Jess Chen
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Try
V = -3.4545*$abstime + Vdd.
If you want incremental time, you can use
t = idt(1,0,assrt).
When assrt is nonzero, t remains at zero. When assrt is zero, t = incremental time. The only caution is that depending on the application, you may have to use conservative numerical options.
-Jess
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