Patent ID: 6842038

Claim:
A method of switching a source terminated driver having a data input coupled to a data signal, an enable input coupled to an enable signal, and an output coupled to a proximal end of a transmission line into a high impedance state following transmission of a signal on the transmission line having a high impedance at a distal end of the transmission line comprising the steps of: switching the enable signal to a first enable level to cause the driver to drive the data input as a transmission line signal at the proximal end of the transmission line; switching the enable signal to a second enable level, suitable for switching the driver to the high impedance state, subsequent to the time the transmission line signal started; detecting when the reflection of the transmission line signal returns to the proximal end of the transmission line; and switching the driver to a high impedance state, responsive to the detection, if the enable signal has been switched to the second enable level.