Patent ID: 7826492

Claim:
A communication system carrying out an isochronous transfer, and comprising a cycle master node and nodes connected with each other through a system bus, wherein said cycle master node sets a cycle time of said isochronous transfer and transfers a cycle start packet onto said system bus for every said cycle time, and each of said nodes transfers an isochronous packet onto said system bus in response to said cycle start packet, wherein said cycle master node transfers a cycle setting packet to said nodes to set said cycle time, each of said nodes sets said cycle time when receiving said cycle setting packet and transfers a confirmation packet to said cycle master node, and said cycle master node transfers said cycle start packet onto the system bus for every said cycle time when receiving said confirmation packets from all of said nodes to which said cycle setting packet is transferred. wherein said cycle setting packet is transferred to said nodes in an asynchronous transfer, and each of said nodes transfers an acknowledgement packet to said cycle master node in the asynchronous transfer as the confirmation packet.