JPS6378382A - Floppy disk controller - Google Patents

Abstract

PURPOSE:To prevent the occurrence of undesired noise by using a step rate of a step pulse to control a clock driving a step motor thereby moving a head and smoothing the movement of the head. CONSTITUTION:In order to read objective data from a floppy disk controller 1, when a step pulse is fed to a microprocessor 6 via a receiver 5 and a step signal corresponding to the step pulse is fed to a step motor driver 7 by the microprocessor 6. Then a step motor 8 is driven synchronously with the step signal. The step motor 8 and a head carriage 9 are connected mechanically and the carriage 9 is moved linearly so that the head comes on each track of the diskette corresponding to the drive of the step motor.

Description

[Detailed Description of the Invention] [Summary] A step rate is used to move the head of a floppy disk device, but the step rate of movement causes carrier resonance, etc., which generates unnecessary noise during seek. do. In the present invention, the head is moved by controlling the clock that drives the stembmoke according to the step rate of the step pulse applied to the floppy disk device.

The present invention makes it possible to provide a floppy disk control device in which the head moves smoothly and unnecessary noise is prevented.

[Industrial application field]

The present invention relates to a floppy disk device, and more particularly to a floppy disk control device that controls head movement.

1 [Prior Art] Floppy disk devices are small-capacity auxiliary storage devices, and because they are inexpensive and small, they are used in various devices such as parts, null computers, and word processing sensors.

Flo-7P disk devices are generally disks 1-
(Note 1. Medium) is rotated and data is stored in trunks set on concentric circles. Data reading and data corruption are generally performed in units of trunks or sectors provided within one rank. It is set in the position.

For example, write the desired data 1. When reading a sector in a track that is currently being read, the head is moved to the position of the track where the sector is located, and then reading is performed.

Conventionally, a step motor having four phases per revolution has been used to move the above-mentioned head.

The rotation is converted into a straight line so that it moves, for example, one trunk in half a rotation, that is, in two phases. Further, when a linear step motor is used, it is configured to move by one track in two phases.

The floppy disk controller that controls the floppy disk device has a circuit that generates the step pulse to move the head as described above, and applies the step pulse corresponding to the movement to the floppy disk device in order to move the head to the target trunk. ing. and,
The head is moved in response to the step pulse.

FIG. 7 (al) is a flowchart of step processing for step pulses of a conventional Fronby Disc Seco. When one step pulse is applied, the Fronby Disk device executes this process.

First, first internal step processing 320 is performed. As mentioned above, generally in order to move one track, the step motor must be rotated by two phases. This 2
The first internal step 320 drives one phase. This process rotates step 320 by one phase.

Motors generally have inertia and require time to rotate one phase even when moving one phase. The timer (T3) setting process 321 sets this time, that is, sets the time required before rotating the next one phase.
It is. Through this process, the device enters a standby state for the set time, and then the second internal step process S22 is performed. Through this process S22, the next phase rotation is performed, and the target rotation, that is, the motor rotates two revolutions, in the first internal step process S20 and the second internal step process S22. When this process S22 is finished, next, a tie 11 over interrupt setting process S23 is performed and the step process for one step pulse is finished.

The quit over interrupt setting process S23 is an interrupt setting process for stopping energization to the pulse motor when pulses are not continuously applied next time. For example, when a step pulse is applied again next time, the above-mentioned process is performed again, and the rotation becomes continuous, and the time-over interrupt setting process S
23, and the interrupt time is set again in step S23. That is, the interrupt time is updated. Conversely, when the next step pulse is no longer applied, the time-over interrupt process is driven by the interrupt and executed after a specific time (FIG. 7(b)). Due to this interruption, step motor power-off processing S24 is executed, and the power supply to the step motor is turned off.

Step motors have a large static torque and maintain their position even when not energized. For example, the head is set at a target position and data is read or written from a stable state, but it is not necessary to always apply electricity at this time. Therefore, by turning off the power, it is possible to increase heat generation and power efficiency of the step motor.

[Problem that the invention seeks to solve]

In the step process of the floppy disk device described above, the time setting in process S21 is performed between the first internal step process S20 and the second internal step process S22, and provides a specific time between these processes. Determined by rotation speed. That is, the time required for the step motor to rotate to the next phase position, for example 1.
5 m5ec.

On the other hand, the Frembie disk controller generates step pulses with a fast pulse rate or step pulses with a slow pulse rate depending on the setting conditions given.

m811ffl(a) is a diagram showing the relationship between the head feed amount and time during the conventional slow template, and FIG. 8(b) is a diagram showing the relationship between the feed amount and time during the fast template rate. In FIG. 8(al) and (b), the horizontal axis represents time, and the scale represents the time when the step pulse is applied.

As is clear from Fig. 8 (bl), when a step pulse with a fast pulse rate is applied, the head feed plate changes linearly and sequentially. In other words, it moves smoothly. This is a floppy disk device. 1 in step S21 of FIG. 7 (al) described above so that the
．． Because I set it as 5 m5ec.

It is. On the other hand, when a step pulse with a slow step rate is applied as shown in FIG. This causes the motor to remain in that position until the next step pulse arrives.In other words, it rotates and stops repeatedly.This movement is synchronized with a slow step rate, so
Although there was no problem with its function as a floppy disk device, there was a problem in that the head and head carrier resonated at their respective resonance frequencies when starting or stopping rotation. In other words, unnecessary sound was generated because the same weight was not smooth.

The present invention overcomes the above-mentioned conventional drawbacks by providing a fast template.
However, another object of the present invention is to provide a floppy disk control device that moves the head smoothly even at a slow step rate and prevents the generation of unnecessary sounds.

[Means for solving problems]

FIG. 1 is a functional block diagram of the present invention.

Reference numeral 1 denotes a floppy disk controller 1, which generates step pulses and data read/write control signals to drive the floppy disk device. 2 is a step rate determining means to which the step pulse from the floppy disk controller 1 is applied, which determines whether the applied step pulse rate is high or low, and generates a drive signal for the step motor corresponding to the step rate. do. 3 is a head moving means to which a drive signal from the step rate determining means 2 is applied, and the step motor is driven by the drive signal.

[For production]

The floppy disk controller 1 applies a step pulse with a fast step rate or a step pulse with a slow step rate, but the step pulse with a fast step rate or a slow rate is determined by the step pulse with a fast pulse rate or a slow pulse rate with the step pulse with a slow step rate. A drive signal is applied to the head moving means based on the determination result. As a result, the step motor is driven with a fast phase rotation when the step rate is fast, and with a slow phase rotation when the step rate is slow, and both fast and slow step rates correspond to that step rate. This ensures smooth rotation.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention.

Floppy disk controller 1 is Flo-7Pide,
This is a circuit that controls the disk device 4 and performs data corruption and reading 7. Naturally, control signals related to writing and reading are applied from the floppy disk controller 1 to the floppy disk device 4. This control signal is applied to the microprocessor 6 via the receiver 5 in the floppy disk device 4. The receiver 5 is a circuit that controls whether or not to receive the above-mentioned signal applied from the floppy disk controller 1, and when the drive select signal applied from the floppy disk controller 1 matches the preset j position, , takes in the applied control signals and outputs them to the microprocessor 6.

The microprocessor 6 is a circuit that performs various controls using control signals applied via the receiver 5, and includes a read-only memory (ROM) (not shown) in which a program for performing control is stored, and a step motor driver (described below). It also has an input/output circuit for outputting signals to, etc., and a random access memory (RAM) for a work area used in the above-mentioned program. This control program performs operations such as moving the head to a target track, reading and writing data, and inputting and outputting data to an external circuit. The configuration diagram of the embodiment of the present invention shown in FIG. 2 describes the step motor circuit according to the present invention, but other write and read circuits are not directly related to the present invention, so for the sake of simplification of explanation, “Because of this, it is dangerous.

In order to read the desired data from the floppy disk controller 1, the microprocessor 6 is sent via the receiver 5.
When a step pulse is applied to the microprocessor 6, the microprocessor 6 applies a step signal corresponding to the step pulse to the step motor dry half. The step motor driver 7 drives and rotates the step motor 8 in synchronization with the step signal. Although not shown, the step motor 8 and the head carriage 9 (on which the head is installed) are mechanically connected, and the carriage 9 moves the head over each track in the diskette in response to the rotation of the step motor. move in a straight line.

The present invention relates to the movement of the head described above.

FIG. 3 (al, (bl) is a flowchart of processing when a step pulse of the microprocessor 6 is applied. In the embodiment of the present invention, the step pulse, that is, 1
Two types of movement control are performed on pulses for moving the head by a track. Hit 5 Control is performed in LOW mode and FAST mode (SLOW mode is a mode that controls the rotation of the step motor in response to slow step pulses, and FAST mode is a mode that controls rotation of the motor in response to fast step pulses).

First, when a step pulse is applied, processing S1 is performed to determine whether the pulse motor is currently being controlled in the 5LOW mode. When in the 5LOW mode, it is determined whether or not T1 time has elapsed since the previous step pulse was applied.
2 (When the first pulse is applied, 5L
OW mode is set, and it is determined that T1 time has elapsed).

In this judgment, if T1 time has passed, 5LOW
mode, the 5LOW mode setting process S3 is performed.

Then, processes 84 to S6 for performing slow rotation are performed.

In the embodiment of the present invention, there are 4 phases and 1 rotation, and 2
Since the square is configured to move by one track by rotation, the square rotates by A, so a first internal step process S4 is performed to rotate it by one phase.

FIG. 4 is a diagram showing the relationship between the phase and current direction of the pulse motor in the embodiment of the present invention. Dimensions 1 to 4 represent coils, and φA to φB represent phases. The direction of current flowing during each phase is represented by "+" and "-". Since the pulse motor rotates once by sequentially flowing the currents for the phases φΔ to φD, the pulse motor rotates in the reverse direction by driving the phases in the order of φD to φA.

For example, if the rotation is normal and the current pulse motor is at the position of phase φB, the pulse motor 8 is driven at phase φC in the first internal step S4 described above.
starts two rotations. The motor has inertia, and after this process S4, a process S is performed to set the timer to time T2.
Step 5 will be performed, and the device will be in a standby state until the end of this 72 hours. After time T2 has elapsed, the pulse motor is driven at the next phase, for example, phase φD, in a second internal step S6.

This causes the pulse motor to rotate A. T2 mentioned above
The time is, for example, 3 msec. That is, in the 5LOW mode, there is an interval of 3 msec between the first drive and the second drive. Then, timer setting and time-over interrupt setting processing S7 is performed. The timer setting process is a process that sets the time for the next step pulse to be applied, and the time-over interrupt setting process generates an interrupt to set or turn off the step motor power when the next step pulse is not applied. It is processing. In this process, the process when one step pulse is applied ends.

For example, as shown in Fig. 5 fb), a slow step pulse S
When PSs are added sequentially, the first internal step process S4
(phase φC) is performed almost at the same time as the pulse is applied, and after T2 seconds have elapsed, the second step processing 36 (phase φB) is performed. When the next step pulse is applied, it is determined in determination S2 whether or not time T1 has elapsed; however, since the step rate is slow, the next first internal step process 34 (phase φA )I do. By sequentially repeating this, the phase φC9φB,
φA, φD, φC, . . . are driven.

On the other hand, when the step is fast, the operation is different from that described above. When the first step pulse is input, processes $1 to S6 are performed in the same manner as described above.

This is because for the first step pulse, it is unclear whether the step pulse is applied quickly or slowly. Then, when the next step pulse is applied, because it is fast, it is applied without patency at the specific time, so the time is within time T1, and the process branches (N) in the determination process S2.

Next, a determination S8 is made as to whether or not the time T5 has elapsed. That is, it is determined whether time T5 has elapsed since the time set after the second internal step S6 driven in response to the first step pulse. The T5 time is the minimum response time for one-phase driving of the step motor in the embodiment of the present invention. Therefore, the next drive must not be performed when the T5 time has not elapsed (N).
Repeat this determination again. And when T5 hours have passed (
For Y), next, FAST mode setting processing S9 is performed. This process sets the FAST mode.

Next, the first internal step SIO, timer setting (T3
) Processing S11 and second internal step processing S12 are performed. Note that the first internal step knob process and the second internal step process are the same as the process 34. It is the same as S6. The difference is that the setting time in the timer setting process S11 is different. Although the time T2 was 3 msec, it is set to 1.5 msec in FAST mode. That is, there is 1 between the first internal step processing and the second internal step processing.
．． There is an interval of 5 msec. After the second internal step 312, the above-mentioned process S7 is executed and the present process ends. Discrimination from the next step pulse (3rd) onwards $
1, it is determined that it is not in the 5LOW mode (N), and since the previous drive was in a fast mode, T5 has passed and the step pulse is added, and almost at the same time, the first internal step process $10 causes phase rotation (rotation). 1.
After 5 milliseconds, the process S7 is sequentially repeated as the next phase rotation (Z rotation).

FIG. 5(a) shows the quimature 1 in the FAST mode according to the embodiment of the present invention. As described above, the phase rotation is performed by the first fast step pulse SPF, and the next phase rotation is performed after a further time T2. Then, the next step pulse is input at a speed (input), so wait until T5 seconds after the second phase rotation and start the next phase rotation by 1.5 m.
Perform the next phase rotation after a second. Furthermore, from now on, each time one step pulse is applied, one phase rotation and the phase rotation after 1.5 msec are repeated. This repetition is repeated as the phases φC9φB, φA, φD, . . . in the same manner as in the 5LOW mode described above. Note that the phases φC0φB, φA.

φD is in the case of reverse rotation, and in the case of reverse rotation, it is driven in the opposite phase.

In the final step S7 of the step process in FIG. 3(a), a time-over interrupt is set. This time-over interrupt setting occurs when one continuous head movement is completed when a specific time has elapsed since step pulses are no longer applied, for example, when writing or reading is being performed, or when such processing is completed. Therefore, in the embodiment of the present invention, the mode is set to 5.
The mode is set to LOW, and the drive of the steering knob motor is stopped. Since this process is set to interrupt in process S27, the second step process S, 6. S12
An interrupt occurs when the TX time elapses after performing 5LOW, which is stopped by the interrupt processing, that is, the time over processing.
A mode setting process S13 is performed, and then a step motor power-off process S14 is performed. As a result, Fig. 5(a),
(As shown in bl, from the final second internal step processing to T
After X time, for example, 20 milliseconds, the power to the step motor is turned off.

Figures 6(a) and (b) show 5LOW mode and FAS
It is a relationship diagram of the feed amount and time in T mode. When compared with Fig. 8, it is the same in FAST mode, but 5LOW
The feed amount when in mode changes smoothly (note that the tick marks on the time axis indicate when a step pulse is applied).

The present invention has been described in detail above using examples of the present invention. In the embodiment of the present invention, the head moves in two phases during the rotation of the step pulse, and moves by one track. However, the head is not limited to this, and may move by one trunk by many phase rotations such as three or four phases. It is also possible to move the head even more smoothly in this case.

〔Effect of the invention〕

As described above, the present invention determines the interval (step rate) between applied step pulses and drives the pulse motor based on the result. Therefore, whether the step rate is fast or slow, the step rate is To provide a floppy disk control device that does not repeat rotation and stop, moves the head smoothly at both fast and slow step rates, and prevents generation of unnecessary sounds. Can be done.

[Brief explanation of the drawing]

Figure 1 is a functional block diagram of the present invention; Figure 2 is a configuration diagram of an embodiment of the present invention; Figure 3 (al is a flowchart of step processing in the embodiment of the present invention; Flowchart of time-over processing in the embodiment, Fig. 4 is a diagram of the relationship between phase and current direction, Fig. 5 (al is a timing chart in FAST mode, Fig. 5(b) is a timing chart in 5LOW mode, Figure 6 (a) is a relationship diagram between feed amount and time in 5LOW mode, Figure 6 (b) is a relationship diagram between feed amount and time in FAST mode, Figure 7 (al is conventional step processing Figure 7(b) is a flowchart of conventional time-over processing, Figure 8(a) is a diagram of the relationship between feed amount and time at a slow step rate, Figure 8 (bl is a flowchart at a fast step rate). It is a relationship diagram between amount and time. 1... Floppy disk controller, 2... Step rate determining means, 3... Head moving means.

Claims (1)

[Claims] A step rate determining means (2) for determining whether the time interval of head movement pulses applied from a floppy disk controller (1) is short or long, and a drive clock of a step motor for moving the head is controlled based on the result of the determining means. A floppy disk control device comprising: a head moving means (3) for moving the head.