| CPC G06F 3/0659 (2013.01) [G06F 3/0625 (2013.01); G06F 3/0679 (2013.01); G11C 16/30 (2013.01)] | 6 Claims |
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1. A storage device comprising:
a non-volatile memory device configured to receive an operating command and perform an operation corresponding to the operating command;
a voltage generating circuit configured to generate an operating voltage according to the operating command, the voltage generating circuit including a charge pump configured to generate an operating voltage, an oscillator configured when enabled to drive the charge pump, and a regulator configured to regulate the operating voltage by applying a pump enable signal to selectively enable the oscillator, wherein the regulator is configured to output the pump enable signal as having a first level when the operating voltage is less than a first reference voltage and as having a second level when the operating voltage is equal to or higher than the first reference voltage; and
a flag generating circuit configured to receive a busy signal and the pump enable signal, the busy signal indicative of the non-volatile memory device performing the operation, and to output a flag signal based on the busy signal and the pump enable signal,
wherein the oscillator is enabled when the pump enable signal is at the first level and is not enabled when the pump enable signal is at the second level,
wherein the busy signal has the first level when the non-volatile memory device performs the operation, and
the flag generating circuit is configured to transition the flag signal from the second level to the first level in response to the pump enable signal transitioning from the first level to the second level while the busy signal is at the first level, and to maintain the flag signal at the first level until the busy signal transitions from the first level to the second level.
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