Simply-realized crystal-oscillation-free circuit of USB (Universal Serial Bus) 1.1 device interface
A USB1.1, crystal oscillator technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problems of poor compatibility, increased test costs, etc., to achieve cost-saving, low-cost, high-performance effects
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[0015] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0016] See figure 1 , The crystal oscillator-free simple implementation circuit in the present invention includes: high-frequency oscillator (1), sampling clock frequency divider (2), USB1.1 data receiver (3), USB1.1 data state machine (4), USB1 .1 Built-in clock decision device (5) and Delta_Sigma frequency divider (6).
[0017] The 1A output terminal of the high-frequency oscillator (1) is connected to the 2A input terminal of the sampling clock frequency divider (2); the 2B input terminal of the sampling clock frequency divider (2) is connected to the USB1.1 mode control signal SPEED, and the The 2C output of the sampling clock divider (2) is connected to the 4A input of the USB1.1 data state machine (4) and the 5A input of the USB1.1 built-in clock decision device (5); the USB1.1 data receiver (3) The 3A input terminal is connected to th...
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