Communication system between dies and operation method thereof

An operation method of a communication system, comprising:

• calculating, by a transmitting device, transmitted data verification information of a current data unit in a plurality of data units;
• transmitting, by the transmitting device, the current data unit and the transmitted data verification information to a communication interface, and recording the current data unit in an FIFO buffer;
• receiving, by a receiving device, the current data unit and the transmitted data verification information from the communication interface;
• calculating, by the receiving device, a received data identification value by itself based on the current data unit received from the communication interface;
• using, by the receiving device, the transmitted data verification information received from the communication interface and the received data identification value to check whether the current data unit received from the communication interface is in error;
• returning, by the receiving device, an error flag to the transmitting device when the current data unit received from the communication interface is in error;
• suspending, by the transmitting device, transmission of a new data unit based on the error flag, and transmitting at least one buffered data unit recorded in the FIFO buffer to the receiving device through the communication interface,
• calculating, by the transmitting device itself, a current transmitted data identification value based on the current data unit;
• using, by the transmitting device, the current transmitted data identification value to calculate the transmitted data verification information of the current data unit;
• and
• recording, by the transmitting device, the current transmitted data identification value in the FIFO buffer,
• wherein the received data identification value is an identification code of the current data unit.