Storage subsystem with embedded circuit for protecting against anomalies in power signal from host
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United States of America Patent
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Oct 24, 2006
Grant Date -
Jun 9, 2005
app pub date -
Jan 18, 2005
filing date -
Apr 3, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A storage subsystem, such as a flash memory card, includes a voltage detection circuit that monitors the power signal from a host system to detect anomalies. The voltage detection circuit responds to a power signal anomaly by asserting a signal, such as a busy signal on a standard ready/busy signal line, to block the host system from performing write operations to the storage subsystem during presence of the anomaly. The storage system may also include a backup power source, such as a charge pump circuit, a capacitive array, and/or a rechargeable battery, that provides power to a controller of the storage subsystem during the presence of the anomaly, such that the storage system can complete outstanding operations.
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