SIGNAL TRANSMISSION CIRCUIT, SEMICONDUCTOR DEVICE CONTAINING THE SIGNAL TRANSMISSION CIRCUIT, METHOD FOR DESIGNING THE SEMICONDUCTOR CIRCUIT DEVICE, AND CAD DEVICE FOR REALIZING THE DESIGN METHOD

摘要

[PROBLEMS] To provide a semiconductor circuit device in which soft error resistance is enhanced while assuring the high-speed operation of an entire LSI circuit. [MEANS FOR SOLVING THE PROBLEMS] A CAD device includes: means for identifying a signal transmission time of each signal transmission circuit of the LSI circuit; means for identifying an output inversion ratio upon radiation exposure of a flip-flop circuit of each signal transmission circuit; means for identifying a signal transmission circuit as a critical path; means for calculating a soft error ratio of the entire LSI circuit according to the signal transmission time, the output inversion ratio, and the clock cycle; and means for lowing the soft error ratio of the entire LSI circuit without changing the signal transmission time of the signal transmission circuit as the critical path when a predetermined soft error ratio is lower than the soft error ratio of the entire LSI circuit.