JPH0656691B2 - Disk device by multi-channel parallel transfer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of use) The present invention relates to a disk device using a multi-channel parallel transfer system, and more particularly to a technique for suppressing the influence of rotational deviation occurring between channels of a plurality of disks. Regarding the improvement of.

(Prior Art) Conventionally, in a disk device using a multi-channel parallel transfer system of this type, information written in a plurality of disks is read by each corresponding head, and each read signal is amplified by a head IC, For example, as shown in FIG. 4, it is sent to each reproducing circuit 1 (1 ₁ to 1 _N ), and in each reproducing circuit 1, the binarized data (PRDT ₁ to _N and clock (PR
After being converted into CK ₁ to _N ), it is sent to the controller of the host system (not shown) via each drive circuit 2 (2 ₁ to 2 _N ).

Then, the controller of the host system is provided with a measure to suppress the influence of the rotational deviation generated between the channels of the plurality of disks.

(Problems to be Solved by the Invention) However, when driving each drive circuit 2 by the multi-channel parallel transfer method as in the above-described conventional case, the drive clock cannot be made common due to the rotation deviation between the channels.

In this case, as the number of channels increases, the number of signal lines on the host system side also increases, and the interface specifications become complicated. Therefore, the controller is required to have a function capable of handling a plurality of clocks.

Therefore, the conventional disk device using the multi-channel parallel transfer system of this type has a problem that not only the entire system becomes large-scale, but also it is difficult to further increase the number of channels from the viewpoint of system reliability and the like. It was

The present invention has been made in view of such circumstances, and an object thereof is to provide a plurality of channels capable of transferring each binarized data corresponding to a read signal from each head to a host system according to a common drive clock. It is to provide a disk device by a parallel transfer method.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention reads the information respectively written on a plurality of disks from each corresponding head, and outputs each read signal to each disk. In a disk device for converting into binarized data and transferring to a host system by a multi-channel parallel transfer method, memory means for writing and reading each binarized data as a target, and for this memory means, for each channel Timing control means for controlling writing at the reproduced clock timing and reading control at the clock timing common to each channel, and read data from the memory means subjected to writing and reading control by the timing control means,
Data transfer driving means used as data to be transferred to the host system by a multi-channel parallel transfer method.

(Operation) With the configuration according to the present invention, since each binarized data corresponding to the read signal from each head is read in synchronization with the timing control of the timing control means in the memory means, each binarized data described above. Will be transferred from the data transfer driving means to the host system according to a common clock.

Therefore, on the host system side, the controller can receive the binarized data in accordance with a single clock and can use the single clock as a basic clock at the time of reading.

(Embodiment) FIG. 1 is a block diagram showing a circuit configuration of essential parts of a disk device by a multi-channel parallel transfer system of an embodiment to which the present invention is applied.

In the disk device of this embodiment, since the read signal from each head is converted into binary data and transferred to the host system by the multiple channel parallel transfer method, the reproducing circuit 1 (1
₁ to 1 _N ) and the drive circuit 2 in correspondence with each reproduction circuit 1 for each channel, first-in first-out (FIFO) buffer memory 3
(3 _{1 to} 3 _N ) and the selector 4 (4 ₁ to 4 _N ) are provided, and the timing control unit 5 is provided to control the timing of these.

The timing control unit 5 includes an index / sector signal indicating the rotation ₁ generated from the rotation control unit 6 and each reproduction circuit 1
Reproduction clock (PRCK specific reproduction circuit 1 _N of
N), the write / read period for each buffer memory 3 is determined. As a result, a function as a timing control unit that controls writing to each buffer memory 3 at a clock timing reproduced for each channel and controls reading at a clock timing common to each channel, and a start of data reading in each buffer memory 3 are performed. It has a function as a delay unit that executes a process of delaying a preset time from the start of writing.

Further, the timing control unit 5 uses the index /
Based on the sector signal and the reproduction clock (PRCKN) of the specific reproduction circuit 1 _N , predetermined data for the time required for stabilizing each reproduction circuit 1 and the rotation deviation time between channels are added. It also has a function as an instruction means for adding an instruction to output 1 to each 1-lector 4.

A timing chart of each signal output from the timing controller 5 is shown in FIG.

In FIG. 2, S ₀ is a signal indicating the start of a sector. When the sector start signal S ₀ is applied from the rotation control unit 6 to the timing control unit 5, the timing control unit 5 causes the counter of each buffer memory 3 to count. After clearing (S1), writing (S2) and reading (S3) are instructed.

Therefore, the binarized data (PR) reproduced by each reproduction circuit 1
A clock (PRCK) in which DT ₁ to _N are reproduced at the same time.
₁ to _N ) is written in each buffer memory 3 and the reproduction clock (PRCK) of the specific reproduction circuit 1 _N is written.
N) is used as a common clock and is read from each buffer memory 3.

The read timing of each buffer memory 3 is delayed by the period A in FIG. 2 so that the data is not interrupted even if the rotation shift occurs between the channels.

On the other hand, each selector 4, which receives the binarized data read from each buffer memory 3, responds to the instruction (S ₄ ) from the above-mentioned instructing means of the timing control section 5, and outputs the second
In the period B in the figure, that is, the time required for stabilizing each reproducing circuit 1 plus the rotational deviation time between channels, after outputting predetermined data to the drive circuit 2, the binary value from each buffer memory 3 is output. It functions as a switching unit that performs switching to send the converted data to the drive circuit 2.

Therefore, the instruction means of the timing control unit 5 and each selector 4
In combination with the above, the cueing of the binarized data sent from each buffer memory 3 to the drive circuit 2 is guaranteed.

As described above, the timing control unit 5 controls the respective buffer memories 3 and the respective selectors 4, so that the binarized data obtained by the respective reproducing circuits 1 is converted into the driving circuit 2.
From a host system controller (not shown) according to a common clock.

From the above, in the disk device according to the embodiment of the present invention, the controller on the host system side can receive the binary data of each reproducing circuit 1 according to the single clock and read the single clock. It becomes possible to use it as a basic clock of time.

Along with this, it becomes easy to simplify the use of the interface, and since the number of signal lines on the host system side can be reduced, it becomes easy to distribute the cables connecting the respective parts in the system. Therefore, even if the number of channels is significantly increased as compared with the conventional one, not only can the entire system be controlled in a large scale, but also the reliability in data transfer can be prevented from deteriorating.

In the embodiment of the present invention described above, as shown in the top view of FIG. 3 (A) and the partially cutaway side view of FIG. 3 (B),
A plurality of disks 8 are mounted at regular intervals on a disk rotating shaft 7 coupled to a spindle motor (not shown), while heads 9 for reading / writing information from / to the disks 8 are mounted on head arms 10. And constitutes the disc portion. Then, each head 9 in this disk portion
Read signal from the head IC (not shown),
It outputs to each reproduction circuit 1 in FIG.

[Effects of the Invention] As described above, the disk device according to the multiple channel parallel transfer system of the present invention temporarily stores the binarized data in the memory means in accordance with the clock timing reproduced for each channel, while it is shared by the memory means. Since the data is read at the clock and output to the host system, the host system can read the data only by receiving the binarized data according to the common clock.

Therefore, according to the present invention, the system configuration on the host system side can be simplified, and the reliability of data transfer can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of essential parts of a disk device of an embodiment to which the present invention is applied, FIG. 2 is a timing chart of each signal output from a timing control unit, and FIG.
FIG. 4 is a block diagram showing an outline of a disk unit in a disk device, and FIG. 4 is a block diagram showing a functional structure of a conventional multiple channel parallel transfer system. DESCRIPTION OF SYMBOLS 1 ... Reproducing circuit, 2 ... Driving circuit 3 ... First-in first-out buffer memory, 4 ... Selector 5 ... Timing control part, 6 ... Rotation control part

Claims (3)

[Claims] 1. A disk apparatus for reading information written on a plurality of disks from corresponding heads, converting each read signal into binary data, and transferring the binary data to a host system by a multi-channel parallel transfer method. A memory means for writing and reading each of the binarized data, and a timing for performing write control on the memory means at a clock timing reproduced for each channel and a read control at a clock timing common to each channel. Control means, and read data from the memory means which is controlled to write and read by the timing control means,
And a data transfer driving means used as data to be transferred to the host system by a multi-channel parallel transfer system. 2. The plurality of channels according to claim 1, wherein the timing control means includes a delay means for executing a process of delaying a data read start in the memory means from a write start by a preset time. Disk device by parallel transfer method. 3. The timing control means outputs, every time a data read request is received, predetermined data for a time obtained by adding a time required for stabilizing each of the reproducing circuits and a rotation deviation time between channels. An instruction means for adding an instruction to the effect to the data transfer driving means, wherein the data transfer driving means outputs predetermined data in response to the instruction from the instructing means and then reads the read data from the memory means. 2. The disk device according to the multi-channel parallel transfer system according to claim 1, further comprising switching means for receiving the data.