JPS63298861A - Disk device - Google Patents

Abstract

PURPOSE:To contrive the reduction of the degree of monopolized controller side by the device due to interval time of revolution by controlling the disk drive synchronously with a reference index signal and sending a ready signal to the controller side. CONSTITUTION:An actuator is moved after awaiting a motor reaching a set speed range to apply the initial seek and on-track. Then an internal index is generated from a servo signal fetched from a magnetic disk by a servo head 17. In switching a changeover switch 14 to the position B, speed difference and phase difference are detected by a speed difference/phase difference detector 8 based on the internal index signal extracted from the disk to control the motor 11. When the phase difference reaches a range in this state, a phase difference ready detector 15 is operated and the internal ready signal is generated, and after settling of the motor 11, an external ready enable signal comes true. Thus, time loss is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a disk device, and is particularly suitable for a magnetic disk device.

(Prior Art) Magnetic disk drives are generally used by configuring a system as shown in FIG. That is, a plurality of magnetic disk devices 400, 410 . ...is the disk controller 20
The CPU 100 is configured to be driven by the host CPU 100 via the CPU 100. and disk controller 200
and magnetic disk devices 400, 410. The interface 300 between ... is the American standard ESDI,
Shugart's 5T-506,
8MD.

5C8I etc. are usually used.

When the conventional interface 300 is used, the controller 200 has a plurality of magnetic disk devices 400, 410 . ...can be connected.

The output section of each magnetic disk device is provided with a NAND gate that receives an internal index signal and a select signal as inputs, and when the controller 200 selects one of the magnetic disk devices, the index signal 500 is selected. The data is sent from the magnetic disk device to the controller 200 and indicates the rotational position when reading or writing the disk.

When the controller 200 reads or writes to a disk of a magnetic disk device, it selects the drive of the desired disk, observes an internal index signal, and waits for the desired sector to rotate. There is a need to do.

In conventional magnetic disk drives, this rotational waiting time is within one revolution, but it is undefined and the controller needs to constantly monitor this waiting time. There is a problem that

(Problem to be Solved by the Invention) In this way, in conventional magnetic disk devices, when the controller selects a drive in the magnetic disk device, the controller must directly monitor the rotational wait time; There is a problem in that the waiting time cannot be used for other processing.

The present invention has been made in order to eliminate such conventional drawbacks, and it is an object of the present invention to provide a magnetic disk device that can reduce the degree to which the controller side is monopolized by the magnetic disk device for waiting for rotation. purpose.

[Structure of the invention]

(Means for Solving the Problems) A disk device according to the present invention compares a reference index signal sent from the outside via an interface bus with an internal index signal output according to the rotational state of the disk, Speed difference/phase difference detecting speed difference and phase difference
Equipped with a phase difference detector and a phase difference ready detector that outputs a ready signal when the phase difference falls within a predetermined range, controls disk rotation in synchronization with the reference index signal, and sends a ready signal to the controller side. It is characterized by

(Function) In the disk device of the present invention, when the rotation of the disk reaches a predetermined rotational state according to a reference index signal given from the outside, a ready signal is transmitted from the position detector to the controller. be done.

Therefore, there is no need to keep the controller fully connected to the disk device until the ready signal is received.

(Example) An example of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing the configuration of a magnetic disk device according to an embodiment of the present invention. In this embodiment, a servo-type index raising system is adopted. The controller 200 outputs a basic index signal that serves as a basic clock for controlling the rotation of the magnetic disk in the magnetic disk device 400.

For this reason, the controller 200 includes an oscillator 1 such as a crystal for generating a clock signal, and a frequency divider for dividing the frequency of the clock signal obtained by this oscillator to create a reference index that matches the rotation period of the spindle. 2, a pulse shaper 3 for forming a pulse signal having a constant pulse width based on the output from the frequency divider 2, and a driver 4 for amplifying the pulse signal. .

The output from the controller 200 is transmitted from the driver 4 as a reference index signal 5 to the magnetic disk device 400 via the bus. The reference index signal 5 is taken into the magnetic disk device 400 via the receiver 7. Further, a terminator 6 is provided at the interface section for connection between the controller 200 and the magnetic disk device 400.

The reference index signal is compared with an index indicating the rotational speed of the motor by a speed difference/phase difference detector 8, a speed difference and a phase difference are detected, and this is converted into a voltage or the like and output to a filter/amplifier 9. The filter amplifier 9 includes an integrator and a filter, passes a necessary frequency band, amplifies it, and outputs it to the driver 10.

The driver 10 supplies a predetermined current to the DC motor 11 in response to an input and a rectified signal 12 corresponding to the rotational position of the DC motor 11 to drive it.

Note that a motor 11 rotates the spindle of the disk device.
is a DC servo controlled motor. The rectified signal 12 is generated by detecting the rotational position of the motor with a magnetic sensor, etc.
This rectified signal 12 is obtained as several pulses, about four per rotation, and is fed back to the driver 10 for manual input. This rectified signal is frequency-divided by a pseudo index generator 13 so that it becomes a signal of one period per rotation of the motor 11, and a pseudo index signal is obtained as a signal indicating the rotational speed and a temporary reference position.

The pseudo index signal generated from the pseudo index generator 13 is input to the speed signal changeover switch 14, and is mutually switched with an internal index signal, which will be described later, obtained from the servo data, and output to the speed difference/phase difference detector 8. . In addition, when the changeover switch 14 in the figure is in the position A, the signal from the pseudo index generator 13 is in the position B.
, internal index signals from the servo heads are selected and input to the detector 8, respectively. The output of the detector 8 is also output to a phase difference ready detector 15, and if the phase difference between the reference index signal and the internal index signal is within a predetermined range, this phase difference ready detector 15 detects the ready signal. Output to gate circuit 16.

The gate circuit 16 outputs a ready signal onto the interface when the ready enable signal is on.

On the other hand, the disk is being accessed by the servo head 17, and the servo data taken out from the disk by the servo head 17 is amplified by the amplifier filter 18, noise etc. are removed, and then inputted to the servo clock bit separation circuit 19.

The servo clock bit separation circuit 19 separates the clock information, converts it into a binary value, and supplies it to the servo clock generation circuit 20 and the index pulse generation circuit 21.

The servo clock generation circuit 20 creates a continuous clock from servo clock information and supplies it to the index pulse generation circuit 21. Index pulse generation circuit 21
detects the index position from the servo clock and the servo clock bit pulse and outputs it to the speed signal changeover switch 14 as one internal inch signal per one revolution of the disk.

The seek control, ready enable, switch on/off, motor on/off, etc. of the magnetic disk device 400 are all performed by a sequence control circuit 22 comprising a microprocessor or the like.

Next, the operation of the circuit shown in FIG. 1 will be explained. Figure 2 is the first
3 is a flowchart for explaining the operation of the circuit shown in the figure. The sequence shown in FIG. 2 is executed according to the sequence control circuit 22.

First, the ready enable is set to false in step S1) and the selector switch 14 is turned to the A side in step S2), making ready for the outside virtual. Then, the motor 11 is turned on (step S3). As a result, the pseudo index is output in accordance with the rotation of the motor, and is compared with the reference index by the speed difference phase detector 8, and waits until the motor reaches the set rotation speed range (step S4).

Next, the actuator is moved to perform the most desired seek and to perform on-track (step S5).

Here, internal inches are generated from the servo signal taken in from the magnetic disk by the servo head 17.

Then, the changeover switch 14 is switched to the B side (step S6). Then, a speed difference and a phase difference are detected by the speed difference/phase difference detector 8 based on the internal index signal taken out from the disk, and the detection results are fed back to control the motor 11. Wait in this state,
When the phase difference reaches a certain range, the phase difference ready detector 15
operates and an internal ready signal is generated (step S7).

After settling of the motor 11, the ready enable signal to the outside is set to true (step S8).

This makes it ready for the outside, allowing normal access such as reading and writing, and the spindle becomes synchronized with the base index.

Note that the second operation was for the servo index detection method, but if the internal index and the pseudo index have the same format, the circuit using the changeover switch 14 is not necessary, and the pseudo index can be detected by speed detection. It can be used as a signal.

Note that in the controller 200 shown in FIG. 1, by checking the contents of the counter of the frequency divider 2, it is possible to know the timing from the index and perform the operation.

Note that the reference index signal generated from the external controller in this manner can be supplied to a plurality of magnetic disks, and the rotations of the spindles of these plurality of magnetic disks are synchronized. At this time, if a special format is used in which the addresses alternate for each cylinder of both devices, it is possible to reduce the waiting time by performing a seek operation on one side while the other side is reading. It becomes possible.

In the embodiments described above, a magnetic disk device is described, but the present invention can be applied to devices using rotating disks such as optical disk devices and magneto-optical disk devices.

〔Effect of the invention〕

As described above in detail based on the embodiments, in the present invention, the ready signal is sent to the magnetic disk device when the rotation of the disk becomes stable and the access becomes hJ function in comparison with the reference index signal given from the outside. Since the controller is configured to output data from the side to the controller side, the controller does not have to select a disk device and directly view the rotation waiting state, thereby eliminating time loss through the interface.

Furthermore, the rotation waiting time can be grasped within the controller, and the controller can utilize the rotation waiting time for other processing.

Furthermore, if a common reference index signal is supplied to a plurality of devices and a format is used in which addresses are alternated for each cylinder, it is possible to reduce the waiting time due to seek.

In addition, in the embodiment of the present invention, the interface portion is only slightly changed, so that it can be added as an option to a conventional device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the device shown in FIG. 1, and FIG. 3 is a conventional magnetic disk device. FIG. 4 is a configuration diagram of a conventional magnetic disk device. 200...Disk controller, 400...Magnetic disk device, 5...Reference index signal, 8...
・Speed difference/phase difference detector, 11...DC motor, 13
... Pseudo index generator, 14... Speed signal changeover switch, 15... Phase difference ready detector, 16.
...Gate circuit, 17...Servo head, 21...
Index pulse generation circuit, 22...Sequence control circuit. Applicant's agent Mr. Sato Figure 3

Claims (1)

[Claims] 1. A speed difference that detects a speed difference and a phase difference by comparing a reference index signal sent from the outside via an interface bus and an internal index signal output according to the rotational state of the disk. - Equipped with a phase difference detector and a phase difference ready detector that outputs a ready signal when the phase difference falls within a predetermined range, controls disk rotation in synchronization with the reference index signal, and sends the A disk device characterized by transmitting a ready signal. 2. The disk device according to claim 1, wherein the internal index signal is a pseudo index signal obtained by frequency-dividing a rotational speed detection signal of a motor that drives the disk. 3. Combining the internal index signal with a pseudo index signal obtained by dividing the rotational speed detection signal from the motor that drives the disk and an index position detection signal obtained by reading information on the disk by a servo head that accesses the disk. 2. The disk device according to claim 1, wherein the information is selectively obtained by switching. 4. The disk device according to claim 1, wherein the reference index signal is supplied to a plurality of disk devices, and the addressing of each of these disk devices is controlled to be alternate.