Impulse frequency correction system of serial bus clock and method thereof

Abstract

The invention discloses an impulse frequency correction system of a serial bus clock and a method thereof. A first frequency regulation device, a second frequency regulation device and a third frequency regulation device share one oscillator to correct the accuracy of the multi-stage clock impulse frequency of different frequency regulation ranges, and therefore the optimal frequency accuracy can be obtained. In addition, system design is greatly simplified, and element cost is lowered.

Description

technical field [0001] The present invention relates to a serial bus clock pulse frequency calibration system and its method, in particular to a serial bus clock pulse frequency calibration system and its method, which is used for multi-stage improvement of data transmission between a serial bus host and a device. Clock Frequency Resolution (Clock Frequency Resolution). Background technique [0002] Because the existing types of consumer electronic products such as communication devices (such as mobile phones), image capture devices, storage devices, and Internet access devices are all developing towards high resolution or high image quality or high storage capacity, etc., and thus need to deal with a large number of digital content. In order to facilitate users to quickly transmit a large amount of digital content between the host (Host) and its peripheral devices (Device), most of these consumer electronic products are equipped with a relatively popular high-speed serial ...

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Problems solved by technology

Patent specification published in '154 figure 2 In the disclosed USB device, it is necessary to additionally use a frequency signal source (please refer to the reference clock pulse generation circuit 132 disclosed in FIG. The synthesizer (please refer to a phase-locked loop (PLL) 134 disclosed in FIG. 7 of the '154 patent specification) corrects its operating frequency according to the reference clock signal. However, this design is too complicated and has the problem of high component cost , and use the reference clock pulse generation circuit to generate the frequency signal source to correct its operating frequency. For USB transmission signals, there is still the problem of inaccurate frequency

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