Static information storage and retrieval – Powering
Patent
1996-04-03
1998-06-02
Nguyen, Viet Q.
Static information storage and retrieval
Powering
365227, 365228, 365222, G06F 1214
Patent
active
057611440
ABSTRACT:
A memory card includes a volatile memory device, and a power supply supplying an electric voltage to the memory device while the memory card is connected to a host. A timer is started when the memory card is connected to the system. A current detector detects a current flow between a pair of terminals connected to a host. A power supply controller provided between the memory device and the power supply opens repetitively when the current detector does not detect a prescribed current flow before the timer completes a prescribed timing cycle. Thus, the memory card can be accessed only when it is connected to a host having a security function in correspondence to the memory card, while it clears the data stored therein when it is connected to a host which does not correspond to the memory card. Preferably, the current detector is activated by an active signal received from a host. The memory card may also include a timer activated when the memory card is connected to the host or when an active signal is supplied from the host. The memory card also includes at least one pair of terminals connected to corresponding terminals of the host, a current detector detecting current flow between the terminals, and a power supply controller for opening repetitively between the memory device and the power supply when the current detector does not detect a prescribed current flow before the timer completes a prescribed timing cycle.
REFERENCES:
patent: 4816654 (1989-03-01), Anderl et al.
patent: 4882474 (1989-11-01), Anderl et al.
patent: 5521590 (1996-05-01), Hanaoka et al.
patent: 5553294 (1996-09-01), Nanno et al.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Viet Q.
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