ADAPTER FOR BUS SWITCH, BRIDGE FOR BUS SWITCH, BUS SWITCH, AND BUS SWITCH SYSTEM

PROBLEM TO BE SOLVED: To provide an adapter for a bus switch, a bridge for the bus switch, the bus switch, and a bus switch system which can increase a data transfer amount per unit time by increasing the transfer bandwidth of each module (I/O port). SOLUTION: In a ring-shaped bus 11, adapters 12a to 12c equipped with input registers 101a to 101c and 103a to 103c on input sides and output sides are interposed, and I/O ports 14a to 14c are connected to the adapters 12a to 12c. Further, a bridge 13 equipped with input registers 201a and 203a on its input and output sides is provided at the coupling part between the bus 11 and bus 30. The adapters 12a to 12c control data transfer between the bus 11 and I/O ports 14a to 14c and the bridge 13 controls data transfer between the buses.