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AssigneeCypress Semiconductor Corporation
InventorsStephen Henry Kolokowsky, Mark McCoy
Estimating the term…
A device capable of operating at both a low power mode and at a high power mode which is connected to a host by a USB connection. The device includes a non-volatile memory which stores the operating state of the device when the host goes into hibernate mode and a flag which indicates that the host has entered the “hibernate” mode. When the device powers up, the previous state of the device is read from the memory. If the previous state was high power and the hibernate flag is set, the device restarts in high power mode without the need of any initialization to determine if the host will allow operation at high power speed mode. The device determines that the host is going into suspend mode (rather than power down mode) by determining if a suspend signal on the USB bus is followed by a power down operation.
A method of operating a peripheral device connected to a host via a Universal Serial Bus (USB), said device being able to operation at either low power mode or high power mode, said method including:
A peripheral device adapted for connection to a host via a Universal Serial Bus (USB), said peripheral device capable of operating at both a low power mode and a high power mode, said peripheral device including the combination of;
A method of operating a peripheral device connected to a host via a Universal Serial Bus (USB), said host having a hibernate mode, said peripheral device being able to operation at either low power mode or high power mode, said method including:
Dependencies are inferred from the claim text.