Patent ID: 7206981

Claim:
A chip comprising: transmitters; local receivers; nodes coupled to the transmitters and resistive structures coupled between the nodes and at least one variable voltage source, and change detection circuitry to detect changes in voltages of the nodes following a change in voltage of the at least one variable voltage sources, and to determine whether the changes in voltages in the nodes are consistent with the transmitters being coupled through interconnects to the remote receivers; and control circuitry to determine whether the transmitters are coupled to remote receivers in a remote chip through interconnects, wherein the control circuitry detects the coupling with the assistance of the change detection circuitry, and further wherein if the control circuitry determines that the transmitters are coupled to the remote receivers through the interconnects and that the local receivers do not receive a response signal from the remote chip within a first length of time immediately following the determination of coupling, then the control circuitry causes at least some of the transmitters to transmit a compliance test pattern.