JPH0232712B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic bubble memory control device equipped with a control circuit for a bubble memory device.

Bubble memory devices have excellent features such as the storage information being non-volatile and easy to rewrite, the solid state element with no mechanically moving parts making it highly reliable, and the ability to be mounted on printed circuit boards due to its small size and high density. The field of its use is rapidly expanding along with the Protupid disk and Protupidisk. In particular, demand is rapidly increasing for use as file memory and program loaders for NC devices, robots, production control terminals, POS terminals, OA equipment, and various terminals.

Such a bubble memory device can only be used in combination with a magnetic bubble memory control device equipped with a bubble control circuit.

[Conventional technology]

Bubble memory devices are housed in a shield case made of soft magnetic metal, and contain a bubble memory chip, a bias magnet, a magnetic field shunt plate, an X/Y drive coil that generates a rotating magnetic field for driving bubbles, and information stored in the bubble chip depending on the type of use. It is well known that the structure includes an erase coil and the like that erases all information stored in the memory.

The bubble control circuit also includes a direct peripheral circuit (also called a linear circuit) that directly operates and controls the device using analog signals, and a TTL (transistor) direct peripheral circuit that operates and controls the device in accordance with information write/read instructions from the host system. It is also well known that the device includes at least indirect peripheral circuits controlled by digital signals at the transistor logic level.

These direct peripheral circuits include a coil driver circuit that operates and controls the bubble memory device by supplying a predetermined current, or analog signal, to the drive coil and memory chip, a function driver circuit, and a number of detectors in the bubble memory chip.
It includes a sense amplifier circuit that amplifies the mmV sense output voltage and converts it to a TTL level.

In addition, the indirect peripheral circuit indirectly controls the operation of the bubble memory device by inputting various control digital signals to the direct peripheral circuit according to information write/read commands from the host system, and also directly controls the operation of the bubble memory device (sense amplifier circuit). ) is configured to output a digital sense signal from the host system to the host system.

The magnetic bubble memory control device is used in two types: a memory card system configuration and a cassette memory system configuration.

The former is a configuration in which a bubble memory device and its control circuit are mounted on a printed circuit board to form a memory card, and this is provided inside the host system or in a dedicated casing.

The latter is a configuration in which a cassette memory containing a bubble memory device housed in a case is provided with the control circuit in the host system or in a dedicated housing, and the cassette memory is attached to and removed from the control circuit.

Incidentally, some cassette memories have a structure in which directly peripheral circuits such as a send amplifier circuit are built-in.

By the way, the conventional magnetic bubble memory control device is
3 of +5V and ±12V required in bubble control circuit
Because the device is configured to supply a power source or a stabilized +5V single power source from outside the device, it has not been possible to make it a portable device that can be carried anywhere by the operator and used in any location.

Furthermore, the conventional magnetic bubble memory control device interfaces with the host system using an 8-bit parallel bus signal, which has the disadvantage of increasing the number of control lines.

[Problem that the invention seeks to solve]

The present invention is to construct the above-mentioned conventional magnetic bubble memory control device as a portable device so that an operator can easily carry it and use it anywhere, and can obtain a highly reliable bubble output signal.

[Means for solving problems]

In order to solve the above conventional drawbacks, the present invention provides a direct peripheral circuit including an interface circuit, an indirect peripheral circuit, a sense amplifier circuit, and a bubble memory device inside an upper case and a lower case made of a resin molded body having a concave cross section. A printed circuit board with a bubble control circuit mounted with a connector to which a cassette memory housed in a case is mounted, and a group of circuits constituting a DC/DC conversion circuit are mounted, and a voltage of a predetermined value generated by the circuit is mounted. A printed board with a power control circuit mounted thereon that supplies power to the printed board, and a dry battery housed in a battery box provided in the lower case are built in, and the upper case has an outer side surface at a corner of its rectangular surface. A stepped surface for installing the cassette memory is formed with an open surface, a cover for covering the cassette memory is removably attached to the stepped surface, and an opening is formed in one upper side surface of the stepped surface. The power supply control circuit mounting printed board is installed in the lower case, the bubble control circuit mounting printed board is installed in the upper case so that the connector corresponds to the opening, and the upper and lower cases are installed in the two cases. To provide a magnetic bubble memory control device, wherein the printed boards overlap each other except for at least the sense amplifier circuit of the direct peripheral circuit, and the sense amplifier circuit is arranged to be shifted from the printer board.

[Effect]

The magnetic bubble memory control device of the present invention is configured as a portable device in which a printed board with a power supply control circuit is mounted in addition to a printed board with a bubble control circuit mounted therein, and when the printed board is mounted, a sense amplifier circuit is installed. Since it is arranged so as not to be affected by noise, a highly reliable bubble output signal can be obtained.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a magnetic bubble memory control device having a bubble memory system configuration will be described with reference to the drawings.

FIG. 1 is a circuit block diagram of a magnetic bubble memory control device according to the present invention, FIG. 2 is a system configuration diagram using the memory control device of FIG. 1, and FIG. 3 is a specific structure of the memory control device of FIG. 1. Perspective view showing 4th
The figure shows the memory control device according to the present invention in a fully assembled state, where FIG. 4A is a plan view seen from the front side;
B is a plan view seen from the back side, and figures C, D, E, and F are side views seen in the direction of arrows c, d, e, and f in figure A. FIG. 5 is a perspective view showing the memory control device according to the present invention with a cassette memory installed.

As shown in FIG. 1, this magnetic bubble memory control device 80 includes an interface circuit 1, an indirect peripheral circuit 1,
0, direct peripheral circuit 20, DC/DC conversion circuit (DC/DC converter) 30, dry battery 40, connector 50 to which the cassette memory 60 is connected, power switch 51, power switch plug to which the dry battery 40 or AC adapter cable 52 is connected. 53,
The connector 54 to which the host system 70 connects is
It is installed in one housing.

The interface circuit 1 is a circuit for connecting this memory control device to the host system 70, and is formed by a CPU 2 that performs signal processing, a ROM 3 that stores data management software, and a RAM 4 that temporarily stores signals. Then, the CPU 2 converts the serial control signals from the host system 70 into 8-bit parallel bus signals, temporarily stores them in the RAM 4, and reads out the control signals in the order in which they are stored in the ROM 3.
The contents of the control signal are interpreted by data management software in the controller, and the signal is input to the indirect peripheral circuit 10.

In order to write data to the bubble memory device, the indirect peripheral circuit converts it into a serial signal again and drives the direct peripheral circuit 20 while taking the timing, and also converts the serial output signal from the sense amplifier of the direct peripheral circuit into a parallel signal. and supplies it to the interface circuit 1.

Direct peripheral circuitry is connected to bubble memory device 61 in cassette memory 60 via connectors 50 and 62.
A write current, a read current, a division current, a flip current, etc. are applied to the device 61 to drive the function gate, and data is written to or read from the device 61.

The DC/DC converter circuit 30 is supplied with a 6V DC voltage from a dry cell battery 40 and connects it to the + of the interface circuit 1.
This circuit generates and supplies 5V power, ±5V and ±12V power required by the direct peripheral circuit 10 and indirect peripheral circuit 20. In addition to the dry battery 40, the cable 5 is used as a power source for the DC/DC conversion circuit 30.
2 into the plug 53, the dry battery 40 is disconnected and power can be supplied with AC/DC converted current.

This bubble memory control device 80 is configured to reduce the power consumption of the power source so that it can be powered by the dry battery 40.

In other words, when bubble memory is used as an external storage device, the power consumption during standby (the state in which the power is turned on but the bubble memory device is not operating or being controlled) is high even though the frequency of use is usually quite low. There is a big drawback.

Therefore, in this bubble memory control device 80, the CPU 2 of the interface circuit 1 is connected to the host system 70.
When the control signal is interpreted as a signal for operating the bubble memory, a power-on signal (Power ON) is output to the DC/DC conversion circuit 30. While the DC/DC conversion circuit 30 is receiving the power-on signal, the direct and indirect peripheral circuits 10,
A predetermined power is supplied to 20, but when the input of the power-on signal disappears, the power is automatically turned off (Power OFF) and the power supply to the direct and indirect peripheral circuits 110 and 20 is stopped. . This makes it possible to reduce power consumption during standby.

Note that the DC/DC conversion circuit 30 always supplies +5V voltage so that the interface circuit 1 can detect the signal from the host system 70. Also, the circuit 30
When the power supply falls below a certain level, it outputs a low battery signal (Low Battiery) to the interface circuit 1, and in response to this, the CPU 2 causes the display of the host system 70 to display a message to that effect. If the power supply further decreases, the circuit 30 outputs a reset signal (Reset) to the indirect peripheral circuit 10 to stop its function and stop the bubble memory operation.

FIG. 2 shows an example of the use of the present magnetic bubble memory control device, in which the host system 70 is a small and portable document creation device (Japanese word processor), with a display 71, a keyboard (not shown), and a printer. We are prepared. 80 controls the cassette memory 60 using control signals (signals for document transmission/reception/deletion, dictionary transmission/reception/deletion, character pattern transmission/reception/deletion, etc.) from the document creation device 70, and controls data writing/reading. In this magnetic bubble memory control device, 86 is a cover, and 95 is a connection cable.

In this system, a bubble memory is used as an external storage device, and the bubble memory control device 80 is equipped with a dry cell and various power sources required for the direct and indirect peripheral circuits from the dry cell battery, in addition to the direct and indirect peripheral circuits as described above. It has a built-in DC/DC converter circuit that generates a high voltage, making it a portable device.

In this system, control signals and actual data from the document creation device 70 are input to a bubble memory control device 80 through a cable 95, and the device 80 manages data based on the control signals from the document creation device 70 and uses the control signals. Based on the data, the bubble memory device is operated and controlled, and data is written and read in correspondence to the document storage area, dictionary storage area, and character pattern storage area of the device.

Next, the specific structure of the present magnetic bubble memory control device will be explained with reference to FIGS. 3 to 5.

As shown in FIG. 3, this memory control device 80 has an upper case 81 and a lower case 82 made of a resin molded body with a concave cross section.
It has a structure in which a dry battery 40 is built in and a cassette memory 60 is connected.

The corner of the rectangular surface of the upper case 81 forms a stepped surface 85 with an open outer side surface, and a cover 86 is removably attached to cover the stepped surface 85. In addition, an opening 8 is formed on one upper side surface of the stepped surface 85.
7 is a protrusion 89 having a hole 88 on the other upper side.
is formed. Further, the cover 86 is formed with a protrusion 90 for operating a lid installation confirmation switch as shown in FIG.

The lower case 82 includes a battery box 91 and a lid 92 for housing the battery 40 from below. Further, a power switch 51 and a power switching plug 53 are attached to the side wall as shown in FIG.

An interface circuit 1, an indirect peripheral circuit 10, and a direct peripheral circuit 20 are mounted on the bubble control circuit mounting printed board 83, and a cassette memory 60 is also mounted.
Connector 93 connected to lid installation confirmation switch 9
4 is mounted, and a connection cable 95 to the host system 70 is led out.

Further, in the circuit mounting configuration of the printed board 83, the circuit group 96 realizes the interface circuit 1 and the indirect peripheral circuit 10, and the circuit group 97 realizes the direct peripheral circuit 20. At this time, since the direct peripheral circuit 20 includes a sense amplifier 98 to which only a few mmV of sense voltage can be applied from the bubble memory device, the sense amplifier 98 is separated from the power supply control circuit mounted printed board 84 in this printed board 83. As such, it is located above the battery box 91, making it less susceptible to noise.

A group of circuits constituting the DC/DC conversion circuit 30 is mounted on the power supply control circuit mounting printed board 84 , and a voltage of a predetermined value generated by the circuit is transmitted to the bubble control circuit mounting printed board 83 via the connector 99 .
supplied to

Then, the printed board 83 is attached to the inside of the upper case 81 so that the connector 93 corresponds to the opening 87, the printed board 84 is fixed to the inside of the lower case 82, and the dry battery 40 is housed in the battery box 91. , the present magnetic bubble memory control device 80 shown in FIG. 4 is constructed.

Further, the cassette memory 60 is inserted into the device 80 so that the connectors 62 and 93 are connected to each other.
Cover 86 is installed so that protrusion 90 operates switch 94 through hole 88. If the cassette memory 60 is incompletely inserted, the cover 86 will collide with it and cannot be closed, making it impossible to operate the switch 94. That is, the cover 86
Switch 94 is installed only when it is fully installed.
is activated, thereby making it possible to drive the cassette memory 60.

Further, in the present device 80, the cassette memory 60 is guided by the stepped surface 85 and the side surface of the protruding portion 89, and is connected to the connector. At this time, in order to facilitate the insertion/extraction operation, the protrusion 89 is provided with the cassette memory 6.
It gives a space of 100 for the finger that grabs 0,
In addition, since the stepped surface 85 is formed using the corner of the case and the outer side surface is open, fingers and hands do not hit the case during insertion, and the cassette memory is easy to grasp when removed.

〔Effect of the invention〕

According to the present invention described above, the magnetic bubble memory control device can be made into a portable device, and the influence of noise on weak bubble output signals can be reduced. In addition, a printed board with a bubble control circuit for controlling the cassette memory is attached to the upper case together with the cassette memory, and a printed board with a power supply control circuit is attached to the lower case along with the battery. It is easier to assemble than accommodating such parts, and the overall shape can be made smaller and more compact by stacking printed boards, batteries, and cassette memories. Furthermore, since the cassette memory is mounted at the corner of the upper case, the operator can easily insert and remove the cassette memory.

As described above, by using the present invention, it is possible to further expand the field of use of bubble memory, and its practical effects are significant.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of a magnetic bubble memory control device according to the present invention, FIG. 2 is a system configuration diagram using the memory control device of FIG. 1, and FIG. 3 is a specific structure of the memory control device of FIG. 1. Perspective view showing 4th
The figure shows the memory control device according to the present invention in a fully assembled state, where FIG. 4A is a plan view seen from the front side;
B is a plan view seen from the back side, and figures C, D, E, and F are side views seen in the direction of arrows c, d, e, and f in figure A. FIG. 5 is a perspective view showing the memory control device according to the present invention with a cassette memory installed. [Explanation of symbols], 1...interface circuit,
10...Direct peripheral circuit, 20...Indirect peripheral circuit,
30...DC/DC conversion circuit, 40...Dry battery,
60...Cassette memory, 70...Host system, 80...Magnetic bubble memory control device, 83...
... Bubble control circuit mounted printed board, 84... Power supply control circuit mounted printed board.

Claims (1)

[Claims] 1. Inside the upper case 81 and lower case 82, which are made of resin molded bodies with a concave cross section, are an interface circuit 1, an indirect peripheral circuit 10, a direct peripheral circuit 20 including a sense amplifier circuit, and a bubble memory. A bubble control circuit mounting printed board 83 is mounted with a connector 93 to which a cassette memory 60 with a device housed in a case is mounted, and a circuit group constituting the DC/DC conversion circuit 30 is mounted. a power supply control circuit mounting printed board 84 that supplies a predetermined voltage to the printed board 83; and a battery box 91 provided in the lower case 82.
A dry battery 40 is housed inside the upper case 81, and the upper case 81 has a rectangular surface with a
A step surface 85 for installing the cassette memory 60 is formed with an open outer side surface, and a cover 86 covering the cassette memory 60 is removably attached to the step surface 85. An opening 87 is formed in the upper side surface, the printed board 84 is installed in the lower case 82 and the printed board 83 is installed in the upper case 81 so that the connector 93 corresponds to the opening 87, In addition, the printed boards 83 and 84 of the upper and lower cases 81 and 82 overlap each other except for at least the sense amplifier circuit of the direct peripheral circuit 20, and the sense amplifier circuit overlaps the printer board 8.
4. A magnetic bubble memory control device characterized in that the magnetic bubble memory control device is arranged so as to be positioned at a position shifted from 4.