USB DEVICE SIDE WAKE-UP FOR POWER CONSERVATION AND MANAGEMENT
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United States of America Patent
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Issued Date -
Jan 31, 2013
app pub date -
Jul 29, 2011
filing date -
Jul 29, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a system in which a host device is in communication with a peripheral device through communications device connected to a USB port, the USB host device polls the communications device to constantly regardless of the power state of the USB communications device. While in the low power mode, the USB communications device generates NAK packets, indicating that the device has no data to send. The NAK packets are generated in hardware, thereby allowing the USB host continues operating while unaware of the state of the peripheral device. External events can be used to trigger the USB communications device to exit the low power state without communicating with the USB host, and without the USB host altering its behavior.
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