JPS5482135A

JPS5482135A - Test method for bubble memory

Info

Publication number: JPS5482135A
Application number: JP15021977A
Authority: JP
Inventors: Seiichi Iwasa; Kengo Nogai
Original assignee: Fujitsu Ltd
Current assignee: Fujitsu Ltd
Priority date: 1977-12-14
Filing date: 1977-12-14
Publication date: 1979-06-30
Also published as: JPS6048062B2

Abstract

PURPOSE: To detect the fault of the generation and erasion modes of all loops through just twice writing and reasing in the odd-even division, and thus to reduce the test time.

CONSTITUTION: Bubble B₁ is written into even loop 10 and 12 apiece and then read out after a circulation. In case only the read-out bubble from loop 10 and 12 is equivalent to figure (a)'-(2), no erasion fault exists in the even loop nor propagation occurs from the even loop to the odd loop. Then the area near B₁ is read. And if no bubble from the even loop exists, no generation fault is caused in the even loop of figure (a)'-(3) nor bubble propagation occurs from the even loop to the odd loop when no reading bubble from the odd loop exists. So is the same in case bubble B₂ is written into odd loop 11 and 13. However, if generation fault d₂ exists in loop reading bubble from loop 11 exists and therefore the generation fault exists in the corresponding loop.