Abstract: A serial transmission apparatus, which transmits data through a serial communication line, includes a transmission unit configured to transmit data stored in a transmission data buffer to a transmission destination apparatus, a time-out detector configured to detect a time out when a response to the transmitted data from the transmission destination apparatus is not received within a specified period of time, a recovery state detector configured to detect a recovery state representing that the serial communication line is in a link recovery process, and a retransmission request unit configured to request the transmission unit to transmit again the data which has been stored in the transmission data buffer when the time-out detector detects the time-out or when the recovery state detector detects the recovery state of the serial communication line.

Abstract: A transmission device includes a plurality of memory units storing requests for processing information stored in a memory. Moreover, when a request from a first device is received, the transmission device analyzes the received request to specify an address range including a memory address storing data to be subjected to the requested processing. The transmission device stores requests in different memory units for each address range. Moreover, the transmission device determines for each memory unit whether the stored requests are being executed by a second device. The transmission device transmits a request which is stored in a memory unit and which is determined to be not being executed, to the second device.

Abstract: A serial transmission apparatus, which transmits data through a serial communication line, includes a transmission unit configured to transmit data stored in a transmission data buffer to a transmission destination apparatus, a time-out detector configured to detect a time out when a response to the transmitted data from the transmission destination apparatus is not received within a specified period of time, a recovery state detector configured to detect a recovery state representing that the serial communication line is in a link recovery process, and a retransmission request unit configured to request the transmission unit to transmit again the data which has been stored in the transmission data buffer when the time-out detector detects the time-out or when the recovery state detector detects the recovery state of the serial communication line.