Patent ID: 6930508

Claim:
An integrated circuit connected to a transmission line, the integrated circuit comprising: a driver including a plurality of driving units for outputting data to the transmission line and receiving data from the transmission line; and a controller for applying a plurality of control signals to the driver, the control signals being generated in response to an output activation signal and at least one impedance code signals related to states of the impedance of the transmission line, wherein at least one driving unit is driven in response to the control signals, and the driver includes an on-chip termination circuit for impedance matching external devices, wherein the driver includes a first driving unit and a second driving unit commonly connected to the transmission line, wherein the controller includes: a circuit for generating a first up driving control signal in response to the output activation signal and the output data signal; a circuit for generating a second up driving control signal in response to the output activation signal and the output data signal; a circuit for generating a first down driving control signal in response to the output activation signal and the output data signal; a circuit for generating a second down driving control signal in response to the output activation signal and the output data signal; a circuit for generating a third up driving control signal in response to the output activation signal, the output data signal and a first impedance code signal; a circuit for generating a fourth up driving control signal in response to the output activation signal, the output data signal, the first impedance code signal and a second impedance code signal; a circuit for generating a third down driving control signal in response to the output activation signal, the output data signal and the first impedance code signal; and a circuit for generating a fourth down driving control signal in response to the output activation signal, the output data signal, the first impedance code signal and the second impedance code signal.