US Patent 7805549 Transfer apparatus and method

There is provided a transfer apparatus having a bridge that transfers a transaction between a first and a second bus, and a data transfer unit that performs a data transfer by DMA between the first and second bus. The transfer apparatus controls a transfer sequence of transaction transfers by the bridge and data transfers by the data transfer unit, in which transaction transfers by the bridge are based on bus sequencing rules and data transfers by the data transfer unit are based on a data transfer activation condition.