Low power configuration for USB (Universal Serial Bus) devices

摘要

The present disclosure provides for a method and semiconductor device for low power configuration. In one embodiment, a method includes receiving a packet from a host device, where the packet is received at a USB (Universal Serial Bus) device. The method also includes detecting, by the USB device, that the packet includes an endpoint address of a low power endpoint. The method also includes entering a low power mode state, in response to the detecting, where the USB device includes a USB clock domain that includes an internal reference clock (IRC) and clock recovery logic, and a clock tree block located outside of the USB clock domain. The entering the low power mode state includes disabling the clock tree block, and clocking the USB clock domain using the IRC and clock recovery logic.

主权项

1. A method comprising:
receiving a packet from a host device, wherein
the packet is received at a USB (Universal Serial Bus) device; detecting, by the USB device, that the packet includes an endpoint address of a low power endpoint; and entering a low power mode state, in response to the detecting, wherein
the USB device comprises
a USB clock domain that includes an internal reference clock (IRC) and clock recovery logic, anda clock tree block located outside of the USB clock domain, andthe entering the low power mode state comprises
disabling the clock tree block, andclocking the USB clock domain using the IRC and clock recovery logic.