Signal formation device, periodic signal observation system and integrated circuit, periodic signal observation method and method of exam of integrated circuit

摘要

Through I/O in order to observe the specified periodic signal inside the LSI circuit being the signal formation device which forms the signal for plural periodic observations which is output outside the said LSI circuit inside the LSI circuit, the aforementioned periodic signal at specified dividing ratio giving specified phase difference to the signal which dividing is done in the dividing circuit and the aforementioned dividing circuit which dividing it does, it has with the delay circuit in order to obtain the plural signals where phase differs mutually.