It's hard to see how this could be done, at least in a simulator that doesn't partition the design. Given that you have to solve a whole bunch of simultaneous equations, and converge on a solution - the simulation time is dependent on the whole circuit. I guess you could potentially keep track of when all the equations for a particular block have converged, and when you're tracking time, ignor eany time after that.

This would all assume that there's no interaction between the blocks - it may be that as other parts of the circuit converge on a solution, they start affecting other blocks which were previously converged, for example.

Anyway, suffice to say, there isn't a way of doing this with spectre or other simulators that I know of (perhaps it is possible with some - but I've not come across such a feature; I'm not convinced it would be terribly useful).

Regards,

Andrew (first post after a long absence!)

I would assume you would know that information from simulating the blocks individually as you design them - but I get your point.

Regards,

Andrew.