Apparatus for calculating delay time in logic functional blocks

Claim 1

An apparatus for calculating a delay time it takes to transmit a signal from an input portion to an output portion of a logic functional block including an MOS transistor, comprising: means for providing an arrangement and wiring result including a layout pattern ranging from said input portion to said output portion of said logic functional block; delay parameter storage means for storing at least one delay parameter which is a function of input slew rate in accordance with various logic functional blocks; an RC lumped constant calculator for calculating an RC lumped constant of an output-side wiring portion of said logic functional block as a function of said arrangement and wiring result; delay parameter determination means for receiving a delay parameter in accordance with said logic functional block as a selected delay parameter from said delay parameter storage means and determining an input slew rate of said logic functional block as a function of said arrangement and wiring result to output an value of said selected delay parameter determined by said input slew rate as a selected delay parameter determined value; output impedance calculation means for calculating an output impedance of said logic functional block from a predetermined output impedance calculation equation as a function of a capacitance of said RC lumped constant and said selected delay parameter determined value; and delay time calculation means for calculating said delay time from a predetermined delay time calculation equation as a function of said RC lumped constant and said output impedance.

Claim 2

An apparatus for calculating a delay time it takes to transmit a signal from an input portion to an output portion of a logic functional block including an MOS transistor, comprising: means for providing an arrangement and wiring result including a layout pattern ranging from said input portion to said output portion of said logic functional block; delay parameter storage means for storing at least one delay parameter which is a function of input slew rate in accordance with various logic functional blocks; an RC lumped constant calculator for calculating an RC lumped constant of an output-side wiring portion of said logic functional block as a function of said arrangement and wiring result; delay parameter determination means for receiving a delay parameter in accordance with said logic functional block as a selected delay parameter from said delay parameter storage means and determining an input slew rate of said logic functional block as a function of said arrangement and wiring result to output an value of said selected delay parameter determined by said input slew rate as a selected delay parameter determined value; output impedance calculation means for calculating an output impedance of said logic functional block from a predetermined output impedance calculation equation as a function of a capacitance of said RC lumped constant and said selected delay parameter determined value; and delay time calculation means for calculating said delay time from a predetermined delay time calculation equation as a function of said RC lumped constant and said output impedance.