Bubble memory redundancy storage

Details Bubble memory redundancy storage Bubble memory redundancy storage

1977-06-09

1978-05-16

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

365 12, 365 15, G11C 1908

Patent

active

040902510

ABSTRACT:
A magnetic bubble domain memory device is provided that includes a magnetic domain data chip having a major-minor loop organization with on-chip firmware providing redundancy information enabling the use of the chip even though one or more defective minor loops may be present thereon. The first page written in the minor loops, where a page is defined as a common bit position in each of the plurality of minor loops, presents a series of magnetic domains and voids where the magnetic domains represent the operable minor loops and the voids represent the defective minor loops. The second page in the minor loops is a series of magnetic domains and voids separated into bytes of information which are representative of the loop numbers of defective minor loops on the chip, and a third page in the minor loops is a repetition of the first page of data. Collectively, the three pages comprise the on-chip firmware providing redundancy information. This magnetic domain structure is capable of screening out defective minor loops in the read and write operations, and enables synchronization of the magnetic domain device such that a selected page of data may be readily accessed from the plurality of minor loops when desired.

REFERENCES:
patent: 3792450 (1974-02-01), Bogar et al.

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