Seiko Epson Corporation

Yuji Mikami

Shun Oshita

Kenyou Nagao

Shuichi Yanagihara

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.

Bulk data transfer and buffer control device and electronic instrument

A data transfer control device for data transfer through a bus including a state execution circuit conducting each state process of first-Nth states in order to perform a state control of the data transfer control device, a transfer controller performing a control for the data transfer based on a result of the state process execution in the state execution circuit, a command register in which a state transition execution command is set, and a control circuit decoding the state transition execution command set in the command register and controlling the state execution circuit based on a result of the decoding, the control circuit controlling the state execution circuit to execute a Kth (1&#x2266;K&#x2266;N) state process if an individual state transition execution command that changes the state of the data transfer control device to the Kth state is set in the command register, and the control circuit controlling the state execution circuit to execute a plurality of state processes consecutively from a Lth (1&#x2266;L&#x2266;N) state to a Mth (1&#x2266;M&#x2266;N) state if a successive transition execution command is set in the command register, the successive transition execution command successively changing the state of the data transfer control device from the Lth state to the Mth state.

Growing community of inventors

Sapporo, Japan

Yuji Mikami