JPS59218672A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To omit the waiting time and to improve the date processing speed by controlling a driving motor for revolution of magnetic disk through a revolution synchronizing circuit which indicates whether the revolving state of the magnetic disk is fast or slow with a revolution synchronizing signal and the signal which detects a specific sector of the disk. CONSTITUTION:If a sector counter 25 counts ''0'' when the revolution synchronizing signal is delivered from a revolution synchronizing signal generating part 27 provided to an external controller, a revolution synchronizing circuit 26 controls a motor driving power amplifier 23 so that a spindle motor 21 revolves by inertia. Thus the rotational frequency of the motor 21 is slightly reduced, and therefore the counter 25 counts 127, for example, when the next revolution synchronizing signal is delivered. Then the circuit 26 controls the amplifier 23 so as to accelerate the motor 21. The counter 25 counts ''0'', for example, when the next revolution signal is delivered. Thus the acceleration control is discontinued, and the motor 21 is revolved again by inertia.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a magnetic disk device, and in particular, when a plurality of magnetic disk devices are connected to a controller, The present invention relates to a magnetic disk drive that is controlled to operate synchronously so that the times at which servo heads pass an index are the same.

[Prior art and problems]

In a conventional data processing apparatus using magnetic disk drives, a plurality of magnetic disk drives 2, 3, . . . 4 are connected to a controller 1, as shown in FIG. In this case, each magnetic disk device 2, 3...

Each has a control configuration as shown in FIG.

That is, a plurality of magnetic disks 6 attached to a spindle 5 are rotated by a spindle motor 7. The rotation of this spindle motor 7 is as follows.

It is controlled by a motor driving power amplifier 9, and its rotational state is detected by a rotation detector 8.

This rotation detector 8 outputs pulses synchronized with the rotation of the spindle motor 7. This is then sent to the first flip-flop (hereinafter referred to as 11FF) 10, thus N
A signal is output from tIFFIO once per round.

Additionally, an output pulse signal from an oscillator 11, such as a crystal oscillator, is transmitted to a counter 12.

Here, the counter 12 is configured to produce an output when it counts M, for example. If the output pulse signal of the oscillator 11 is counted M-1 in one cycle when the spindle motor 7 is rotating at a normal speed, then
When the spindle motor 7 rotates at a normal speed or at a high speed, the counter 12
By the time 1lFF 10 counts, a reset signal based on the above-mentioned pulse signal once per cycle is output, so the counter 12 is reset and no output is generated.

However, if the rotation of the spindle motor 7 is slow, the counter 12 will count the output pulse signal of the oscillator 11 by M or more, so when this M is counted, 2
2FF13 produces an output.

Then, when the above-mentioned one-round pulse signal is applied from 11FF10 to this 22FF13, an L level output signal indicating that the rotation of the spindle motor 7 is slower than normal is applied from the 12FF13 to the motor drive power amplifier 9. . As a result, the motor drive power amplifier 9 controls the supply of the spindle motor 7 so as to increase the rotation speed of the spindle motor 7, and thus the rotation speed of the spindle motor 7 increases.

When the rotational speed of the spindle motor 7 becomes normal or above normal, the counter 12 does not produce an output as described above, and the second FF 13 outputs an H level output signal to the motor driving power amplifier 9. At this time, the motor drive power amplifier 9 controls the spindle motor 7 to inertially drive it. In this way, the magnetic disk 6 is controlled to rotate at a constant speed.

By the way, the magnetic disk 6 is as shown in FIG.

For example, the data is divided into 128 sectors from θ to 127, and when the index ID between sectors 0 and 127 passes through a servo head (not shown), an index pulse is output and the sectors necessary for accessing the magnetic disk are output. Indicate the reference position. The magnetic disk can be accessed continuously for one rotation of the rack.

However, in the conventional magnetic disk device, as shown in Fig. A11, a plurality of magnetic disk devices 2, 3 . . . 4 is used, the respective magnetic disk drives are not synchronized, so the output times of the index pulses do not match.

Therefore, for example, when accessing the magnetic disk device 2 and then accessing the magnetic disk device 3.

For example, as shown in FIG. 4, one round of the track is accessed based on the generation of the index pulse IAl output from the magnetic disk device 2.

When accessing the magnetic disk device 3 subsequently.

As shown in FIG. 4(C), access cannot be made until after the index pulse IB is generated from the magnetic disk drive 3. Therefore, as shown in FIG. 4(E).

Time TO between index pulse IAg and IB
However, there is a problem that the data processing is slow due to the need for waiting time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk device that can eliminate the above-mentioned waiting time that exists when accessing a plurality of magnetic disk devices consecutively, thereby improving data processing speed. .

[Structure of the invention]

In order to achieve this object, a magnetic disk drive according to the present invention includes a magnetic disk rotation drive motor that drives a magnetic disk and a control circuit that controls this magnetic disk rotation drive motor. a rotation synchronization signal generation unit that outputs a rotation synchronization signal generator, a sector detection signal output means that outputs a signal for detecting a specific sector of the magnetic disk, and a rotation synchronization circuit that indicates whether the rotation state of the Fiji disk device is fast or slow; The present invention is characterized in that a control signal corresponding to the rotational state of the magnetic disk device is output from the rotation synchronization circuit to a control circuit that controls a motor for driving the rotation of the magnetic disk.

[Embodiments of the invention]

An embodiment of the present invention will be explained based on FIGS. A'5 to A'8.

FIG. 5 is a block diagram of an embodiment of the present invention, FIG. 6 is a schematic explanatory diagram of its operation, FIG. A'7 is a detailed diagram of the rotation synchronization circuit, and FIG. 8 is a detailed explanatory diagram of its operation.

The outline of the present invention will be explained with reference to FIGS. 5 and 6 and FIG. 3.

Now, when the rotation synchronization signal RO8YNP generated from the rotation synchronization signal generator 27 in FIG. 5 is output, if the servo head 20 corresponds to sector 0.127 of the magnetic disk in FIG. The rotations of the spindle motors 21 that drive the disks are synchronized.

However, if the spindle motor rotates slowly, a rotation synchronization signal will be output when the servo head is located at sectors 126 or 127, and if the spindle motor rotates quickly, sectors O or 1 will be located at the servo head. When this happens, a rotation synchronization signal will be output. Therefore, as shown in Fig. 3, when the rotation synchronization signal is output around the sectors 63 and 64, the count value of the sector counter 25 in the servo circuit/control circuit 24 (this count value is the count value of the servo head 20). In the part where the sector position (indicating the sector position) is from O to 63, the spindle motor 21 is assumed to be rotating fast, and the motor drive power amplifier 23 is controlled to decelerate it (in this case, inertia drive), and conversely, the rotation is synchronized. When the signal is output, the motor driving power amplifier 23 is controlled to accelerate the rotation of the spindle motor 21, assuming that the rotation of the spindle motor 21 is slow in a portion where the count value of the sector counter 25 is 64 to 127.

That is, as shown in FIG. 6, if the sector counter 25 in FIG. 5 is counting O when the rotation synchronization signal generator 27 provided in the external controller outputs the rotation synchronization signal, then the state shown in FIG. The rotation synchronization circuit 26 controls the motor drive power amplifier 23 so that the spindle motor 21 rotates inertia. As a result, the spindle motor 21
Since the rotation of the spindle motor 21 decreases a little, the sector counter 25 has already counted, for example, 127 when the primary rotation synchronization signal is output as shown in FIG. The motor driving power amplifier 23 is controlled so as to accelerate the motor. Then, when the rotation synchronization signal is output next time, the sector counter 25 is counting, for example, zero, so this acceleration control is stopped and the spindle motor 21 is inertially rotated again.

Since the rotation of the magnetic disk device can be controlled in this way, it is possible to control the index ID so that it passes through the servo head 20 when the one-rotation synchronization signal is output.

The details of the rotation synchronization circuit 26 will be explained using an off-line diagram.

As shown in the off-line diagram, the 9-rotation synchronous circuit 26 is a Noah Geh) 3
0,31. Nand gate 32. 33, 34° latch 35. Nando Gate 36.37. Noah Ge) 38
．． Latch 39. It is equipped with a NAND gate 40, 41 degree changeover switch 42, etc. The changeover switch 42 is switched to the contact side when the magnetic disk drive is synchronously controlled according to the present invention, and is switched to the contact α side when the conventional asynchronous control shown in FIG. 2 is performed.

The changeover switch 42 is now set to the contact side.

Incidentally, in the off-line diagram, the servo head 20 detects sectors of the magnetic disk 6.

This causes the sector counter 25 to count. When the sector is divided into 0 to 127, the sector counter 25 generates a 7-bit output signal as shown in Figure ``)V7.The output of the lowest 3 bits 1°2.4 is a NOR gate. 30 and the primary 3 bits 8, 16, 32
The output of is input to NOR gate 31. The output of the most significant bit 64 is then input to the NAND gate 32. The other two input terminals of this NAND gate 32 are
A level signal of +5V is input. Therefore, NAND gate 32 outputs "1" when the most significant bit 64 of sector counter 25 outputs "0".

The output of the most significant bit 64 is also transmitted to the latch 35. Therefore, when the sector counter 25 is counting 64 or more, the most significant bit 64 reads "
1" is output.

At this time, when a rotation synchronization signal is inputted to the clock terminal of the latch 35 from the rotation synchronization signal generating section 27 provided in the controller, its Q terminal outputs "0", and the spindle motor 21 is accelerated. In other words, the "0" output from this Q terminal causes the NAND gate 36 to rl
Output J. Note that "1" is applied to the other terminal TX of 6〉F.'7'-) 36. At this time, as described above, the changeover switch 42 is switched to the contact side, and the +5V H level signal rlr is applied to one input terminal of the NAND gate 37, so that the output from the NAND gate 36 is The NAND gate 37 is r
Output OJ. By the way, the NAND gate 40 outputs "1" because one of its input terminals is grounded by the changeover switch 42, but the NAND gate 41 outputs "1" due to the "0" output of the NAND gate 37. Output. This is transmitted to the motor drive power amplifier 23 shown in FIG. 5, and thereby the spindle motor 21 is accelerated.

Conversely, when the rotation synchronization signal from the outside is input to the latch 35, if the sector counter 25 has not counted up to 64, the most significant bit 64 is rOJ, and at this time the Q terminal of the latch 35 is Outputs “1” and performs deceleration control for spindle motor 2 (i.e. Q
The rIJ output from the terminal causes the NAND gate 36 to become rO
J, NAND gate 37 outputs rlJ, and NAND gate 41 now outputs "0". As a result, the motor drive power amplifier 23 is connected to the spindle motor 2.
The power supply to the spindle motor 21 is stopped and the spindle motor 21 is controlled for inertial rotation.

The operation based on this control will be explained in detail with reference to FIG. O8
Figure P) is the rotation synchronization signal transmitted from the external rotation synchronization signal generator 2!7, and (B) is the index pulse, which is output when the index ID is located between sectors O and 127 of the magnetic disk. (C) is the output of the most significant bit 64 of the sector counter 25, and (C) is the acceleration control of the spindle motor 21.

The Q terminal output of the latch 35 that instructs deceleration control, 0, is an explanatory diagram of the acceleration and deceleration states of the spindle motor 21.

(f) is a synchronous operation or asynchronous operation instruction.

Now, when the first rotation synchronization signal R1 is input to the latch 35 during the synchronization period shown in FIG. Controls deceleration by inertia operation. As a result, the spindle motor 21 becomes 1 year and 8 years) (
The next rotation synchronization signal R1 of the one that is decelerated as shown in e)
This deceleration control is continued when is applied or when the sector is less than 64. Note that the index pulse is output between sectors O and 127. Then, when the third rotation synchronization signal Rs is applied, the sector counter starts from 64 to
Since it is between 127 and 127, acceleration control is performed this time. By repeating this process, the outputs of the one-rotation synchronization signal and the index pulse can be controlled to be approximately equal, that is, to a synchronized state.

Moreover, the dotted line shown in FIG. 8(c) shows the case where the asynchronous period continues.

Note that in the off-diagram, the NAND gate 33 is connected to the sector
When the counter 25 is 0, that is, when all bits are 0, it outputs 0, and outputs one pulse per revolution. This causes the NAND gate 34 to output "1". A signal when the sector 127 is detected is transmitted to the terminal T127 of the NOR gate 38, and a well-known negative pulse for hair removal is applied to the terminal TY. Therefore, the NOR gate 38 outputs the period rOJ during which the positions of sector 0 and sector 127 are being detected. Furthermore, since a rotation synchronization signal from the outside is applied to the clock terminal CK of the latch 39, if the rotation synchronization signal is applied when the index ID is located between sector O and sector 127, the latch 39 ``1'' is output from the φ terminal of , indicating that it is in a synchronized state.

Further, when the changeover switch 42 is switched to the contact α side, the other terminal of the NAND gate 40 is connected.

Since the output of 12FF13 in FIG. 2 is applied.

The output of this 12FF13 is outputted from a NAND gate 41 via a NAND gate 40, and control corresponding thereto, that is, conventional asynchronous control, is performed.

〔Effect of the invention〕

According to the present invention, 1, for example, the controller 1 outputs a rotation synchronization signal to each magnetic disk device 2, 3,...
This allows each magnetic disk device to be maintained in a synchronized state. And data processing, so this can be done prior to execution.

A plurality of magnetic disk drives can be accessed continuously without requiring waiting time as in the conventional case.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a connection state of a magnetic disk device. Fig. 2 is a conventional control circuit, Fig. 3 is an explanatory diagram of sectors of a magnetic disk, Fig. 4 is an explanatory diagram of a conventional asynchronous state, Fig. 5 is a configuration diagram of an embodiment of the present invention, and Fig. 6 is its outline. The operation explanatory diagram and the OFF diagram are detailed diagrams of the rotation synchronization circuit, and FIG. 8 is a detailed explanatory diagram of its operating state. In the figure, ■ is a controller, 2, 3, . . . 4 are magnetic disk devices, 5 is a spindle, and 6 is a magnetic disk. 7 is a spindle motor, 8 is a rotation detector, 9 is a power amplifier for driving the motor, 10 is 11FF, 11 is an oscillator,
12 is a counter, 13 is a second FF, 20 is a servo head, and 21 is a spindle motor. 22 is a rotation detector, 23 is a motor drive power amplifier,
24 is a servo circuit/control circuit, 25 is a sector/control circuit.
Counter 30.31 is Noah Gate. 32.33.34 is a NAND gate, 35 is a latch, 3
6.37 is Nando Gate, 38 is Noah Gate, 39
is lunch, 40.41 is Nando's game), and 42 is a changeover switch. Patent Applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Claims] A rotation synchronization signal generation unit that outputs a 9-rotation synchronization signal in a magnetic disk drive including a magnetic disk rotation drive motor that drives a magnetic disk and a control circuit that controls this magnetic disk rotation drive motor, and a specific sector of the magnetic disk. A sector detection signal output means that sends out a signal to detect the magnetic disk drive, and a rotation synchronization circuit that indicates whether the rotation state of the magnetic disk drive is fast or slow are provided, and a control signal corresponding to the rotation state of the magnetic disk drive is sent from the rotation synchronization circuit. A magnetic disk device characterized in that an output is output to a control circuit that controls a motor for driving magnetic disk rotation.