Patent ID: 6420913
Filing Date: 2002-07-16
Classification: H03K

Abstract:
A driver capable of launching signals into a driving end of a transmission line and of terminating signals at a receiver end of the transmission line, the driver comprising:a pull up circuit coupled to receive at least one of a plurality of control codes, the pull up circuit having a first impedance, the pull up circuit including a pull output circuit, the pull up output circuit including a parallel pull up circuit, the parallel pull up circuit and the pull up output circuit being controllable adjust the first impedance of the pull up circuit, the pull up circuit receiving an input signal and providing an output signal; a pull down circuit coupled to receive at least one of the plurality of control codes, the pull down circuit having second impedance, the pull down circuit including at least one pull down output circuit and a parallel pull down circuit coupled to the at least one pull down output circuit, the parallel pull down circuit being controllable to adjust the second impedance of the pull down circuit, the pull down circuit receiving the input signal and being coupled with the pull up circuit to provide the output signal.