Patent ID: 6591214
Filing Date: 2003-07-08
Classification: G06F

Abstract:
A communication interface unit for a computer, comprising:a controlling device for outputting an acknowledge signal and receiving said acknowledge signal so as to test the operation of a communication interface used for a computer, as well as controlling a plurality of I/O signals including said acknowledge signal, thereby controlling said communication interface; a separating device provided with a plurality of signal lines for transferring a plurality of I/O signals of said controlling device, a plurality of said signal lines including at least one output signal line for outputting said acknowledge signal and at least one acknowledge signal line for receiving said acknowledge signal, said separating device being used for separating each of a plurality of said signal lines into a plurality of signal line groups corresponding to a plurality of said I/O signals of said controlling device, a potential dropping device being added to each of a plurality of said acknowledge signal lines; and a plurality of relaying devices for relaying each of a plurality of said signal line groups of said separating device to an external device.