Fault tolerant flight data recorder
First Claim
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1. The method of storing serial bit data signal units in electronic memory, comprising the steps of:
- arranging the data signal units in successive frames, serially, from a data signal unit to a last data signal unit in each frame;
adding first and second pointer signal units following said last data signal unit in each frame, said first pointer and second pointer signal units and said data signal units each having a plurality of signal bits; and
storing the frames at successive memory address locations in electronic memory, by first storing said second pointer signal unit of a present frame to a first address location furthest from a preceding stored frame, and proceeding serially backwards with the data signal units until said first data signal unit of the present frame is stored at the address location of said second pointer signal unit of said preceding stored frame to replace said second pointer signal unit of said preceding stored frame, whereby said present frame is stored with said first and second pointer signal units and said preceding stored frames are stored with said first pointer signal unit.
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Abstract
Signal units of information stored in electronic memory are arranged in frames which are separated in memory by configurable end of data pointers, each frame stored with a first configuration pointer indicating a present frame, the storing of each present frame changing the preceding frame pointer to a second configuration, whereby loss of frame data due to power interruption during storage is limited to the identifiable present frame.
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Citations
5 Claims
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1. The method of storing serial bit data signal units in electronic memory, comprising the steps of:
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arranging the data signal units in successive frames, serially, from a data signal unit to a last data signal unit in each frame; adding first and second pointer signal units following said last data signal unit in each frame, said first pointer and second pointer signal units and said data signal units each having a plurality of signal bits; and storing the frames at successive memory address locations in electronic memory, by first storing said second pointer signal unit of a present frame to a first address location furthest from a preceding stored frame, and proceeding serially backwards with the data signal units until said first data signal unit of the present frame is stored at the address location of said second pointer signal unit of said preceding stored frame to replace said second pointer signal unit of said preceding stored frame, whereby said present frame is stored with said first and second pointer signal units and said preceding stored frames are stored with said first pointer signal unit. - View Dependent Claims (2, 3, 4, 5)
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Specification