Means for maintaining the identification of defective minor loop

Details Means for maintaining the identification of defective minor loop Means for maintaining the identification of defective minor loop

1978-12-04

1980-11-18

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Plural interacting paths

365 2, G11C 1908

Patent

active

042349354

ABSTRACT:
An approach for maintaining the identification of the defective minor loops of a bubble domain memory system having one or more major/minor loop arrays is disclosed. The bubble domain memory system has a plurality of minor loops for the storage of data bits including some minor loops which are defective. There is a plurality of pointers that identify the defective minor loops. At least one block of bits in each major/minor loop array is reserved for the storage of the pointers. The pointer block is associated with a fast access read/write memory, for example, a volatile random-access read/write memory system, to which the pointer information is transferred during power-on initialization of the bubble domain memory system. During the read/write operations of the bubble domain memory system, the read/write memory system enables the data positions to be skipped that correspond to the defective loops.

REFERENCES:
patent: 4090251 (1978-05-01), Flannigan et al.
patent: 4159412 (1979-06-01), Naden et al.

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