G - Physics – 11 – C
Patent
G - Physics
11
C
354/237, 352/82,
G11C 7/00 (2006.01) G06F 12/02 (2006.01) G06F 12/16 (2006.01) G06F 17/40 (2006.01) G11C 16/06 (2006.01) G11C 16/20 (2006.01) G11C 16/22 (2006.01) G11C 16/30 (2006.01) G11C 29/00 (2006.01)
Patent
CA 1239695
CRASH SURVIVABLE SOLID STATE MEMORY FOR AIRCRAFT FLIGHT DATA RECORDER SYSTEMS Abstract Of The Disclosure A crash survivable memory unit for a aircraft night data recorder system is disclosed wherein an electronically erasable solid state memory for storing the night data And a memory controller circuit are housed in a penetration resistant, thermally insulated enclosure. Power dissipation within the insulated enclosure is minimized by an external switching circuit that applys operating potential to the solid state memory only when data are being transferred to and from the memory circuit. A data protection circuit, located within the insulated enclosure inhibits memory write and erase operations whenever the system operating potential falls below a predetermined level. In continuously storing flight data, the oldest stored data is overwritten with newly arriving night data and the memory controller maintains an erased boundary that defines the beginning and end of the recorded data. A power monitor circuit, located outside the insulated enclosure, resets the memory controller to the erased boundary following a power interruption. A dedicated portion of the memory space is utilized to store the address of faulty memory locations (detected during the data storage sequence) and stores the beginning and ending memory address of selected portions of the data record. The memory controller is sequenced to skip both the faulty memory locations and memory storage locations associated with the selected portions of the data record when new flight data is being stored.
469946
Riches Mckenzie & Herbert Llp
Sundstrand Data Control Inc.
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