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Compact Decoder for Bubble Domain Memories

IP.com Disclosure Number: IPCOM000077444D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Almasi, GS: AUTHOR [+2]

Abstract

Fig. 1 shows a compact decoder suitable for bubble domain memories which uses a combination of "normally upper path" switches (SW1) and "normally lower path" switches (SW2). In this way, information on the various input propagation paths I1, I2, I3, and I4 can be selectively passed to the corresponding output propagation paths O1, O2, O3, and O4, respectively. Depending upon the current inputs A, B to the decoder, information in a single propagation input path will be sent to the appropriate output path, while information in all other input propagation paths will be sent to an annihilator. For instance, appropriate current inputs A, B will cause domains in input path I1 to pass through current-control switches SW1 to output path O1, rather than to annihilator A1.

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Compact Decoder for Bubble Domain Memories

Fig. 1 shows a compact decoder suitable for bubble domain memories which uses a combination of "normally upper path" switches (SW1) and "normally lower path" switches (SW2). In this way, information on the various input propagation paths I1, I2, I3, and I4 can be selectively passed to the corresponding output propagation paths O1, O2, O3, and O4, respectively. Depending upon the current inputs A, B to the decoder, information in a single propagation input path will be sent to the appropriate output path, while information in all other input propagation paths will be sent to an annihilator. For instance, appropriate current inputs A, B will cause domains in input path I1 to pass through current-control switches SW1 to output path O1, rather than to annihilator A1. At the same time, information in the other input paths I2, I3, and I4 will be routed to annihilators A2, A3, and A4, respectively.

Fig. 2 shows current-controlled switch SW1, while Fig. 3 shows current- controlled switch SW2. For SW1, bubble location 1 on T-bar 10 is a point of ambiguity so that in the absence of current I in the control line 12, the bubble domain is not sure whether to proceed to location 2' on bar 14 or 2'' on T-bar 10. A positive current I (in the direction shown) steers the domain to location 2', while a negative current (in the opposite direction) steers the bubble to location 2'' and then onto the lower path leading to annihilator A.

Fig....