JPH04167273A - Floppy disk identifier - Google Patents

Abstract

PURPOSE:To intentionally detect an HD OUT signal in a soft manner by selecting a floppy disk memory by a spindle motor control signal to be output from a floppy disk controller and obtaining a state of a floppy disk identification hole. CONSTITUTION:An EM0 of an output for rotating a motor is supplied from an intelligent controller (FCD) 1 to a MOTOR ON signal of a floppy disk memory (FDD) 2 to control the FDD 2, and also supplied to a DS0 (DRIVE SELECT 0). Accordingly, after the rotation command of the motor is issued to the FDC 1, i.e., while the signal of the EM0 is effective, an identification signal of FD (floppy disk) is output from the HD OUT. Thus, the HD OUT signal can be inspected intentionally.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a floppy disk identification device for personal computers, word processors, and other information office equipment.

(Prior Art) In recent years, floppy disk storage devices (hereinafter referred to as FDD) have been used as external storage devices for OA information equipment such as personal computers.

Information such as text is stored as a file on a floppy disk (hereinafter referred to as FD) using an FDD.

A conventional floppy disk identification device will be explained below.

3.5-inch FDs are classified into two types depending on storage density: high-density floppies (hereinafter referred to as 2HD) and double-density floppies (hereinafter referred to as 2DD). These two types of FDs are provided with identification holes for identification.

Furthermore, an intelligent controller (hereinafter referred to as FDC) for controlling this FDD has been developed and is in use. This FDC can control reading from the FDD, writing to the FDD, rotation of the spindle motor of the FDD, etc. by commands.

FIG. 4 shows a block diagram of a conventional floppy disk identification device, in which FDCI and FDD2 are coupled by various control signals. The FDCl side has signals DSO to DS3 for selecting FDD2, which are combined with DRIVE 5ELECTO, which knows that it has been selected, on the FDDZ side. Similarly, EMO to EM3, which rotate the spindle motor of FDD2, and MOTORON are coupled. In the case of FIG. 4, the FDD is assigned to the Oth position.

HD OUT on the FDD side returns the status of the FD's identification hole.

The operation of the floppy disk identification device configured as described above will be explained below. First, when reading or writing to the FD, the head of the FDD 2 is moved to the target position (hereinafter referred to as seek), the spindle motor is rotated, and respective commands for reading and writing are issued to the FDCI. When a seek, read, or write command is issued, the FDCI and DSO signals become valid and FDD2 is selected. The EMO signal becomes valid for rotation of the spindle motor, and the motor of FDD2 is rotated. When issuing a read or write command, it is necessary to provide a dedicated parameter for 2HD or 2DD in the command, and when selecting this parameter, it is necessary to identify the type of FD. Generally, HDOUT is output only when FDD2 is selected.

(Problem to be Solved by the Invention) However, in the above conventional configuration, HD 00T is
Issue seek, read, and write commands to the CI,
It is valid only when the DSO signal becomes valid, and this valid time cannot be determined. Also, F
Since the HD 01JT signal is output only when DD2 is selected, the HD OUT signal cannot be checked at any time. For this reason, it is necessary to use two types of parameters for FDCl, issue the command twice at worst, and read or write if the command is successful.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floppy disk identification device that eliminates the drawbacks of the prior art and can detect the HD OUT signal by software when intended.

(Means for Solving the Problems) The floppy disk identification device of the present invention converts EMO, which is an output for motor rotation from FDCl, into MO of FDI).
The circuit is configured to supply the TORON signal as well as the DSO.

(Function) With the above configuration, the present invention outputs the FD identification signal from the HD OUT after issuing a spindle motor rotation command to the FDC, that is, while the EMO signal is valid, and allows this signal to be output when intended. Can be inspected.

(Embodiment) FIG. 1 is a block diagram of a floppy disk identification device according to an embodiment of the present invention. The same parts as those in the conventional example shown in FIG. 4 are given the same reference numerals, and their explanations will be omitted.

FDCI and FDD2 are connected by a plurality of signal lines, but only the spindle motor control line 3, which is related to the present invention, is shown here. Figure 2 shows the FDD constituting the present invention.
FIG. 2 is a block diagram of the periphery of FDCI and FDCI. FDD2 and F
DCI, FDCI, and DMAC4 are connected by a plurality of control lines, and FDCI, DMAC4, memory 5, and CPU6 are connected by a bus. Figure 3 shows DRIVE 5 inside the FDD.
FIG. 3 is a circuit diagram of an ELECT signal and an HD OUT signal.

The operation of the floppy disk identification device configured as described above will be explained below. The case of reading data from FDDI will be explained. The details regarding the light are the same, so the explanation will be omitted. Explaining based on FIG. 3, generally, the CPU 6 issues commands to the FDCl via the memory 5 in order to start the spindle motor, seek, and read commands. As mentioned above, when issuing a read command, it is necessary to give parameters dedicated to 2HD and 2DD. Next, explanation will be given using FIG. 2. When only one FDD2 is connected, there is no need to use the selection signals DSO to DS3 from the FDC1. DRIVE 5ELEC on FDD side
Just enable TO when necessary. Therefore, in order to be able to select FDC2 using the motor control signal, this signal is set to FDC2(7)DRIVE 5ELECTCN:
Connecting. FDC spindle motor start command
1 enables the signal line connected to EMO of FDCI. This signal line is the MOTOR of FDC2.
DRIVE 5EL as well as being supplied to the ON terminal.
Also supplied to ECTO. This DRIVE 5ELEC
As shown in Fig. 3, the TO terminal is supplied to the inside of the FDD, and also has an OR circuit with the output from the sensor 7 that detects the identification hole of the FD.
When the ECT signal is valid, it is output from HD OUT to the outside of the FDD. Returning to Figure 2 again, after issuing the spindle motor start command to the FDCI, this H
Since D OUT is enabled, the type of FD connected to HD OUT can be identified until the motor is stopped.

Next, a seek command is issued, and before issuing the next read command, the HD OUT is inspected, parameters suitable for the FD are selected, and the read command is issued.

(Effect of the invention) The present invention utilizes a spindle motor control signal.
FDD DRIVE 5ELECT]: By inputting this, a command to start the spindle motor is issued,
By inspecting the HD OUT, it is possible to distinguish between 2HD and 2DD, and it is possible to read and write to the FD, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a floppy disk identification device according to an embodiment of the present invention, FIG. 2 is a diagram around the floppy disk identification device ρ, and FIG. 3 is a circuit diagram for detecting a floppy disk identification hole inside the floppy disk storage device. FIG. 4 is a block diagram of a conventional floppy disk identification device. 1...Floppy disk controller (FDC)
, ), 2 ... Floppy disk storage device (FD
D), 3...Spindle motor control line, 4
...DMA controller (DMAC), 5...
・Memory, 6... CPU, 7... Floppy disk identification hole detection sensor. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] It is equipped with one floppy disk storage device capable of detecting the identification hole of a 3.5-inch floppy disk, and a floppy disk controller for controlling the floppy disk, and utilizes a spindle motor control signal output from the floppy disk controller. A floppy disk identification device characterized in that it is possible to select a floppy disk storage device by selecting a floppy disk storage device and obtain the state of an identification hole of the floppy disk.