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Cadence simulation spectre/ultrasim too slow

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Vlad Cretu

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Hello,

I have a not so big circuit to simulate. It's digital and it is composed of 40 counters of 14 bit plus some logic. The simulation in spectre is taking 1 year. In ultrasim extended 1 day, but the data is messed up because of the resolution of the simulation. I am really blocked, because I have to simulate 230s and i cannot manage to test the circuit.

Any ideas would be great.

Thank you.
 

40 x 14-bit counters makes 560 bits.
2 to that power generates a number so large that my scientific calculator simply displays 'E'. No wonder the simulations need to run for such a long time.

Instead, try starting with one or two IC's. See if the simulation works okay.

Then add IC's, one at a time.
 

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