Patent ID: 8521943

Claim:
A data transmission system comprising: a multipart switch; and a first device and a second device each connected to a port of said multiport switch through one or more serial buses, said multiport switch including buffer, and a priority control unit, when said buffer includes a write packet and a read packet which are transferred to an identical transfer destination and transferred from an identical transfer source, providing an output of the write packet by priority, said first device and said second device each including a memory, an output unit providing an output of a generated packet to said multipart switch, a receiving unit receiving the packet from said multipart switch, and a write processing unit writing data included in a payload of said received write packet into an address of the memory designated in a write address included in the received write packet, said first device including a read request unit generating a read requesting write packet including a predetermined address of the memory of said second device as a write address and including a read address of the memory of said second device in the payload, and said second device including a read response unit detecting reception of a read request when the data is written into the predetermined address of said memory, reading the data from the read address of the memory written into said predetermined address, and generating a read responding write packet including, in the payload, said data that has been read.