Abstract: An integrated circuit device includes: a plurality of I/O cells coupled to an external apparatus; a control signal generator configured to detect a phase relationship among data signals respectively input into the plurality of I/O cells and to generate control signals based on the phase relationship; and a drive controller circuit configured to control the driving of the I/O cells in response to the control signals.

Abstract: An integrated circuit device includes: a plurality of I/O cells coupled to an external apparatus; a control signal generator configured to detect a phase relationship among data signals respectively input into the plurality of I/O cells and to generate control signals based on the phase relationship; and a drive controller circuit configured to control the driving of the I/O cells in response to the control signals.

Abstract: In view of accurately determine a valid range of data to be synchronized to the system clock, conforming to actual environments of mounting and connection, the semiconductor device of the present invention is configured as acquiring flight times of clock signal(s) and a data strobe signal, transmitted to or from a double-data-rate memory, making use of reflected waves on transmission path, and as determining a valid range of data to be synchronized with a system clock based on thus-acquired flight times of the clock signal(s) and the data strobe signal.

Abstract: The clock signal control method in the common clock system according to the present invention is used for controlling an output clock signal output externally from the integrated circuit device via the common clock system. According to the control method, a shift circuit for shifting the voltage level of the output clock signal output externally is provided, and the output clock signal output externally is controlled by shifting the voltage level using the shift circuit. It is possible, as a result, to securely output a clock signal with the proper waveform externally.

Abstract: In view of accurately determine a valid range of data to be synchronized to the system clock, conforming to actual environments of mounting and connection, the semiconductor device of the present invention is configured as acquiring flight times of clock signal(s) and a data strobe signal, transmitted to or from a double-data-rate memory, making use of reflected waves on transmission path, and as determining a valid range of data to be synchronized with a system clock based on thus-acquired flight times of the clock signal(s) and the data strobe signal.