Redundancy map storage for bubble memories

Details Redundancy map storage for bubble memories Redundancy map storage for bubble memories

1977-05-16

1984-07-03

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

365 12, 365 15, G11C 1908

Patent

active

044583346

ABSTRACT:
A magnetic bubble domain memory device is provided that includes a magnetic bubble domain data chip having a major/minor loop organization in which one or more defective minor loops may be tolerated. Information in the form of a redundancy map is stored within the plurality of minor loops in a single page thereof, where a page is defined as one bit of information from the same virtual position on each of the plurality of minor loops. This redundancy map comprises firmware wherein the presence of a magnetic bubble domain within the designated page at a specified bit position identifies the particular minor loop corresponding to that bit position as a good loop, and conversely the absence of a bubble within the page at a specified bit position identifies the particular minor loop corresponding to that bit position as a defective loop.

REFERENCES:
patent: 3792450 (1974-02-01), Bogar et al.
patent: 3909810 (1975-09-01), Naden et al.
patent: 3997877 (1976-12-01), Naden
patent: 4073012 (1978-02-01), Ohnigian et al.
patent: 4090251 (1978-05-01), Flannigan et al.
patent: 4354253 (1982-10-01), Naden

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