JP2866432B2 - CD-WO device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a CD-WO (Compact Disc-Write Once) device.

[Prior Art] CD-ROM (Compact Disc-Read Only)
In a type such as a memory) or a CD-I (compact disk-interactive), in which data is not written on a CD by a user, a format for writing data on the CD is already determined. On the other hand, a system for writing and reading data to and from a disc in a format similar to the format of a CD-ROM has also been developed for a type such as a CD-WO in which a user can write data to a CD. Is being done. In this specification, a CD refers to a recording medium in which digital information is optically or magnetically read on a rotating disk, and is not limited in its size.

In the format of a CD-ROM or CD-I, as shown in FIG. 3, a sync pattern in which data for identifying one block is recorded in one block of 2352 bytes according to the mode and form, A which is time information on CD
EDC which is header for recording data that defines time and mode, user data, and data for error detection
(Error detection code), error correction code (ECC),
Further, the CD-I is provided with sub-headers that define the type, format, form, and the like of user data, and these constitute one block.

Since the processing of the user data is performed in a so-called host system unit other than the component that actually writes information on the CD, the so-called drive system unit, for example,
When writing data to a CD by CD-WO, data such as the sync pattern described above must be added to the user data possessed by the host system in either the host system unit or the drive system unit. .

If these are added by the host system, the load on the central processing unit (hereinafter referred to as CPU) and the memory increases, which is not efficient. Also, the A-time data recorded in the header data portion may be sequentially incremented for each block, and the mode is usually constant within a track. It is more efficient to generate and add them.

Accordingly, an object of the present invention is to provide a CD-WO device in which data such as a sync pattern, a header, and a subheader is added by a drive system unit in the CD-WO device.

Means for Solving the Problems The present invention provides a host system unit for storing write data to be written to an optical disk, and a drive system to which the write data is supplied from the host system unit and performs an operation of writing the write data to the optical disk A CD-WO device for writing information on an optical disc in a format conforming to the provisions of a CD-ROM and a CD-I, wherein the host system unit stores user data in the write data in the drive system unit. The drive system unit includes a control unit that controls the operation of each component by being supplied with data from the host system unit, and data other than user data included in the write data according to the format. A data creation unit that creates the data under the control of the control unit; A write / read memory for storing the user data supplied from the unit and data other than the user data created by the creation unit in accordance with the format, and transferring the data written in the memory to the optical disc. A data transmission unit that transmits the data to a signal processing circuit that performs data processing for writing.

[Operation] Since the drive system unit creates predetermined data other than the user data in the data creation unit, the drive system unit acts to reduce the load on the CPU and memory provided in the host system unit.

[Embodiment] In FIG. 1 showing a configuration of an embodiment of a drive system unit provided in a CD-WO device of the present invention, an output of a host interface 1 to which user data for recording on a CD of a host system is supplied. The side is connected to an address bus 2, a data bus 3, and an arbitration circuit 4, which will be described later, provided in circuit elements constituting the drive system unit. Also, address bus 2 and data bus 3
Is connected to a buffer RAM 5 for storing various data such as a sync pattern recorded on a CD, so that user data sent from the host system is transferred via the host interface 1 and the data bus 3 by DMA or program transfer. It is stored in the buffer RAM5. Buffer RAM5
Is divided into pages for each block. For example, CD-I
When writing the data of Form 1, the host system stores 2048 bytes of user data of each page from the relative address address 24 to the address 2071 shown in FIG. The above-mentioned block corresponds to a sector when information is written on a floppy disk which is a magnetic recording medium.

The system controller 6 independently sends and receives commands to and from the host system, receives from the host system the initial value of the header, the value format of the subheader, and the number of transfer blocks, which are data to be recorded on the CD, from the host system, and operates the components in the drive system. Is a circuit that controls The output side of the system controller 6 is connected to the control circuit 7, the header data generation circuit 9, the subheader data register 10, the address generation circuit 11, the sequencer 12, and the system controller data bus 15.

The output side of the control circuit 7 includes an arbitration circuit 4, a sync pattern generation circuit 8, a header data generation circuit 9,
The sub-header generation circuit 10, the address generation circuit 11, the sequencer 12, and the enable terminals of the buffers connected to the outputs of the components 8 to 11 are connected. Such a control circuit 7 is a sequencer 12 that starts operating when a synchronization signal is supplied from the host system.
The operation is started by a control signal supplied from the controller, and the control signal is supplied from the system controller 6 to control the operation of the components 8 to 11 and to transmit the data generated by these components. Controls the operation of the arbitration circuit 4. The output side of each of the components 8 to 10 is connected to the data bus 3 via the buffer, and the output side of the address generation circuit 11 is connected to the address bus 2 via the buffer.

The sync pattern generation circuit 8 is a circuit that generates a sync pattern defined by the standards of CD-ROM and CD-I.

The header section data generation circuit 9 includes a system controller 6
This is a circuit in which data of the initial value of the A-time supplied is set, incremented by an instruction from the control circuit 7, and sequentially transmitted. The value of the mode byte in the header is set by the system controller 6, but among all the blocks recorded on the CD at once, the first three blocks and the last three blocks are specially controlled by the control circuit 7. Is controlled to generate a simple code.

The sub-header data register 10 is a circuit that receives the value of the sub-header from the system controller 6 and stores the value.

The address generation circuit 11 is a circuit for generating an address for writing data such as the sync pattern and the header into the buffer RAM 5 so as to correspond to the format shown in FIG.

The arbitration circuit 4 is a circuit for generating a signal for adjusting the write of the data such as the sync pattern and the header into the buffer RAM 5 when the write collision occurs.

The output side of the sequencer 12 is connected to the control circuit 7 and an EDC / ECC adding circuit 13 for adding EDC / ECC data, and the sequencer 12 informs that the data generated by the constituent parts 8 to 10 has been stored in the buffer RAM 5. Is supplied from the control circuit 7, the operation of the EDC / ECC addition circuit 13 is started.

The EDC and ECC adding circuit 13 is a circuit for calculating EDC and ECC data in accordance with the standards of CD-ROM and CD-I, and its output side is an address bus 2, a data bus 3, and an arbitration circuit 4. Connected to. Therefore, EDC, ECC additional circuit 1
3, after each data such as the above-mentioned sync pattern and header is stored in the buffer RAM 5, EDC and ECC data are transferred to the buffer RAM 5 through the data bus 3 under the control of the sequencer 12.
Remember in 5.

The serial interface 14 is connected to the address bus 2, the data bus 3, and the arbitration circuit 4, and is a page for which data such as a sync pattern, a header, user data, EDC, and ECC constituting one block has been added to the buffer RAM 5. Is read via the data bus 3, and
The read data is transmitted serially to a signal processing circuit at the next stage which performs data processing for writing data to the CD.

The operation of the CD-WO device configured as described above will be described below with reference to FIGS. In FIG. 2, S1, S2
.. Represent steps 1, 2 and so on. In the flowchart shown in FIG.
M blocks are stored.

In step 1, when the command is supplied from the host system to the system controller 6, the system controller 6 writes the initial value of the header data supplied from the host system into the header data generation circuit 9, and the sub header data register 10 Write subheader data to Further, the system controller 6 instructs the control circuit 7, the address generation circuit 11, and the sequencer 12 about the format of the block configuration. Further, user data is transmitted from the host system, and the host interface 1,
The data is stored in the buffer RAM 5 via the data bus 3.

In step 2, it is determined whether or not the block to be stored can be stored. If the block cannot be stored, the process ends. If the block can be stored, the process proceeds to step 3.

In step 3, a signal is sent from the system controller 6 to the sequencer 12, so that the sequencer 12 sends an operation start signal to the control circuit 7. Therefore, the control circuit 7
The sync pattern generation circuit 8 and the address generation circuit 11 are operated. Therefore, the sync pattern data generated and transmitted by the sync pattern generation circuit 8 is written to the relative addresses 0 to 11 in the buffer RAM 5 in accordance with the address transmitted by the address generation circuit 11 via the data bus 3.

The next step 4 is to start with 3 blocks from the first block of the total number of blocks recorded on the CD at one time.
This is a step related to the case of creating a block consisting of the first block and the last block from the third block from the last block. When ordinary user data is recorded, the processing of step 4 is not performed and Move to step 5.

The first and last three blocks of these total blocks are
Special data is recorded because the writing of data to a CD may become unstable. That is, step 4-
In 1, the first block and the last block are to be processed, and these blocks are added with header data and become link blocks. In step 4-2, the second block from the beginning is to be processed, and header data is added to this block, and first run-in data is added. In step 4-3, the third block from the beginning is to be processed. In this block, second run-in data to which header data has been added is added. In step 4-4, the third block from the last is to be processed. In this block, header data is added and first run-out data is added. In step 4-5, the second to last block is to be processed. In this block, header data is added and second run-out data is added.

When a control signal is supplied from the outside to the header part data generation circuit 9, a function is provided for selecting whether to output the A time written by the system controller 6 as it is or to output it after incrementing it. Link block, first run-in block, second run-in block
Block, user data, first run out
By providing a function that can generate a mode byte according to the block and the second run-out block,
A system in which the flow shown in FIG. 2 is automatically executed can be realized.

In steps 5 and 6, as in step 3 described above, the system controller 6 operates the header data generation circuit 9 and the subheader data register 10, and outputs the header data and subheader data transmitted from these circuit elements. Are respectively written to predetermined addresses in the buffer RAM 5. Mode 1 on CD-ROM
In such a case that 0 is written at a predetermined address in one block, predetermined data is written at a predetermined address.

When the data of the sync pattern, header, and subheader is stored in the buffer RAM 5, the control circuit 7 sends a signal to the sequencer 12, and the sequencer 12 drives the EDC / ECC addition circuit 13 by receiving the signal. Therefore,
In steps 7 and 8, EDC and ECC data are stored in the buffer RAM 5 from the EDC and ECC adding circuit 13 via the data bus 3.

By the above operation, one block is completed, and the data constituting this block is stored in the data bus 3,
Via the serial interface 14, the data sent from the serial interface 14 for recording data on a CD is sent to a signal processing circuit for signal processing.

In step 10, the number of blocks recorded on the CD is counted, and the process returns to step 2 again to perform the same processing as described above.

In FIG. 2 and the above description, the data transfer from the host system and the data transmission from the serial interface 14 have been described as a sequential flow for easy understanding. However, these processes are actually pipelined. Executed in parallel.

As described above, by creating each data of the sync pattern, the header, the subheader, the EDC, and the ECC in the drive system unit and configuring the blocks in a predetermined format, the load on the CPU and the memory in the host system can be reduced. it can. Further, the amount of data supplied from the host system to the drive system unit can be reduced.

In addition, since the data of the sync pattern, header, and subheader are added in advance to the address of the buffer RAM5 corresponding to the format, the EDC and ECC data encoding circuit can be added by adding a part of the EDC and ECC decoding logic and a small circuit. Can be realized.

Further, since the header corresponding to the increment of the A-time and the link, run-in, and run-out blocks is automatically generated and added, the load on the software of the system controller can be reduced.

[Effects of the Invention] As described above in detail, according to the present invention, a drive system unit constituting a CD-WO device creates predetermined data other than user data to be recorded on a CD. Thus, the load on the memory can be reduced, and the CD-WO device can be operated efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the CD-WO device of the present invention, FIG. 2 is a flowchart showing the operation of the device shown in FIG. 1, and FIG. 3 is the device shown in FIG. FIG. 3 is a diagram showing a configuration of a block used. 1 Host interface 4 Arbitration circuit 5 Buffer RAM 6 System controller 7 Control circuit 8 Sync pattern generation circuit 9 Header data generation circuit 10 … Subheader data register, 11… Address generation circuit, 12 …… Sequencer, 13 …… EDC / ECC addition circuit, 14 …… Serial interface.

Claims (1)

(57) [Claims] A host system for storing write data to be written to an optical disk; and a drive system for supplying the write data from the host system and writing the write data to the optical disk. In a CD-WO device for writing information on an optical disc in a format conforming to the ROM and CD-I specifications, the host system unit sends user data in the write data to the drive system unit, and the drive system unit Creates a control unit that controls the operation of each component by supplying data from the host system unit, and creates data other than user data included in the write data according to the format under the control of the control unit And a user supplied from the host system unit. A writable and readable memory that stores data and data other than the user data created by the creation unit according to the format, and performs data processing to write the data written in the memory to the optical disc. A data transmission unit for transmitting the data to a signal processing circuit.
WO device.