JPS6137700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in magnetic bubble memory chips.

Generally, magnetic thin films have magnetic domains with easy magnetization axes in the in-plane direction, but in some types of magnetic thin films, such as orthoferrite and magnetic garnet, magnetic domains have easy magnetization axes perpendicular to the film plane. When a perpendicular magnetic field is applied to this thin film, the strip-shaped magnetic domains become cylindrical magnetic domains (bubble domains) at a certain magnetic field strength. This bubble domain has a diameter of several micrometers or less and can move freely within the magnetic thin film depending on the gradient of the magnetic field. Therefore, a magnetic bubble memory device utilizes this bubble domain as a memory element. At present, the block replica system as shown in FIG. 1 is becoming mainstream in the structure of memory chips used in magnetic bubble memory devices. To briefly explain this, a plurality of information storage loops 3 are connected to an information writing propagation path 2 connected to a bubble generator 1, and the opposite side of the plurality of information storage loops 3 is connected to a detector 4. Connected information readout propagation path 5
Furthermore, a transfer gate 6 is provided between the information writing path 2 and the information storage loop 3, and the information storage loop 3
A transfer out gate 7 is provided between the information reading propagation path 5 and the information reading propagation path 5. Note that the terminal end of the information writing propagation path 2 is connected to the eraser 8. In such a memory chip, if it is desired to read information, immediately after the information passes through the read-side gate, it cannot be read out from the storage loop until it has gone around the storage loop almost once. The present invention has been devised to improve this drawback.

Therefore, in the present invention, in a magnetic bubble memory chip having a plurality of information storage loops connected to one information writing propagation path and one information reading propagation path, the information storage loop and the information writing A gate that performs a transfer-in function and a replicate-out function is provided between the information storage loop and the information read-out propagation path, and a gate that performs a transfer-out function and a replicate-out function is provided between the information storage loop and the information readout propagation path. Furthermore, the terminal end of the information writing propagation path and the terminal end of the information reading propagation path are merged, so that reading can be performed from either of them.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 2 shows a configuration diagram of the embodiment. In this example,
A plurality of information storage loops 3 are connected to the information writing propagation path 2 connected to the bubble generator 1, and the opposite side of the plurality of information storage loops 3 is connected to the information reading propagation path 5. The terminal end of the information writing propagation path 2 and the terminal end of the information reading propagation path 5 merge and are connected to the detector 4. Further, a gate 9 having a transfer-in function and a replicate-out function is provided between the information writing propagation path 2 and the information storage loop 3, and a transfer gate 9 is provided between the information reading propagation path 5 and the information storage loop 3. A gate 10 having an out function and a replicate out function is provided.

An example of the pattern of each gate is shown in FIG. In the figure, reference numeral 9 is a gate that has both transfer-in and replicate-out functions.
This gate has a rotating magnetic field H _D that drives the bubble at 180
By using the portions Tr-in and Re-out, which have different phases, it is possible to use the two functions separately.

The operation of the magnetic bubble memory chip of this embodiment constructed in this manner will be described below. First, as shown in Fig. 4, if the bubble propagation direction in the information storage loop 3 is counterclockwise as indicated by the arrow, and the information to be read is at point P, then the number of bits from point P to gate 9 counterclockwise is _N1. , the number of bits up to gate 10 is N ₂
shall be. Next, N ₁ and N ₂ are compared according to the procedure shown in the flowchart of FIG. 5, and the smaller gate is read out. By doing this, the information you want to read is at the gate 1 on the read side.
Immediately after passing through 0, the information can be read from the write side gate 9 by going around the information storage loop 3 approximately half way.

As explained above, the magnetic bubble memory chip of the present invention has a gate with a transfer-in function and a replicate-out function on the write side, and the write side propagation path merges with the read side propagation path, thereby reducing the information read time (average access This made it possible to shorten the time required.

[Brief explanation of the drawing]

Figure 1 shows one example of the conventional block replication method.
FIG. 2 is a configuration diagram of a magnetic bubble memory chip according to an embodiment of the present invention, FIG. 3 is a schematic diagram of an example of a gate pattern of an embodiment, and FIG. 4 is an explanatory diagram of the operation of an embodiment. , FIG. 5 is a flow chart thereof. 1...Bubble generator, 2...Propagation path for information writing, 3...Information storage loop, 4...Detector, 5
...Propagation path for information reading, 9, 10...gate.

Claims (1)

[Claims] 1. In a magnetic bubble memory chip having a plurality of information storage loops connected to one information writing propagation path and one information reading propagation path,
A gate that performs a transfer-in function and a replicate-out function is provided between the information storage loop and the information writing propagation path, and a gate that performs a transfer-out function and a replicate-out function is provided between the information storage loop and the information reading propagation path. A magnetic bubble memory chip characterized in that it is provided with a gate that performs an out function, and furthermore, the terminal end of an information writing propagation path and the terminal end of an information reading propagation path are merged, so that reading can be performed from either of them.