| 摘要 |
A circuit for controlling operations of a Universal Serial Bus (USB) device includes a frequency converter, a USB PHY, and a USB core. The circuit is provided with a first clock having a first frequency, where the first frequency is not a factor of a USB specified frequency. The frequency converter converts the first clock into a basic clock having a basic frequency, where the basic frequency is a factor of the USB specified frequency. The USB PHY is coupled to the frequency converter and operates based upon the basic clock and allows the USB device to communicate with an external USB apparatus. The USB core is coupled to the USB PHY and controls parallel data transferred between the USB core and the USB PHY.
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