JPH03164843A - Optical disk processing device - Google Patents

Abstract

PURPOSE:To perform the high-speed processing by providing a microprocessor for optical disk and that for semiconductor memory and sending first read data to a host system at the time of reading a disk. CONSTITUTION:In a semiconductor memory processing part 20, a write instruction is received through a second host interface control circuit 21 by a second microprocessor 24 to write data in a semiconductor memory 22. Since write to the semiconductor memory is normally limited to data whose frequency in use is high, the write data volume to the semiconductor memory is smaller than that to the optical disk. A first microprocessor 16 and the second microprocessor 24 simultaneously read and retrieve data in response to the write instruction from a host system 1, and one microprocessor which first finds data gets the right of priority to send data to the host system 1. Thus, the high-speed processing is possible.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk processing device for recording and reproducing.
In particular, the present invention relates to a disk processing device that processes data at high speed.

[Prior Art] A block diagram of a conventional optical disk processing device is shown in FIG. This optical disc processing device has the following circuits, etc. A host interface control circuit 11 connected to the host system 1, a data buffer 12 connected to the host interface control circuit 11, an error correction circuit 13 connected to the data buffer 12, and an error correction circuit 13 connected to the error correction circuit 13. A modulation/demodulation circuit 14° that is connected to the modulation/demodulation circuit 14 and a drive interface control circuit 15 that is connected to the destination disk drive device 2. A microprocessor 16 and a sector format control circuit 17 can be connected to each of the interface control circuits 15.In future disk processing devices, optical disks will be After writing information to the medium, a verify operation is performed, and information is written to a replacement sector area assigned to a group of a plurality of sectors for defective sectors. Furthermore, a pointer or an address map indicating the self address, replacement destination address, and replacement address is used to allocate a replacement sector to an error source sector during writing or reading.

By the way, there is no known optical disk processing device that has a built-in semiconductor memory. In other words, there has not been an optical disk processing device that has a separate microprocessor and semiconductor memory therein, and that searches for data on the semiconductor memory at the same time as it accesses the optical disk medium.

[Problems to be Solved by the Invention] In conventional optical disk processing devices, defective sector replacement processing is performed by adding pointers indicating the replacement destination address and replacement address to the data section and writing the data onto the optical disk medium. are doing. Furthermore, a method is used in which the relationship between defective original sectors and replacement sectors is written in a replacement information map area. Therefore, the conventional optical disk processing apparatus has the disadvantage that data processing time becomes longer when the optical disk medium has many defects.

Furthermore, since optical heads are heavier than magnetic heads, optical disk devices cannot seek at higher speeds than magnetic disk devices. Therefore, an optical disk device and a semiconductor disk device are sometimes used together to perform high-speed data processing.

However, since there is no direct interface between the destination disk device and the semiconductor disk device, all necessary data must be transferred from the optical disk device to the semiconductor disk device via the host system. In this case, since it takes time to transfer data, high-speed processing of data is not possible after all.

An object of the present invention is to provide an optical disc processing device that can process data at high speed.

[Means for Solving the Problems] In order to achieve the above object, an optical disc processing apparatus according to the present invention has the following features.

That is, in a disk processing device having a first host interface control circuit connected to a host system and a first microprocessor, the first host interface control circuit is connected to the host system and the first host interface control circuit. a second host, an interface control circuit; a semiconductor memory capable of storing data from the host system and the first microprocessor; and a second host interface control circuit that controls operations of the second host interface control circuit and the semiconductor memory. It has a microprocessor, and a communication control circuit that controls transmission and reception of information between the first microprocessor and the second microprocessor.

Preferably, the semiconductor memory is provided with a backup power source. Further, a communication control circuit may be provided for each microprocessor.

[Operation] The first microprocessor and the second microprocessor receive and receive instructions from the host system via the first host interface control circuit and the second host interface control circuit, respectively, and process the instructions. Execute. If this command is a write command, the first microprocessor writes data to the optical disk medium. At the same time, if necessary, the second microprocessor receives write data via the second host interface control circuit and writes this data into the semiconductor memory. The data written to the semiconductor memory is usually frequently used data.

If the instruction from the host system is a read instruction, the first microprocessor executes an operation of reading data from the optical disk medium. At the same time, the second microprocessor also executes an operation of reading data from the semiconductor memory. The data of the first microprocessor and the second microprocessor that read the data faster is sent to the host system. If the data is stored in semiconductor memory, the second microprocessor will usually read the data faster, so this data is sent to the host system. When the corresponding data is not stored in the semiconductor memory, the first microprocessor sends the data on the optical disk to the host system.

[Example] Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the invention. The optical disc processing device of this embodiment includes an optical disc processing section 1.
0 and a semiconductor memory processing section 2o.

The configuration of the optical disc processing section 1o is similar to that of a conventional optical disc processing device.

In FIG. 1, the same reference numerals are used for the same components as in the conventional system (FIG. 3).

The semiconductor memory processing section 20 has the following circuits, etc. A second host interface control circuit 21 connected to the host system 1 and the first host interface control circuit 11; a semiconductor memory 22 connected to the second host interface control circuit 21; a semiconductor memory 22 connected to the optical disk processing unit 10; A communication control circuit 23 connected to the second host interface control circuit 21, a semiconductor memory 22, and a communication control circuit 23 connected to the second microprocessor 24.Next, the optical disc processing of this embodiment is performed. The operation of the device will be explained. The operation of the optical disc processing section 10 is the same as that of a conventional optical disc processing device. That is, when a write command is received from the host system 1, the write command is manually inputted to the first microprocessor 16 via the first host interface control circuit 11 in the optical disc processing section 10. In the first microprocessor 16, an optical head (not shown) is connected to the optical disk drive device 2 via the drive interface control circuit 15.
instructs to move to the specified address. Next, the first microprocessor 16 operates the first host interface control circuit 11 to receive write data. Write data from the host system 1 is sent to the first host interface control circuit 1.
1 to the data buffer 12 and stored there. Further, the data stored in the data buffer 12 is encoded by an error correction circuit 13, an error correction code is added thereto, and the data is sent to a modulation/demodulation circuit 14.

This write data is then modulated by the modulation/demodulation circuit 14 and sent to the optical disc drive device 2 via the drive interface control circuit 15. At this time, the write format generated by the sector format control circuit 17 is also sent to the optical disc drive device 2 via the drive interface control circuit 15.

Then, data is written.

After the write operation is completed, a verify check operation is performed using the data stored in the data buffer 12. If a write abnormality is discovered through this verify check operation, replacement sector processing is performed. In this verify check stage, defective data is checked under conditions that are stricter than in the actual data reading operation in the decoding operation of the error correction circuit.

On the other hand, in the semiconductor memory processing section 20 , the write command is received by the second microprocessor 24 via the second host interface control circuit 21 , and data is written into the semiconductor memory 22 . Writing to semiconductor memory is usually limited to frequently used data, so
The amount of data written to the semiconductor memory can be smaller than the amount of data written to the optical disk.

When there is a read command from the host system 1, the first microprocessor 16 of the optical disc processing unit 10 controls the optical head of the optical disc drive device 2 via the drive interface control circuit 15, as in the case where there is a write command. instructs to move to the specified address. Read data is sent to sector format control circuit 17 via drive interface control circuit 15 . Sector format control circuit 17
, the data part of the read data and the address (ID
) part is recognized, and furthermore, timing of the reading position is generated, and this timing is sent to the modulation/demodulation circuit 14 and the error correction circuit 13.

The read data is demodulated in the modulation/demodulation circuit 14. Then, in the error correction circuit 13, the read data uses an error correction code to calculate the error occurrence position and error pattern, and if there is an error, it is corrected. The error-corrected data is stored in the data buffer 12. If there is no error in the read data after error correction, the read data is sent to the host system 1 via the first host interface control circuit 11.

If there is an error in the read data after error correction, the optical head is moved to a replacement sector area, the corresponding sector is searched, and the data of the corresponding sector is sent to the host system 1.

On the other hand, in the semiconductor memory processing section 20, the read command is received by the second microprocessor 24 via the second host interface control circuit 21, and it is checked whether the semiconductor memory 22 contains the corresponding data. If the corresponding data is present, an interrupt is issued to the first microprocessor 16 via the communication control circuit 23 to stop reading from the previous disk. Then, the corresponding data in the semiconductor memory 22 is sent to the host system 1. semiconductor memory 2
If there is no corresponding data in 2, the first microprocessor 16 is not interrupted and the first microprocessor 1 sends the read data to the host system 1 via the first host interface control circuit 11. . In addition, if there is a possibility that this read data will be read frequently in the future, this data is transferred to the semiconductor memory processing unit 20 side via the first host interface control circuit 11 and the second host interface control circuit 21. send.

This data is recorded on semiconductor memory 22 by second microprocessor 24.

To summarize the above read operation, in response to a read command from the host system 1, the first microprocessor 1
6 and the second microprocessor 24 simultaneously read and retrieve data.

The person who finds the relevant data first gets priority.
Send the relevant data to the host system 1.

Normally, the read speed of a semiconductor memory is faster, so when the corresponding data is stored in the semiconductor memory, the data will be read from the semiconductor memory. This enables high-speed processing.

In addition, as another method of using this optical disk processing device,
- It is also possible to transfer a large amount of data on the optical disk medium to the semiconductor memory 22 and store it in response to a command, and then specify the second microprocessor 24 and the semiconductor memory 22 to process the commands of the host system 1 at high speed.

Next, a block diagram of a second embodiment of the present invention is shown in FIG. In this second embodiment, a backup power supply 2 dedicated to the semiconductor memory 22 is added to the optical disk processing apparatus of the first embodiment.
5, and a first communication control circuit 18 and a second communication control circuit 26 are provided in place of the communication control circuit 23. First communication control circuit 18 is connected to first microprocessor 16 . Second communication control circuit 26
is connectable to the second microprocessor 24;
And it is connected to the first communication control circuit 18.

The basic operation of the second embodiment is similar to that of the first embodiment. However, since the backup power supply 25 is provided, the data in the semiconductor memory 22 is preserved even when the power is turned off, and from the second use onward, high-speed processing can be performed using only the time required to access the semiconductor memory 22. Further, since the communication control circuit is provided separately for the first disk processing section 10 and the semiconductor memory processing section 20, the first disk processing section 10 and the semiconductor memory processing section 20 can be separated.

[Effects of the Invention] As explained above, the present invention provides a first microprocessor for optical disks and a second microprocessor for semiconductor memory, so that data can be stored in the semiconductor memory as needed. I have to. A communication means is provided between both microprocessors. When reading data, both microprocessors are operated and the data read faster is sent to the host system. As a result, the present invention has the following effects.

(1) Frequently used data can be stored from an optical disk into a semiconductor memory without the intervention of a host system.

(2) Data stored in the semiconductor memory can be read only by accessing the semiconductor memory.

(3) Data on an optical disk medium can be stored in semiconductor memory according to commands from the host system, so by backing it up with a battery, you can supply programs for fast system startup and data supply at high speed. It can be carried out.

(4) Due to the above effects, the optical disk processing device of the present invention can be used as a memory with a learning function or as a system disk for high-speed system start-up.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is a block diagram of a second embodiment, and FIG. 3 is a block diagram of a conventional optical disc processing apparatus. 1... Host system 10... Optical disk processing unit 11... First host interface control circuit 16...
. . . First microprocessor 18 . . . First communication control circuit 20 . . . Semiconductor memory processing unit 21 . . . Second host interface control circuit 2
2...Semiconductor memory 23...Communication control circuit 24...Second microprocessor 26...Second communication control circuit

Claims (1)

[Scope of Claims] An optical disk processing device having a first host interface control circuit connected to a host system and a first microprocessor, the optical disk processing device having a first host interface control circuit connected to the host system and the first host interface control circuit. a second host interface control circuit for controlling operations of the second host interface control circuit and the semiconductor memory; a semiconductor memory capable of storing data from the host system and the first microprocessor; 1. An optical disc processing device comprising: a second microprocessor; and a communication control circuit that controls transmission and reception of information between the first microprocessor and the second microprocessor.