Patent ID: 6972597
Filing Date: 2005-12-06
Classification: H04L

Abstract:
1. An integrated circuit having a simultaneous bi-directional (SBD) input/output circuit, the SBD input/output circuit comprising: a driver to drive an SBD transmission line in response to a driver input signal; a receiver to compare a first voltage on the SBD transmission line to first and second reference voltages, and to output to the integrated circuit an input signal that depends upon the result of the comparison; and reference selection circuitry to control at least one of the first and second reference voltages used by the receiver in response to the driver input signal, wherein the receiver comprises first and second differential amplifiers connected to a common output node, each differential amplifier having first and second input nodes, the first input node of each differential amplifier connected to the transmission line, the second input node of the first differential amplifier connected to the first reference voltage, the second input node of the second differential amplifier connected to the second reference voltage.