Static information storage and retrieval – Magnetic bubbles
Patent
1978-09-29
1980-11-11
Moffitt, James W.
Static information storage and retrieval
Magnetic bubbles
324210, G11C 1908
Patent
active
042336686
ABSTRACT:
Method and apparatus for testing a magnetic bubble memory are disclosed wherein a most severe magnetic bubble domain arrangement which fully causes the ununiformity of magnetic interaction between magnetic bubble domains is experimentally determined, and a basic pattern [P] and a test information pattern determining an arrangement of the basic patterns [P] and complementary patterns [P] thereof for realizing that magnetic bubble domain arrangement are stored in memory units, respectively, and the basic patterns [P] and the complementary patterns [P] are sequentially read out in accordance with the test information pattern to generate magnetic bubble domain trains in a storage area of the magnetic bubble memory. The magnetic bubble domain trains are then read out by a magnetic bubble detector and the read-out signals are converted to logical signals by a sense amplifier unit and the logical signals are synchronized with logical signals corresponding to the test information pattern and compared therewith to produce an identity or non-identity signal and thus the disclosed method and apparatus for testing the magnetic bubble memory can exactly evaluate a memory characteristic of the magnetic bubble memory.
REFERENCES:
patent: 3460109 (1969-08-01), Veneziano
patent: 4061908 (1977-12-01), de Jonge
IEEE Transaction on Magnetics-vol. Mag-11, No. 6, Nov. 1975, pp. 1685-1688.
Electronics-"Bubble Memories Demand Unique Test Methods" by Bisset et al., May 10, 1979, pp. 117-122.
Electronics-"Tester for Bubble Memories First in Field" by R. Brownstein, Apr. 26, 1979, pp. 167-168.
Hibi Susumu
Kobayashi Akira
Yamaguchi Nakahiko
Yoshimoto Shoji
Yoshizawa Shigeru
Hitachi , Ltd.
Moffitt James W.
Nippon Telegraph and Telephone Public Corporation
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