Patent Document ID: 8050333
Application ID: 11777181
Patent Flag: 1

Claim One:
1. A data transfer device comprising: a first circuit; a second circuit; and a differential transmission line, wherein the first circuit includes a serializer to convert a parallel signal into a serial signal, a pseudo-random number generator to generate pseudo-random patterns in accordance with a predetermined algorithm, and an output buffer to selectively output the serial signal to the differential transmission line as an input signal thereto, wherein the second circuit includes a deserializer to convert the serial signal into the parallel signal, an input buffer to amplify signals inputted from the differential transmission line by a differential amplifier and to supply the signals to the deserializer and a comparator, wherein the comparator compares the pseudo-random patterns inputted from the differential transmission line with patterns generated in accordance with the predetermined algorithm to produce a comparison result thereof, and wherein a pre-emphasis amount of the output buffer and an offset amount of said differential amplifier are scanned, an output of the comparator is obtained for each combination of pre-emphasis amount of the output buffer and offset amount of said differential amplifier, and the pre-emphasis amount of the output buffer and the offset amount of said differential amplifier are determined in accordance with an amount of coincidence/non-coincidence between the pseudo-random patterns inputted from the differential transmission line and the pseudo-random patterns generated by the comparator in accordance with the predetermined algorithm.