Patent ID: 8196077
Filing Date: 2012-06-05
Classification: G06F

Abstract:
1. A cell-library-for-statistical-timing-analysis creating apparatus, comprising: a group determining unit that groups cells as statistical timing analysis targets into groups of cells each having same topology; a representative-cell selecting unit that selects representative cells from the respective grouped cell groups; a signal-transition-time-information determining unit that sets one or more kinds of signal transition time information based on output signal transition time as transition time of an output signal from a cell and input signal transition time as transition time of an input signal to the cell; an output-load-capacitance/input-signal-transition-time determining unit that calculates, based on the set signal transition time information and a cell library for static timing analysis, for each of the selected representative cells, an output load capacitance and input signal transition time for each of the set kinds of signal transition time information to be used for circuit simulation; a circuit-simulation executing unit that executes the circuit simulation using the calculated output load capacitance and input signal transition time and calculates a delay variation amount; a delay-variation-information calculating unit that calculates delay variation information based on a delay average and the delay variation amount calculated by the circuit simulation; and a library output unit that outputs, as a cell library for statistical timing analysis, association for each of the representative cells between the signal transition time information and the delay variation information.