Patent ID: 6266798
Filing Date: 2001-07-24
Classification: G06F

Abstract:
A system for evaluating a multi power supply integrated circuit which has at least one primary input terminal and at least one primary output terminal and consists of a plurality of cells in combination, comprising:(a) means for inputting a database, in which a plurality of first cells each of which has at least one input node and at least one output node and is driven by a first power supply voltage, a plurality of second cells each of which has at least one input node and at least one output node and is driven by a second power supply voltage lower than the first power supply voltage, a plurality of third cells each of which has at least one input node and at least one output node and converts signals at the second power supply voltage level into the signals at the first power supply voltage level, and a plurality of fourth cells each of which has at least one input node and at least one output node and has a function for converting signals at the second power supply voltage level into the signals at the first power supply voltage level therein are registered, and connection descriptions between the cells constituting the multi power supply integrated circuit, between the cells and the primary input terminal, and between the cells and the primary output terminal;(b) means for detecting a first connection between the output node of the second cell and the input node of the first cell and a second connection between the output node of the second cell and the primary output terminal, by using the database and the connection descriptions;(c) means for registering the first connection and the second connection being detected as power supply voltage illegal connections; and(d) means for outputting registered power supply voltage illegal connections.