Patent ID: 7496149
Filing Date: 2009-02-24
Classification: G06F,H04L

Abstract:
1. For use with a transmitter, a receiver, and a differential serial data link including at least two lines connecting the transmitter and receiver, a method comprising: developing a signal representative of a voltage difference between the at least two lines at the receiver; integrating the developed signal to develop an integrated signal; and signaling at least a portion of the receiver to exit a first state if the integrated signal exceeds a threshold indicating that a change in common mode voltage has occurred at the receiver, wherein developing the signal representative of the voltage difference between the at least two lines at the receiver comprises: inputting a signal representative of a voltage on a first one of the at least two lines to a first input of an operational amplifier; inputting a signal representative of a voltage on a second one of the at least two lines to a second input of an operational amplifier, and rectifying an output of the operational amplifier with a rectifier.