How to calculate Delay in Cadence using the calculator

[rajrevanth61]

Hello Everyone,

I have a OR gate for which i want to measure average and worst case delay using cadence calculator. How do i do this .
I know the procedure if there is one input and one output as in the inverter

But in my case there are two inputs and one output. How can i measure delay now? Cadence calculator shows only two signals for selection.


Please help me

Thanks.

 

[BigBoss]

You can check this graphically by drawing all signals and putting delta markers..
In additionalto, the delay may not be same for all signal levels so you should define a reference point-for instance- 50% of the rising edge.
That's why graphical examination is better..

 

[rajrevanth61]

Hello Sir,

Thanks for the reply.
If there are two signals then i have placed markers on two signals and calculate the delay by measuring the difference. But in this case there are three signals(2 input , 1 output). So On what combination(00-0, 01-1, 10-1,11-1) should I calculate the delay?

Please help me

Thank You