Bubble redundancy map storage using non-volatile semiconductor m

Details Bubble redundancy map storage using non-volatile semiconductor m Bubble redundancy map storage using non-volatile semiconductor m

1976-12-17

1982-10-12

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Plural interacting paths

364900, G11C 1908

Patent

active

043542530

ABSTRACT:
A magnetic domain memory system is provided that includes magnetic domain data chips having a major-minor loop organization wherein the system may include data chips having one or more defective minor loops. An erasable non-volatile semiconductor memory device is provided to record locations of defective minor loops for each chip in the system. In order to update the defective minor loop locations when a data chip is replaced a random access memory is provided to store the present map of locations and substitute data designating the new defective minor loops. A method of replacing the map in the erasable non-volatile semiconductor memory is also disclosed. An array of binary one bit data in the form of "1" or "0" is stored in the non-volatile semiconductor memory to designate defective and operative minor loops.

REFERENCES:
patent: 3755791 (1973-08-01), Arzubi
patent: 3909810 (1975-09-01), Naden et al.
patent: 4070651 (1978-01-01), Naden
patent: 4073012 (1978-02-01), Ohnigian et al.
patent: 4090251 (1978-05-01), Flannigan et al.

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