Patent ID: 7477704

Claim:
A method in a bus receiver for determining a digital signal state in a differential signaling system, said method comprising: comparing a first differential input signal received by the bus receiver at a current time to a second differential input signal received by the bus receiver at the current time; determining a prior digital signal output state, wherein the prior digital signal output state is determined at the time prior to the current time; determining a previous signal transmission state of differential signals from the prior digital signal output state, wherein the signal transmission state of the differential signals indicates a signal level of the first differential input signal relative to the second differential input signal to transmit a digital symbol; comparing, in the bus receiver, said first differential input signal to one of a first reference voltage and a second reference voltage based on the prior digital signal output state; comparing said second differential input signal to one of said first reference voltage and said second reference voltage; and determining a present digital signal output state of the current time from said determining said prior digital signal output state and from all of said comparings.