Signal receiving apparatus and method having channel identifying mechanism

A signal receiving method having a channel identifying mechanism used in a signal receiving apparatus, comprising:

• electrically coupling a signal receiving interface to a signal transmission line such that a plurality of signal channels comprised by the signal receiving interface perform signal receiving, each of the plurality of signal channels comprising a pair of differential signal lines;
• in a link training process, detecting a signal amount of each of the plurality of signal channels by a signal processing circuit, to determine the plurality of signal channels having the signal amount matching a first predetermined criteria to be a plurality of actual communication signal channels;
• in the link training process, detecting a plurality of test data sequences transmitted by the plurality of actual communication signal channels by the signal processing circuit to identify a polarity order of the different signal lines of each of the plurality of actual communication signal channels and a channel number order of the plurality of actual communication signal channels according to a data pattern of each of the plurality of test data sequences;
• and
• after the link training process is finished, performing actual data receiving from the signal transmission line through the plurality of actual communication signal channels according to the polarity order and the channel number order by the signal processing circuit.