM disc in the ROM drive device 1a. At this time, the timing of writing the data to the RAM buffer unit 11 is set at
A write timing generation circuit 1 in accordance with the timing of reading the data from the ROM drive device 1a;
4 by the timing signal generated. Here, as shown in FIG. 3B, when the data of the first one block (data block No. 0) is accumulated in one storage area (RAM No. 0) of the RAM buffer unit 11, the end of the accumulation is waited. Then, the reading of the data is started, and the read data is transferred to the FD interface 10. At this time, the timing of reading the data from the RAM buffer unit 11 is set by a timing signal generated by the read timing generation circuit 15 in accordance with the transfer speed of the FD interface 10.

On the other hand, even if the transfer of the data to the FD interface 10 is started, the data stored in the RAM buffer unit 11 is not yet full, so the CD-R
Subsequently, in the OM drive device 1a, the CD-RO
Next one block from M disk (data block N
The reading of the data of o1) is performed, and the read data acts so as to be accumulated in the RAM buffer unit 11. At this time, in the RAM buffer section 11, the data write timing and the data read timing collide, and the collision of these timings is detected by the write timing generation circuit 14, and the detected output at that time is output. By being supplied to the spare buffer unit 16, the data is written to the spare buffer unit 16 instead of being written to the RAM buffer unit 11. When the data read timing in the RAM buffer unit 11 ends, the data written in the spare buffer unit 16 is transferred to the RAM buffer unit 11 and accumulated in the other storage area (RAM No. 1) of the RAM buffer unit 11. Is done.

As described above, one storage area (RAM No. 0) and the other storage area (R No.
AM No. 1) is shifted in time, and the data is accumulated in the RAM buffer unit 11. If the data of the second block (data block No. 1) is read from the CD-ROM, RA
The storage capacity of the M buffer unit 11 becomes full of data. Then, when the RAM buffer unit 11 is full of data, the reading of the data in the CD-ROM drive device 1a is interrupted by a full detection signal sent by the RAM full detection unit 17, and after the interruption, the RAM buffer unit 1
When the transfer of the data of the first one block (data block No. 0) stored in No. 1 to the FD interface 10 is completed, the data of the next one block (data block No. 1) is transferred to the FD interface 10. Things.

Next, all the data stored in the RAM buffer unit 11 is read out, and when the two storage areas (RAM No. 0 and RAM No. 1) become empty, the CD-ROM is read.
In the ROM drive device 1a, the track of the CD-ROM disc is jumped by one track, and the CD-ROM disc is read.
The next one block (data block No. 2) of data is read from the ROM disk, and the empty R
One storage area of the AM buffer unit 11 (RAMNo0)
, And then the next one block (data block No. 3) from the CD-ROM disc
Is read out and stored again in the other storage area (RAM No. 1) of the emptied RAM buffer section 11. The data writing timing and data in the RAM buffer section 11 in the course of this operation are Operation when the read timing of the
The operation of reading the data stored in the RAM buffer unit 11 is the same as the above-described operation.

Hereinafter, the above-described operations are repeatedly performed until all data to be read from the CD-ROM disk is read.

As described above, according to the buffering means of the present embodiment, data with a high read speed in the CD-ROM drive device 1a can be efficiently transferred to the FD interface 10 with a low transfer speed.
The data transfer delay in the D interface 10 can be minimized.

The buffering means of the present embodiment is similar to that of FIG.
As shown in (c), the RAM buffer unit 11 is divided by a unit storage capacity (2 Kbytes) and has four storage areas (RAMNo0, RAMNo1, RAMNo2, RA
Even in the case of having MNo3), substantially the same operation as in the above-described case is performed, and substantially the same operation and effect as in the above-described case can be obtained. Then, four storage areas (RAMNo0, RAMNo1, RAMNo2, RAM
No. 3) when using the RAM buffer unit 11 having two storage areas (RAM No. 0, RAM No. 1), compared to when using the RAM buffer unit 11 having two storage areas (RAM No. 0 and RAM No. 1).
Although there is a disadvantage that the recording capacity of the AM buffer unit 11 is doubled, there is an advantage that the period during which neither data writing nor data reading is performed in the RAM buffer unit 11 can be significantly reduced.

In the embodiment shown in FIG. 1, the recording / reproducing apparatus optically reproduces (reads) recorded data.
The case where the recording / reproducing apparatus of the present invention is a CD player is described as an example. However, the recording / reproducing apparatus of the present invention is not limited to the case of a CD player, and magnetically reproduces (reads) recorded data. Magnetic recording and reproducing device.

Further, in the embodiment shown in FIG. 1, the case where the recording / reproducing apparatus performs only the reproduction (reading) of the recording data has been described as an example. The present invention is not limited to a recording / reproducing apparatus that performs only reproduction (reading), and may be a device that performs recording (writing) of data and reproduction (reading) of recorded data as in the magnetic recording / reproducing apparatus.

When the recording / reproducing apparatus is a recording / reproducing apparatus which records data and reproduces recorded data, not only does the recording / reproducing apparatus transfer read data to the personal computer but also transfers the read data from the personal computer. Needless to say, the read data is transferred to the recording / reproducing device side and is recorded on the recording medium of the recording / reproducing device side.

[0046]

As described above, according to the present invention,
Just by providing a personal computer interface unit with a simple configuration, a personal computer with an FD drive device and a CD-ROM
PC and Inter between CD players having a disc drive device can be <br/> interface
There is an effect that it is possible to obtain a recording / reproducing apparatus capable of performing face-to-face recording .

According to the present invention, the format (FD) of data processed on the FD drive device side of the personal computer
And format), even if the format of the data processed by the CD player side (CD format) and is not significantly different, such as obtained command in FD drive device
Data de-format, Ri due to be passed to the central control unit of the CD player (CPU), CD player
This makes it possible to execute a data processing operation in accordance with the content of the command or the like.

Further, according to the present invention, the transfer rate of the data read from the recording / reproducing apparatus side is significantly different from the transfer rate of the data transferred to the personal computer side through the transmission section, and the transfer rate of the data buffer section is small. Even if the storage capacity is used, without lowering the transfer rate of data transmitted to the personal computer through the transmission unit,
There is an effect that the data can be effectively transferred.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus capable of interfacing with a personal computer according to the present invention.

FIG. 2 is a block diagram showing an example of the configuration of a buffering means employed in the embodiment shown in FIG.

FIG. 3 is an explanatory diagram showing a timing relationship between data read from a CD-ROM disk and data writing and data reading in a RAM buffer unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CD-ROM mechanism, 1a CD-ROM drive device 2 Central control unit (CPU) arrange | positioned inside CD player 3 CD signal processing LSI (high density integrated circuit) 4 CD servo LSI 5 Host interface (I / F) Unit 6 receiving unit 7 command / status buffer unit 8 buffer control unit 8a data buffer unit 9 transmitting unit 10 FD interface (I / F) 11 RAM buffer unit 12 first address generation counter 13 second address generation counter 14 write timing Generation circuit 15 Read timing generation circuit 16 Spare buffer unit 17 RAM full detection unit

Claims (4)

(57) [Claims] A CD-RO is controlled by a central control unit.
Recording data on M disk and / or CD-ROM data
A CD player that plays back recorded data
CD player and floppy disk interface
Connected to an externally connected personal computer with
PC interface consisting of a
And a receiving unit, wherein the receiving unit is connected to the personal computer.
Supplied through the floppy disk interface
Serial data in floppy disk format
Is a CD format suitable for the CD-ROM disc
After formatting to the serial data of
It is to be supplied to the layer side, the transmitting unit,
Buffer control of data supplied from CD player
Received this data and use this data on a floppy disk.
After adding sector information, cylinder information, etc.
Floppy disk format suitable for floppy disks
The floppy disk as serial data.
Supply to the personal computer through the interface
Wherein the buffer control unit is the CD-ROM
A device that temporarily stores data read from a disk
Personal computer and the interface capable of recording and reproducing apparatus, characterized in that it is. 2. The personal computer interface unit includes a host interface unit that functions to notify the central control device that data including a command or the like has been supplied from at least the personal computer to the receiving unit. The personal computer and the interface according to claim 1,
Face-ready recording and playback device. 3. The buffer control unit includes a data buffer, selectively stores data read from the recording medium in a predetermined amount in the data buffer, and stores the stored data in the predetermined amount. 3. The personal computer according to claim 1, wherein the transmission unit sequentially transfers the data, and the temporary storage of the data and the transfer of the data are alternately performed at a predetermined timing. 4. Recording / playback device that can be interfaced . 4. The buffer control unit further includes a spare buffer, and when the timing of the temporary accumulation of the data and the timing of the transfer of the data coincide, the data is accumulated in the spare buffer. 4. The personal computer and interface according to claim 3, wherein after the data transfer is completed, the data is transferred to the data buffer.
Possible recording and playback device.