Multi-chip system and data transmission method thereof

A multi-chip system, comprising:

• a first chip, comprising:
• a plurality of transmitter (TX) channels, configured to provide at least one transaction information;
• and
• a first data processing circuit, coupled to the plurality of TX channels to receive the at least one transaction information, wherein the first data processing circuit is configured to convert the at least one transaction information into at least one first data packet according to a general packet format, and pack the at least one first data packet according to a specific packing format to generate a second data packet, wherein the second data packet has a fixed data length, and in response to that the second data packet still has free space after filling current transaction information into the second data packet, the first data processing circuit merges next transaction information into the free space of the second data packet;
• a link circuit, coupled to the first chip, wherein the first data processing circuit merges two sets of second data packets into a third data packet and transmits the third data packet to the link circuit;
• and
• a second chip, coupled to the link circuit;
• and configured to receive the third data packet through the link circuit,
• wherein the specific packing format comprises a plurality of data words (DWs), a plurality of data head flags corresponding to the plurality of DWs, and a plurality of data tail flags corresponding to the plurality of DWs.