BRIDGE DEVICE

PROBLEM TO BE SOLVED: To provide a bridge device capable of suppressing overhead at the time of data transfer even when a target side bus is not in a free state and improving bus application efficiency and burst transfer length. SOLUTION: The bridge device 100 is provided with data buses 110, 120 for temporarily storing transfer data, control parts 130, 140 for controlling the transmission/reception of data related to the data buses 110, 120, latency timer registers 150, 151 for storing maximum clock time capable of occupying each bus by one data transfer, an arbitration part 180 for arbitrating the using right of a transfer source bus, and a prediction part 160 consisting of a counter 161 for counting the number of clocks up to timing that the transferred bus becomes in a free state, a regulated value register 162 for storing a regulated value indicating the buffer capacity of the data buses 110, 120, a comparing part 163 for comparing the value of the counter 161 with the regulated value, and a bus state detection part 164 for monitoring whether the transferred bus is in a free state or not.