Browse Prior Art Database

Method for Obtaining Mini Blocks on a Magnetic Bubble Chip

IP.com Disclosure Number: IPCOM000052769D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Collins, TW: AUTHOR [+2]

Abstract

High density magnetic bubble chips with major/minor loop designs having double period propagators in the input and output major tracks result in minor loops separated by one drive field rotation instead of the usual two. As a result, bubbles arrive at the detector on every cycle, and an every-bit-detect scheme is required. However, detector performance can be improved with the use of a predetermined zero bit position to compare the bubble signal to. As a result, zero bit positions must be inserted into the bit stream.

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Method for Obtaining Mini Blocks on a Magnetic Bubble Chip

High density magnetic bubble chips with major/minor loop designs having double period propagators in the input and output major tracks result in minor loops separated by one drive field rotation instead of the usual two. As a result, bubbles arrive at the detector on every cycle, and an every-bit-detect scheme is required. However, detector performance can be improved with the use of a predetermined zero bit position to compare the bubble signal to.

As a result, zero bit positions must be inserted into the bit stream.

The device designs shown in Figs. 1 and 2 provide zero bit positions on the chip without losing capacity. As shown in Fig. 1, a zero bit was inserted into output track 10 by placing two single period propagators 12 between two double period propagators 14, thereby grouping the minor loops 16A, 16B and 16C into one mini-block and minor loop 18A into another mini-block.

As shown in Fig. 2, a zero bit was inserted into the input track 20 by replacing the double period propagators located between double period propagators 22 and 24 with two one and one-half propagators 26 and 28 and one single propagator 30.

The C-bar elements 32, 24, 36 and 38 are positioned between the input track 20 and the corner elements 40, 42, 44 and 46 of the minor loops.

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