JPH04112317A - Floppy disk drive controller - Google Patents

Abstract

PURPOSE:To improve the operability of a floppy disk drive device by giving a command to the floppy disk drive device regardless of the drive No of the drive device. CONSTITUTION:A drive selection circuit 11 selects the floppy disk drive devices 6 and 7 to be controlled based on the drive selection signal received from a command decoding circuit 10. Then a control signal is outputted. The drive selection signal generating circuit 12 and 13 produce the drive selection signals corresponding to the drive Nos of both devices 6 and 7 to be controlled based on the drive selection signal of the circuit 10. Both devices 6 and 7 selected by the drive selection signals are actuated. Thus the drive Nos are optionally set to the devices 6 and 7 so that the operability of these devices can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk drive control device that controls a plurality of floppy disk drive devices.

[Prior Art] Conventionally, a floppy disk drive control device that controls a plurality of floppy disk drive devices is known.

As shown in FIG. 4, the floppy disk drive control device 1 includes a CPU 2 that processes data and controls each section.
The CPU 2 includes a DMA 4 that transfers data via a pass line 3, a memory 5 that stores data read from the floppy disk and data to be written to the floppy disk, and the CPU 2. It is connected to a control unit 8a that controls the connected floppy disk drive device 6.7 according to instructions from the controller.
The control section 8a includes a floppy disk controller 9.

Different drive numbers are set for each floppy disk drive device 67.

Next, the operation will be explained.

When reading data from a floppy disk, the CPU
2 specifies the floppy disk drive device 6 or 7 (for example, the floppy disk drive device 6) in which the floppy disk to be accessed is set using the drive number, and sends a command signal to the floppy disk controller 9 of the control section 8a.

The floppy disk controller 9, which receives the command signal from the CPU 2, controls the floppy disk drive device 6 specified by this command signal, reads data from the floppy disk set in the floppy disk drive device 6, and stores the data in the floppy disk drive device 6. Store in 5.

Also, when writing data to a floppy disk, C
The data from the PU2 is stored in the memory 5, and the CPU2
Floppy disk drive device 6 or 7 (for example, floppy disk drive device 6
) and sends a command signal to the floppy disk controller 9 of the control section 8a.

The floppy disk controller 9, which receives the command signal from the CPU 2, controls the floppy disk drive device 6 designated by this command signal, and stores data in the floppy disk set in the floppy disk drive device 6 in the memory 5. Write the current data.

[Problem to be Solved by the Invention] Since the conventional floppy disk drive control device is configured as described above, it is necessary to specify the floppy disk drive device by the drive number set in advance for the floppy disk drive device. Moreover, if the drive number of the floppy disk drive device into which the floppy disk is set cannot be specified, there is a problem that the desired floppy disk cannot be accessed.

Furthermore, when floppy disk drive devices having the same drive number are connected, there is a problem that the desired floppy disk cannot be accessed unless the drive number of one of the floppy disk drive devices is changed.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a floppy disk drive control device that can improve operability by arbitrarily setting drive numbers for a plurality of floppy disk drive devices. It is in.

[Means for Solving the Problems] A floppy disk drive control device according to the present invention includes a selection unit that outputs a drive selection command that specifies a floppy disk drive device to be controlled from among a plurality of floppy disk drive devices; A command decoding circuit reads the drive selection command output from the selection means and outputs a read drive selection signal, and a floppy disk drive device to be controlled is selected based on the drive selection signal output from the command decoding circuit and a control signal is generated. and a drive selection signal generation circuit that generates a drive selection signal corresponding to the drive number of the floppy disk drive device to be controlled based on the drive selection signal output from the command decoding circuit. It is characterized by:

[Operation] The floppy disk drive control device according to the present invention outputs, from the selection means, a drive selection command that specifies a floppy disk drive to be controlled from among a plurality of floppy disk drive devices; The command decode circuit reads the drive selection command, outputs a drive selection signal, and based on the drive selection signal output from the command decode circuit, the drive selection circuit selects and controls the floppy disk drive device to be controlled. Based on the drive selection signal output from the command decoding circuit, the drive selection signal generation circuit generates a drive selection signal corresponding to the drive number of the floppy disk drive to be controlled, and the drive selection signal is used to select the drive selection signal. Activate the floppy disk drive device.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a floppy disk drive control device according to the present invention.

The floppy disk drive control device 1, like the conventional device shown in FIG. 4, has a CPU 2 as a selection means for processing data and controlling each part.
A DMA 4 that transfers data via the path line 3, a memory 5 that stores data read from the floppy disk and data to be written to the floppy disk, and a floppy disk connected according to instructions from the CPU 2. A control unit 8 for controlling the disk drive device 6.7 is also connected.

The control unit 8 includes a floppy disk controller 9 connected to the CPU 2, and a command decode circuit 10 that reads a drive selection command output from the CPU 2 and outputs a drive selection signal.

Furthermore, the floppy disk controller 9 and the command decode circuit 10 select the floppy disk drive device 6 or 7 to be controlled based on the drive selection signal 100, 101 output from the command decode circuit 10, and output a control signal thereto. Drive selection circuit 1
1 is connected, and the drive select signal 1 corresponds to the drive number of the floppy disk drive device 6 or 7 to be controlled based on the drive selection signals 100 and 101 output from the command decoding circuit 10.
Drive selection signal generation circuit 12 that generates 02 and 103
．． 13 are connected.

It is also assumed that the drive numbers of the floppy disk drives 6 and 7 are both set to "2".

Next, the operation of this embodiment will be explained along with the timing charts of FIGS. 2 and 3.

FIG. 2 shows a case where the floppy disk drive device 6 is used to write and read data on a floppy disk.
For example, select the floppy disk drive device 6).

Then, the CPU 2 outputs a command for selecting the floppy disk drive device 6 to the control section 8.
Figure a), command decode circuit 1 that receives this command
0 activates only the drive selection signal 100 and activates the drive selection circuit 11 and the drive selection signal generation circuit 1.
2 (Figure 2b).

Then, the drive selection circuit 11 that receives the drive selection signal 100 opens the gate and connects the signal line between the floppy disk drive device 6 and the floppy disk controller 9.

On the other hand, when the drive selection signal 100 becomes active, the drive selection signal generation circuit 12 outputs a drive selection signal 102 with drive number 0 to the floppy disk drive device 6 (FIG. 2C).

At this time, if there is no response from the floppy disk drive device 6 with a ready signal 104 informing that preparation is complete after a predetermined period of time has elapsed, the drive number is changed to 1 and the drive select signal 102 is output again.

The above operation is repeated by changing the drive number to 23, etc. until a response from the ready signal 104 is received. In this embodiment, the drive number of the floppy disk drive device 6 is set to "2", so when the drive number is set to 2 and the drive select signal 102 is output, a ready signal 104 is output (see FIG. 3). d).

Then, when there is a response to the ready signal 104, the drive selection signal generation circuit 12 uses the ready signal 104 as a trigger to generate the drive selection signal 10 outputted at that time.
Hold 2.

As a result, the floppy disk drive device 6 becomes ready.

Then, the CPU 2 controls the floppy disk drive device 6 by setting parameters for the floppy disk controller 9 to write and read data to and from the floppy disk.

Further, FIG. 3 shows a case where the floppy disk drive device 7 is used to write and read data to and from the floppy disk, and the operator operates the operation section of the CPU 2 (
(not shown) to select the floppy disk drive device 7.

Then, the CPU 2 outputs a command for selecting the floppy disk drive device 7 to the control section 8.
In Figure e), data is written to and read from the floppy disk by the same operations as described above.

In the above embodiment, an example was explained in which two floppy disk drive devices were connected to the control unit 8, but the present invention is not limited to the number of floppy disk drive devices, and the drive selection signal generation circuit can be connected to the control unit 8. By adding only the number of floppy disk drive devices, it is possible to support any number of floppy disk drive devices.

[Effects of the Invention] As described above, according to the present invention, the selection means outputs a drive selection command that specifies a floppy disk drive to be controlled from among a plurality of floppy disk drive devices, and the selection means A command decode circuit reads the drive selection command output from the command decode circuit and outputs a read drive selection signal, and the drive selection circuit selects a floppy disk drive device to be controlled based on the drive selection signal output from the command decode circuit. A control signal is output, and a drive selection signal generation circuit generates a drive selection signal corresponding to the drive number of the floppy disk drive to be controlled based on the drive selection signal output from the command decoding circuit. Since the selected floppy disk drive device has been configured to operate, if the drive number of the floppy disk drive device cannot be determined or if a floppy disk drive device with the same drive number is connected, the floppy disk drive device will be activated. Commands can be issued to the floppy disk drive device regardless of the drive number, thereby improving operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a floppy disk drive control device of the present invention, FIGS. 2 and 3 are timing charts showing the operation of the present invention, and FIG. 46 is a configuration of a conventional floppy disk drive control device. FIG. 2... CPU 6.7... Floppy disk drive device 10
... Command decode circuit 11 ... Drive selection circuit

Claims (1)

[Claims] In a floppy disk drive control device that controls a plurality of floppy disk drive devices, a selection for outputting a drive selection command specifying a floppy disk drive device to be controlled from among the plurality of floppy disk drive devices. a command decoding circuit that reads a drive selection command outputted from the selection means and outputs a drive selection signal; and a floppy disk drive device to be controlled based on the drive selection signal outputted from the command decoding circuit. a drive selection circuit that outputs a control signal; and a drive selection signal generation circuit that generates a drive selection signal corresponding to a drive number of a floppy disk drive to be controlled based on a drive selection signal output from a command decode circuit. A floppy disk drive control device comprising: