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a common formalism for time representation in the
continuous and discrete simulation domains
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the introduction of the Universal_Time type,
by analogy with Universal_Integer and Universal_Real
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Universal_Time has a precision of float type
which is sufficient to image the time exactly
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there are two time variables of Universal_Time type
maintained by the simulator:
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the kernel variable Tc, that represents the running
time of the simulation, and
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Tn, that indicates the following time
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the function now is defined to return the value of
the running simulation time (Tc )
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this value is of Universal_Time type, resolved after
truncation to a nearest value of the current time
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the predefined attribute S'Last_Event,
returns an effective time value corresponding to the elapsed time
since the last event on S
Simulation cycle:
The simulation cycle has been adapted to take into
account the time used by the analog solver.
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the analog solver is activated in each simulation cycle,
just before the current time (Tc) is advanced
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the sequence of solutions to the DAEs (Analog Solution
Points -ASP) are located in suitable intervals between the the
current time (Tc) and the next event instance
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the value of a quantity received by a digital process as
well as the value of digital signal appearing in simultaneous assignments
are always correct
