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Magnetic Domain Data Storage System with Multifunction Encodes/Decodes

IP.com Disclosure Number: IPCOM000077592D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Grubb, HR: AUTHOR [+2]

Abstract

Multiple shift registers SR-1 -- SR-N are formed by magnetic overlays on a sheet 10 of magnetic domain material such as orthoferrites, hexagonal ferrites or garnet. Sheet 10 is subjected to the usual bias field H(z), and domain propagation through the shift registers and along the various data flow paths is produced by the usual rotating in-plane magnetic field H(R). Each register SR-1 -- SR-N has parallel domain data paths A, B, C and D connected to a common return path K. Shift register selection and switching of domain data propagated along the various paths is obtained by selective energization of various combinations of current loop encode/decode lines 11, in combination with energization of data and read control line 12, write control line 13 and domain generator 14.

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Magnetic Domain Data Storage System with Multifunction Encodes/Decodes

Multiple shift registers SR-1 -- SR-N are formed by magnetic overlays on a sheet 10 of magnetic domain material such as orthoferrites, hexagonal ferrites or garnet. Sheet 10 is subjected to the usual bias field H(z), and domain propagation through the shift registers and along the various data flow paths is produced by the usual rotating in-plane magnetic field H(R). Each register SR-1 -- SR-N has parallel domain data paths A, B, C and D connected to a common return path K. Shift register selection and switching of domain data propagated along the various paths is obtained by selective energization of various combinations of current loop encode/decode lines 11, in combination with energization of data and read control line 12, write control line 13 and domain generator 14.

When propagated by the rotating magnetic field H(R), data bits 1, 2 and 3 are propagated serially in a counterclockwise direction. A particular domain storage path for individual registers SR-1 -- SR-N is chosen by energizing appropriate decode lines 11. 2N lines will decode 2/N/ shift registers, however, only N lines are energized. These lines are common to all shift registers, however, only one shift register will be decoded to allow domain bits to be read out along path A. For all other registers not selected for readout, as data progresses along the decode path A, a magnetic interaction with a decode line 11 causes the magnetic domains to switch irreversibly to path B, as indicated by arrows 15. Decoding is arranged so that only the selected loop exits domains on path A, while all other shift registers have bits exiting path B. At point B the readout domain is split, one domain exits to output channel 16 for detection and utilization, the other split domain remains in the loop for return to the shift register along path K. Nonselected shift registers use path B to return their...