JP2564878B2 - Multi-mode magnetic recording device - Google Patents

Description

The present invention relates to a multi-mode magnetic recording device such as a floppy disk device having a plurality of modes such as recording capacities.

[Conventional technology]

In the conventional multi-mode magnetic recording device, a mode switching signal is sent from a higher-level device to be controlled. However, recently, a medium such as a high-capacity floppy disk is provided with a detection hole so that the recording capacity mode can be detected inside the magnetic recording device for the medium itself.

[Problems to be Solved by the Invention]

Since the above-mentioned internal detection has become possible, many specifications have become necessary in addition to the mode switching control from the conventional host device. They are listed below.

(1) The setting that receives the mode switching signal from the conventional host device and the setting by internal detection can be selected (2) The output of the internal detector can be sent to the host device (3) Mode switching from the host device When a signal is input, its logic can be inverted and selected (for example, whether H of logic specifies high capacity or low capacity) (4) Output logic of internal detector to upper device Inverted selection of mode relation The conventional control circuit can only partially meet the above demands, and the present invention satisfies the above demands, and it is easy to set them and easily form an IC. With the goal. In addition, in the case of making an IC, it is another object to reduce the number of input / output terminals as much as possible and to reduce the parts outside the IC.

[Means for solving the problem]

In order to solve the above problem, the mode switching signal from the host device and the output of the internal detector are both taken in in the control circuit of the multi-mode magnetic recording apparatus of the present invention. By incorporating both signals in the control circuit, the desired function can be realized easily and flexibly. One point of attention is that there is very little need to send the output of the internal detector to the host device when using the mode switching signal from the host device, and when using the output of the internal detector for mode switching Since the mode switching signal from the device is unnecessary, it can be shared by one logic inverting means. Further, while the positive and negative control signals are required for the switching signal inside the magnetic recording device by the selected mode switching method, the signals are integrated at the time of reading and writing.

[Work]

By using the control circuit of the multi-mode magnetic recording device configured as described above as an IC, it is possible to satisfy the above-mentioned required functions and simplify the circuit outside the IC. As a result, it becomes possible to cope with a higher-level device having various specifications by using a multi-mode magnetic device having the same specification only by changing the setting of the selection switch.

〔Example〕

The present invention will be described in detail below based on examples.
FIG. 2 is a control circuit diagram of a conventional multi-mode magnetic recording device. IC is shown in the dotted line, and mode switching signal ▲ ▼, detection output HDO of internal detector, selection signal ▲ ▼ to device, moving direction command ▲ ▼, moving command ▲ ▼, write command with host device ▲ ▼, are connected. The internal detector HD is a switch that opens when the detection hole on the medium is high-capacity and short-circuited, and the detection hole is closed and that is low-capacity and open. The ▲ ▼ signal is a switching signal for instructing high capacity when LOW and low capacity mode when HIGH. In FIG. 2, the jumper switching means 22 determines whether ▲ ▼ is selected or the HD switch is selected. The output of the HDO is sent to the upper device by the gates 24 and 23 when the selection signal ▲ is LOW. Further, the selected mode switching signal is input to the IC for use and is also output from the gate 27 to control the write current switching means (Iw) 29 and the time domain filter switching means (TDF) 30 required at the time of mode switching. . The above-mentioned FIG. 2 has the following problems.

(1) Switching of ▲ ▼ or HD switch is 2-contact switching, which complicates the switch and wiring pattern.

(2) The logic of ▲ ▼ cannot be inverted.

(3) The logic of the HD switch signal cannot be inverted with respect to the HDO output.

(4) The gate 28 which is an inverter is required outside.
Incorporating 28 into the IC increases the number of IC output pins. Further, the write current correction means (ΔIw) 32 and the switch filter (SWF) 33 are switched and controlled by the track position detection means 25 and the (inner circumference / outer circumference) determination circuit 26, but an extra inverter gate 31 is also provided here. In need.

Next, the control circuit diagram of the multi-mode magnetic recording apparatus according to the embodiment of the present invention shown in FIG. 1 will be described in detail. HD switch 1,
Switch (SEL) 2 for switching setting of ▲ ▼ and HD switch, switch (E) for switching logical inversion
X) 3, select gate 4, exclusive logic gates 5, 6, 9, 1
2, gates 7 and 8, track position detecting means 10, (inner circumference /
Perimeter) Judgment circuit 11, (Iw) 13, (TDF) 14, (△ Iw) 1
5 、 (SWF) 16. Track position detection means
10 is composed of an up / down counter,
Set up / down by ▼, count ▲ ▼ by clock input, and initialize by the signal (00) of the track 00 sensor. The intended function can be realized in the embodiment of FIG. 1 of the present invention. For selection of ▲ ▼ and HD switch, select gate 4 and switch 2 are set, and logic inversion of ▲ ▼ and logic inversion of HDO are very simple with a slight increase of IC input / output terminals by gates 5, 6 and switch 3. A circuit configuration outside the IC is realized.
As for the control of (Iw) and (TDF), and the control of (△ Iw) and (SWF), the control of (Iw) and (△ Iw) is required only at the time of writing, and when not writing = (TDF) at the time of reading. Taking advantage of the fact that the control of (SWF) and (SWF) is required, the external inverter can be omitted by sharing the signal which is inverted by the gates 9 and 10 by the signal.

〔The invention's effect〕

As described above, the multi-mode magnetic recording device of the present invention can be applied to many higher-level devices having different specifications, and the versatility can be greatly improved. As a result, it is not necessary to manufacture a multi-mode recording device according to each specification, and there is no problem even if different specifications occur on the computer side which is the host device. Further, the control circuit unit of the present invention is very easy to be integrated into an IC, the connection outside the IC is simplified, and the number of parts is also omitted, so that an inexpensive circuit board can be configured.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a multi-mode magnetic recording apparatus according to an embodiment of the present invention. FIG. 2 is a control circuit diagram of a conventional multi-mode magnetic recording apparatus. 1, 21 ...... Internal detector 2, 22 ...... Mode switching input or internal detector selection setting means 3 ...... Logic inversion setting means 4 ...... Selection gate 10, 25 ...... Track position detection means

Claims (4)

(57) [Claims] 1. A multi-mode magnetic recording device for recording and reproducing by switching a plurality of different modes, comprising a mode switching input inputted from a higher-level device and an internal detector for detecting mode information provided on a magnetic recording medium. A multi-mode magnetic recording apparatus having a logic selection circuit for selecting either the mode switching input or the output of the internal detector as an internal mode switching signal, and setting means for the logic selection circuit. . 2. A multimode magnetic recording apparatus according to claim 1, wherein the output of the internal detector and the mode switching input input from the host device are inverted by a single first logic inverting means. . 3. A multi-mode magnetic recording device for switching between a plurality of different modes for recording / reproducing, and a second logic for inverting the logic of an internal mode switching signal in the read state and the write state. A multi-mode magnetic recording device having an inverting means. 4. A multi-mode magnetic recording apparatus having track detecting means for detecting whether the track position is the inner circumference or the outer circumference by performing recording / reproducing by switching a plurality of different modes, and A multi-mode magnetic recording apparatus having a third logic inverting means for inverting the output of the track detecting means when in a write state.