JPS6030871Y2 - magnetic bubble storage device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improving the reliability of magnetic bubble memory.

Some types of devices that record and detect binary digital information as needed, such as magnetic tape devices, read the information immediately after it is written to check whether the information was written correctly or not. Inspecting and making corrections as necessary, so-called read after write, is generally performed.

On the other hand, in storage devices that utilize magnetic bubbles, such reading after writing has not been performed in the past.

This is done to ensure the required reliability, since writing errors increase with increasing recording density and writing speed in magnetic tape devices. was not implemented because the writing reliability was considered to be sufficiently high.

However, in recent years, even in magnetic bubble devices, patterns have become finer and higher integration has progressed, and while writing devices are required to be simplified, for example, equipment mounted on aircraft.

The reliability of writing itself has also been reconsidered, as it has become a reality to use it in areas that require high reliability even if it means sacrificing some cost.

FIG. 1 schematically shows a conventionally known major loop/minor loop type magnetic bubble memory.

The information written in the major loop 1 by the write gate 3, that is, the magnetic bubble, is sequentially transferred through the major loop 1, and when it reaches a predetermined position, it is transferred to the transfer device 6.
is transferred to minor loop 2.

The information transferred to the minor loop is stored while being transferred within the same loop, and is returned to the major loop 1 as needed and read out by the detector 5.

Furthermore, an erase gate 4 is provided for erasing old information before writing new information.

In this configuration, when attempting to read after writing, the written information goes around the major loop and then is read out by the detector 5, confirming that it was written correctly. After that, the major loop 1 is transferred again and then transferred to the minor loop 2, and the writing speed is halved.

The present invention proposes a magnetic bubble storage device that enables reading after writing without causing such a decrease in performance.

FIG. 2 shows a first embodiment of the present invention. In this embodiment, the detector 5 and the write gate 3 are arranged in this order in the bubble transfer direction, as in the prior art. Furthermore, a side path 13 is provided which connects a branch point 12 immediately after the write gate 3 to a confluence point 11 immediately before the detector 5.

In this embodiment, the written information is divided into two parts at the branch point 12, one part is directly transferred through the major loop 1, and the other part passes through the side path 13 and passes through the confluence point 11 to the detector 5. reach.

Here, it is determined whether the writing is correct or incorrect.

Erasure gates 4 are provided at two locations to erase old information remaining in the major loop 1 and monitored information.

Furthermore, when the written information reaches the position where it is transferred to the minor loop 2, the determination of whether the last bit of the information is correct or incorrect must be completed, so the length of the side path 13 is limited.

FIG. 3 shows a second embodiment, in which a write gate 3 and a detector 5 are provided at the end of a branch line drawn out from the measure loop 1, and a side path 13 is provided between the compatible lines. .

The information written by the write gate 3 is divided into two parts at the branch point 12', one of which passes through the branch point 12 and enters the major loop 1, and the other part passes through the side path 13 and enters the confluence point 11'. Then it reaches the detector 5.

Figures 4 and 5 are folded versions of the first and second embodiments.
The third and fourth embodiments shown in the figure.

The operations of these two embodiments can be easily understood from the operations of the first and second embodiments.

In the second and third embodiments, only one erase gate is required, but in the fourth embodiment, two erase gates are provided for the same reason as in the first embodiment. This is desirable.

As explained above, the technology of the present invention shows the greatest effect in major/minor type magnetic bubble storage devices, but it can also be applied to other types, such as half-loop configuration type magnetic bubble storage devices. A similar effect can be obtained by using the erroneous writing correction device.

The technology of the present invention directly has the effect of reducing errors in the writing system, including the line system, but indirectly, by checking the frequency of occurrence of rewriting, it reduces errors in the writing system, including the detection system. It also has the effect of monitoring the operation of the entire device.

[Brief explanation of the drawing]

Figure 1 shows the configuration of a conventional magnetic bubble memory, Figure 2 shows the configuration of a conventional magnetic bubble memory.
5 is a diagram showing the device of the present invention, in which 1 is a major loop, 2 is a minor loop, 3 is a write gate, 4 is an erase gate, 5 is a detector, 6 is a transfer gate,
11.11' is a confluence point, 12.12' is a branch point, and 13 is a side road.

Claims (1)

[Scope of utility model registration request] A detector and a write gate are provided in this order at a predetermined position of the magnetic bubble transfer path in the transfer direction of the magnetic bubble in the transfer path, and the bubble is directly connected from the output side of the write gate to the input side of the detector. A magnetic bubble storage device characterized by having a side path for transferring.