JPH0721566A - Cd-rom device with quick access mechanism - Google Patents

Abstract

PURPOSE:To shorten seek time and to shorten access time by providing the two pairs of optical pickups and selecting either a mode to select the pickup closer to a target track or a mode to simultaneously read data from the respective pickups concerning the respective optical pickups. CONSTITUTION:When first and second data transfer means 10 and 11 and a data selecting means 9 are completely prepared, the optical pickup at the position of the target track is selected by an optical pickup selecting means 4, and the read of data is instructed through a control line 109 or 110 to a first data reading means 7 or a second means 8. At the time of a compatible mode, the read data are sent through a data line 205 or 206, means 9 and data line 204 to the means 10 and sent from a data line 200 through a data line 202 and an interface part 1 to a host device 30. At the time of a new mode, data read by the first pickup are sent to the means 9, and data read by the second pickup are sent to the means 11 and reported to the device 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing device,
In particular, the present invention relates to a CD-ROM device for reading data from a disc as a CD-ROM medium at high speed.

[0002]

2. Description of the Related Art Generally, when reading data on a CD-ROM medium (disk) stored in a spiral or concentric form, a CD-ROM device moves its optical pickup in the radial direction of the disk and is used for the purpose. The track is read out and read when a predetermined sector of the rotating disk reaches the position of the optical pickup.

However, since the conventional CD-ROM device has only one optical pickup for reading data in the head of the disk drive, the previous command (seek and read data) is completed. Until, the following commands cannot be issued. Therefore, there has been a problem that the read time is extended by the waiting time of the seek.

However, in recent years, as the amount of data handled by computer systems has increased, CD-R
It has been required to hold a large amount of data even in the OM device. Therefore, it takes a long time to move the optical pickup to a target track of the disc, which causes a reduction in access performance in the CD-ROM device.

From this point of view, a CD-type disc of this type is conventionally used.
In the ROM device, the seek waiting time required for moving the head of the disk drive is set to be substantially zero.
For example, when inputting a search code consisting of N digits when searching for data on the disk, the disk drive is moved to the corresponding data position in the disk each time one digit or character is input without waiting for the input of all the digits of the search code. No. 1-134782, there is proposed a method of accelerating the data retrieval, that is, the data reading by configuring the head to perform the preceding seek.

As a means for rapidly accessing data to the disk as compared with the above-mentioned high-speed access means for the disk by the conventional soft air processing, for example, in a magnetic disk device, a plurality of heads are independently provided for a predetermined disk. A plurality of head drive mechanisms for moving the head drive mechanism to each position and a magnetic disk drive having a control circuit for independently controlling these head drive mechanisms, and a command from a plurality of CPUs to the control circuit to control the heads with respect to the disk. A magnetic disk having a control unit for independently performing data read / write processing, reading data written by one head with another head, and comparing both data to check that the data has been written correctly. Proposal of a system with a control device It is (JP-A-62-24405
Issue). That is, the magnetic disk device configured as described above can perform data writing and reading operations on the disk with a half-rotation delay, and the controller compares the data to check the disk write data. It can be performed quickly and the reliability of write data can be improved with a small overhead. In addition, since two independent disk access mechanisms and circuits can be used during parallel access operations to disks, there is no need to wait for access of other CPUs when accessing one CPU, improving system responsiveness. Is something that can be done.

[0007]

However, in the above-mentioned conventional apparatus, in the former data reading method,
Although it is possible to appropriately shorten the timing when moving the head, there is a limit to the improvement of responsiveness in a multimedia system that requires parallel processing of data because of a single optical pickup. is there.

Further, as shown in the latter magnetic disk control device, in the case where a plurality of heads are arranged on the disk and each head is controlled independently, parallel access to the disk is possible. However, no proposal has been made to reduce the access time by each head in this case.

Therefore, an object of the present invention is to provide two sets of optical pickups, select a mode for the optical pickups closer to the target track for each optical pickup, and simultaneously set data for each optical pickup. It is possible to shorten the moving time of the optical pickup (the time required for the seek), to shorten the access time to the disc and to improve the data access performance, by setting the mode for reading each of the data to be selected. It is to provide a CD-ROM device with a high-speed access mechanism.

[0010]

In order to achieve the above object, a CD-ROM device with a high-speed access mechanism according to the present invention comprises an interface unit for exchanging data, commands and the like with a host device and a host device. Command interpreting means for interpreting the received command, command control means for giving a command to each part by the received command to execute the command, and optical pickup selecting means for selecting an optimum head from two sets of optical pickups, First and second optical pickup control mechanisms for respectively controlling the positions of the first and second optical pickups, and the first and second optical pickup control mechanisms.
First and second data reading means for reading data from each of the optical pickups, data selecting means for controlling which data of the two sets of optical pickups is to be transferred, and the read data for each of the upper side devices. It is characterized by comprising first and second data transfer means for transferring the data to the device and an operation mode determining means for setting an operation mode.

CD-ROM with high-speed access mechanism
In the apparatus, the interface unit includes two sets of data transfer interfaces corresponding to the first data transfer unit and the second data transfer unit as external interfaces, and one of the sets of data transfer is set by the operation mode determining unit. It is possible to select a mode in which the interface is used and a mode in which two sets of data transfer interfaces are simultaneously used.

[0012]

Operation: CD-RO with high-speed access mechanism according to the present invention
According to the M device, two sets of optical pickups are provided, a mode for selecting an optical pickup closer to a target track for each optical pickup, and a mode for simultaneously reading data from each optical pickup. By selecting and, it is possible to shorten the movement time (time required for seeking) of the optical pickup, reduce the access time to the disc, and improve the data access performance.

[0013]

EXAMPLE Next, C with a high-speed access mechanism according to the present invention
An embodiment of the D-ROM device will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block circuit diagram of a CD-ROM device with a high speed access mechanism according to the present invention. That is, in FIG. 1, C with a high-speed access mechanism of the present embodiment
The D-ROM device includes an interface unit 1 for exchanging data, commands and the like with an upper device and a command interpreting means 2 for interpreting a command received from the upper device.
And a command control means 3 for giving a command to each part by the received command to execute the command, an optical pickup selecting means 4 for selecting an optimum head from two sets of optical pickups, and a position of the first optical pickup. And a second optical pickup control mechanism 6 for controlling the position of the second optical pickup.
A first data reading means 7 for reading data from the first optical pickup, a second data reading means 8 for reading data from the second optical pickup, and data of one of the two sets of pickups. Data selection means 9 for controlling whether to perform transfer, first data transfer means 10 for transferring the read data to the higher-level device, and second data transfer means 11 for transferring the read data to the higher-level device. , And an operation mode determining means 12 for setting an operation mode.

In this embodiment, a CD-ROM
Two sets of heads 41 and 42 are provided to the disk 40 as a data access mechanism.
A first optical pickup (1) and a second optical pickup (2) are provided for the first and second heads 42, respectively.

However, the CD-ROM device 20 with a high-speed access mechanism according to the present invention is provided with two sets of data transfer interfaces as external interfaces, and only one set is used, which is different from the conventional CD-ROM device. A compatible mode (hereinafter, referred to as a compatible mode) and a CD-RO in a host device by using two sets at the same time.
In consideration of the fact that the M device has two sets of optical pickups, a mode for performing faster data access (hereinafter, referred to as a new mode) is selected and set to operate.

These operation modes are selected and determined in advance by the operation mode determination means 12 and transmitted to the command control means 3 through the control line 111. That is, in the compatibility mode, the optical pickup that is closer to the target track is selected from the two optical pickups, and data is read. In the new mode, the upper device 30 issues a command to each of the two optical pickups to read data.

Therefore, the upper device 30 can improve the access performance by issuing the command to the other optical pickup even before the command issued last time is completed.

Next, the specific operation of the CD-ROM device with the high-speed access mechanism according to this embodiment having the above-mentioned structure will be described.

CD-R with high-speed access mechanism shown in FIG.
When the OM device 20 receives a command issued from the higher-level device 30 via the disk control line 100, the OM device 20 fetches it into the command interpreting means 2 via the interface section 1 and the control line 101. Then, the command interpreting means 2 interprets the received command and determines whether it is a seek type command or a read type command accompanied by data transfer.

However, in the case of a seek type command, the command interpreting means 2 informs the command control means 3 via the control line 102 that the command for moving the optical pickup to the target track number is issued. Inform. Then, the command control unit 3 instructs the optical pickup selection unit 4 via the control line 103 to move the optical pickup to the target track. The optical pickup selecting means 4 determines whether any one of the heads 41 and 42 of the first optical pickup and the second optical pickup is near the target track, and determines the two heads 41 and 42.
Select which to use. And the control line 10
7 or via the control line 108, the first optical pickup control mechanism 5 or the second optical pickup control mechanism 6 is instructed to move the optical pickup to a target track. And it was confirmed that this operation was completed,
This is notified to the command control means 3, and further the higher-level device 30 is notified that the seek command has been completed.

On the other hand, in the case of a read type command, the command interpreting means 2 informs the command control means 3 via the control line 102 that a command for reading data has been issued.
Let us know. Then, the command control means 3 uses the control line 1
The first data transfer unit 10 and the second data transfer unit 11 are notified that data is read via 04 and 105. Also, via the control line 106,
In the compatible mode, the read data is selected from the selected one of the first and second optical pickups, and in the new mode, the data read from the first optical pickup is selected. Data selection means 9 for selecting
Instruct and prepare.

In this way, the first data transfer means 1
0, when the second data transfer means 11 and the data selection means 9 are ready, the optical pickup selection means 4 selects the optical pickup at the target track position, and the control line 109 or the control line 110 is used. Then, the first data reading means 7 or the second data reading means 8 is instructed to read the data.

In the compatible mode, however, the read data is sent to the first data transfer means 10 via the data line 205 or the data line 206, the data selection means 9 and the data line 204, and then the data line. 202, device 3 above the data line 200 via the interface unit 1
Sent to 0.

On the other hand, in the new mode, the data read from the first optical pickup is sent to the first data transfer means 10 via the data line 205, the data selection means 9 and the data line 204, and Device 3 higher than data line 200 via data line 202 and interface unit 1
It is transmitted to 0. Further, the data read from the second optical pickup is sent to the second data transfer means 11 via the data line 207, and then the device above the data line 201 via the data line 203 and the interface unit 1. Passed to 30. Finally, it is confirmed that the read system command has been completed, and the higher-level device 30 is notified.

[0026]

As is apparent from the above-described embodiments, according to the CD-ROM device with the high-speed access mechanism according to the present invention, two sets of independent optical pickups are provided, and the target track is provided for each optical pickup. By selecting the mode in which the optical pickup closer to the optical pickup is selected and the mode in which data is read simultaneously for each optical pickup, the time required for the optical pickup to move to the target track is shortened, With this device, you can improve access performance without being aware of it.
It has advantages such as easy inheritance of conventional assets.

In addition, by the software on the upper side, the CD
-In the case of being aware that the ROM device has two sets of optical pickups, each optical pickup is accessed independently, and data can be obtained at a higher speed. Not only the effect can be exerted in the case of random access, but also the effect can be exerted in a system in which high reliability is required as a device in which the optical pickup is duplicated.

Further, by storing two different types of data in the CD-ROM, for example, image data and voice data in advance, each optical pickup can read out and use the two types of data at the same time. It is also possible to build a media system.

[Brief description of drawings]

FIG. 1 is a CD-RO with a high-speed access mechanism according to the present invention.
It is a block circuit diagram which shows one Example of M apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 interface part 2 command interpreting means 3 command controlling means 4 optical pickup selecting means 5 first optical pickup controlling mechanism 6 second optical pickup controlling mechanism 7 first data reading means 8 second data reading means 9 data selecting means 10 First Data Transfer Means 11 Second Data Transfer Means 12 Operation Mode Determining Means 20 CD-ROM Device 30 Upper Device 40 CD-ROM Disk 41 First Head 42 Second Head 101-111 Control Lines 200- 207 data line

Claims (2)

[Claims] 1. An interface unit for exchanging data, commands and the like with a higher-level device, a command interpreting means for interpreting a command received from a higher-level device, and a command given to each unit by the received command to execute the command. Command control means for selecting, and an optical pickup selecting means for selecting an optimum head from the two sets of optical pickups,
First and second optical pickup control mechanisms for respectively controlling the positions of the first and second optical pickups;
First and second data reading means for reading data from the first and second optical pickups, data selecting means for controlling which data is transferred from the two sets of optical pickups, and the read data, respectively. A CD-ROM device with a high-speed access mechanism, comprising first and second data transfer means for transferring data to a higher-level device and operation mode determining means for setting an operation mode. 2. The interface section comprises two sets of data transfer interfaces corresponding to the first data transfer means and the second data transfer means as external interfaces, and one of the sets of data is set by the operation mode determining means. 2. A CD-ROM device with a high-speed access mechanism according to claim 1, wherein a mode using a transfer interface and a mode using two sets of data transfer interfaces at the same time can be selected.