Patent ID: 8330486

Claim:
A data line termination circuit comprising: a swing-width sensing unit comprising: a first comparator configured to compare a voltage of a data line with a first reference voltage; a second comparator configured to compare the voltage of the data line with a second reference voltage; a third comparator configured to compare the voltage of the data line with a third reference voltage; and an encoder configured to encode outputs of the first to third comparators in order to output a sensed signal, wherein the swing-width sensing unit is configured to compare the voltage of the data line with each of the first to third reference voltages, and configured to output the sensed signal having a first logic level if the outputs of the comparing are the same logic levels, and configured to output the sensed signal having a second logic level if the outputs of the comparing are not the same logic levels; and a variable termination unit configured to adjust a termination resistance value of the data line according to the sensed signal.