Patent ID: 8762762

Claim:
An apparatus for generating a local clock signal, comprising: a USB adapted to receive a USB data stream; a reference signal source for providing a reference signal; timing circuitry for determining a frequency of a periodic data structure decoded from the USB data stream by comparing the periodic data structure with said reference signal; and circuitry for generating a local clock signal having a desired local clock frequency, configured to receive an information signal having data indicative of said desired local clock frequency and to generate said local clock signal by: (i) generating a clock synchronization signal comprising clock and trigger signals by combining the periodic data structure with a scaling factor; (ii) generating a divided signal by dividing the reference signal; (iii) manipulating the clock synchronization signal and the divided signal according to the desired local clock frequency; (iv) generating a phase comparison signal by phase comparing the manipulated clock synchronization signal and divided signal; and (v) generating the local clock signal with a controlled oscillator clock generator of the circuitry by using the phase comparison signal to control the controlled oscillator clock generator.