JP2609224B2 - Floppy disk driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Field of application in industry B Outline of the invention C Conventional technology D Problems to be solved by the invention E Means for solving the problems (FIGS. 1 and 2) F operation (FIGS. 1 and 2) Fig. G Embodiment (Figs. 1 to 4) H Effect of the invention A Industrial application field The present invention relates to a floppy disk driver,
When the power is turned on, the magnetic head is intended to be reliably positioned at a predetermined position.

SUMMARY OF THE INVENTION The present invention relates to a floppy disk driver for temporarily aligning a magnetic head to a predetermined position at power-on,
By allowing the magnetic head to move toward the area where the track is formed when the magnetic head is in the area where the track is not formed at power-on,
This is to ensure that the magnetic head can be positioned at a predetermined position regardless of the position of the magnetic head at power-on.

Conventionally, when the power is turned on, the floppy disk driver once positions the magnetic head on the outermost track (or the innermost track), determines a reference position, and then sets a predetermined operation mode. Then, the magnetic head is moved to a predetermined track.

The above-described operation for positioning the magnetic head on the outermost track at the time of power-on (hereinafter referred to as a recalibration operation) has conventionally been performed as follows. That is, a sensor is provided which sends out a detection signal which takes a logical "L" level when the magnetic head is on the outermost track and a logical "H" level when the magnetic head is on another track. When the detection signal from the sensor takes the logic "H", the magnetic head is moved outward until the detection signal from the sensor falls to the logic "L",
On the other hand, when the detection signal from the sensor at the time of power-on takes the logic "L", the magnetic head is located on the outermost track and the recalibration operation is immediately terminated.

D Problem to be Solved by the Invention By the way, the magnetic head may be displaced outside the outermost track at the time of power-on, for example, when an external shock is applied to the floppy disk driver. When in such a position, the sensor takes the same logic level as when in the outermost track.

Therefore, if the magnetic head is located outside the outermost track at power-on, that is, if there is a magnetic head in an area where no track is formed, the position is erroneously determined to be the outermost track position, and the subsequent operation is performed. It was done. For this reason, the track to be written and the track to be read are different from the predetermined track, which has led to data destruction and occurrence of errors in arithmetic operations.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a flip-flop capable of reliably performing a re-calibration operation even when the position of a magnetic head at the time of power-on is in a region where a track is not formed. It is intended to provide a disk driver.

E. Means for Solving the Problem In order to solve such a problem, in the present invention, the magnetic head 3 is positioned on the position reference track when the power is turned on, using the outermost or innermost track as the position reference track. In the floppy disk driver 1 to be aligned, when the magnetic head 3 is located in the first area including the position reference track bounded by the position reference track, the first
And a sensor 8 for outputting a second detection signal when the magnetic head 3 is located in the second area not including the position reference track, and the magnetic head 3 is positioned on the position reference track. In the operation mode, when it is determined based on the first detection signal from the sensor 8 that the magnetic head 3 is in the first area at the time of power-on, the magnetic head 3 is moved from the first area by one track to the second area. A command is issued to move from the first area to the second area by one track at a time until the magnetic head 3 enters the area, and the magnetic head 3 is moved from the first area to the second area based on the second detection signal from the sensor 8. When it is determined that the magnetic head 3 has entered the magnetic head 3 upon power-on, it generates first instruction signals STP and IDR for instructing movement in the reverse direction by one track, or based on a second detection signal from the sensor 8. Is in the second area When the determination is made, the second instruction signals STP, IDR instructing movement from the second area to the first area by one track at a time until the magnetic head 3 enters the first area based on the output of the sensor 8. And a motor drive circuit 12 for controlling the drive of the drive motor 5 of the magnetic head 3 based on the first display signal or the second instruction signal.

F action First area and second area bounded by position reference track
Is provided with a sensor 8 for sending out a different detection signal CTO when the magnetic head 3 is located in the region of the above.

Therefore, the magnetic head 3 can be moved to the position reference track by moving the magnetic head 3 and judging the position where the detection signal CTO is inverted.

Since the magnetic head 3 can be located in both the first area and the second area at the time of power-on, the magnetic head 3 can be moved in any direction even in the positioning mode. The track immediately after the inversion of the detection signal CTO is not the same between when the signal is moved from the first area to the second area and when the signal is moved from the second area to the first area. Is different from the position reference track by one track. Therefore, in this case, the magnetic head 3 is returned to the original direction by one track after the detection signal CTO is inverted.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a floppy disk driver as a whole. The floppy disk 2 is loaded at a predetermined position, and data can be read and written by the magnetic head 3. The magnetic head 3 is moved in the radial direction of the floppy disk 2 by the head drive mechanism 6 converting the rotational movement of a step motor 5 driven and controlled by a drive control circuit 4 shown in detail in FIG. It is moved forward and backward by one step.

An external direction signal ODR for instructing the moving direction of the magnetic head 3 from the external controller 7 to the drive control circuit 4
(FIG. 3 (E)) and a pulse signal for starting the movement operation
STP (FIG. 3 (G)) is provided.

The outermost track "00" sent from the sensor 8 provided to the head drive mechanism 6 is sent to the drive control circuit 4.
When the magnetic head 3 is located outside the track, that is, in a region where no track is formed, the logic "L" level is taken, and when the magnetic head 3 is located on the track inside the outermost track "00", the logic "H" is set. A detection signal CTO (FIG. 3 (B)) having a "" level is provided.

This detection signal CTO is applied to the internal direction generation circuit 9 as shown in FIG. 1, and instructs the inward movement when the detection signal CTO is logic "L" and the outward movement when the detection signal CTO is logic "H". Is supplied to the selector 10 (FIG. 3 (D)). The selector 10 has an external direction signal ODR from the external controller 7.
(FIG. 3 (E)), and a recalibration rate signal RCL which rises to logic "H" in the recalibration rate operation mode from the recalibration rate signal generation circuit 11.
(FIG. 3 (C)) is given as a selection control signal. The selector 10 selects the internal direction signal IDR in the recalibration operation mode, selects the external direction signal ODR in the other operation modes, and outputs the thus obtained direction signal DR (FIG. 3 (F)) to the step motor drive circuit 12. Give to.

The stepping motor drive circuit 12 also includes an external controller 7
, A pulse signal STP (FIG. 3 (G)) is supplied, and in the recalibration operation mode, the step motor 5 is driven at the timing when the pulse signal STP is supplied in the direction indicated by the internal direction signal IDR. In the mode, the step motor 5 is driven at the timing when the pulse signal STP is given in the direction indicated by the external direction signal ODR.

The drive control circuit 4 rises to logic "H" when the power is turned on, and the power-on signal PON (FIG. 3 (A)) which rises to logic "H" when the power is turned on. ), And the power-on signal PON is provided to the re-calibration rate signal generation circuit 11 as a preset signal of the re-calibration rate signal RCL.

The re-calibration rate signal generation circuit 11 also detects the detection signal CTO.
And the detection signal CTO is changed from logic “H” to logic “L”.
, That is, when the magnetic head 3 moves outward and reaches the outermost track "00", the clear rate signal RCL falls. The recalibration rate signal RCL is fed back, and the recalibration rate signal RCL is
When the camera falls, it keeps its state by itself.

The above-described pulse signal STP is supplied to the shift pulse generation circuit 14. The shift pulse generation circuit 14 generates a pulse signal STP
(Fig. 3 (G)) was delayed (accurately delayed inversion)
The shift pulse signal SHP (FIG. 3 (H)) is generated. The shift pulse signal SHP is supplied as a first selection input to a selector 16 via a mask circuit 15, and is directly supplied to the selector 16 as a second selection input. Provided as selection input.

The mask circuit 15 receives the direction signal DR (FIG. 3 (F)) as a mask control signal, and when the direction signal DR instructs outward movement from the inner circumference to the outer circumference (when the logic is "H"), a shift pulse The signal SHP is passed as it is, and the shift pulse signal SHP is masked when the direction signal DR instructs the movement from the outer circumference to the inner circumference (at the time of logic “L”). Thus, the selector 16 is supplied with the mask pulse signal MPL as shown in FIG.

The selector 16 receives the refill rate signal RCL (FIG. 3C) as a selection control signal, and outputs the mask pulse signal MPL when the refill rate signal RCL indicates the refill rate operation mode (logic "H"). And select
To represent another mode (when the logic is "L"), the shift pulse signal SHP is selected. Thus, a selector pulse signal SPL as shown in FIG. 3 (J) is obtained from the selector 16, and is supplied to the latch circuit 17.

The latch circuit 17 receives the above-mentioned power-on signal PON (FIG. 3A) as a preset input, and is preset to logic "H" at power-on. The latch circuit 17 captures the logical level of the detection signal CTO (FIG. 3B) at the timing of the select pulse signal SPL.
Thus, the latch circuit 17 identifies the recalibration rate operation mode and other operation modes similar to the recalibration rate signal RCL, and outputs the mode instruction signal MOD (FIG. 3 (K)) synchronized with the shift pulse signal SHP. It is formed and sent to the external controller 7.

The external controller 7 determines whether the floppy disk driver 1 is in the recalibration operation mode based on the mode instruction signal MOD, and waits for the start of the main operation mode until the recalibration operation mode ends. In addition, it sends out a pulse signal STP necessary for moving the magnetic head 3 in the recalibration operation mode.

The above configuration is formed so that the operation shown in FIG. 4 can be performed. That is, when the power is turned on and the re-calibration operation mode is set (step SP1), it is determined whether or not the magnetic head 3 is inside the outermost track "00" based on the output of the sensor 8 (step SP2). .
Outside (including the outermost track)
Waits for a pulse signal STP from the external controller 7 (step SP3) and moves the magnetic head 3 inward by one track.
Is moved (step SP4), and the external controller 7
(Step SP5), and then renews the magnetic head 3 again.
Check the position of (Step SP2).

On the other hand, when the magnetic head 3 is located inside the outermost track as a result of the detection (step SP2), the pulse signal STP from the external controller 7 is awaited (step SP6) and the magnetic head 3 is moved outward by one track. 3 is moved (step SP7), and the external controller 7 is continuously informed that the apparatus is in the recalibration operation mode (step SP8). Thereafter, the position of the magnetic head 3 is confirmed again (step SP9).

When the detection signal CTO of the sensor 8 is inverted in the determination of the movement from the inner circumference to the outer circumference, the magnetic head 3 is positioned at the outermost track “00”, and the recalibration operation mode is ended. However, the end of the recalibration operation mode is notified (step SP10). On the other hand, if the detection signal CTO of the sensor 8 does not change even when the signal is moved by one track from the inner circumference to the outer circumference, the operation of further moving outward is repeated (steps SP6-SP7-SP
8).

Therefore, according to this processing, if the magnetic head 3 is located several tracks outside the outermost track "00" at the time of power-on, the pulse signal ST from the external controller 7 is output.
Steps SP2-SP3-SP4-SP5 until only one track "01" inside the outermost track "00" is obtained based on P.
-Repeat the loop LP1 of SP2 to move the track
When it becomes "1", it is moved to the outer circumference by one track this time through steps SP6 to SP8, and positioned at the outermost track "00".

If the track is inside the outermost track "00" by several tracks at the time of power-on, after step SP2, the loop LP2 of steps SP6-SP7-SP8-SP9-SP6 is repeated to repeat the outer track one track at a time. When the outermost track "00" is reached, the process proceeds to step SP10 to terminate the recalibration operation.

The more detailed operation of the floppy disk driver 1 shown in FIG. 1 configured to perform such an operation will be described with reference to the timing chart of FIG. 3 so that the magnetic head 3 is positioned outside the outermost track "00". A case will be described.

When the power is turned on and the power-on signal PON rises at time t1, the latch circuit 17 supplies the external controller 7 with a mode instruction signal MOD (logic "H") representing the recalibration operation mode.

As a result, the external controller 7 supplies the pulse signal STP to the floppy disk driver 1 at the time point t2 slightly later than the time point t1. Since the recalibration signal RCL has already risen at the time t1, the time t1
In 2, the selector 10 selects the internal direction signal IDR. Since the magnetic head 3 is located outside the outermost track "00", at this time t2 based on the detection signal CTO.
In this case, the internal direction signal IDR instructs the movement from the outer periphery to the inner periphery. Thus, the step motor driving circuit 12 drives the step motor 5 to move the magnetic head 3 by one track in the inward direction indicated by the internal direction signal IDR. I do.

If the detection signal CTO does not change even by this drive, the magnetic head 3 is similarly moved inward by one track each time the pulse signal STP arrives from the external controller 7 in the same manner.

During such an operation, the shift pulse signal SHP is masked by the mask circuit 15, and the mask pulse signal MPL is selected by the selector 16 and the latch circuit 1
7, the mode instruction signal MOD continuously indicates the recalibration operation mode.

Eventually, even when the track reaches the outermost track “00”, it cannot be determined at this time that the track is the outermost track “00”. At this time (time t3), the pulse signal STP is also given from the external controller 7 and the magnetic head 3 has one track. Moved in minutes. Due to this movement, the detection signal CTO from the sensor 8 rises at time t4, and the internal direction signal IDR also rises.

The mask circuit 15 finishes the mask operation by the rise of the internal direction signal IDR, and thus the select pulse signal SPL is supplied to the latch circuit 17. At this time t5, the detection signal CTO rises, and thus,
The mode instruction signal MOD continuously indicates the recalibration operation mode.

Accordingly, the pulse signal STP is provided at the time point t6 when the pulse signal is continuously drawn from the external controller 7. At this time, since the internal direction signal IDR is rising and instructing the outward movement, the step motor 5 is turned on by the magnetic head 3.
Is moved one track outward. At this time, the magnetic head 3 returns to the position of the outermost track "00".

Due to this movement, the detection signal CTO is inverted again at the time point t7, and becomes logic “L”. As a result, the recalibration signal RCL also falls, and switching is performed so that the selector 10 selects the external direction signal ODR as the direction signal DR. Also, the recalibration signal RCL
Has fallen, the shift pulse signal SHP is
6 is directly supplied to the latch circuit 17 via the latch circuit 17.

Here, after the pulse signal STP is given, the detection signal CTO
Since the time until the shift pulse signal SHP is output is selected to be longer than the time until the signal is inverted, the time t8 when the shift pulse signal SHP corresponding to the pulse signal STP at the time t6 is given to the latch circuit 17 In, the detection signal CTO falls, and thus the mode instruction signal MOD falls, and notifies the external controller 7 that the recalibration operation has ended.

Thereafter, the external controller 7 shifts to the main operation mode, and supplies a pulse signal STP for instructing a predetermined direction and an external direction signal ODR to the floppy disk driver 1 at a predetermined timing as necessary. At this time, since the selector 10 has selected the external direction signal ODR, the step motor 5 operates as instructed by the external controller 7.

Therefore, according to the above-described embodiment, even when the magnetic head 3 is outside the outermost track "00" at the time of power-on, the recalibration operation can be executed. Can be stopped from executing other operation modes.

In the above description, the present invention is applied to the floppy disk driver 1 which is allowed to be powered on while the floppy disk 2 is loaded. However, the floppy disk 2 is loaded after the power is turned on. It is also possible to apply the present invention to a floppy disk driver 1 in which it is desirable to obtain the same effects as described above.

In the above description, the track on the outermost circumference is applied as the track for position reference, but the track on the innermost circumference may be applied as the track for position reference.

Further, in the above, the sensor 8 is provided which has the same logical level as the detection signal CTO when the magnetic head 3 is in the outermost track "00" and when the magnetic head 3 is outside the track "00". As shown, the detection signal CTO may be determined so as to take the same logic level between the outermost track "00" and the case where the magnetic head 3 is located inside the track "00".
In this case, when the magnetic head 3 moves outward and the detection signal CTO is inverted, it is necessary to return the magnetic head 3 to one track inward. However, the same effect as described above can be obtained.

H Effect of the Invention As described above, according to the present invention, even when the magnetic head is located in the non-track area at the time of power-on, the magnetic head can be easily and reliably positioned with a simple configuration without causing an external controller to malfunction. A floppy disk driver that can be positioned on the reference track can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a drive control circuit in an embodiment of a floppy disk driver according to the present invention, FIG. 2 is a block diagram showing an entire configuration of the floppy disk driver, and FIG. 3 is a block diagram of FIG. FIG. 4 is a flow chart showing the flow of processing for a recalibration operation in each part of the drive control circuit 4. FIG. 1 ... Floppy disk driver, 2 ... Floppy disk, 3 ... Magnetic head, 4 ... Drive control circuit, 5
…… Step motor, 8… Sensor, “00”… Outermost track, CTO …… Detection signal.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-35378 (JP, A) JP-A-60-191313 (JP, A) JP-A-60-10475 (JP, A) JP-A-60-1985 136972 (JP, A)

Claims (1)

(57) [Claims] 1. A floppy disk driver for aligning a magnetic head with the position reference track at power-on using the outermost or innermost track as a position reference track, wherein the magnetic head is located at the position reference track. A first detection signal is output when the magnetic head is in the first area including the position reference track and the magnetic head is in the second area not including the position reference track. When the second
And a sensor for outputting the detection signal of the above, and in an operation mode for positioning the magnetic head on the track for position reference, the magnetic head is turned on by the first head upon power-on based on the first detection signal from the sensor. When it is determined that the magnetic head is in the area, the magnetic head is moved from the first area to the second area by one track until the magnetic head enters the second area from the first area based on the output of the sensor. When it is determined that the magnetic head has entered the second area from the first area on the basis of the second detection signal from the sensor while instructing the movement, the head is moved in the reverse direction by one track. Generating a first instruction signal for instructing movement, or the second instruction signal from the sensor;
When it is determined that the magnetic head is in the second area at the time of power-on based on the detection signal, the magnetic head is moved by one track until the magnetic head enters the first area based on the output of the sensor. An instruction signal generating circuit for generating a second instruction signal for instructing movement from the second area to the first area; and the magnetic head based on the first instruction signal or the second instruction signal. And a motor driving circuit for controlling the driving of the driving motor.