TECHNICAL FIELD

The disclosure relates to a transmission device that transmits a signal, a transmission method used in such a transmission device, and a communication system including such a transmission device.

BACKGROUND ART

In association with high functionality and multi-functionality of electronic apparatuses in recent years, the electronic apparatuses are mounted with various devices such as a semiconductor chip, a sensor, and a display device. A lot of pieces of data are exchanged between these devices, and the amount of such data has been increased with high functionality and multi-functionality of the electronic apparatuses. Accordingly, the data are often exchanged with use of a high-speed interface. The high-speed interface is able to transmit and receive data at several Gbps, for example.

There have been disclosed various techniques in order to improve communication performance at a high-speed interface. For example, PTL1 and PTL2 each disclose a communication system that transmits three differential signals by using three transmission paths. Further, PTL 3 discloses a communication system that performs pre-emphasis.

CITATION LIST

Patent Literature

PTL1: Japanese Unexamined Patent Application Publication No. H06-261092PTL2: U.S. Pat. No. 8,064,535PTL3: Japanese Unexamined Patent Application Publication No. 2011-142382

SUMMARY OF THE INVENTION

As described, it is desired to improve communication performance, and further improvement of the communication performance is expected in a communication system.

It is desirable to provide a transmission device, a transmission method, and a communication system that make it possible to improve communication performance.

A transmission device according to an embodiment of the disclosure includes a driver section and a control section. The driver section is able to transmit a data signal by using three or more predetermined number of voltage states and set voltages in each of the voltage states. The control section sets an emphasis voltage that is based on a transition among the predetermined number of the voltage states, and thereby causes the driver section to perform emphasis.

A transmission method according to an embodiment of the disclosure includes transmitting a data signal by using three or more predetermined number of voltage states, and setting an emphasis voltage that is based on a transition among the predetermined number of the voltage states, and thereby performing emphasis.

A communication system according to an embodiment of the disclosure includes a transmission device and a reception device. The transmission device includes a driver section and a control section. The driver section is able to transmit a data signal by using three or more predetermined number of voltage states and set voltages in each of the voltage states. The control section sets an emphasis voltage that is based on a transition among the predetermined number of the voltage states, and thereby causes the driver section to perform emphasis.

In the transmission device, the transmission method, and the communication system according to the respective embodiments of the disclosure, the data signal is transmitted by using the three or more predetermined number of voltage states. The voltages in each of the voltage states are each settable. Further, the emphasis voltage that is based on the transition among the predetermined number of the voltage states is set, and thereby the emphasis is performed.

According to the transmission device, the transmission method, and the communication system according to the respective embodiments of the disclosure, the emphasis is performed by setting the emphasis voltage that is based on the transition among the predetermined number of the voltage states, which makes it possible to improve the communication performance. It is to be noted that the effects described here are not necessarily limitative, and may have any of the effects described in the disclosure.

