JPS59107480A - Cassette type bubble memory device - Google Patents

Abstract

PURPOSE:To prevent the breakdown or errors of data due to an operation mistake by checking a temporary memory circuit before data reading/writing and performing the data reading/writing after reading the defective loop information if the temporary memory circuit is set at the resetting part. CONSTITUTION:The state of a temporary memory circuit 15 is checked before reading and writing data. If the circuit 15 is set at the resetting side (cassette type bubble memory device 10 replaced), the reading/writing of data is performed after reading the defective loop information out of the device 10 via defective loop readout circuit 11. While the reading/writing of data is carried out directly if the circuit 15 is set at the setting side (correct defective loop information is stored in a control circuit 13). Thus it is not needed to store again the defective loop information to the circuit 13 for each replacement of the memory 10. This prevents the breakdown or errors of data due to an operation mistake.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be used as a program memory for terminal equipment lobe, NC program loader, etc., or as a file memory such as auxiliary memo I/Kanji character generation pattern memory, image processing memory, etc. for small calculators. The present invention relates to a cassette-type bubble memory device suitable for use as a cassette-type bubble memory device.

Bubble memory devices create cylindrical magnetic domains (called bubbles) in a magnetic single crystal thin film by applying a bias magnetic field perpendicular to the film surface.
゛This is a memory device that corresponds to “0”. When a permalloy pattern is placed on the thin film and a magnetic field parallel to the film surface is applied, the permalloy pattern becomes magnetized and attracts or repels bubbles.

By rotating this parallel magnetic field, the positions of the magnetic poles of the permalloy pattern move sequentially, making it possible to transfer bubbles.

This rotating parallel magnetic field is generated by passing current through orthogonal coils. Normally, a permanent magnet is used for the bias magnetic field, so it can be used as a nonvolatile memory.

Now, as shown in Figure 1, a bubble memory device with a major line/minor loop configuration has a minor loop 1 for data storage, a read menoya line 2 for reading data, and a write menoya line for writing data. 3, a detector 4 for reading, and a bubble generator 5 for writing. A large number of minor loops 1 are arranged in parallel to major lines 2 and 3.

There are various methods for reading and writing data, but here we will explain a bubble memory device using the swap/replicate method (writing is performed by exchanging bubbles, and reading is performed by duplicating baffles).

In the case of reading, the bubbles at the upstream positions on each minor loop 1 are duplicated and transferred onto the reading major line 2 all at once. The original bubble remains on the minor loop 1 as it is. In the case of writing, the bubble on the major line 3 for writing and the Σ/〈〛full at the swap position on the minor loop are exchanged all at once.

Therefore, a data group is read and written by the operation of the bubble generators located at the same position in the parallel direction on each minor loop 1. This data group is called a page.

In order to treat the page as meaningful data, it is necessary to recognize where the page is located on the minor loop. Normally, as shown in Figure 2, an index mark page IP is created on each minor loop 1,
Based on that position, the pages are numbered counterclockwise (same as the direction of rotation of the bubble) as IP to (M-1)P.

Therefore, before reading or writing data to or from a baffle memory device, the index mark page IP is first written out and its location is stored in a control circuit that commands data reading and writing. Then, the bubble memory device is magnetically rotated based on the position of the set index mark page IP to read and write data.

By the way, in a bubble memory device with a major line/minor loop configuration, the yield of the bubble memory device decreases due to defects in the pattern on the minor roof. We are working to improve the yield of baffle memory devices. Therefore, when reading and writing data to and from a bubble memory device, it is necessary to efficiently avoid this defective loop. The present invention relates to a cassette-type bubble memory device using a cassette-type bubble memory device that stores this defective loop on its own device.

When reading or writing data to a cassette-type bubble memory device that stores defective loop information on its own device in this way, the defective loop information of the cassette-type bubble memory device is first read and transferred to another memory in the control circuit. It is necessary to store it on an element such as an IC memory. Therefore, the operator has had to execute this command whenever inserting a new cassette-type bubble memory device or replacing it. If you forget to execute this command, there is a risk that the currently inserted cassette bubble memory device will be processed into a bad loop and read/write correct data based on the previously stored bad loop information of the device. . Further, in order to prevent this, it is possible to read the defective loop information into the IC memory of the control circuit each time data is read or written, but the access time to the cassette type bubble memory device is significantly delayed.

In view of the above points, the present invention provides a cassette attachment determination circuit that determines whether or not a cassette bubble memory device is attached, and a temporary storage circuit that is reset when the cassette bubble memory device is not attached. The cassette is designed to prevent data destruction and errors due to operational errors by automatically storing defective loop information of the currently installed bubble memory device in the control circuit when the memory circuit is set. The present invention aims to provide a bubble memory device based on the formula.

Embodiments of a cassette-type bubble memory device according to the present invention will be described below with reference to the drawings.

As shown in Figure 3, the cassette type bubble memory device is
a cassette-type bubble memory device 10; a defective loop information reading circuit 11 for reading defective loop information of the bubble memory device 10; a control circuit 13 that internally stores the defective loop information via the defective loop information readout circuit 11 and instructs reading and writing of data; and the cassette-type bubble memory device 1.
A cassette attachment determination circuit 14 for determining whether a cassette 0 is attached or not, and a temporary storage circuit 15 composed of a flip-flop or the like are provided. Here, the cassette attachment determination circuit 14
is turned on when the cassette-type bubble memory device 10 is attached, and is turned off when not attached, and the temporary storage circuit 15 is configured so that the control circuit 13 reads out defective loop information from the defective loop information reading circuit 11 and stores it inside. When this happens, the cassette is set outside and re-centered when the cassette attachment determination circuit 14 outputs an off signal.

In the above configuration, before reading or writing data, the state of the temporary storage circuit 15 is checked, and if it is on the reset side (meaning that the cassette-type bubble memory device 10 has been replaced), the control circuit 13 The defective loop information is read from the cassette type bubble memory device 10 which is currently installed in the cassette-type bubble memory device 10 via the defective loop information reading circuit 11. Then perform normal data reading and writing. Further, if the temporary storage circuit 15 is on the set side (meaning that the control circuit 13 stores correct defective loop information), reading and writing of data is executed as is.

As explained above, according to the cassette-type full memory device of the present invention, when a new cassette-type bubble memory device is inserted or replaced, the temporary storage circuit is automatically reset, and the control circuit is therefore Before reading or writing, the faulty loop information in the device is read into the IC memory, etc. in the control circuit.The faulty loop information is stored in the control circuit each time the operator replaces the cassette-type bubble memory device. There is no need to execute a redo command, and there is no need to destroy data due to operational errors.
It is possible to try to prevent errors.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a general bubble memory device, FIG. 2 is an explanatory diagram thereof, and FIG. 3 is a block diagram showing an embodiment of a cassette type bubble memory device according to the present invention. 1... Minor loop, 2, 3... Major line, 4... Detector, 5... Bubble generator, 10...
Cassette type bubble memory device, 11... Defective loop information reading circuit, 12... Data reading/writing circuit, 13... Control circuit, 14... Cassette attachment determination circuit, 15... Temporary storage circuit. Patent applicant Tokyo Denki Kagaku Kogyo Co., Ltd. Representative Patent attorney Takashi Murai Figure 1 Figure 2

Claims (1)

[Claims] (1) a cassette-type bubble memory device, a defective loop information reading circuit that reads defective loop information of the bubble memory device, and a data read/write circuit that reads data from the bubble memory device and writes data to the bubble memory device; A cassette-type bubble memory device comprising a control circuit for internally storing the defective loop information via the defective loop information reading circuit, a cassette attachment determination circuit for determining whether or not the bubble memory device is attached, and a control circuit for determining whether the bubble memory device is attached. a temporary storage circuit that is set when the circuit internally stores the defective loop information via the defective loop information reading circuit, and is reset when the cassette attachment determination circuit detects that the bubble memory device is not attached; 2. A cassette type bubble memory device, wherein the control circuit reads and re-stores defective loop information of the attached bubble memory device when the temporary storage circuit is in a reset state.