| 主权项 |
1. A data receiving device for identifying a transmission mode of a data signal, comprising:
a clock generating circuit for generating a first reference clock according to a source clock; a phase detector for generating a phase detection signal according to the data signal and a data recovery clock; a phase adjusting circuit, coupled to the clock generating circuit and the phase detector, for adjusting a phase of the first reference clock according to the phase detection signal to generate the data recovery clock and outputting the data recovery clock to the phase detector and generating a second reference clock according to the phase detection signal and the first reference clock, the second reference clock and the data recovery clock having the same frequency and a phase difference; a mode detector, coupled to the phase adjusting circuit, for detecting the transmission mode according to the second reference clock and the data signal and generating a mode signal accordingly; and a control circuit, coupled to the mode detector and the clock generating circuit, for determining whether to control the clock generating circuit to change the frequency of the first reference clock or not according to the mode signal. |
