Connecting interface unit and memory storage device

A memory storage device, comprising:

• a connecting interface unit configured to be coupled to a host system;
• a rewritable non-volatile memory module comprising a plurality of physical erasing units;
• and
• a memory controller coupled to the connecting interface unit and the rewritable non-volatile memory module,
• wherein the connecting interface unit does not comprise a crystal oscillator, and the connecting interface unit comprises:
• a frequency detector configured to receive an input signal from the host system, and to detect a frequency difference between the input signal and a first reference signal to generate a first frequency signal;
• a phase detector configured to receive the input signal from the host system, and to detect a phase difference between the input signal and the first reference signal to generate a first phase signal;
• at least one filter configured to filter the first frequency signal to generate a second frequency signal, and to filter the first phase signal to generate a second phase signal;
• an oscillator coupled to the at least one filter, the frequency detector and the phase detector, and configured to oscillate according to the second frequency signal and the second phase signal to generate the first reference signal, wherein the first reference signal is for generating a clock signal;
• a first sampling circuit coupled to the oscillator and configured to generate an input data signal according to the first reference signal;
• a transmitter circuit, not receiving a reference clock from a crystal oscillator, configured to modulate an output data signal according to the clock signal to generate an output signal, and to transmit the output signal to the host system;
• and
• a storage unit coupled to the at least one filter and the oscillator, and configured to store an oscillation information of the second frequency signal or the second phase signal if an amplitude of the input signal conforms to a threshold condition,
• wherein the storage unit is configured to provide the oscillation information to the oscillator if the amplitude of the input signal does not conform to the threshold condition, and the oscillator is configured to oscillate according to the oscillation information to generate the first reference signal.