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Signal assignment statement
The signal assignment statement is used to modify the projected waveform
of a given signal. The syntax is:
The operation of the signal assignment statement is described in the
section on concurrent statements. Note, though, that while the signal
assignment can occur as a sequential statement, if a value is assigned to
a signal in a sequential process, then that signal will not have that
value when the next statement is executed. This is due to the fact
that the signal assignment does not modify the value of the signal
directly, but modifies the projected waveform of that signal. Waveforms
are described in the next section.