Circulating access memory device

Claim 2

A circulating access memory device comprising: a first circulating memory circuit forming a major loop; second circulating memory circuits forming a plurality of minor loops each coupled to the major loop through each gate circuit; readout signal detector means, information write-in means and information erasing means each of which means is coupled to the first memory circuit; switching means each coupled to one of the second memory circuits; third circulating memory circuits forming a plurality of sub-minor loops and coupled to the respective switching circuits; and a switching control circuit for controlling the switching circuits to swap the stored information among each second memory circuit and the corresponding each third memory circuit.

Claim 3

A circulating access memory device as claimed in claim 1 further comprising eraser circuits in the final stage of the third circulating memory circuits.

Claim 4

A circulating access memory device comprising: major loop means for circulating data therein, a plurality of minor loop means for circulating data therein, each said minor loop means being positioned adjacent said major loop means, gate means for controllably transferring data between said minor loop means and said major loop means; writing means for writing data into said major loop means; eraser means connected to said major loop means for erasing data stored in said major loop means; a plurality of sub-minor loop means for circulating data therein, each said sub-minor loop means being associated with one of said minor loop means, and switching means for switching data between each of said minor loops and its associated sub-minor loop means.

Claim 5

A circulating access memory device comprising: major loop means for circulating data therein, a plurality of minor loop means for circulating data therein, each said minor loop means being positioned adjacent said major loop means, gate means for controllably transferring data between said minor loop means and said major loop means; writing means for writing data into said major loop means; eraser means connected to said major loop means for erasing data stored in said major loop means; a plurality of sub-minor loop means for circulating data therein, each said sub-minor loop means being associated with one of said minor loop means, and switching means for switching data between each of said minor loops and its associated sub-minor loop means.

Claim 6

A circuit as set forth in claim 3, further comprising second eraser means connected to each of said sub-minor loop means for erasing data circulating therein.

Claim 7

A circuit as set forth in claim 3, further comprising means for controlling the operation of said switching means to swap data between each of said minor loop means and its associated sub-minor loop means.

Claim 8

In a magnetic bubble domain circuit of the type comprising a sheet of magnetic material capable of retaining bubble domains, means for applying a biasIng magnetic field normal to the sheet, means for generating in-plane magnetic fields parallel to the surface of the sheet, and a ferromagnetic thin film overlay circuit disposed adjacent to the sheet and comprising bubble domain storage elements arranged to form a major loop serving as a circulating transfer loop and a plurality of minor loops serving as circulating memory loops, said bubble domains being adapted to be transferred between said major loop and each of said minor loops, the improvement comprising: means for defining on the sheet a plurality of sub-minor loops serving as circulating memory loops, and switching means for switching bubble domains between each of said minor loops and its associated sub-minor loop.

Claim 9

In a magnetic bubble domain circuit of the type comprising a sheet of magnetic material capable of retaining bubble domains, means for applying a biasIng magnetic field normal to the sheet, means for generating in-plane magnetic fields parallel to the surface of the sheet, and a ferromagnetic thin film overlay circuit disposed adjacent to the sheet and comprising bubble domain storage elements arranged to form a major loop serving as a circulating transfer loop and a plurality of minor loops serving as circulating memory loops, said bubble domains being adapted to be transferred between said major loop and each of said minor loops, the improvement comprising: means for defining on the sheet a plurality of sub-minor loops serving as circulating memory loops, and switching means for switching bubble domains between each of said minor loops and its associated sub-minor loop.

Claim 10

A circuit as set forth in claim 6, wherein said switching means comprises a bubble branching circuit and a bubble mixing circuit provided at each junction of said minor loops and said sub-minor loops, said bubble branching circuits operating to transfer bubbles between their associated adjacent loops, said bubble mixing circuits operating to receive such transferred bubbles.

Claim 11

A circuit as set forth in claim 6, further comprising: means for defining on the sheet a second plurality of sub-minor loops serving as circulating memory loops; and second switching means for switching bubble domains between each of said second plurality of sub-minor loops and its associated one of said sub-minor loops coupled to said minor loops.

Claim 12

A circuit as set forth in claim 6, wherein each of said minor loops has a plurality of sub-minor loops connected thereto in series with each other.

Claim 13

A circuit as set forth in claim 9, further comprising a bubble eraser connected to the sub-minor loop remotest from its associated one of said minor loops.