Retiming circuit module, signal transmission system and signal transmission method

A signal transmission system, comprising:

• an upstream device;
• a downstream device;
• and
• a retiming circuit module, coupled between the upstream device and the downstream device to perform signal transmission between the upstream device and the downstream device,
• wherein the retiming circuit module comprises a plurality of parallel signal transmission paths,
• the retiming circuit module is configured to perform the signal transmission between the upstream device and the downstream device based on a first parallel signal transmission path among the plurality of parallel signal transmission paths during a period of a handshake operation performed between the upstream device and the downstream device, and
• the retiming circuit module is further configured to perform the signal transmission between the upstream device and the downstream device based on a second parallel signal transmission path among the plurality of parallel signal transmission paths after the handshake operation is finished,
• wherein the retiming circuit module comprises:
• a path control circuit;
• a multipath signal transmission circuit, coupled to the path control circuit;
• a signal receiving circuit, coupled to the multipath signal transmission circuit;
• and
• a signal output circuit, coupled to the multipath signal transmission circuit,
• wherein the multipath signal transmission circuit comprises the plurality of parallel signal transmission paths,
• the signal receiving circuit is configured to receive a first signal and output a second signal,
• the path control circuit is configured to turn on one of the plurality of parallel signal transmission paths as a target parallel signal transmission path,
• the multipath signal transmission circuit is further configured to receive the second signal from the signal receiving circuit and output a third signal based on the target parallel signal transmission path, and
• the signal output circuit is further configured to receive the third signal from the multipath signal transmission circuit and output a fourth signal.

A signal transmission method, adapted to a retiming circuit module, the signal transmission method comprising:

• performing signal transmission between an upstream device and a downstream device based on a first parallel signal transmission path among a plurality of parallel signal transmission paths of the retiming circuit module during a period of a handshake operation performed between the upstream device and the downstream device;
• and
• performing the signal transmission between the upstream device and the downstream device based on a second parallel signal transmission path among the plurality of parallel signal transmission paths after the handshake operation is finished,
• wherein the retiming circuit module comprises:
• a path control circuit;
• and
• a multipath signal transmission circuit, coupled to the path control circuit,
• a signal receiving circuit, coupled to a multipath signal transmission circuit;
• and
• a signal output circuit, coupled to the multipath signal transmission circuit,
• wherein the signal receiving circuit is configured to receive a first signal and output a second signal,
• the path control circuit is further configured to turn on one of the plurality of parallel signal transmission paths as a target parallel signal transmission path,
• the multipath signal transmission circuit is further configured to receive the second signal from the signal receiving circuit and output a third signal based on the target parallel signal transmission path, and
• the signal output circuit is further configured to receive the third signal from the multipath signal transmission circuit and output a fourth signal.