Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1990-10-05
1993-04-20
Fleming, Michael R.
Static information storage and retrieval
Magnetic bubbles
Guide structure
365229, 364DIG1, 364273, 3642734, 36424691, 364DIG2, 3649649, 3649485, 3649489, G06F 1216
Patent
active
052049647
ABSTRACT:
A method and apparatus for resetting memory state when power is applied to the system. The memory has memory elements, a refresh clock and a refresh counter for counting refresh cycles and providing refresh signals to the memory elements, the memory elements and refresh means being connected from the power system and from a battery back-up means. A state detection means is connected from the refresh counter for detecting a change in state of the refresh counter to a state equivalent to the reset state of the refresh counter and asserting a state change signal. A means responsive to the state change signal and to the occurrence of the reset signal provides a memory controller reset signal, so that the memory controller reset signal occurs in synchronization with the change of state of the refresh counter to a state equivalent to the refresh counter reset state. The memory reset further includes a time-out counter means responsive to the assertion of the reset signal and to the refresh clock for counting refresh cycles in synchronization with the refresh counter. A time-out detection means is responsive to the time out counter means for providing a time out signal when the time-out counter has counted a refresh period plus one clock cycle and to the state change signal for providing the memory controller reset signal when the time-out counter has counted a refresh cycle plus one clock period and the state change signal has not been asserted.
REFERENCES:
patent: 4357686 (1982-11-01), Scheuneman
patent: 4977537 (1990-12-01), Dias
Barlow George J.
Bowden, III Raymond D.
Pence Michelle A.
Sanfacon Marc E.
Somers Jeffrey S.
Bull HN Information Systems Inc.
Clapp Gary D.
Fleming Michael R.
Knoll Clifford
Solakian John S.
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