JPH05128528A - Optical disk device - Google Patents

Abstract

PURPOSE:To enhance the transfer rate and the access speed of an optical disk device and to reduce the waiting time of the device requesting a piece of data. CONSTITUTION:A plurality of heads 2, 3 are arranged on one recording face of an optical disk (two heads in the case of the figure). In addition, a plurality of head controllers 9, 10 which control the heads and a plurality of interfaces to the outside are provided. The plurality of heads are sought simultaneously, different tracks are accessed simultaneously and pieces of data by them are sent collectively whenever necessary. Thereby, the transfer rate and the access speed of the title disk apparatus can be enhanced. When the plurality of interfaces are provided, the waiting time for many access requests can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary storage device for an information processing device, and more particularly to control of an optical disk device such as a CD-ROM, a write-once type, a rewritable type.

[0002]

2. Description of the Related Art Conventionally, an optical disk device of this type has an optical head for writing / reading data (hereinafter referred to as a head), a head controller for controlling head positioning, and an interface with an external device. have.

[0003]

Since the above-mentioned conventional optical disk device has only one head, one head controller, and one interface, the performance of the optical disk medium (hereinafter referred to as a disk) depends on the moving speed of the head. There is a drawback in that the processing time of the system is reduced due to the limitation and the inability to simultaneously satisfy a plurality of write / read requests.

An object of the present invention is to have a plurality of write / read heads, head controllers, and interfaces each of which can be individually controlled, and to individually control each of the heads, thereby eliminating the above-mentioned drawbacks and reducing the number of heads. When a small number of data access commands are issued, multiple head controllers can be used for one interface to increase the speed multiple times, and data access requests that are equal to or greater than the number of heads are issued. In this case, heads will be assigned in the order of issue or priority,
To provide an optical disk device capable of maximizing the operation of a plurality of heads operating at the same time, a head controller connected to the head, and an interface, resulting in speeding up by the number of heads, and reducing waiting time for a large number of access requests. is there.

[0005]

SUMMARY OF THE INVENTION An optical disk device according to the first aspect of the present invention comprises at least one disk rotated by a spindle motor, a head for writing / reading data in the vicinity of the surface of the disk, and a head. In an optical disk device having an actuator mechanism for moving and positioning the actuator to a predetermined track position, a head controller for controlling the operation of the actuator mechanism by a servo signal, and an interface for giving a seek command to the head controller and exchanging data with a host device. , A head, a head controller, and a plurality of interfaces, which are individually controlled.

The optical disk device of the second aspect of the present invention is the optical disk device of the first aspect of the present invention, in which a memory for storing access requests coming from each of the plurality of interfaces and a plurality of access requests for temporary storage in the memory are stored. It has an arbitrator that sequentially assigns access requests to the head controllers that have completed processing in order of priority.

In the optical disc device of the third aspect of the present invention, in the optical disc device of the second aspect of the invention, when access requests are successively made from a higher priority device, the lower priority device receives an access request. On the other hand, it has a function of giving access right periodically.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a schematic diagram of an optical disk device according to an embodiment of the present invention.

First, for simplification, the case where the number of heads is two will be described.

In FIG. 1, a head 2 is a first write / read head, a head 3 is a second write / read head, and a disk 1 is an optical disk medium, which rotates in a rotation direction 4. There is. The head 2 is controlled by a head controller 10 so that a movable range 6 around a fulcrum 8
Move to and write / read data. Similarly, the head 3 also moves in the movable range 5 around the fulcrum 7 under the control of the head controller 9 to write / read data. Further, in this case, since the head controllers 9 and 10 are separate, the movement of the heads 3 and 2 can be performed without restricting each other.

First, writing (reading) from only the terminal 13
When the command is issued, the interface 11 halves the data area to be written (read) to the head controller 9 and the head controller 10 (for example, the head controller 9 is an odd track, the head controller 10 is an even track, etc.). Instruct to write (read). This doubles the write (read) speed.

Next, when a read command is issued from both the terminal 13 and the terminal 14, the interface 11 and the interface 12 respectively provide the head controller 9 and the head controller 10 with an area to be read and operate individually. .. In the conventional device, in this case, it was necessary to wait until one of the processes was completed, but in the optical disc device of the present embodiment, it is not necessary to wait for both terminals 13 and 14 in this case.

Finally, when a read command is issued from the terminal 13 and a write command is issued from the terminal 14, only when the same file is accessed, the process on the interface side which has received the command is prioritized and the other one is given priority. I'll keep you waiting. At this time, for writing / reading, as described above, both the head controller 9 and the head controller 10 are used to complete the processing at double speed. That is, the total processing is also twice as fast, and the latest data at that time can be written / read without any problem.

FIG. 2 is a diagram showing a method for performing priority processing of each interface port of this embodiment, and FIG. 3 is a partial explanatory diagram for explaining the operation of the arbitrator and memory of FIG.

In FIG. 2, the arbitrator 15 temporarily stores the access requests coming from the respective interfaces 11 and 12 in the memory 16, and sequentially issues the access requests to the head controller 9 or 10 that has completed the processing in order of priority. Allocate. In this case, if access requests are successively made from terminals having high priority, access from terminals having low priority will not be executed forever.

Therefore, in order to prevent access by the head controller from concentrating only on terminals having a high priority and preventing access by terminals having a low priority, access rights should sometimes be given to those having a low priority. Is.

For example, as shown in FIG.
The individual access request queues 17 to 24 are created, and the queues 17 to 24 are checked each time one unit of access is completed. The arbitrator 15 determines the contents of the queue containing the data, which has not been accessed for a while, by the head controller 9,
Try to tell 10. Then, in order to detect that the access is not performed for a while, the number of counters that are decremented for each access is set by the number of queues, and a numerical value according to the priority is preset.

In FIG. 3, there is a set of eight queues 17 to 24, two head controllers 9 and 10 and two heads 2 and 3, and eight counters 25 to 32 are provided.
As an example of the preset value of the counter, 1, 1, 1, 1,
It is set to 1,1,1,1. When the access to the terminal with the highest priority ends, the counter value is decremented, and when it reaches 0, no access command is passed to the head controller until the next access check. When access requests are made to all ports, the terminal having the lowest priority can access at least once out of 256 times. By assigning the priority to each I / O port, there is a possibility that some unused ports may appear, but in that case, the counter is skipped and the possibility of access is increased. When there is no access request in the queue, the counter value should always be 0.

Taking the fact that there are a plurality of heads into consideration, the description will be repeated with reference to FIG. 3 as an example. Port 101, port 102 ... Port 108 are arranged in descending order of priority and are connected to port 102, port 105 and port 108, respectively. When there are consecutive access requests from the terminal, the head controller 9 always responds to the requests from the port 102, and the head controller 10 responds to the requests from the ports 105 and 108 at an access ratio of 2: 1. Corresponds. That is, for access from a terminal having a high priority, one of a plurality of heads is dedicated, and when there is one remaining unused head, the remaining head is used in a time division manner.

By the above priority control, an access from a terminal with a low data access amount and a low priority can be secured once for an access with a constant access amount, so that the access condition is not occupied by a specific terminal.

[0022]

As described above, according to the present invention, the optical disk device has a plurality of individually controllable write / read heads, head controllers, and interfaces, and the heads are controlled individually. If less than the number of data access commands are issued, multiple head controllers can be used for one interface to increase the speed multiple times, and data access requests equal to or greater than the number of heads can be issued. When issued, the heads are assigned in the order of issue or priority, and multiple heads that operate simultaneously and the head controller and interface connected to it are operated at maximum, and as a result, the speed can be increased by the number of heads. The effect is that the waiting time for a large number of access requests can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a method for performing priority processing of each interface port of the present embodiment.

FIG. 3 is a partial explanatory diagram for explaining the operation of the arbitrator and memory of FIG.

[Explanation of symbols]

 1 disk 2,3 head 4 disk rotation direction 5,6 head movable range 7,8 head fulcrum 9,10 head controller 11,12 interface 13,14 terminal 15 arbitrator 16 memory 17-24 queue 25-32 counter 101 ~ 108 interface

Claims (3)

[Claims] 1. An at least one optical disk medium rotated by a spindle motor, an optical head for writing / reading data in proximity to the surface of the optical disk medium, and the optical head moved to a predetermined track position. In the optical disk device having an actuator mechanism for positioning, a head controller for controlling the operation of the actuator mechanism by a servo signal, and an interface for giving a seek command to the head controller and exchanging data with a host device, the optical head and the An optical disk device comprising a plurality of head controllers and a plurality of the interfaces, each of which is individually controlled. 2. The optical disk device according to claim 1, wherein
A memory for storing access requests coming from each of the plurality of interfaces, and an arbitrator for temporarily storing the plurality of access requests in the memory and sequentially allocating the access requests to the head controller that has finished processing. An optical disk device comprising: 3. The optical disk device according to claim 2,
An optical disk device having a function of periodically granting an access right to an access request from a higher priority device having a lower priority when successive access requests are made from a higher priority device.