Detection system for vehicle-mounted ethernet link synchronization signal

A detection system for vehicle-mounted Ethernet link synchronization signal, suitable for a vehicle-mounted Ethernet device to determine synchronization signal sent by an external device, comprising:

• one or more processors coupled to one or more memory devices;
• a signal characteristic judgment module, the signal characteristic judgment module generates a synchronization mode identifier according to the signal characteristic of the synchronization signal;
• a rate judgment module, the rate judgment module generates a working rate identifier according to the synchronization signal;
• a synchronization module, wherein the synchronization module is respectively connected with the signal characteristic judgment module and the rate judgment module, and the synchronization module generates synchronization information for handshake between the vehicle-mounted Ethernet device and the external device according to the synchronization mode identifier and the working rate identifier and outputs the synchronization information;
• the synchronization mode identifier comprises a continuous signal and a pulse signal;
• the rate judgment module further comprises a continuous signal detection module, and the continuous signal detection module is connected to the signal characteristic judgment module;
• when the synchronization mode identifier indicates as the continuous signal, the continuous signal detection module directly outputs a pre-configured continuous signal pattern rate, which functions as the working rate identifier, to the synchronization module;
• wherein the signal characteristic judgment module comprises:
• a timing module, the timing module generates a clock signal;
• a counting module, the counting module is connected to the timing module and generates periodic counting results based on the input clock signal and synchronization signal to function as the signal characteristic;
• and
• a judgment module, the judgment module generates the synchronization mode identifier based on the signal characteristic;
• wherein the rate judgment module comprises:
• a sampling module, the sampling module samples the synchronization signal to form a sampling data;
• a decision module, the decision module generates a PN sequence based on the sampling data;
• and
• a detection module, the detection module is connected to the decision module and generates the working rate identifier based on the PN sequence.