Data access method and data access apparatus for accessing data at on-vehicle information device
AssigneesXanavi Informatics Corporation, Nissan Motor Co., Ltd.
InventorsHirohisa Miyazawa, Gaku Sone, Seiichi Kozaki
Life of this patent
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Abstract
In a data access method for accessing data in an on-vehicle information device having an on-vehicle memory unit that allows data stored therein to be read out and overwritten by an external apparatus and an on-vehicle control unit that executes a data read and a data overwrite by controlling the on-vehicle memory unit, supplying power to the on-vehicle information device from the external apparatus when a power switch at the on-vehicle information device is in an OFF state, and reading out the data in the on-vehicle memory unit and overwriting the data through control implemented by the external apparatus.
Claims6
A data access method for accessing data in an on-vehicle information device having an on-vehicle memory unit that allows data stored therein to be read out and overwritten by an external apparatus and an on-vehicle control unit that executes a data read and a data overwrite by controlling the on-vehicle memory unit, comprising:
- supplying power to the on-vehicle information device from the external apparatus when a power switch at the on-vehicle information device is in an OFF state, and
- reading out the data in the on-vehicle memory unit and overwriting the data through control implemented by the external apparatus.
A data access system comprising:
- an on-vehicle information device having an on-vehicle memory unit that allows data stored therein to be read and overwritten from the outside, an on-vehicle control unit that executes a data read out and a data overwrite by controlling the on-vehicle memory unit and an on-vehicle interface unit that executes conversion of a control signal exchanged between the on-vehicle memory unit and the on-vehicle control unit;
- and
- a data access apparatus having an external memory unit having stored therein data to be used to overwrite data in the on-vehicle memory unit, an external control unit that reads out data in the on-vehicle memory unit and overwrites the data in the on-vehicle memory unit with data in the external memory unit by controlling the external memory unit and the on-vehicle memory unit, and an external interface unit that converts a control signal input and output between the external memory unit and the on-vehicle control unit and between the on-vehicle memory unit and the on-vehicle control unit, wherein:
- the information device further includes a selector switch that selects the on-vehicle control unit and the on-vehicle interface unit to be connected with the on-vehicle memory unit until the data access apparatus outputs a changeover command and allows the external control unit and the external interface unit to be connected with the on-vehicle memory unit after the changeover command is output.
Dependencies are inferred from the claim text.