Patent attributes
A data transfer control device for transferring data via a bus includes a buffer controller for controlling access to a data buffer in which a command block area, a data area and status block area are prepared, and a transfer controller for controlling data transfer. The transfer controller executes, a transaction of bulk OUT transfer in a command transport to automatically send a packet including command block data written in the command block area in response to an instruction to execute automatic bulk transfer, a transaction of one of bulk OUT transfer and bulk IN transfer in a data transport to automatically execute one of sending a packet including sending data written in the data area and receiving a packet including receiving data to be written in the data area, and a transaction of bulk IN transfer in a status transport to automatically receive a packet including status block data to be written in the status block area.
