Pipeline processing communicating adjacent stages and controls to prevent the address information from being overwritten

摘要

A bus apparatus for transferring information between a bus master and a bus slave includes a plurality of pipeline registers capable of transmitting information from the bus master to the bus slave by a pipeline processing; and a plurality of management devices that manage each pipeline register. Also, the management device includes: a holding state keeping unit that keeps a holding state as information indicating whether a current stage's pipeline register corresponding to the management device holds information; an adjacent stage's holding state specifying unit that specifies the holding state of a previous stage's pipeline register that transmits information to the current stage's pipeline register and the holding state of a subsequent stage's pipeline register to which information from the current stage's pipeline register is transmitted; and a transfer control unit that determines whether information held by the corresponding pipeline register is transferred.