JPH08129821A - Floppy disk device - Google Patents

Abstract

PURPOSE: To exactly detect a changeover of floppy disk media in a floppy disk drive and to inform a host system of the state of the floppy disk drive. CONSTITUTION: The device is equipped with a floppy disk controller 1 for performing a control operation upon receipt of a command from the host system and the floppy disk drive 2 for performing a write/read operation on a floppy disk medium upon receipt of a control action of the floppy disk controller 1. A signal selecting circuit consisting of an OR circuit 4, a NAND circuit 5 and an AND circuit 6 to correspond to inputs of input/output signals including a motor control signal 12 and a control signal 11, etc., a ready signal 13 and a disk change signal 14 is included in the device as an interface between the floppy disk controller 1 and the floppy disk drive 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disk device.

[0002]

2. Description of the Related Art A conventional floppy disk drive has a structure as shown in FIGS. FIG.
A first conventional example of a floppy disk drive includes a floppy disk controller 1 connected to a host system (not shown) and a floppy disk controller 1.
An interface between the floppy disk controller 1 and the floppy disk drive 2 is provided from the floppy disk controller 1 to the floppy disk drive 2. The O of the motor provided in the floppy disk drive 2 is output.
The motor control signal 12 for controlling N / OFF and the floppy disk drive 2 to the floppy disk drive 2
A ready signal 13 that is output to the controller 1 and indicates that a write / read operation is possible, and a control signal 11 for other write / read operations.

Further, FIG. 4 shows a second conventional floppy disk.
The disk device is similar to the above-described first conventional example,
A floppy disk controller 1 connected to a host system (not shown) and a floppy disk drive 2 are provided, and the floppy disk controller 1 and the floppy disk drive 2 are provided. As an interface between the floppy disk controller 1 and the floppy disk drive 2, the motor provided in the floppy disk drive 2 is turned on.
/ OFF control, and a disc change (Disc Change) signal 14 output from the floppy disk drive 2 to the floppy disk controller 1 and indicating that the medium has been ejected.
And other control signals 11 for writing / reading
Etc. The disc change signal 14 is
This signal is active when the medium is ejected from the floppy disk drive 2 and is kept active even when the medium is reinserted after that. When a step pulse signal, which is one of the two signals, is input, it returns to the inactive state. However, even if the state of the disk change signal 14 changes, the floppy disk controller 1 does not generate an interrupt to the connected host system, and the floppy disk controller 1 Only the status of the disk change signal 14 to the host system is output to the host interface register. Further, in the floppy disk controller 1, the ready signal 13 input from the floppy disk drive 2 is received, and the floppy disk drive 2 is always regarded as a ready signal and operates. Is the reality.

[0004]

In the above-mentioned conventional floppy disk drive, in the case of the first conventional floppy disk drive, the motor control signal 12 output from the floppy disk controller 1 is output. While the motor in the floppy disk drive 2 is inactive and the motor in the floppy disk drive 2 is stopped, if the medium is ejected and inserted again, the level state of the ready signal 13 from the floppy disk drive 2 is changed. Is not changed, the exchange of the media cannot be detected in the floppy disk controller 1, and an interrupt to the host system cannot be generated.

Further, according to the above-mentioned drawbacks, even in the host system, the floppy disk drive 2 cannot detect the exchange of the medium, so that the wrong data is written / written on the exchanged medium. There is a drawback in that the state in which the reading is executed occurs and the data written in the medium is destroyed especially in the writing operation.

In the case of the floppy disk device of the second conventional example, the means for detecting the ready state of the floppy disk drive 2 is not provided in the floppy disk controller 1. The operation is performed assuming that the floppy disk drive 2 is always in the ready state, so that even if the motor control signal 12 becomes active, the motor in the floppy disk drive 2 becomes active. There is a disadvantage that an abnormality cannot be detected when the rotation is not performed normally.

Further, since the interruption does not occur due to the exchange of the medium, the host system needs a procedure for confirming whether or not the medium has been exchanged with the floppy disk controller 1. There is a drawback in that the control operation for the floppy disk controller 1 by the host system becomes complicated.

[0008]

A floppy disk device of the first invention is connected to a floppy disk drive for writing / reading to / from a floppy disk medium, and is connected to a predetermined host system. In a floppy disk device comprising a floppy disk controller for controlling a floppy disk drive, a ready signal and a disk change signal output from the floppy disk drive are input to the floppy disk controller. The floppy disk controller is controlled by a motor control signal that is output and input to the floppy disk drive, selects one of the ready signal and the disk change signal, and inputs the signal to the floppy disk controller. That the signal selecting means, Intafe between at least said floppy disk controller and a floppy disk drive - is characterized by comprising a scan unit.

A floppy disk drive according to a second aspect of the present invention is a floppy disk drive for writing / reading to / from a floppy disk medium, and the floppy disk drive connected to a predetermined host system. A floppy disk device comprising a floppy disk controller for controlling a drive, wherein the floppy disk controller comprises:
Connected to a given host system
Floppy disk drive that controls the disk drive
The controller internal circuit and the floppy disk
Ready signal output from the drive and disc
Input the change signal to the floppy disk
Output from the controller internal circuit
And a signal selection means for selecting one of the ready signal and the disk change signal and inputting it to the floppy disk controller internal circuit under the control of a motor control signal input to the disk drive. It is configured to include at least.

Further, the floppy disk device of the third invention is a floppy disk drive for writing / reading to / from a disk medium, and the floppy disk drive connected to a predetermined host system. In a floppy disk device including a floppy disk controller for controlling, the floppy disk drive includes a floppy disk drive internal circuit for writing / reading to / from a floppy disk medium, and the floppy disk drive. Input the ready signal and disk change signal output from the controller internal circuit,
Controlled by a motor control signal output from the floppy disk controller and input to the internal circuit of the floppy disk drive, selecting either one of the ready signal and the disk change signal, And a signal selecting means for outputting to the floppy disk controller.

In the above-mentioned first, second and third aspects of the present invention, the signal selecting means may include an OR circuit for calculating a logical sum of the ready signal and the motor control signal and outputting the logical sum. A NAND circuit that takes the logical product of the disk change signal and the motor control signal and outputs the result; and an AND circuit that takes the logical product of the output of the OR circuit and the output of the NAND circuit and outputs the result. Is also good.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. As shown in FIG. 1, this embodiment includes a floppy disk controller 1 which performs a control operation in response to a command from a host system (not shown);
A floppy disk drive 2 that performs a write / read operation on a floppy disk medium under the control of the floppy disk controller 1 is provided. These floppies
Disk controller 1 and floppy disk drive
An interface with the drive 2 includes a motor control signal 12 output from the floppy disk controller 1 to the floppy disk drive 2 for controlling ON / OFF of a motor provided in the floppy disk drive 2. And the OR circuit 4 which receives the ready signal 13 and the motor control signal 12 which are output from the floppy disk drive 2 and indicate that the write / read operation is possible, and which are output from the floppy disk drive 2. A NAND circuit 5 to which a disk change signal 14 and a motor control signal 12 indicating that the medium has been ejected are input, and an A to which the output of the OR circuit 4 and the output of the NAND circuit 5 are input.
A signal selection circuit including the ND circuit 6, a control signal 11 for writing / reading, and the like. The above-mentioned signal selection circuit is used for the ready signal 13 or the disk change signal 14 output from the floppy disk drive 2.
One of the two is selected and input to the floppy disk controller 1. When the motor control signal 12 is at the active "LOW" level, the ready signal 13 is selected and the motor control signal 12 is at the inactive "HI" level.
At the time of "GH" level, the disk change signal 11 is selected and input to the floppy disk controller 1. The output signal of the AND circuit 6 is shown as a ready / disk change signal 15 in FIG. However, the function of the signal input by the ready / disk change signal 15 is the same as that of the ready signal input to the floppy disk controller 1 in the conventional example. On the other hand, when the state transition interrupt of the floppy disk drive 2 occurs, or at the start of the write / read operation to the floppy disk drive 2, the ready / disk change signal 15 is checked. Floppy disk
It is used as a signal for determining whether or not the drive 2 is in a ready state.

In the floppy disk drive of this embodiment having the above-described configuration, when the motor of the floppy disk drive 2 is stopped, that is, when the motor control signal 12 is at the inactive "HIGH" level, An inverted signal of the disc change signal 14 is selected as the disc change signal 15, and the floppy
Input to the disk controller 1. In this state, if a medium is inserted in the floppy disk drive 2, the disk change signal 14
Is at the “HIGH” level, so that the floppy
The ready / disk change signal 15 input to the disk controller 1 is at the "LOW" level. In this state, when the medium is taken out from the floppy disk drive 2, the disk change signal 15 changes from "HIGH" level to "LOW" level.
Change signal 15 changes from "LOW" level to "HIGH"
Change to a level. As a result, the floppy disk controller 1 detects a change in the level of the ready / disk change signal 15 and generates an interrupt request to the host system. Therefore, even when the motor of the floppy disk drive 2 is stopped, it is possible to detect that the medium has been ejected.

On the other hand, the floppy disk drive 2
If the motor is rotating normally, that is, if the motor control signal 12 is in the active "HIGH" level state, the ready signal 13 is selected as the ready / disk change signal 15, and the floppy disk is selected. -It is input to the controller 1. In this state, when the medium is inserted in the floppy disk drive 2, since the motor is rotating and the medium is inserted, the ready signal 13 is at the "LOW" level. The ready / disk change signal 15 input to the disk controller 1 is also "L".
It is output in the OW "level state. In this state,
When the medium is taken out from the floppy disk drive 2, the floppy disk drive 2 becomes a non-ready state, the ready signal 13 changes from "LOW" level to "HIGH" level, and in response to this level change, it becomes ready. / Disk change signal 15 is also "LOW"
The level changes from "HIGH" level. As a result, the floppy disk controller 1 detects a change in the level of the ready / disk change signal 15 and generates an interrupt request to the host system. Therefore, even when the motor of the floppy disk drive 2 is rotating, it is possible to detect that the medium has been ejected.

Further, even if the floppy disk drive 2 does not enter the ready state because the motor does not rotate normally while the motor control signal 12 is at the active “LOW” level,
As the disk change signal 15, the ready signal 13 output from the floppy disk drive 2 is selected and input to the floppy disk controller 1, so that the floppy disk controller 1 Ready / non-ready can be detected.

FIG. 2 is a block diagram showing a second embodiment of the present invention. As shown in FIG. 2, the present embodiment is controlled by the floppy disk controller 1 and the floppy disk controller 1,
A floppy disk drive 2 for writing / reading to / from a floppy disk medium. A command from a host system (not shown) is received inside the floppy disk controller 1. , A floppy disk controller internal circuit 3 for performing a control operation, an OR circuit 4, an NA
A signal selection circuit including an ND circuit 5 and an AND circuit 6 is provided. As an interface between the floppy disk controller 1 and the floppy disk drive 2, a floppy disk drive 2 output from the floppy disk controller internal circuit 3 to the floppy disk drive 2 is provided. And a ready signal output from the floppy disk drive 2 to the floppy disk controller 1 and indicating that a write / read operation is possible. 13, a disc change signal 14 indicating that the medium has been ejected, a control signal 11 for writing / reading, and the like. The above-mentioned signal selection circuit is used for the ready signal 13 or the disk change signal 1 output from the floppy disk drive 2.
4 is a circuit which selects one of the signals and inputs the selected signal to the floppy disk controller internal circuit 3. When the motor control signal 12 is at the active "LOW" level, the ready signal 13 is selected and the motor control signal 12 is turned on. At the time of the active "HIGH" level, the disk change signal 14 is selected and inputted to the floppy disk controller 1, respectively. In FIG. 2,
The output signal of the AND circuit 8 is shown as the ready / disk change signal 15. The function of the signal input by the ready / disk change signal 15 is that of the ready signal input to the floppy disk controller 1 in the conventional example. Similar to the case, the state change of the ready / disk change signal 15 causes an interrupt of the state transition of the floppy disk drive 2 to the host system, and writing / writing to the floppy disk drive 2. At the start of the read operation, the signal is checked and the floppy
It is used as a signal for determining whether the disk drive 2 is in the ready state.

The second embodiment having the above-mentioned configuration is an OR circuit 4, a NAND circuit 5 and an AND circuit in the first embodiment.
A ready signal 13 and a disk change signal 14 output from the floppy disk drive 2 in accordance with the level of the motor control signal 12 output from the floppy disk controller internal circuit 3;
It is characterized in that the signal selection circuit for selecting and outputting any one of the above is incorporated in the floppy disk controller 1 and incorporated therein.
This is the same as the embodiment, and the description thereof is omitted. It should be noted that the present embodiment has an advantage that the number of components for constituting the floppy disk device can be reduced as compared with the first embodiment shown in FIG. Similarly, the floppy disk shown in FIG.
It is also possible to realize that the signal selection circuit built in the controller 1 is built in the floppy disk drive 2.

[0019]

As described above, according to the present invention, the floppy disk drive is controlled according to the level of the motor control signal output from the floppy disk controller and input to the floppy disk drive. By switching the ready signal and disk change signal output from the controller and inputting them to the floppy disk controller, the floppy disk controller accurately detects the state of the floppy disk drive and responds to the corresponding state change Host
By effectively performing the interrupt operation for the system, regardless of the rotation of the floppy disk drive motor, even if the medium is ejected and reinserted, the interrupt to the host system can be performed normally. There is an effect that can be.

Also, in the host system, since the exchange of the medium can be detected in the floppy disk drive, data is properly written / read to / from the exchanged medium, and the data is written to the medium. This has the effect of eliminating the problem of destroying stored data.

Furthermore, since the state in which the floppy disk drive operates assuming that it is in the ready state is eliminated, the motor does not rotate normally even if the motor control signal becomes active. There is an effect that an abnormal state can be detected.

Further, in the host system,
This eliminates the need for the floppy disk controller to confirm whether or not the medium has been exchanged. This has the effect of eliminating extra control of the floppy disk controller by the host system.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional example.

FIG. 4 is a block diagram showing a configuration of another conventional example.

[Explanation of symbols]

 1 Floppy Disk Controller 2 Floppy Disk Drive 3 Floppy Disk Controller Internal Circuit 4 OR Circuit 5 NAND Circuit 6 AND Circuit 11 Read / Write Control Signal 12 Motor Control Signal 13 Ready Signal 14 Disk Change Signal 15 Ready / Disk change signal

Claims (4)

[Claims] 1. A floppy disk drive for writing / reading to / from a floppy disk medium, and a floppy disk drive connected to a predetermined host system for controlling the floppy disk drive.
In a floppy disk device including a disk controller, a ready signal and a disk change signal output from the floppy disk drive are input,
The floppy disk controller is controlled by a motor control signal output from the floppy disk controller and input to the floppy disk drive, and the floppy disk is selected by selecting one of the ready signal and the disk change signal. A floppy disk device comprising a signal selecting means for inputting to a disk controller as at least an interface means between the floppy disk controller and the floppy disk drive. 2. A floppy disk drive for writing / reading to / from a floppy disk medium, and a floppy disk drive connected to a predetermined host system for controlling the floppy disk drive.
A floppy disk device comprising a disk controller, wherein the floppy disk controller is connected to a predetermined host system to control the floppy disk drive, and the floppy disk controller internal circuit.・ Input the ready signal and disk change signal output from the drive,
Controlled by a motor control signal output from the internal circuit of the floppy disk controller and input to the floppy disk drive, selecting either one of the ready signal and the disk change signal, A floppy disk device comprising at least a signal selecting means for outputting to a floppy disk controller internal circuit. 3. A floppy disk drive for writing / reading to / from a floppy disk medium, and a floppy disk drive connected to a predetermined host system for controlling the floppy disk drive.
In a floppy disk device including a disk controller, the floppy disk drive is a floppy disk drive.
The floppy disk drive internal circuit for writing / reading to / from a disk medium, and the floppy disk controller by inputting a ready signal and a disk change signal output from the internal circuit of the floppy disk controller The floppy disk drive is controlled by a motor control signal that is output from the floppy disk drive internal circuit and is selected from the ready signal and the disk change signal.
A floppy disk device comprising at least a signal selecting means for outputting to a controller. 4. A NAND circuit in which the signal selecting means calculates a logical sum of the ready signal and the motor control signal and outputs the logical product, and a logical product of the disk change signal and the motor control signal and outputs the logical product. 4. The floppy disk device according to claim 1, wherein the floppy disk device comprises a circuit and an AND circuit that outputs a logical product of the output of the OR circuit and the output of the NAND circuit.