Patent ID: 7617347

Claim:
A data transfer control device that controls data transfer, the data transfer control device comprising: a controller that analyzes a reception packet received through a serial bus and generates a transmission packet to be transmitted through the serial bus; an interface circuit that performs interface processing between the data transfer control device and a display driver connected to the data transfer control device through an interface bus; and a signal detection circuit that, when a vertical synchronization signal used for indicating a non-display period of a display panel has been input from the display driver, detects the vertical synchronization signal and outputs a detection signal, when the controller has received a read request packet that requests reading of status of the vertical synchronization signal, the controller waiting for the detection signal to be output from the signal detection circuit, and performing processing of transmitting a response packet or an acknowledge packet of the read request packet through the serial bus on condition that the detection signal has been output from the signal detection circuit.