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I've always been told that a signal updates its values after a wait statement, or after a rising edge if we have for example 'if rising_edge(clk) then' You've been misinformed somewhat. In VHDL, a signal updates its value: on a wait statement (not after it) at the end of a process On a wait statement means 'upon starting the wait statement'. A process ...


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The value of 0 will exist in your count signal for an entire clock cycle. So if each value takes 1 clock cycle in the sequence: 0, 1, 2, 3, 4 That's 5 clock cycles total.


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A 'wait on' statement at the end of a process ensures that the process is carried out once at the start of simulation, before waiting for the signals it is sensitive to. Superficially, a process with a sensitivity list is equivalent to a process with a a 'wait on' statement as its final line. An important difference, though, is that a process with a ...


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