Physical Type Range
See http://www.eda-twiki.org/cgi-bin/view.cgi/P1076/PhysicalTypeRange.
Require that user-defined physical types can cover the same range as time.
See http://www.eda-twiki.org/cgi-bin/view.cgi/P1076/PhysicalTypeRange.
Require that user-defined physical types can cover the same range as time.