Patent ID: 7821281
Filing Date: 2010-10-26
Classification: G01R

Abstract:
1. An IO circuit capable of testing die to die interconnection, comprising: a controlled circuit coupled between an input port and a pad connected to an die to die interconnection, the controlled circuit driving an output signal on the pad according to a signal received from the input port while testing the die to die interconnection; an input portion coupled between an output port and the pad, the input portion receiving a first signal from the pad and providing a second signal to the output port according to the first signal received from the pad, wherein the second signal is different from the first signal received from the pad; a feedback circuit, comprising an inverter, coupled between the input port and the output port, wherein while testing the die to die interconnection, the feedback circuit provides a feedback signal, with a frequency varying on different states of the die to die interconnection, to the input port according to the received signal.