JPS61211894A - magnetic bubble memory device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic bubble memory device, and particularly to a cassette-type magnetic bubble memory device suitable for protecting stored contents in a write-protected state.

[Background of the invention]

The cassette-type magnetic bubble memory device can read and write information as shown in the block diagram in Figure 1.

At least one magnetic bubble memory device (
A magnetic bubble memory cassette (hereinafter referred to as a cassette) consisting of a signal detection circuit (hereinafter referred to as SA) 2 for detecting the read information (hereinafter referred to as MBM) 1 and the read information thereof.
3 and a rotating magnetic field coil drive circuit (hereinafter referred to as "CD") for writing or reading information on the MBMl.
4, a function current drive circuit (read gate 5m that supplies information read current to MBM1) and a write gate 5b that supplies write current (
(hereinafter referred to as FD)5. A function timing generation circuit (which controls the timing current of CD4 and FD5)
(hereinafter referred to as FTG)6. Data collector formatter (hereinafter referred to as DCF) that controls various data systems
7. Magnetic bubble memory control circuit (hereinafter referred to as BMC) 8 that controls write and read operations of MBMl
and a magnetic bubble memory adapter (
(hereinafter referred to as an adapter) 10.

In the cassette-type magnetic bubble memory device constructed in this manner, the cassette 3 and the adapter 10 are electrically connected via a connector (not shown), and are configured to be easily attachable and detachable by inserting the cassette 3 into a plate. Therefore, the user can use a plurality of types of cassettes 3 with one adapter 10.

In addition, in the cassette-type magnetic bubble memory device configured as described above, the FD mounted on the adapter 10 is used to prevent the storage contents in the MBM1 from being destroyed due to malfunction or the like.
A switch is provided in the write gate drive circuit in S, and when information is set to be prohibited from being written by this switch, the structure is such that no current flows to the write gate (
Utility Model Publication No. 58-12795).

However, with such a configuration, the write inhibit detection circuit 9 is required and the cassette 3. There was a problem that the circuit such as the adapter 10 and the connector for electrically connecting the two becomes complicated. Further, if the BMC 8 does not operate normally due to an abnormality in the power supply voltage for some reason, there is a problem in that the information stored in MB to 11 in the cassette 3 is changed.

[Purpose of the invention]

One object of the present invention is to provide a magnetic bubble memory device in which information writing prohibition means can be implemented with a simple configuration.

Another object of the present invention is to provide a magnetic bubble memory device that can reliably protect MBM storage information in a cassette even when the BMC malfunctions.

[Summary of the invention]

According to one embodiment of the present invention, a switch is provided in the swap gate circuit in the cassette, and this switch performs an operation to inhibit writing to the cassette, and when the switch is opened, current flows through the swap gate in any case. A magnetic bubble memory device is provided.

[Embodiments of the invention]

FIG. 2 is a block diagram of essential parts showing an embodiment of the magnetic bubble memory device according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In the figure, the first write gate 5bl of the FD5 provided in the adapter 10,
A switch 11 is connected between the MBMl swap gate circuit 1a provided in the cassette 3 and turns on and off a write inhibit signal. In this case, the switch 11 is arranged inside the cassette 3 and can be turned on and off from the outside. Note that 1b is a magnetic bubble generation circuit, 1c is a minor loop that stores information, and 1b
16 is a replicate gate circuit connected to the first read gate 5a1 of the FD5, and 16 is a magnetic puzzle detection circuit connected to the second read gate 5m2 of the FD5.

In the table configuration as shown above, if the switch 11 is provided in the swap gate circuit 1a, the write prohibition command is as follows.
By turning off this switch 11 and opening the swap gate circuit 11, the drive current of the swap gate circuit 1a may be cut off.

FIG. 3 is a plan view showing an embodiment of the cassette 3 according to the present invention, and the same parts as in the previous figures are given the same reference numerals. In the figure, a recess is provided on the side surface of the case 3' constituting the cassette 3, and in this recess, a first writing gate is inserted into the contact terminal, respectively.
A toggle switch 11 to which an MBMl swap gate circuit 1 is connected is housed inside. In this case, the knob of the toggle switch 11 is disposed within the recess. In addition, 12 is an adapter 10 (not shown).
This connector is attached to the connector on the side (see Figure 2).

According to such a configuration, by tilting the knob of the toggle switch 11 in the direction of arrow A, the swap gate circuit 1a can be opened.
is turned on, and MBML becomes ready for writing.
Also, by tilting the knob in the direction of arrow B, one swap gate circuit can be turned off and a write-inhibited state can be achieved.

FIG. 4 is a plan view showing a main part of another embodiment of the cassette 3 according to the present invention, and the same parts as those in the previous figures are given the same reference numerals. In this figure, the difference from Figure 3 is as follows.
On the side of the case of the cassette 3, there is a push button switch 1 consisting of a 1° intrusion prevention detection element 12 of the optical system and a light shielding plate 13.
4 is tucked inside. In this case, the write inhibit detection element 12 of the optical system is composed of a combination of an infrared light emitting diode 12a and a phototransistor 12b, as shown in FIG.

According to such a configuration, when the light shielding plate 13 of the push button switch 14 is in the direction of arrow C, that is, in the state shown in FIG. Since the light is received by the transistor 12b and optically connected, the write gate 5b1 and the swap gate circuit 1a are electrically connected, the swap gate circuit 1a is turned on, and the MBMl is in a writable state.

In addition, when the light shielding plate 13 of the push button switch 14 is pushed in the direction of the arrow and the state shown in FIG.
Since the light is blocked and the phototransistor 12b no longer receives light, the writing process)5b+ and the swapping process)・
The circuit 1a is cut off, the swap gate circuit 1a is turned off, and the MBMI is placed in a write-inhibited state.

In addition, in the above-mentioned embodiment, 5b
switch 11.1 between + and swap gate circuit 1a
Although the present invention is not limited to this, as shown in FIG. 8, the switch 11 and An equivalent switch 15 may be provided, and both switches 11 and 15 may be used together, or the switch 1
5 to turn off the magnetic bubble generation circuit 1b,
MBMi can be made write-protected.

〔Effect of the invention〕

As explained above, according to the embodiment of the present invention, the write inhibit command is executed using physical means that opens the swap gate circuit within the cassette, thereby ensuring that the information in the cassette is protected. Therefore, the reliability of the cassette can be improved. Moreover, according to such a configuration, it is possible to attach and use adapters of different types, so that versatility can be expanded. Furthermore, the cassette can be protected even if the write-inhibiting circuit inside the adapter breaks down. In addition, extremely excellent effects such as being able to perform write-inhibiting measures on the cassette itself can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional magnetic bubble memory device, FIG. 2 is a block diagram showing an embodiment of the magnetic bubble memory device according to the present invention, and FIGS. 3 and 4 are specific examples of the present invention. FIG. 5 is a diagram illustrating the write inhibit element, FIGS. 6 and 7 are diagrams illustrating the operation of the push button switch, and FIG. 8 is another embodiment of the present invention. FIG. 2 is a block diagram showing main parts. 1-- Magnetic bubble memory device (MBM), 1a
...Swap gate circuit, 1b...Magnetic bubble generation circuit, 1c...Minor lube, 1d-φ...
Magnetic bubble detector, 1e... Replicate gate circuit, 2...-signal detection circuit, 311... Magnetic bubble memory cassette (cassette), 3'... Case,
4...Rotating magnetic field coil drive circuit (CD), 5...
・Function current drive circuit (FD), 5a...
-Reading gate, 5al...first readout gate, 5a2...second readout gate, 5b...
・Write gate, 5bl・φ...First write gate, 5bz...φ Second write gate, 6...-φ
Function timing generation circuit (FTG), 7.
---Data Collector Formatsuta (DCF), 8...
...Magnetic bubble memory control circuit (BMC), 9...
write-protection detection circuit, 10... magnetic bubble memory adapter (adapter), 11-... switch, 12...
...Writing protection detection element, 12M...Infrared light emitting diode, 12b...Phototransistor, 1
3...Fist/light shielding plate, 14...Push button switch, 15
・－・Fist. switch.

Claims (1)

[Claims] a magnetic bubble memory cassette having at least a magnetic bubble memory device; and a magnetic bubble memory adapter having at least a function current drive circuit for outputting various functional currents for reading and writing magnetic bubbles in the magnetic bubble memory device; A magnetic bubble memory device characterized in that a swap current circuit in a cassette is provided with a switch for setting a write-inhibited state.