BUS CONTROLLER, BUS COMMUNICATION SYSTEM, AND BUS CONTROL METHOD

摘要

An object of the invention is to avoid a state in which a retry response is always received from a target by preventing a command issuance period from being constant by disordering the timings of command issuance requests (namely, request signals) from initiators even when the initiators send the command issuance requests (namely, transmission of request signals) at the same time or alternately. A bus control unit (120) allows an initiator (102) to use a bus (104) by transmitting a permission signal to the initiator (102) which transmits a request signal according to a predetermined priority order. A mask generation unit (110) transmits a mask signal to at least one initiator (102) and allows the initiator (102) to mask the request signal. The bus control unit (120) performs a control so that the timing at which the initiator (102) is allowed to use the bus (104) is made asynchronous.