Patent ID: 8854050
Filing Date: 2014-10-07
Classification: H04L

Abstract:
1. A detection method of low frequency handshaking signal which is suitable for a detection system, wherein the detection system comprises a host device having a first receiver and a first transmitter, and a controlled device having a second receiver, a second transmitter and a clock/data recovery device, the detection method comprising the steps of: (a) performing a first impedance calibration when the host device is activated for sending a first low frequency signal based on the first impedance calibration and performing a second impedance calibration when the controlled device is activated for sending a second low frequency signal based on the second impedance calibration; (b) transmitting a first high frequency training signal from the host device to the second receiver of the controlled device when the first low frequency signal and the second low frequency signal are in a predetermined condition; and (c) transmitting a second high frequency training signal from the controlled device to the first receiver of the host device wherein the frequency of the first low frequency signal and the second low frequency signal is smaller than the frequency of the first high frequency training signal and the second high frequency training signal.