JPH0765500A - Recording/reproducing device capable of performing i/f with personal computer - Google Patents

Abstract

PURPOSE:To perform IF between a personal computer and a CD player by converting data read out from a CD-ROM in a prescribed way after storing them in a buffer and transferring them to the personal computer. CONSTITUTION:The data incorporating a command, etc., received from the host personal computer 10 by a reception part 5 are stored in a command/status buffer part 7 temporarily to be transferred to the CPU 2 at need. Further, by a buffer control part 8, the data read out from the CD-ROM and processed by a CD signal processing LSI 3 are written in a data buffer 8a, and the stored data are read out to be transferred to a transmission part 9. The transferred data and the status of the buffer part 7 are formated so as to fit into an FD format by the transmission part 9 to be transferred to the FD driving device of the personal computer 10. Thus, the CD player capable of performing the I/F between the personal computer 10 and the CD player is provided.

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 the data on the recording medium, and more particularly to an externally connected personal computer having an FD (floppy disk) drive unit. Recording / reproducing apparatus capable of interfacing with a personal computer).

[0002]

2. Description of the Related Art Generally, 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. You can

First, focusing on the media, FD
Has a small storage capacity of at most 4MB (megabytes), both sides of the disk are used, and
The CD-ROM disc has a large storage capacity of about 600 MB, whereas only one side of the disc is used and only the reproduction of data is possible, while the medium is capable of both recording and reproducing data. There is a big difference in terms of media.

Focusing on drive devices that handle these media, the FD drive device and the CD-ROM drive device are different in various points, as shown in Table 1 below, based on the difference in characteristics of the media. The characteristics are very different.

[0005]

[Table 1]

In summary of the above points, the FD drive device can be said to be a subordinate drive device which is directly controlled by the control circuit on the personal computer board.
The D-ROM drive device is an intelligent drive device that receives commands and parameters from the host personal computer and manages the execution of the CD-ROM disc by the drive itself, and has the same characteristics as the HD (hard disk) drive device. It is what

Thus, the FD drive device and the CD-R
Since there is a great difference in characteristics between the personal computer having the FD drive device and the CD player having the CD-ROM drive device, there is still an attempt to interface with the personal computer having the FD drive device. I haven't.

[0008]

By the way, in order to read the data by connecting the FD drive device of the personal computer to the CD-ROM drive device of the CD player through the personal computer interface, various kinds of data will be described below. Must be overcome and the realization must be achieved.

First, the FD interface signal of the personal computer is used to receive commands and parameters from the personal computer side and pass them to the CD player side. At the same time, status data and vendor data from the CD player side are transmitted. It is necessary to deliver to the personal computer side, and the means for delivering these are realized.

Second, 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 absorbed. It is necessary to absorb the difference,
Implementation of a data buffering mechanism that executes these.

Thirdly, since the FD drive device can only process data conforming to the physical format of the FD, that is, the FD format, the data transferred from the CD player side to the personal computer side is converted into the FD format. Formatter to convert and F received from PC
A deformatter for converting D format data into a format that can be used by a CD-ROM drive device is required, and it is necessary to realize a conversion device that achieves these functions.

The present invention has been made to overcome the above problems and realizes the same. 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. It is to provide a recording / reproducing apparatus capable of performing the above.

[0013]

In order to achieve the above-mentioned object, the present invention records data on a recording medium and / or reproduces data on the recording medium under the control of a central control unit arranged inside the device. In the recording / reproducing device, receive data including commands from the externally connected personal computer side,
A receiving unit that supplies the commands and the like to the central control unit, a buffer control unit that temporarily stores the data read from the recording medium, and the data that is received from the buffer control unit and that data is converted into a predetermined format. It is provided with a means having an interface section including a transmitting section for converting and transmitting to the personal computer side.

[0014]

According to the above means, the receiving unit receives the data including the command and the like from the FD drive device of the externally connected personal computer, and after deformatting the data in the FD format into the data in the normal format, The command or the like is accessed from the data to a central control unit (CPU) arranged inside the recording / reproducing apparatus. Therefore, even if the data format processed by the FD drive device side of the personal computer and the data format processed by the recording / reproducing device side are significantly different,
By deformatting the command or the like from the FD drive device and passing it to the central controller of the recording / reproducing device, it is possible to cause the recording / reproducing device to execute the data processing operation corresponding to the content of the command or the like. become.

The buffer control unit writes the data read from the recording / reproducing apparatus into a data buffer provided in association with the buffer control unit, while transferring the data read from the data buffer to the transmission unit. I am trying. For this reason, the transfer speed of the data read from the recording / reproducing device side and the transfer speed of the data transferred to the personal computer side through the transmitting unit are significantly different, and the data buffer having the minimum storage capacity is used. Even if it does, the data can be effectively transferred without reducing the transfer rate of the data to be transmitted to the personal computer side through the transmitting unit.

[0016]

Embodiments of the present invention will now be described 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 as a recording / reproducing apparatus to a CD player for reproducing a CD-ROM. is there.

In FIG. 1, 1 is a CD-ROM mechanism, 2 is a central control unit (CPU) arranged inside the 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 the CD player side area,
II indicates the personal computer interface side area, and III indicates the personal computer side area.

In the area I on the CD player side, the CD-ROM mechanism 1 uses an optical pickup for optically detecting the data recorded on the CD and the radius of the CD by controlling the optical pickup by the CD servo LSI 4. And a slide mechanism that appropriately moves in a direction. The CD signal processing LSI 3 includes a conversion / amplification unit that converts analog data read from the CD through the optical pickup into digital data, a frequency demodulation unit that demodulates the digital data by EFM (Extended Frequency Modulation), and the demodulated digital data. An error correction unit for correcting the error of (1) and a rotation control unit for controlling the number of rotations of the CD are provided, and 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 an optical spot on the CD, a tracking control unit that performs tracking control of the CD, and a control system that performs slide control. These components are also included in the central controller 2 The above-mentioned processing is performed by the instruction.

In addition, the personal computer interface side area II
2, the host interface unit 5 detects the FD drive device operating on the personal computer side and the start of serial data transfer from the personal computer side, and in the CD-ROM mechanism 1, the CD-ROM disc. Functions such as notifying the computer that the has been replaced. The receiving unit 6 deformats the FD format serial data transferred from the personal computer side into normal format data, and transfers the 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 when the central control unit 2 requests them, reads the commands or parameters and transfers them to the central control unit 2. Let
At the same time, it temporarily stores the drive status and media information to be transferred to the personal computer. The buffer control unit 8
When the data transferred from the CD signal processing LSI 3 is accumulated in the data buffer unit 8a and can be transferred to the personal computer side, the accumulated data is read from the data buffer unit 8a and transferred to the transmission unit 9. To 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 area III on the personal computer side, 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, and among these pins, the 2nd pin is the FD Signal indicating type (HIGH DENS
ITY) The signal (I
N USE), the drive 3 selection signal (DRIVE SEL
ECT 3), 8th pin is a pulse signal output every 1 rotation of FD
(INDEX) Drive 0 selection signal (DRIVE
SELECT 0), drive 1 selection signal (DRI
VE SELECT 1), drive 2 selection signal (D
RIVE SELECT 2), motor start command signal (M
OTOR ON), head movement direction designation signal (D
IRECTION), a signal to move the head (STEP) on the 20th pin, and write data (WRI) to the FD on the 22nd pin.
TE DATA), a signal (WRITE GATE) for instructing the writing of data to the 24th pin, and the head is track 0 for the 26th pin.
Signal indicating that you are above (TRACK 0), F on pin 28
A signal indicating that writing of data to D is prohibited (WRITE PROTEC
T), the 30th pin is a reproduction data signal from the FD (READ DA
TA), pin 32 is a signal (SI
DE SERECT) and the 34th pin are assigned a signal (DISK CHANGE) indicating that the FD has been exchanged, and the remaining odd-numbered pins are assigned the ground potential.

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

First, serial data including write data to the FD in the FD format and commands and parameters in the FD format is 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 the data recorded on the CD-ROM disc is read out, and the parameter is the CD-ROM.
It indicates how much recording data is read from which address on the disc. Next, when the receiving unit 6 receives the serial data, the serial data in the FD format is reformatted into the data in the normal format, each data of the command and the parameter sent from the personal computer side is taken out, and these data are converted into a command / command. It is transferred to the status buffer unit 7 and accumulated. At this time, the host interface unit 5 notifies the central control unit 2 that a command has been issued from the personal computer side, and the central control unit 2 that has received this notification is already stored in the command / status buffer unit 7. The command in the data is read, and the command type is interpreted as a read (read) command.
Subsequently, the central controller 2 reads the parameters in the data, causes the optical pickup to access the address to be read in the CD-ROM disc, and after the access, reads the data from the CD-ROM disc, 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 transmits the transferred data to the data buffer unit 8a,
Store it there temporarily. When a certain amount of data is accumulated in the data buffer unit 8a, the buffer control unit 8
Reads out the data accumulated in the data buffer unit 8a and causes the transmitting unit 9 to transmit the data. When the transmission unit 9 receives the data from the buffer control unit 8, the FD is added to the data.
After adding information such as sectors and cylinders used in, the FD interface 10 is formatted as a FD format and serialized.
Through the computer. On the personal computer side, the CD-ROM in this transferred serial data
The read data is read out and stored in the FD.

In this case, a series of operations after the reading of the data from the CD-ROM disc is continuously executed as long as the data to be read remains in the CD-ROM disc in the central control unit 2. When the central controller 2 finishes reading all the data to be read, the series of operations is finished.

Although the description so far has been made in the case where the central control unit 2 detects a read command, when the central control unit 2 detects another command, for example, a command indicating the initial state of the drive is issued. When the detection is performed and the fact is read out to the personal computer side, substantially the same operation as the above-described operation is performed. However, at the time of reading the initial state of the drive, the status data is transferred instead of transferring the data read from the CD-ROM disc to the personal computer side. At this time, when the personal computer receives the status data, it can know that the drive is operating normally or abnormally by extracting the status from the status data.

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

Normally, a primary storage device composed of a RAM or the like is used for such buffering means. In the embodiment shown in FIG. 1, however, the following structure is adopted. .

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

In FIG. 2, 1a is a CD-ROM drive device, 11 is a RAM buffer unit, 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 section, and 17 is RA.
The M-full detector, and other components that are the same as those shown in FIG. 1 are denoted by the same reference numerals.

The RAM buffer section 11 is a CD-
The data read from the CD-ROM disc in the ROM drive device 1a is received through the spare buffer unit 16 and is temporarily stored. The first address generation counter 12 counts up according to the data reading speed in the CD-ROM drive device 1a,
The second address generation counter 12 is counted up according to the data transfer rate 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 timing of the writing is generated, and the read timing generation circuit 15 transfers the data from the RAM buffer unit 11 to the FD interface 10. In doing so, a timing signal for setting the timing of reading data in the RAM buffer unit 11 is generated. Spare buffer unit 16
When the data writing timing and the data reading timing collide with each other in the RAM buffer section 11, the data is temporarily stored in the RAM buffer section 11 in order to prioritize the data reading timing. The RAM full detection unit 17 detects that the RAM buffer unit 11 is full of accumulated data and generates a full detection signal.

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

In FIG. 3, (a) is the data read from the CD-ROM disc, (b) is the storage capacity of the RAM buffer section 11 of 4 Kbytes (2 Kbytes × 2), and (c) is the same storage capacity. Is 8 Kbytes (2 Kbytes x
4 shows data writing and data reading in the case of 4).

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

However, in this example, it is assumed that no data is stored in the RAM buffer section 11 and it is empty. Further, the RAM buffer unit 11 is divided into storage units each having a storage capacity (2 Kbytes in this example), and writing and reading of data to and from the RAM buffer unit 11 are based on the storage capacity of each unit. Is done. In addition, in the CD-ROM,
The storage capacity of the above unit is often expressed as one block unit, and the data size of one block is usually 2
It is in units of 352 bytes. Also, of the 2352 bytes of data, the effective data on the FD interface 10 side is 2048 bytes. In this case, the FD interface 10 has 512 bytes in one sector, and data of four sectors can be transferred each time one block of data is read from the CD-ROM. Storage areas (RAMN
The storage capacity of o0 and RAM No1) is 4096 bytes capable of accumulating two blocks of data.

First, as shown in FIG. 3A, CD-
Data for one block (data block No0) 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 to CD
A write timing generation circuit 1 according to 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 for the first one block (data block No0) is accumulated in one storage area (RAMNo0) of the RAM buffer unit 11, the end of the accumulation is awaited. 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 with respect to the RAM buffer unit 11 is set by the 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 when the transfer of the data to the FD interface 10 is started, the data accumulated in the RAM buffer section 11 is not yet full, and therefore the CD-R.
In the OM drive device 1a, subsequently, the CD-RO
The next one block from the M disk (data block N
The data of (o1) is read, and the read data is stored in the RAM buffer unit 11. At this time, the data write timing and the data read timing collide with each other in the RAM buffer section 11. The collision of these timings is detected by the write timing generation circuit 14, and the detection output at that time is detected. 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. Then, at the time 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 No1) of the RAM buffer unit 11. To be done.

As described above, one storage area (RAM No0) of the RAM buffer section 11 and the other storage area (R
If the data writing to the AM No1) is staggered in time and the data is accumulated in the RAM buffer unit 11, when the reading of the data of the second block (data block No1) from the CD-ROM is completed, RA
The storage capacity of the M buffer unit 11 becomes full of data. When the RAM buffer section 11 is full of data, the RAM full detection section 17 sends a full detection signal to interrupt the reading of the data from the CD-ROM drive device 1a. 1
When the transfer of the first 1-block (data block No0) data stored in 1 to the FD interface 10 is completed, the next 1-block (data block No1) data is transferred to the FD interface 10. It is something.

Next, when all the data accumulated in the RAM buffer section 11 is read and the two storage areas (RAM No0, RAM No1) become empty, the CD-
In the ROM drive device 1a, a track of a CD-ROM disc is jumped by one track to make a CD-ROM disc.
The next one block (data block No. 2) of data is read from the ROM disk, and the empty R is read.
One storage area of the AM buffer unit 11 (RAM No0)
The data is stored again in the CD-ROM disc, and then the next one block from the CD-ROM disc (data block No. 3)
Data is read out and stored again in the other storage area (RAM No1) of the emptied RAM buffer unit 11, and the timing of writing data and the data in the RAM buffer unit 11 in the process of this operation Operation when there is a collision with the reading timing of
The operation of reading the data stored in the RAM buffer unit 11 is the same as those operations described above.

Thereafter, the above-described operations are repeatedly executed until all the data to be read from the CD-ROM disc is read.

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

Further, the buffering means of this example is shown in FIG.
As shown in (c), the RAM buffer unit 11 is divided by a unit storage capacity (2 Kbytes), and four storage areas (RAMNo0, RAMNo1, RAMNo2, RA).
Even in the case of having MNo3), substantially the same operation is performed as in the case described above, and substantially the same action and effect as in the case described above can be obtained. And four storage areas (RAM No0, RAM No1, RAM No2, RAM
When the RAM buffer unit 11 having No. 3) is used, R is larger than when the RAM buffer unit 11 having two storage areas (RAM No0, RAM No1) is used.
On the other hand, there is a disadvantage that the recording capacity of the AM buffer unit 11 is doubled, but on the other hand, 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) the recorded data.
However, the recording / reproducing apparatus of the present invention is not limited to the case of the CD player, and magnetically reproduces (reads) the recorded data. It may be a magnetic recording / reproducing device that is installed.

Further, in the embodiment shown in FIG. 1, the case where the recording / reproducing apparatus only reproduces (reads) the recorded data has been described as an example, but the recording / reproducing apparatus of the present invention is The magnetic recording / reproducing apparatus is not limited to a recording / reproducing apparatus that only reproduces (reads), and may record (write) data and reproduce (read) recorded data as in the magnetic recording / reproducing apparatus.

When the recording / reproducing device is a recording / reproducing device for recording data and reproducing the recorded data, not only the read data is transferred from the recording / reproducing device side to the personal computer side, but also from the personal computer side. It goes without saying that the read data is transferred to the recording / reproducing apparatus side and recorded on the recording medium on the recording / reproducing apparatus side.

[0046]

As described above, according to the present invention,
Only by adding a simple circuit, a personal computer having an FD drive device and a recording / reproducing device (for example, a C-ROM disc) having a drive device for a recording medium (for example, a CD-ROM disc).
There is an effect that it is possible to obtain a recording / reproducing device (for example, a CD player) capable of interfacing with a D player.

According to the present invention, even if the data format processed by the FD drive device side of the personal computer and the data format processed by the recording / reproducing device side are significantly different, the command from the FD drive device Etc. are reformatted and the central control unit (CP
By passing the data to U), it is possible to cause the recording / reproducing apparatus to execute the data processing operation in accordance with the contents 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 greatly different from the transfer rate of the data transferred to the personal computer side through the transmitting section, and the data buffer section is small. Even if the storage capacity is used, without reducing the transfer rate of the data to be transmitted to the personal computer side through the transmission unit,
There is an effect that the data can be effectively transferred.

[Brief description of 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 configuration diagram showing an example of a configuration of a buffering unit adopted in the embodiment shown in FIG.

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

[Explanation of symbols]

1 CD-ROM mechanism, 1a CD-ROM drive device 2 Central control unit (CPU) arranged inside the CD player 3 CD signal processing LSI (high density integrated circuit) 4 CD servo LSI 5 Host interface (I / F) Part 6 Receive part 7 Command / status buffer part 8 Buffer control part 8a Data buffer part 9 Transmitter part 10 FD interface (I / F) 11 RAM buffer part 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 (5)

[Claims] 1. A recording / reproducing apparatus for recording data on a recording medium and / or reproducing data on the recording medium under the control of a central control unit arranged inside the apparatus, including a command from an externally connected personal computer side. Received data,
A receiving unit that supplies the commands and the like to the central control unit, a buffer control unit that temporarily stores the data read from the recording medium, and the data that is received from the buffer control unit and that data is converted into a predetermined format. A recording / reproducing apparatus comprising an interface section including a transmitting section for converting and transmitting the converted data to the personal computer side. 2. The personal computer interface section includes a host interface section that functions to inform the central control unit that at least data including a command and the like has been supplied to the receiving section from the personal computer side. The recording / reproducing apparatus according to claim 1, which is characterized in that. 3. The buffer control unit includes a data buffer, selectively stores the data read from the recording medium in predetermined amounts in the data buffer, and stores the stored data in the predetermined amount. 3. The recording / reproducing according to claim 1, wherein the recording / reproducing is performed to the transmitting unit one by one, and the temporary storage of the data and the transfer of the data are alternately performed at a predetermined timing. apparatus. 4. The buffer control unit further includes a spare buffer, and stores the data in the spare buffer when the temporary storage of the data and the transfer of the data coincide in timing, 4. The recording / reproducing apparatus according to claim 3, wherein after the transfer of the data is completed, the data is re-stored in the data buffer. 5. The recording / reproducing apparatus according to claim 1, wherein the recording medium is a CD-ROM disc, and the recording / reproducing apparatus is a CD player.