JPS59112481A - Magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To protect a data from disappearing by storing the same data in a specified page set on a work page, as well. CONSTITUTION:In case when a data of a minor loop 3, for instance, of a write page area 9 is a data to be protected from disappearing, a specified page of a page area 7, etc. is set on a work page, and the same data as that of the area 9 is written temporarily and stored in the area 7, as well. Accordingly, it is executed exactly to protect the data from disappearing, and a magnetic bubble memory device having high reliability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a magnetic memory device using a cylindrical domain controlled memory medium.

(b) Technical Background This type of memory medium is non-volatile for stored information;
It is in wide demand as a program storage and mini-file storage medium because it has many features not found in conventional media, such as small size, light weight, and low power consumption.

The present invention particularly relates to a memory device having a magnetic circuit configuration for bubble transfer using the major/minor loop method (also referred to as a transfer method). This paper presents a comprehensive measure to protect the

(C) Problems of the Prior Art The attached figure is a diagram showing the operating principle of a device circuit for writing data in or reading data written in a transfer type bubble memory device.

In the figure, 1 is a major loop on the read side that forms a bubble transfer path, 2 is a major loop on the write side that forms a bubble transfer path, and 3
is a minor loop forming a circulation path without a starting point or ending point; a large number of minor loops are arranged in parallel between each of the major loops 1 and 2 described above. 4 and 5 are transfer gates located at the magnetic coupling portion between the minor loop and the major loop arranged in parallel; 6 is a bubble detector; and 8 is a bubble generator.

The data readout of the illustrated bubble device circuit is on the dashed line 7 written in the loop 3 arranged in parallel (○ in the figure).
By transferring the bubble (a series of bit strings indicated by ) to the transfer gate 4 position along the directional arrow and opening the gate here, the bubble is transferred out to the subsequent measuring loop 11 and the stored data is read out by the detector 6. be done.

Next, data writing is performed by transferring bubbles from the write-side major lube 2, which forms a bubble transfer path with the bubble generator 8, to each of the minor lubes 3 arranged in parallel via the transfer gate 5.

However, in general, when writing data, the reading side once transfers out the bubble to erase the previous data, and then transfers new data to a position on the same loop where the data was erased.

Furthermore, regarding the data format of the page structure at the time of data writing (or reading), a series of bit strings indicated by the dashed-dotted line 7 (or dashed-dotted line 9) constitutes one page, and within this unit page, for example, 32-byte data write recording area 10.1-byte CI? CC area 1
1. and 5-byte marker and gap forming area 12
The data will be recorded.

By the way, if the power is turned off or the cassette is ejected during the write operation to the data area 10,
Since the previously written data area corresponding to 1/2 of each minor loop has been transferred out, the data corresponding to position 2, for example, the dashed line 9, cannot be reproduced, which is extremely inconvenient.

(d) Purpose of the invention An object of the present invention is to eliminate the above-mentioned disadvantages.

That is, in the event of a power outage or the like, the reliability of device operation is improved by protecting data recorded in the data area, especially data that should be protected against loss.

(e) Structure of the Invention The above object is a memory device having a major/minor lube type bubble storage circuit.

A specific page in the memory device is set as a work page, and when data is written, the same data is recorded in the work page to cope with loss of stored data.

(f) Examples of the invention An embodiment of the present invention will be described in detail below.

Each minor lube is called in a circular manner (loop 3 in the diagram is 2
If the data written at any position on the 73 lines (there are 73 lines), for example, the recorded data on the dashed-dotted line 9, is the specified data that should be protected against loss, then the same data as the written data is stored in the work page area, for example. Write on the dashed dotted line 7 provided as .

That is, an arbitrary page is provided as a data area (work page) for job work related to the device, and is used as a primary storage area until a given job is completed.

The number of pages provided for this purpose may be determined by setting a certain page area corresponding to the amount of data that will be lost when the power is turned off.

A newly created work page is provided with a 5-byte marker determined from the data format forming the page structure and a page code for identifying the work page or calling the work page in the gap forming area 12.

In the above description, the work pages are set in the same memory device (memory chip), but the work pages need not be set within the data area of the bubble storage. For example, it is possible to allocate an external memory of an appropriate capacity made of CMO3 (thin film circuit) to the bubble control peripheral circuit.

By using such a means to write data to a predetermined page and also record the same data on a work page, it is possible to protect against data loss.

(g) Effects of the Invention According to the magnetic bubble memory device of the present invention, which has been explained in detail above, even if the stored data is lost in an unintended situation such as a power cut, the data is retained in the setting work page. This has advantages such as increased device reliability.

[Brief explanation of drawings]

The figure is a diagram showing the operating principle of a transfer type bubble memory device circuit. In the figure, 1 is a continuous-side major loop, 2 is a write-side major loop, 3 is a minor loop, 6 is a bubble detector, 8 is a bubble generator, and 7 and 9 are page areas for data writing.

Claims (1)

[Claims] In a memory device equipped with a major/minor lube type bubble storage circuit, a specific page in the memory device is set as a work page. A magnetic bubble memory device characterized in that when data is written, the same data is also recorded in the set work page to protect stored data from being lost.