In a data/strobe encoding scheme circuit in which data and a strobe signal are transmitted through different lines, changes respectively in the data and the strobe signal are employed as clock signals for a latching operation, and the data is transmitted to a succeeding-stage circuit operating on a second clock signal. The circuit latches predetermined data by an FF circuit and passes a data pair including a signal indicating that the data has been latched and held therein as well as the latched data to the succeeding-stage circuit, activates, if assertion of a signal indicating reception of the data is received from the succeeding-stage circuit, again the FF circuit which has latched the data and has entered a stop state, and receives new data. There is provided a data/strobe encoding scheme circuit and a data/strobe encoding method, it is possible to implement a data/strobe encoding scheme circuit and a data/strobe encoding method capable of realizing a low-cost data/strobe encoding scheme which is independent of LSI device characteristics and which can be easily designed.