Abstract: A semiconductor integrated circuit comprises an internal data bus, a first holding part for entering and holding data which are obtained from outside the semiconductor integrated circuit via the internal data bus, a reading part for reading out the data held in the first holding part and for outputting the read out data to the internal data bus, a second holding part for entering and holding the data which is read out by the reading part via the internal data bus, a third holding part for entering and holding test data which are obtained from outside the semiconductor integrated circuit bia the internal data bus, a discriminating part for comparing the data held in the second and third holding part and for obtaining a discrimination result based on whether the compared data coincide, and an output part for outputtting the discrimination result of the discrimination part of the outside of the semiconductor integrated circuit.