Method for error handling of an interconnection protocol, controller and storage device

A controller for use in a first device that is linkable to a second device according to an interconnection protocol, the controller comprising:

• an interface circuit, configured to implement a physical layer of the interconnection protocol so as to link to the second device;
• and
• a controller module, configured to be coupled to the interface circuit and to implement a link layer of the interconnection protocol, wherein in processing of frames from the second device received by the first device with multiple frames being allowed to be received in each clock cycle, the controller module performs a plurality of operations, the plurality of operations including:
• a) receiving a frame error position indication signal to indicate whether an error occurs in a frame in each clock cycle and a symbol position corresponding to the error, and receiving a frame correction position indication signal to indicate whether the frame in each clock cycle is correct and a symbol position corresponding to the frame that is correct;
• b) according to the frame error position indication signal and the frame correction position indication signal, and in a state of allowing Negative Acknowledgment Control (NAC) frame transmission, determining that a frame error occurs in a first clock cycle, and after requesting for NAC frame transmission, sending a request to enter into a state of disabling the NAC frame transmission;
• and
• c) after the first clock cycle, comparing the frame error position indication signal and the frame correction position indication signal, and wherein,
• when there is a correct frame and an error frame in a second clock cycle after the first clock cycle, if a value corresponding to the frame correction position indication signal is less than a value corresponding to the frame error position indication signal, then sending a request to enter into the state of allowing NAC frame transmission and the request for NAC frame transmission until the state of allowing NAC frame transmission is established.