Solid state memory for aircraft flight data recorder systems
US4644494A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1984 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Feb 6, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/30
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A memory unit for a aircraft flight data recorder system uses an electronically erasable solid state memory for storing the flight 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 applies 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 flight 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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.