AUTOMATIC PIN ALLOCATING METHOD OF LARGE SCALE INTEGRATED CIRCUIT

PURPOSE:To provide an automatic pin allocating method which can evade a simultaneous switching noise without fail at an automatic mounting design step concerning the automatic pin allocating method of LSI. CONSTITUTION:A first step S1 to allocate a pin so that the wiring in an LSI can be the shortest, a second step S2 to calculate the delay time of an electric signal concerning all channels between an FF in the LSI and an output pin, and a third step S3 to re-allocate the output pin are included when the output pin with the possibility to cause the simultaneous switching becomes obvious by the second step S2 and such an output pin is allocated at the adjacent position by the first step S1.