JPH0325339Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a spindle motor control circuit for a floppy disk drive device.

(B) Prior Art As disclosed in Japanese Patent Application Laid-Open No. 59-127267, in conventional floppy disk drive devices, the spindle motor rotates while a motor-on signal is output from an external device. It was structured like this.

5-inch and 8-inch floppy disk drive devices are equipped with a floppy disk controller.
Since it was equipped with a headload mechanism that controlled contact between the head and the media in response to the headload signal from the FDC, there was no problem even if the motor-on signal continued to be output while the power was on.

However, the 3.5-inch floppy disk drive device does not have a head load mechanism, so conventionally the motor-on signal was output only when the drive device was in use, and the rotation of the spindle motor was stopped when the drive device was not in use. This prevents wear and tear on the head and media.

(c) Problems to be solved by the invention In the conventional method of starting and stopping rotation each time the drive device is used, even when the drive device is used continuously, the spindle motor has to stop once. The problem was that it took a very long startup time of several hundred milliseconds for the rotation to stabilize again, which inevitably slowed down the system's processing speed.

(d) Means for solving the problem The present invention includes a detection circuit that inputs a head load signal and a motor-on signal output from a floppy disk controller, and outputs a detection signal when both signals are not generated. and a flip-flop that is set by the motor-on signal and reset by the detection signal, and the rotation of the spindle motor is controlled in accordance with the output of the flip-flop.

(E) Effect The head load signal is "H" when the motor on signal is
Since the signal maintains the "H" level for a certain period of time even after changing from the level to the "L" level, in the present invention, even after the motor-on signal changes to the "L" level, the motor-on signal is returned within a certain period of time. When the motor-on signal becomes "H" level, the flip-flop is set, and therefore the spindle motor continues to rotate.If the motor-on signal does not become "H" level again within a certain period of time, the flip-flop changes to "H" level of the head load signal. The spindle motor is reset in response to the change from the low level to the "L" level, and the spindle motor stops.

(F) Embodiment FIG. 1 is a block diagram showing an embodiment of a spindle motor control circuit according to the present invention, and FIG. 2 is a timing chart for explaining the operation.

In FIG. 1, 1 is a floppy disk drive device (hereinafter referred to as FDD) including a spindle motor 2 and a motor drive circuit 3; 4 is a floppy disk drive device (hereinafter referred to as FDD) that receives a request to use the FDD from the host;
It is a control device that outputs commands to the floppy disk controller 5 (hereinafter referred to as FDC), and the FDC 5 outputs a head load signal HLD in response to commands and exchanges various control signals and data. Natsute FDD1
control. Furthermore, when the operation of the FDD 1 is completed and a command execution end signal is input to the FDC 5, the FDC 5 notifies the control device 4 of the end of execution, and then stops outputting the head load signal HLD after a certain period of time has elapsed. The control device 4 stops outputting the motor-on signal MON in response to the notification of the end of execution from the FDC 5, and notifies the host of the end. Therefore, the headload signal
HLD holds the "H" level for a certain period T after the fall of the motor-on signal MON.

Furthermore, in Fig. 1, 6 is the motor on signal.
A NOR gate serves as a detection circuit that inputs MON and head load signal HLD and outputs detection signal G.
7 is set by the motor on signal MON,
This is a D flip-flop that is reset by the detection signal G of the NOR gate 6, and the motor drive circuit 3 rotates the spindle motor 2 when the Q output of the D flip-flop 7 is "H" and stops the rotation when it is "L". let

Furthermore, this D flip-flop 7 is a clear terminal.
Even if a “H” level signal is input to CLR,
If an "H" level signal is input to the preset terminal PR, the Q output becomes "H".

Next, the operation of this embodiment will be explained with reference to the timing chart of FIG.

When the FDD command from the host is input to the control device 4, the motor-on signal MON rises to the "H" level as shown in FIG. As shown in FIG. 2D, the level becomes "H" and the spindle motor 2 starts rotating. As described above, the FDC 5 sets the head load signal HLD to "H" level in response to a command from the control device 4, and when the execution of the command is completed, the FDC 5 sets the head load signal HLD to the "H" level in response to a command from the control device 4.
changes the motor-on signal MON from "H" to "L" level. However, since the head load signal HLD remains at the "H" level for a certain period T after the motor-on signal falls, the output of the NOR gate 6 remains at the "L" level, and the D flip-flop 7 is not reset. . Therefore, the rotation of the spindle motor 2 also continues.

If an FDD use request is input from the host again within this fixed period T, the motor-on MON is output and the output G of the NOR gate 6 goes to the "L" level, so the D flip-flop 7 is not reset and the Q output is maintains the "H" level. That is, as long as an FDD use request is input from the host within a certain period of time after the motor-on signal MON falls, the spindle motor 2 continues to rotate without stopping.

However, within a certain period T, the FDD from the host
If no usage request is input, the motor on signal
Since both MON and the head load signal HLD go to the "L" level, the D flip-flop 7 is reset, and therefore the Q output goes to the "L" level.
The spindle motor 2 stops rotating.

When a new FDD use request is input from the host, the D flip-flop 7 is set again by the motor-on signal MON, and the rotation of the spindle motor is restarted.

In this way, in the present invention, once the use of the floppy disk drive device is finished, if there is a next request for use within a certain period of time, the spindle motor continues to rotate, and even after a certain period of time, the spindle motor continues to rotate. If there is no rotation of the spindle motor, the rotation of the spindle motor will stop.

(g) Effects of the invention According to the invention, rotation can be continued in response to continuous use requests, and rotation can be continued in response to long periods of non-use using an extremely simple circuit without increasing the burden on the control device. It is possible to realize ideal spindle motor rotation control by stopping the rotation, which eliminates unnecessary waiting time when the motor starts to rotate.
The lifespan of heads and media can be extended without reducing system processing speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart for explaining the operation of the embodiment. Explanation of main drawing numbers, 1...FDD, 2...Spindle motor, 5...FDC, 6...NOR gate,
7...Flip flop.

Claims (1)

[Scope of utility model registration request] A detection circuit receives a head load signal and a motor on signal output from a floppy disk controller and outputs a detection signal when both signals are not generated, and a detection signal of the detection circuit that is set by the motor on signal. 1. A spindle motor control circuit for a floppy disk drive device, comprising a flip-flop reset by a flip-flop, and controlling rotation of a spindle motor according to an output of the flip-flop.