Calibration method and device for system clock of USB equipment
A system clock and system clock frequency technology, applied in the USB field, can solve problems such as large USB devices, no system clock calibration, and failure to use normally, and achieve the effect of reducing costs
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[0050] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0051] Take the USB Key in the USB device as an example. The USB Key is a hardware device with a USB interface, which belongs to the slave device, and performs data interaction with the PC through the USB interface. The USB Key has a built-in single-chip microcomputer or smart card chip, has a certain storage space, can store the user's private key and digital certificate, and uses the built-in public key algorithm of the USB Key to realize the authentication of the user's identity. The USB bus interface is implemented by a chip with a USB module. Usually, the clock of the USB hardware engine module is 48Mhz, and the allowable range of the clock deviation of the USB h...
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