Patent ID: 8686781

Claim:
A circuit comprising: a first node; a second node; a pull-up circuit selectively coupled to the first node or the second node, the pull up circuit comprising: a first pull-up circuit having a first pull-up transistor coupled with a first pull-up resistive device, the first pull-up transistor being coupled to a first power source configured to carry a voltage having a first voltage level; and a second pull-up circuit having a second pull-up transistor coupled with a second pull-up resistive device, the second pull-up transistor being coupled to a second power source configured to carry a voltage having a second voltage level greater than the first voltage level; a pull-down circuit selectively coupled to the other of the first node or the second node; and a resistive circuit disconnectably coupled between the first node and the second node; wherein the resistive circuit is configured to set the circuit in either a full-swing mode or in a de-emphasis mode in response to a control signal.