Master/slave decision device and master/slave decision method applied to network device

A master/slave decision device applied to a first network device, wherein the first network device is coupled to a second network device, and the master/slave decision device comprises:

• a seed distance detecting unit, for detecting a seed distance between a first seed utilized in a first scrambler of the first network device and a second seed utilized in a second scrambler of the second network device;
• and
• a decision unit, coupled to the seed distance detecting unit, for determining the first network device to be a master device or a slave device according to the seed distance;
• wherein when the decision unit determines the first network device to be the master device, the first network device utilizes a first clock to transmit data;
• and when the decision unit determines the first network device to be the slave device, the first network device utilizes a second clock to transmit data, where the second clock is different from the first clock;
• wherein the first clock is a local clock of the first network device, and the second clock is a recovery clock which is generated by performing a timing recovery operation upon a received data by the first network device;
• and
• wherein the decision unit determines if resetting the first network device to be the slave device according to a frequency difference between the first clock and the second clock.