Timing lock identification method for timing recovery and signal receiving circuit

A signal receiving circuit, comprising:

• a receiving circuit receiving an input signal;
• a timing recovery circuit connected to the receiving circuit and generating one or more first phase adjustment pulses and one or more second phase adjustment pulses according to the input signal;
• and
• an oscillator, connected to the receiving circuit and the timing recovery circuit, generating an output signal, and increasing a phase of the output signal according to the one or more first phase adjustment pulses or decreasing the phase of the output signal according to the one or more second phase adjustment pulses,
• wherein the timing recovery circuit determines whether a locking state of timing recovery is reached or not based on a difference value between the number of the one or more first phase adjustment pulses in a detection window and the number of the second phase adjustment pulses in the detection window, wherein
• if the difference value is not greater than a threshold value, the timing recovery circuit determines that the locking state of timing recovery is reached;
• and
• if the difference value is greater than the threshold value, the timing recovery circuit determines that the locking state of timing recovery is not reached.