JPH10177764A - Optical disk recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform optimum buffer memory control in accordance with trans fer capability of a host computer side in a DRAW type optical disk recording device. SOLUTION: The number of data transferred together from a host 101 to an optical disk recording device 102 is stored in a buffer control section 109, when a buffer memory 108 is filled by data from the host 101, a disk recording control section 110 starts recording in a disk 111. After start of recording, data of the buffer 108 is reduced, when a space for the number of data transferred together from the host 101 is produced, a buffer control section 109 permits transfer of the next data to the host 101. After finish of transferring data, the buffer 108 is filled, the maximum margin for holding continuity of recording data in a disk can be obtained, while as the host 101 can transfer all data equivalent to one time at once, transfer for the shortest time can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus and the like, and more particularly, to a method for buffering recorded data.

[0002]

2. Description of the Related Art As an example of a recordable optical disk device, there is a recording device for a CD-WO (write-once) optical disk. This CD-WO recording device is connected to a host computer, and data to be recorded is stored in the host computer. In general, the data is transferred by a bus-type high-speed interface. In particular, in the case of a CD-WO, recording data must be continuously recorded on a disk at a constant speed, and since data cannot be erased, data transfer must be controlled so as to maintain a constant speed without interruption. If the data is interrupted during the recording, the series of data cannot be used, and the recording is restarted from the beginning.

In order to maintain the continuity of the data transfer, it is necessary for the host computer to always prepare data to be recorded. The host computer employs a so-called on-the-fly system in which the recording data is transferred in parallel while creating the recording data. ing. That is, the host computer and the CD-
A method is used in which a data buffer of a semiconductor memory is inserted between WOs, data from a host is once stored in the data buffer, and the data is supplied from the data buffer to a CD-WO disk. However, optimal control of the buffer according to the transfer capability of the host computer has not been performed.

[0004]

In order to maintain the continuity of data transfer, the host computer must always prepare data to be recorded. In the current CD-WO recording, a method in which a host computer creates recording data and transfers the recording data in parallel is called an on-the-fly method.

[0005] This conventional method is economical because it is not necessary to prepare a large-capacity hard disk for creating recording data on the host side, but the host computer creates and transfers recording data in parallel. Therefore, the transfer time must be minimized in order to take enough time to create the recording data.

In order to transfer the recording data at one time, a sufficient free area is secured in the buffer on the optical disk recording apparatus side, and when the standby is performed in a state where the free area is large, the buffer is liable to become completely empty. Is a factor that is interrupted.

Further, if data transfer is started when there is not enough free space in the buffer, the buffer becomes full in the middle of the data transfer, and after that, recording on the disk proceeds to wait for free space in the buffer. However, there is a problem that the host cannot prepare the next recording data while waiting during the data transfer.

[0008]

In order to solve the above-mentioned problems, an optical disk recording apparatus according to the present invention comprises means for storing the number of data to be transferred at one time from a host computer, and detecting the free space in the buffer memory. Means for performing, when the free space of the buffer memory is smaller than the number of transfer data, the transfer of the recording data from the host computer to the buffer memory is prohibited, and the free space of the buffer memory is equal to the number of transfer data. When they are equal to or larger than each other, the recording data is transferred from the host computer.

According to the present invention, at the timing when a space corresponding to the number of recording data to be transferred to the buffer memory is created, the control to start the data transfer from the host computer is performed, so that all the necessary data from the host computer can be transferred. An optical disk recording device that can transfer data to the buffer memory in the shortest time can be realized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk recording according to a first aspect of the present invention includes an interface for transferring information to and from a host computer holding data to be recorded on the optical disk, and an interface from the host computer via the interface. An optical disk recording apparatus having a buffer memory for storing recording data to be transferred to the optical disk storage apparatus for recording the recording data stored in the buffer memory on an optical disk, the transfer included in a write command from the host computer to the optical disk storage apparatus. Means for storing the number of data, and means for detecting the free space in the buffer memory, wherein when the free space in the buffer memory is smaller than the number of data to be transferred, transfer of the recording data from the host computer to the buffer memory. Is prohibited and the buffer memory is free. When the amount is equal to or larger than the number of transfer data, the transfer of the record data from the host computer is performed, and the space corresponding to the number of record data transferred at one time to be transferred to the buffer memory is transferred. By performing control to start data transfer from the host computer at the timing when the data is obtained, it is possible to realize an optical disk recording device capable of transferring all required data from the host computer to the buffer memory in the shortest time.

Next, an optical disk recording apparatus according to a second aspect of the present invention provides an interface for transferring information to and from a host computer holding data to be recorded on an optical disk, and an interface from the host computer via the interface. An optical disk recording device having a buffer memory for storing the recording data to be transferred to the optical disk device and recording the recording data stored in the buffer memory on an optical disk; Means for counting the number of data as one packet, storing the data amount of the packet, and means for detecting the free space of the buffer memory, and when the free space of the buffer memory is smaller than the one packet, Prohibit transfer of recording data from host computer When the free space of the buffer memory is consistent with data of the one packet, or greater,
The recording data is transferred from the host computer, wherein an interval of data transfer is measured on the optical disk device side, and when the interval is longer than a predetermined time, the data is separated there.
By setting the data amount of the number of blocks in the meantime to one packet, optimal control can be realized even when the number of data transferred at a time is different from the block number information of the write command.

(Embodiment 1) An embodiment according to claims 1 and 2 of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1A, 101 is a host computer, 102 is an optical disk recording device, and 103 is an interface bus. The host computer 101 and the optical disk recording device 102 are connected to an interface bus 10.
3 is connected. The CPU 106 creates recording data using the main memory 105, and transfers the data from the interface control unit 104 to the interface control unit 107 of the optical disc recording device 102 via the interface bus 103. The recording data is stored in the buffer memory 108, from which the buffer control unit 10
9 is sent to the disk recording control unit 110 and recorded on the magnetic disk 111. Interface bus 10
Reference numeral 3 includes a plurality of control signals CTL in addition to the data bus as shown in FIG. 1B, and the data transfer timing is controlled by the handshake of the REQ signal and the ACK signal among the control signals.

A buffer control unit 109 which is a main part of the present invention.
2 is shown in FIG. In FIG.
Represents an address bus, and 202 represents a data bus, which connects each component to a buffer memory. Control CPU 203
Then, control of data transfer from the host computer, counting of the number of transfer data, management of data stored in the buffer memory 108, monitoring of free space, recording instructions to the disk recording control unit 110, and the like are performed. The a1 register 204 stores an address value indicating the head of the recording data storage area of the buffer memory 108. The a2 register 205 stores the address value of the buffer memory 108 in a state where a free area equal to the number of data transferred at one time from the host computer is left. The block counter 206 stores block number information of the write command. Buffer memory 10
8, the (a0-a3) range is the entire region, a0 is the bottom,
If a3 is the top, the (a0-a1) range is the recording data area, and (a2-a3) is the area equal to the number of data transferred at one time from the host computer. The value of the block counter 206 is equal to the number of blocks indicated by (a2-a3). In this configuration, a1 = a2 or a
When 1 <a2, data transfer from the host is performed and a1
When> a2, control is performed to prohibit transfer.

A1 register 204, a2 of the present embodiment
For the register 205, the block counter 206, and the like, a part of the buffer memory 108 can be used instead.

The write command configuration includes a write command 301 and recording data 302 as shown in FIG. The X block in the write command indicates that there is an X block of data to be transferred. The recording data 302 in one block unit differs depending on the type like CD-DA or CD-ROM data, but is from 2048 bytes to 2352 bytes.
The capacity is on the order of one block with a capacity of about a byte. Control CPU
203 is the number of blocks X when the write command is received.
Is stored in the block counter 206. Further, the data capacity is calculated from the number of blocks X and the number of bytes per block, and the address value of a2 is calculated. As a calculation example, 1
When the block is 2352 bytes, a2 = a3− (X block × 2352).

When data transfer is executed following the write command, data is stored in the buffer memory 108. When one block is received, the value of a1 increases by one. When some data is stored in the buffer memory 108, the CPU 20
3 instructs the disc recording control unit 110 to start recording.
The disk recording control unit 110 reads data from the buffer memory 108 and records the data on the disk. When one block is recorded, the value of a1 decreases by one. The buffer memory 108 which is full due to the data transfer from the host is a1
= A3, but recording on the disk proceeds and a1
Decreases to a2, the CPU 203 permits the next data transfer request from the host through the interface control unit.

The host transmits the write command again, but immediately starts data transfer if the number of transfer blocks at this time is X blocks. However, if the number of transfer blocks is Y blocks and different from X blocks, the CPU 203
Stores the number of blocks Y in the block counter 206, and a
The value of a2 is also updated as 2 = a3− (Y block × 2352). If the new a2 satisfies the relationship of a2 <a1, the CPU 203 inhibits the data transfer again, and the data in the buffer memory 108 is recorded on the disk and a1
Wait for the value to decrease. When a2 = a1 again, data transfer is permitted. By executing this control, it is possible to flexibly cope with a change in the number of transfer blocks for each write command.

(Embodiment 2) Next, claim 2 of the present invention
The embodiment of the invention described in (1) will be described with reference to FIG.

FIG. 4 is a timing chart showing the operation of the interface bus 103 during data transfer. The time chart in FIG. 4A shows a write command and a recording data sequence following the write command, and transfer is performed by handshaking REQ and ACK. Upon receiving the write command, the CPU 203 counts the number of blocks to be transferred to the block counter 206.
In the buffer memory 1 as described above.
REQ is issued to the host via the interface control unit 107 at an optimal time according to the situation of 08. The host outputs data to the data bus.
Issue K. The interface control unit 107 receives ACK
Then, the data is fetched, and this is repeated. For example, when transferring at 4 MB / sec, the cycle T1 = 250n
sec, and 2352 bytes per block,
It takes 588 μsec.

The time chart of FIG. 4B shows the state of transfer in block units. T2 represents an interval between blocks, and the value differs depending on the capability of the host, but is a constant interval as long as the same host is used. Therefore, the transfer time per block Tb + T2
Is the total time of one block transfer.

The timer 207 in FIG. 2 is connected to the CPU 203 and can measure Tb and T2.
When the transfer starts, the CPU 203 measures Tb and T2, and simultaneously counts how many blocks have been received at the same Tb + T2 interval. When the interval of T2 is longer than a predetermined normal value, the CPU 203 stops counting there, stores the count as the number of data transferred at one time in the block counter 206, and sets the number of blocks to 1
Packets can be optimally controlled in the buffer memory 108.

That is, the size of the packet can be determined and set by the optical disk recording apparatus, and even if the number of data transferred at one time differs from the number of blocks included in the write command, the buffer memory can be used. It is possible to optimize the control of the free space and the transfer time of the 108.

[0024]

As described above, according to the optical disk recording apparatus of the present invention, the buffer memory can be used to the maximum extent by measuring and holding the amount of data transferred from the host, and until the buffer becomes empty. Time can be maximized. In addition, when data transfer from the host is started, an empty area for the transfer data is provided in the buffer memory, so that the transfer can be performed in the shortest time, and the host can make the most of the processing time other than the data transfer, and Use efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an optical disc recording apparatus showing an embodiment of the present invention.

FIG. 2 is a block diagram of a buffer memory control unit of the optical disc recording apparatus.

FIG. 3 is a diagram schematically showing commands used for data transfer of the optical disc recording apparatus.

FIG. 4 is a time chart showing a data transfer method of the optical disc recording apparatus.

[Explanation of symbols]

 101 Host Computer 102 Optical Disk Recording Device 103 Interface Bus 104, 107 Interface Control Unit 108 Buffer Memory 109 Buffer Control Unit 204 a1 Register 205 a2 Register 206 Block Counter 207 Timer

Claims (2)

[Claims] 1. An interface for transferring information to and from a host computer holding data to be recorded on an optical disc, and a buffer memory for storing recording data transferred from the host computer via the interface, An optical disk recording apparatus for recording the recording data stored in the buffer memory on an optical disk, comprising: a unit for storing a transfer data number included in a write command from the host computer to the optical disk storage device; Means for detecting, when the free space of the buffer memory is smaller than the number of transfer data, the transfer of the recording data from the host computer to the buffer memory is prohibited, and the free space of the buffer memory becomes equal to the number of transfer data. Matches or is greater than Optical disk recording apparatus characterized by the transfer of recording data from the serial host computer. 2. An interface for transferring information to and from a host computer holding data to be recorded on an optical disc, and a buffer memory for storing recording data transferred from the host computer via the interface, In an optical disk recording device for recording the recording data stored in the buffer memory on an optical disk, the number of recording data transferred at one time from the host computer to the optical disk device is counted as one packet, and the data amount of the packet is calculated. Means for storing, and means for detecting free space in the buffer memory, wherein when the free space in the buffer memory is smaller than the one packet, transfer of recording data from the host computer is prohibited, The free space of the packet is When data quantity match, or greater, the optical disc recording apparatus characterized by the transfer of recording data from the host computer.