JPS592108B2 - magnetic bubble memory device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a major-minor loop type magnetic bubble memory device using half disks.

As shown in FIG. 1, a major-minor loop type bubble memory using a half-disk has a major-loop propagation path 1 composed of a large number of half-disk propagation patterns 11.
It has a structure in which a plurality of minor loops 2, 3, 4, etc. are arranged along the same half-disk propagation pattern.

The bubble propagates in a propagation pattern 1 during one rotation of the rotational driving magnetic field.
One 1 is moved, so one propagation pattern constitutes one bit. Transfer gates 12, 13, 14, . . . are arranged along the major loop 1 at 2-bit intervals as shown in the figure.
are arranged, and the minor loops 2, 3, . . . are connected to these gates via propagation paths 21, 22, 23, . As shown, each gate consists of a pickaxe-shaped pattern IT and a conductor 18 shown by dotted lines. 10 is a bubble generator, which generates bubble B according to the information, and major loop 1
send to.

On the opposite side of the minor loops 2, 3, . . . from the major loop 1 is a loop 30 similar to the major loop 1, which is the loop that guides the bubbles to the detector. This is gate 31 inserted into minor loops 2, 3...
32... via propagation paths 41, 42... Gates 31, 32... Pickaxe-shaped pattern 31
and a conductor 38 shown by a dotted line. The operation is as known, when the bubble generator 10 generates a bubble B, the bubble moves one by one through the major loop propagation pattern 11 for each revolution of the driving magnetic field, and when it comes to the gate 12 it moves through the conductor wire. When a current is passed through 14, the propagation path is switched to the propagation path 21, and the minor loop 2 is entered.

After that, the circuit circulates within this minor loop 2, and the bubble generator 10 generates bubbles one after another according to the input information.
If the gate 12 is opened, subsequent bubbles are similarly input to the minor loop 2, and the input information is thus stored. The same applies to loops 3, 4, etc. To read stored information, gates 31, 32,
··open. At this time, for example, when the bubble propagating in the direction of the arrow in the loop 2 reaches the gate 31, it receives a repulsive force from the current flowing through the conductor 38, is pushed toward the propagation path 41, and is guided to the detection loop 30. If gate 31 is operated as a replicator, the bubble will be divided into two parts,
One is fed into the detection path and the other into the minor loop again, thus providing a non-destructive readout. pattern 1
2, 13, . . . and 31, 32, . . . operate as transfer gates or replicators with reference to FIG. .

Further, C is a conductor surrounding the pattern T, Dl,
D2 is a half disk pattern, 11, 12... are I
It is a type of bar pattern. When the driving magnetic field HD is rotated counterclockwise as shown in FIG. 2b, in direction 1, a north pole is generated in part 1 of the pattern D1, and the bubble has an south pole on the surface side of the substrate on which the propagation pattern is attached. Then, the bubble is attracted to this part 1. Next, as the direction of the driving magnetic field HD changes 2, 3, etc., if no current is applied to the conductor C, the bubbles will form patterns Dl, l, l6, T, l3, l.
The signal propagates through portions 2, 3, . . . of 2, D2 as shown in the figure, and makes a U-turn at this gate. In other words, if no current is applied, the gate T pattern operates in the same way as a half disk. On the other hand, when a current 1 is passed through the conductor C in a direction in which the outside C1 becomes the north pole and the inside C2 becomes the south pole, the bubble that comes to the shoulder part 2 of the pattern T receives a repulsive force due to the magnetic field created by the current. Even if the driving magnetic field HD is directed in the direction 3, it cannot reach the vertex 3 of the pattern T, and instead, the deformed verno pattern 16
Move to near part 3a. Next, when the magnetic field HD faces in the direction 4, it moves to the portion 4a of the bar pattern 15, and thereafter leaves the loop formed by the patterns Dl, D2, . . . and propagates to other loops. In this way, pattern T and conductor C function as a transfer gate. The operation of the gate as a replicator is similar to that of Ma, but in this case, the phase and waveform of the current flowing through the conductor C are slightly different.

That is, Figure 2d shows the waveform of current 1 when the transfer gate is used, and Figure 2c shows the waveform of current 1 when the replicator is used.As shown in these figures, when the replicator is used, the phase of current 1 is delayed by τ and It has the shape of a rectangular wave with a sharp peak P. The width W of the rectangular wave portion is equal to the driving magnetic field H.
It is equal to the time it takes for D to rotate 1/4 of a tenon. When the time point at which the current 1 flows is delayed, the bubble moves from the shoulder 2 of the pattern T towards its top and has an elongated shape along the flat top. At this time, a current 1 with a sharp peak P flows,
When a repelling magnetic field is generated in the central portion C2 and an attractive magnetic field is generated in the outer circumferential portion C1, the bubble is divided into two parts and exists in both outer circumferential C1 portions of the conductor C of the pattern T. Next, the driving magnetic field H. When the driving magnetic field HD is directed in the direction 2, one bubble moves toward the part 3a of the pattern 16, and the other bubble remains in the same position, and when the driving magnetic field HD is directed in the direction 4, one bubble moves toward the part 3a of the pattern 15. The other bubble moves to the portion 4a, and the other bubble moves to the left shoulder portion 4 of the pattern T, and thereafter moves along each propagation path as described above. By the way, in a bubble memory with a major minor loop configuration using half disks, minor loops 2, 3, 4, etc. are formed as shown in the figure.
... is arranged for each 2 bits of the major loop 1 to increase the density of the trace pattern formed on the bubble magnetic substrate soil and increase the degree of integration. It is inferior to a bubble memory with a major-minor loop configuration using a T-bar pattern.

This is thought to be because the gates 12, 13, etc. have complex shapes, and because there is not enough space, they are susceptible to poor shapes and influences from other patterns. The present invention aims to improve these points by simple means and to obtain a memory with good characteristics without significantly lowering the degree of integration.

The present invention provides a magnetic bubble memory device having a major-minor loop configuration using a half-disk type propagation pattern and a gate, in which the minor loop is a loop having a meandering portion, and an outer portion of the loop opposite to the folded end of the meandering portion includes: It is characterized in that the gate is provided with a conductor pattern for bubble input/output and a pickaxe-shaped magnetic pattern, and one minor loop is provided in the major loop for each of the plurality of bits of 4 or more bits of the major loop,
Next, this will be explained in detail with reference to examples. Third
The figure shows an embodiment of the present invention, and like the previous figure, 1 is a major loop, 2, 3, 4, . . . are minor loops, and 30 is a major loop leading to a bubble detector.

The major loop 1 consists of a large number of half disks 11, and one gate for every 4 bits of the half disks 12, 13, . . .
is inserted. The minor loop 2 is one loop consisting of two turning points in FIG. 1, but in this example, it is a loop equivalent to a tenon 2 loop having four turning points. Such a loop (herein referred to as a loop with a meandering part) may further increase the number of meandering points to have 6 or 8 turning points. Make sure to provide one for each. The turning L point 2b of the meandering portion 2a that enters the inside of the minor loop 2 does not reach the turning point 2c of the outer loop, but turns back in the middle, so a space is created between the portions 2b and 2c.The gate 31 inserted into the minor loop. is placed in the center of the folded part 2c, and since a space is created in this part as described above, it is possible to create a long T-pattern for the gate, a conductor to be entwined with it, etc. with enough light margin, and Since it is sufficiently separated from the surrounding half-disk propagation patterns, mutual interference can be prevented. This also applies to minor loops 3, 4, and so on. If sufficient space for the gate is simply required, the inner meandering portion 2a may be removed and only the outer loop formed, but this would reduce the degree of integration.

In this regard, if the loop is formed with a meandering portion as in the present invention, and a space for the gate is secured while minimizing the occurrence of a blank portion, great advantages can be obtained in terms of operating margin and degree of integration. It has been experimentally confirmed that this structure increases the operating margin compared to the conventional device shown in FIG. In addition, in the device shown in FIG. 1, the lower part of the T-pattern leg Ta of the gates 31, 32, etc. of the minor loop is divided into a plurality of parts. This prevents the formation of strong magnetic poles at the ends of the legs when the legs are oriented, which tends to attract bubbles propagating through the surrounding half-disk propagation pattern (if split, there will be N and S poles at the split). (The magnetic field created around the pole becomes weaker. Also, the magnetic field generated at the bottom end is not as strong as when it is continuous, and the more it is divided into multiple pieces, the weaker the magnetic pole becomes.)
However, if the T pattern is separated from the surrounding half-disk propagation patterns as in the present invention, there is an advantage that there is no need to divide the leg into many parts because the risk of bubble suction is reduced. Furthermore, when the minor loop has a meandering portion as in the present invention, the number of bits in the minor loop increases and the access time increases, but this is not a particular problem unless the application requires particularly high-speed reading.

There are also many applications where slow readout is sufficient. Furthermore, in this example, bubbles are input from one turning point of the minor loop and bubbles are taken out from other turning points, but it is also possible to input and output bubbles at one turning point. As explained in detail above, according to the present invention, a half-disk type major-minor loop type bubble memory can be constructed with a sufficient operating margin and degree of integration, and has high gap tolerance. The advantage is that it enables a highly integrated memory configuration that takes advantage of the half-disk characteristics of .

[Brief explanation of drawings]

Fig. 1 is a schematic plan view explaining the structure and operation of a conventional bubble memory, Fig. 2a is an enlarged plan view of the gate section in Fig. 1, Figs. FIG. 1 is a schematic plan view showing an embodiment of the present invention. In the drawing, 1 is a major loop, 2, 3, 4, . . . are minor loops, 30 is a bubble detector, 11 is a half disk, and 12, 13, . . . are gates.

Claims (1)

[Claims] 1. In a magnetic bubble memory device with a major-minor loop configuration using a half-disk type propagation pattern and gate, the minor loop is a loop having a meandering portion, and a bubble is inserted into the outer portion of the loop opposite to the folded end of the meandering portion. A magnetic bubble characterized in that the gate is provided with a conductive pattern for output and a pickaxe-shaped magnetic pattern, and one such minor loop is arranged in the major loop for each of four or more bits of the major loop. memory device.