Patent ID: 6906550

Claim:
A terminator circuit for terminating an electrical connection, the terminator circuit comprising: at least one pull-up circuit connected between a higher-voltage supply rail and the electrical connection, wherein the at least one pull-up circuit turns on in response to a voltage at the electrical connection dropping below a lower threshold value; at least one pull-down circuit connected between the electrical connection and a lower-voltage supply rail, wherein the at least one pull-down circuit turns on in response to the voltage at the electrical connection exceeding an upper threshold value; biasing circuitry connected to the at least one pull-up circuit and the at least one pull-down circuit, wherein the biasing circuitry generates bias signals that determine the lower threshold value and the upper threshold value, and wherein the lower threshold value dis selected fro a first plurlity of voltage values and the upper threshold value is selected from a second plurality of voltage values; and logic circuitry connected to the biasing circuitry, wherein the logic circuitry receives as an input a designation of a mode for the terminator circuit selected from a plurality of modes, and wherein the plurality of modes comprises at least three modes, and wherein the logic circuitry directs the biasing circuitry to produce bias signals that correspond to the mode designated by the input to the logic circuitry.