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Pulse Sequence Bubble Domain Logic

IP.com Disclosure Number: IPCOM000078245D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Beausoleil, WF: AUTHOR [+2]

Abstract

This means of propagating magnetic bubble domains into selective channels, utilizes a change in the sequence of the propagation magnetic field to selectively route the bubble domains. Consequently, the number of control lines and wire interconnections to the bubble domain system is significantly reduced.

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Pulse Sequence Bubble Domain Logic

This means of propagating magnetic bubble domains into selective channels, utilizes a change in the sequence of the propagation magnetic field to selectively route the bubble domains. Consequently, the number of control lines and wire interconnections to the bubble domain system is significantly reduced.

In the drawing, a magnetic sheet 10 in which the domains exist and can be propagated has deposited thereon a propagation circuit pattern, comprised of magnetically soft elements such as T-bars, I-bars, and Y-bars. The box labeled G is a bubble domain generator, while the box labeled A is a bubble domain annihilator. A set of drive coils provides a magnetic field H in the plane of magnetic sheet 10, which normally rotates in the directions labeled 1, 2, 3 and 4, as indicated. When field H rotates clockwise through the positions 1-4, a domain is drawn out of generator G when field H is in direction 3. The domain is then located at position a on Y bar 12. As field H continues its clockwise rotation, the domain moves to position b on Y bar 12 and then to position c on bar 12. The domain then moves to position d on I-bar 14 when field H is in direction 2. After this, the domain moves sequentially to positions e, f and g on T bar 16 as field H continues to rotate. Finally, the domain is drawn to annihilator A.

If the sequence of directions of field H is varied, the domains can be made to enter shift register SR-1. In this case, the applied field directions are the following: 3, 4, 2, 4, 1, 2, 3, 4, 1, 2, 3, 4, etc. During this sequence of applied field directions, the domain will move from generator G to positions a, b, and h on Y bar 12, after which the ---~ domains will move to positions i, j, k and 1 on position Y bar 18. The domains will then move to positions m, n, o, on T bar 20 and then to position p on I bar 22, after which they move to position q on Y bar 24. Thus, a change in the applied field sequence causes domains from generator G to move into shift register SR-1, rather than propagating to annihilator A.

Register SR-1 is a read-in shift register while registers SR-2 and SR-3 are two vertical registers, which are used to store domains in magnetic sheet 10. The arrows 26, 26' and 28, 28' indicate the normal domain flow which occurs in each register, when the conventional clockwise sequence of propagation field occurs.

If the normal clockwise applied field is followed, domains which have been entered into register SR-1 will continue to circulate in it in a counterclockwise direction. Alteration of this pulse sequence causes domains initially at position t on Y bar 30 to be moved up into SR-3. For instance, when a domain is at position r on I bar 32, the following H field sequence is applied: 2, 3, 1, 3, 4, 1, 2, 3, 4, 1, etc. Following this sequence will cause the domain to move to positions ...