BUS CONTROL CIRCUIT, INFORMATION PROCESSOR, AND COMMON BUS COLLISION AVOIDANCE METHOD

摘要

PROBLEM TO BE SOLVED: To prevent an abnormality of one of a plurality of control circuits from causing a situation in which a normal control circuit cannot use a common bus.SOLUTION: The bus control circuit 1 includes an abnormality detection circuit 2 and an adjusting circuit 3. The abnormality detection circuit 2 detects the abnormality of bus control signals S1 and S2 for reporting whether control circuits 5 and 6 demand the use of a common bus 7. The adjusting circuit 3 includes a logic circuit for creating a signal for controlling the flow of data D1 and D2 from respective control circuits 5 and 6 to the common bus 7 on the basis of the bus control signals S1 and S2 output from respective control circuits 5 and 6, presence/absence of abnormality detection by the abnormality detection circuit 2, and a previously determined priority of use of the common bus 7.