INPUT AND OUTPUT APPARATUS OF DEVICE

摘要

An apparatus for inputting and outputting at the device is provided to reduce the number of channel required to the signal transmission and reception by using the full differential method when the device is operated at the normal mode and by using the pseudo differential method when the device is operated at the test mode. An apparatus for inputting and outputting at the device includes an input unit(301) and an output unit. The input unit(301) generates the non-inverted input data and the inverted input data by receiving the non-inverted data and the inverted data from each channel pair during the normal mode, wherein the first channel receives the non-inverted data and the second channel receives the inverted data. The input unit(301) generates the non-inverted input data and the inverted input data by receiving the non-inverted data and the reference voltage from each channel pair during the test mode. The output unit transmits the non-inverted output data to the first channel and transmits the inverted output data to the second channel during the normal mode. During the test mode, the output unit transmits the non-inverted data to the first channel and does not transmit the non-inverted data to the second channel.